Measurements of differential cross sections of Higgs boson production through gluon fusion in the H → W W ∗ → e ν μ ν final state at s = 13 …
The European Physical Journal C
Published On 2023/9/1
Higgs boson production via gluon–gluon fusion is measured in the decay channel. The dataset utilized corresponds to an integrated luminosity of 139 fb collected by the ATLAS detector from TeV proton–proton collisions delivered by the Large Hadron Collider between 2015 and 2018. Differential cross sections are measured in a fiducial phase space restricted to the production of at most one additional jet. The results are consistent with Standard Model expectations, derived using different Monte Carlo generators.
Journal
The European Physical Journal C
Published On
2023/9/1
Volume
83
Issue
9
Page
774
Authors
wang c x
City University of Hong Kong
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310
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209
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electrical engineering
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Fuquan Wang
University of Wisconsin-Madison
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294
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205
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Particle Physics
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Xiaofeng Wang
Tsinghua University
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Physics Department
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283
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185
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supernova
time-domain astronomy
AGN
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Haijun Yang
Shanghai Jiao Tong University
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Professor of Physics and Tsung-Dao Lee Institute
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276
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190
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High Energy Physics
Particle Physics
Nuclear Instruments and Methods
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Justin Albert
University of Victoria
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Associate Professor of Physics and Astronomy
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260
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Jonathan Butterworth
University College London
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Professor of Physics
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255
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155
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Mark Oreglia
University of Chicago
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Professor of Physics and Enrico Fermi Institute
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255
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particle physics
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María Teresa Dova
Universidad Nacional de La Plata
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Professor of Physics IFLP(CONICET/UNLP)
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250
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High Energy Physics
Cosmic rays
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Andreas Warburton
McGill University
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Professor of Physics
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248
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Other Articles from authors
Juan Pedro Ochoa Ricoux
University of California, Irvine
arXiv preprint arXiv:2402.05383
First measurement of the yield of He isotopes produced in liquid scintillator by cosmic-ray muons at Daya Bay
Daya Bay presents the first measurement of cosmogenic He isotope production in liquid scintillator, using an innovative method for identifying cascade decays of He and its child isotope, Li. We also measure the production yield of Li isotopes using well-established methodology. The results, in units of 10gcm, are 0.3070.042, 0.3410.040, and 0.5460.076 for He, and 6.730.73, 6.750.70, and 13.740.82 for Li at average muon energies of 63.9~GeV, 64.7~GeV, and 143.0~GeV, respectively. The measured production rate of He isotopes is more than an order of magnitude lower than any other measurement of cosmogenic isotope production. It replaces the results of previous attempts to determine the ratio of He to Li production that yielded a wide range of limits from 0 to 30\%. The results provide future liquid-scintillator-based experiments with improved ability to predict cosmogenic backgrounds.
2024/2/8
Article DetailsSascha Caron
Radboud Universiteit
Differential cross-sections for events with missing transverse momentum and jets measured with the ATLAS detector in 13 TeV proton-proton collisions
Measurements of inclusive, differential cross-sections for the production of events with missing transverse momentum in association with jets in proton-proton collisions at ~TeV are presented. The measurements are made with the ATLAS detector using an integrated luminosity of 140~fb and include measurements of dijet distributions in a region in which vector-boson fusion processes are enhanced. They are unfolded to correct for detector resolution and efficiency within the fiducial acceptance, and are designed to allow robust comparisons with a wide range of theoretical predictions. A measurement of differential cross sections for the process is made. The measurements are generally well-described by Standard Model predictions except for the dijet invariant mass distribution. Auxiliary measurements of the hadronic system recoiling against isolated leptons, and photons, are also made in the same phase space. Ratios between the measured distributions are then derived, to take advantage of cancellations in modelling effects and some of the major systematic uncertainties. These measurements are sensitive to new phenomena, and provide a mechanism to easily set constraints on phenomenological models. To illustrate the robustness of the approach, these ratios are compared with two common Dark Matter models, where the constraints derived from the measurement are comparable to those set by dedicated detector-level searches.
2024/3/19
Article DetailsAnna Mastroberardino
Università della Calabria
Determination of the relative sign of the Higgs boson couplings to and bosons using production via vector-boson fusion with the ATLAS detector
The associated production of Higgs and bosons via vector-boson fusion (VBF) is highly sensitive to the relative sign of the Higgs boson couplings to and bosons. In this Letter, two searches for this process are presented, using 140 fb of proton-proton collision data at = 13 TeV recorded by the ATLAS detector at the LHC. The first search targets scenarios with opposite-sign couplings of the and bosons to the Higgs boson, while the second targets Standard Model-like scenarios with same-sign couplings. Both analyses consider Higgs decays into a pair of -quarks and decays with an electron or muon. The opposite-sign coupling hypothesis is excluded with significance much greater than , and the observed (expected) upper limit set on the cross-section for VBF production is 9.0 (8.7) times the Standard Model value.
2024/2/7
Article DetailsEram Rizvi
Queen Mary University of London
Journal of High Energy Physics
Studies of new Higgs boson interactions through nonresonant HH production in the final state in pp collisions at = 13 TeV with the ATLAS detector
A search for nonresonant Higgs boson pair production in the final state is performed using 140 fb− 1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this final state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifier κ λ but also of the quartic HHVV (V= W, Z) coupling modifier κ 2V. No significant excess above the expected background from Standard Model processes is observed. An observed upper limit μ HH< 4.0 is set at 95% confidence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confidence intervals for the coupling modifiers are− 1.4< κ λ< 6.9 and− 0.5< κ 2V< 2.7, assuming …
2024/1
Article DetailsConstantine Papadatos
Université de Montréal
Inclusive and differential cross-section measurements of production in collisions at TeV with the ATLAS detector, including EFT and spin-correlation …
Measurements of inclusive and normalized differential cross sections of the associated production of top quark-antiquark and bottom quark-antiquark pairs, ttbb, are presented. The results are based on data from proton-proton collisions collected by the CMS detector at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb− 1. The cross sections are measured in the lepton+ jets decay channel of the top quark pair, using events containing exactly one isolated electron or muon and at least five jets. Measurements are made in four fiducial phase space regions, targeting different aspects of the ttbb process. Distributions are unfolded to the particle level through maximum likelihood fits, and compared with predictions from several event generators. The inclusive cross section measurements of this process in the fiducial phase space regions are the most precise to date. In most cases, the measured inclusive cross sections exceed the predictions with the chosen generator settings. The only exception is when using a particular choice of dynamic renormalization scale, µR= 12 ni= t, t, b, b m1/4
2023/9/25
Article DetailsAhmed Bassalat
An-Najah National University
Computing and Software for Big Science
Deep generative models for fast photon shower simulation in ATLAS
The need for large-scale production of highly accurate simulated event samples for the extensive physics programme of the ATLAS experiment at the Large Hadron Collider motivates the development of new simulation techniques. Building on the recent success of deep learning algorithms, variational autoencoders and generative adversarial networks are investigated for modelling the response of the central region of the ATLAS electromagnetic calorimeter to photons of various energies. The properties of synthesised showers are compared with showers from a full detector simulation using geant4. Both variational autoencoders and generative adversarial networks are capable of quickly simulating electromagnetic showers with correct total energies and stochasticity, though the modelling of some shower shape distributions requires more refinement. This feasibility study demonstrates the potential of using such algorithms for ATLAS fast calorimeter simulation in the future and shows a possible way to complement current simulation techniques.
2024/3/5
Article DetailsKyle Cranmer
New York University
Search for heavy resonances in final states with four leptons and missing transverse momentum or jets in collisions at TeV with the ATLAS detector
A search for a new heavy boson produced via gluon-fusion in the four-lepton channel with missing transverse momentum or jets is performed. The search uses proton-proton collision data equivalent to an integrated luminosity of 139 fb at a centre-of-mass energy of 13 TeV collected by the ATLAS detector between 2015 and 2018 at the Large Hadron Collider. This study explores the decays of heavy bosons: and , where is a CP-even boson, is a CP-odd boson, is a CP-even boson, and is considered to decay into invisible particles that are candidates for dark matter. In these processes, and . The boson associated with the heavy scalar boson decays into all decay channels of the boson. The mass range under consideration is 390-1300 (320-1300) GeV for the () boson and 220-1000 GeV for the boson. No significant deviation from the Standard Model backgrounds is observed. The results are interpreted as upper limits at a 95% confidence level on the cross-section times the branching ratio of the heavy resonances.
2024/1/11
Article DetailsJuan Pedro Ochoa Ricoux
University of California, Irvine
Computing and Software for Big Science
Deep generative models for fast photon shower simulation in ATLAS
The need for large-scale production of highly accurate simulated event samples for the extensive physics programme of the ATLAS experiment at the Large Hadron Collider motivates the development of new simulation techniques. Building on the recent success of deep learning algorithms, variational autoencoders and generative adversarial networks are investigated for modelling the response of the central region of the ATLAS electromagnetic calorimeter to photons of various energies. The properties of synthesised showers are compared with showers from a full detector simulation using geant4. Both variational autoencoders and generative adversarial networks are capable of quickly simulating electromagnetic showers with correct total energies and stochasticity, though the modelling of some shower shape distributions requires more refinement. This feasibility study demonstrates the potential of using such algorithms for ATLAS fast calorimeter simulation in the future and shows a possible way to complement current simulation techniques.
2024/3/5
Article DetailsMark Sutton
McGill University
Physics Letters B
Search for the Zγ decay mode of new high-mass resonances in pp collisions at s= 13 TeV with the ATLAS detector
This letter presents a search for narrow, high-mass resonances in the Zγ final state with the Z boson decaying into a pair of electrons or muons. The s= 13 TeV pp collision data were recorded by the ATLAS detector at the CERN Large Hadron Collider and have an integrated luminosity of 140 fb− 1. The data are found to be in agreement with the Standard Model background expectation. Upper limits are set on the resonance production cross section times the decay branching ratio into Zγ. For spin-0 resonances produced via gluon–gluon fusion, the observed limits at 95% confidence level vary between 65.5 fb and 0.6 fb, while for spin-2 resonances produced via gluon–gluon fusion (or quark–antiquark initial states) limits vary between 77.4 (76.1) fb and 0.6 (0.5) fb, for the mass range from 220 GeV to 3400 GeV.
2024/1/1
Article DetailsConstantine Papadatos
Université de Montréal
Journal of High Energy Physics
Studies of new Higgs boson interactions through nonresonant HH production in the final state in pp collisions at = 13 TeV with the ATLAS detector
A search for nonresonant Higgs boson pair production in the final state is performed using 140 fb− 1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this final state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifier κ λ but also of the quartic HHVV (V= W, Z) coupling modifier κ 2V. No significant excess above the expected background from Standard Model processes is observed. An observed upper limit μ HH< 4.0 is set at 95% confidence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confidence intervals for the coupling modifiers are− 1.4< κ λ< 6.9 and− 0.5< κ 2V< 2.7, assuming …
2024/1
Article DetailsEsteban Fullana Torregrosa
Universidad de Valencia
The European Physical Journal C
A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS …
This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum and rapidity are measured in the pole region, defined as GeV, over the range . The total uncertainty of the normalised cross-section measurements in the peak region of the …
2024/3/25
Article DetailsDag Gillberg
Carleton University
arXiv: Performance of the ATLAS forward proton Time-of-Flight detector in Run 2
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2024/2/9
Article DetailsDag Gillberg
Carleton University
Physical review letters
Evidence for the Higgs Boson Decay to a Z Boson and a Photon at the LHC
The first evidence for the Higgs boson decay to a Z boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision datasets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around 140 fb− 1 for each experiment, at a center-of-mass energy of 13 TeV. The measured signal yield is 2.2±0.7 times the standard model prediction, and agrees with the theoretical expectation within 1.9 standard deviations.
2024/1/11
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Universidad Nacional de La Plata
Search for electroweak production of supersymmetric particles in final states with two -leptons in = 13 TeV collisions with the ATLAS detector
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2024/2/7
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Università degli Studi di Genova
European Physical Journal C
Measurement of the H → γ γ and H → Z Z ∗ → 4 ℓ cross-sections in pp collisions at s = 13.6 TeV with the ATLAS detector
The inclusive Higgs boson production crosssection is measured in the di-photon and the ZZ∗→ 4l decay channels using 31.4 and 29.0 fb− 1 of pp collision data respectively, collected with the ATLAS detector at a centreof-mass energy of
2024/1/24
Article DetailsEram Rizvi
Queen Mary University of London
Search for heavy resonances in final states with four leptons and missing transverse momentum or jets in collisions at TeV with the ATLAS detector
A search for a new heavy boson produced via gluon-fusion in the four-lepton channel with missing transverse momentum or jets is performed. The search uses proton-proton collision data equivalent to an integrated luminosity of 139 fb at a centre-of-mass energy of 13 TeV collected by the ATLAS detector between 2015 and 2018 at the Large Hadron Collider. This study explores the decays of heavy bosons: and , where is a CP-even boson, is a CP-odd boson, is a CP-even boson, and is considered to decay into invisible particles that are candidates for dark matter. In these processes, and . The boson associated with the heavy scalar boson decays into all decay channels of the boson. The mass range under consideration is 390-1300 (320-1300) GeV for the () boson and 220-1000 GeV for the boson. No significant deviation from the Standard Model backgrounds is observed. The results are interpreted as upper limits at a 95% confidence level on the cross-section times the branching ratio of the heavy resonances.
2024/1/11
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University of Sharjah
A search for R-parity-violating supersymmetry in final states containing many jets in collisions at with the ATLAS detector
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2024/1/30
Article DetailsWade Cameron Fisher
Michigan State University
Precise test of lepton flavour universality in -boson decays into muons and electrons in collisions at TeV with the ATLAS detector
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2024/3/19
Article DetailsJose Carlos Costa Baptista-Silva
Universidade Federal de São Paulo
Revista Portuguesa de Cirurgia
RADIATION-INDUCED SARCOMAS: A SURGICAL CHALLENGE
Malignant peripheral nerve sheath tumors (MPNST) are uncommon, biologically challenging soft tissue sarcomas. The definitive treatment of these tumors is extremely challenging. In 50% of cases, these tumors are associated with type I neurofibromatosis, but in some cases, the cause can be previous treatment with radiotherapy. The present article pretends to report a clinical case of a radiation-induced MPNST submitted to surgical treatment.
2024/1/11
Article DetailsGregor Herten
Albert-Ludwigs-Universität Freiburg
Climbing to the Top of the ATLAS 13 TeV data
The large amount of data recorded with the ATLAS detector at the Large Hadron Collider, corresponding to 140 fb of collisions at a centre-of-mass energy of TeV, has brought our knowledge of the top quark to the next level. The measurement of the topantitop quark pair-production cross-section has reached a precision of 1.8% and the cross-section was measured differentially up to several TeV in several observables including the top-quark transverse momentum and top-quark-pair invariant mass. Single-top-quark production was studied in all production modes. Rare production processes where the top quark is associated with a vector boson, and four-top-quark production, have become accessible and precision measurements of several of these processes have reached cross-section uncertainties of around 10% or smaller. Innovative measurements of the top-quark mass and properties have also emerged, including the observation of quantum entanglement in the top-quark sector and tests of lepton-flavour universality using top-quark decays. Searches for flavour-changing neutral currents in the top-quark sector have been significantly improved, reaching branching-ratio exclusion limits ranging from to . Many of these analyses have been used to set limits on Wilson coefficients within the effective field theory framework.
2024/4/23
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Roldão da Rocha
Universidade Federal do ABC
The European Physical Journal C
Quark stars in – holographic model
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The European Physical Journal C
Measurement of the and cross-sections in pp collisions at TeV with the ATLAS detector
The inclusive Higgs boson production cross-section is measured in the di-photon and the decay channels using 31.4 and 29.0 fb of pp collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of . To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the channel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are fb, and fb, in agreement with the corresponding Standard Model predictions of fb and fb. Assuming Standard Model acceptances and branching fractions for the two channels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of pb and pb at 13.6 from the di-photon and …
2024/1/24
Article DetailsChristian Weber
Technische Universität Berlin
The European Physical Journal C
Measurement of the production cross-section of and mesons in pp collisions at TeV with the ATLAS detector
Measurements of the differential production cross-sections of prompt and non-prompt and mesons with transverse momenta between 8 and 360 GeV and rapidity in the range are reported. Furthermore, measurements of the non-prompt fractions of and , and the prompt and non-prompt -to- production ratios, are presented. The analysis is performed using 140 fb of TeV pp collision data recorded by the ATLAS detector at the LHC during the years 2015–2018.
2024/2/19
Article DetailsChristian Weber
Technische Universität Berlin
The European Physical Journal C
Search for invisible particles produced in association with single top quarks in proton-proton collisions at =13 TeV with the ATLAS detector
A search for the production of single-top-quarks in association with missing energy is performed in proton–proton collisions at a centre-of-mass energy of with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of fb. In this search, the boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin- resonance with a mass of GeV, an effective coupling strength above is excluded at 95 confidence level for the top quark and an invisible spin- state with mass between and GeV. In the case of non-resonant production, an effective …
2015/2
Article DetailsChristian Weber
Technische Universität Berlin
The European Physical Journal C
A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS …
This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum and rapidity are measured in the pole region, defined as GeV, over the range . The total uncertainty of the normalised cross-section measurements in the peak region of the …
2024/3/25
Article DetailsMartin Grunewald
University College Dublin
The European Physical Journal C
Compatibility and combination of world W-boson mass measurements
The compatibility of W-boson mass measurements performed by the ATLAS, LHCb, CDF, and D0 experiments is studied using a coherent framework with theory uncertainty correlations. The measurements are combined using a number of recent sets of parton distribution functions (PDF), and are further combined with the average value of measurements from the Large Electron–Positron collider. The considered PDF sets generally have a low compatibility with a suite of global rapidity-sensitive Drell–Yan measurements. The most compatible set is CT18 due to its larger uncertainties. A combination of all measurements yields a value of MeV with the CT18 set, but has a probability of compatibility of 0.5% and is therefore disfavoured. Combinations are performed removing each measurement individually, and a 91% probability of compatibility is obtained when the CDF measurement is removed. The …
2024/5/2
Article DetailsElham E Khoda
University of Washington
The European Physical Journal C
Measurement of the and cross-sections in pp collisions at TeV with the ATLAS detector
The inclusive Higgs boson production cross-section is measured in the di-photon and the decay channels using 31.4 and 29.0 fb of pp collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of . To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the channel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are fb, and fb, in agreement with the corresponding Standard Model predictions of fb and fb. Assuming Standard Model acceptances and branching fractions for the two channels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of pb and pb at 13.6 from the di-photon and …
2024/1/24
Article DetailsElham E Khoda
University of Washington
The European Physical Journal C
Measurement of the production cross-section of and mesons in pp collisions at TeV with the ATLAS detector
Measurements of the differential production cross-sections of prompt and non-prompt and mesons with transverse momenta between 8 and 360 GeV and rapidity in the range are reported. Furthermore, measurements of the non-prompt fractions of and , and the prompt and non-prompt -to- production ratios, are presented. The analysis is performed using 140 fb of TeV pp collision data recorded by the ATLAS detector at the LHC during the years 2015–2018.
2024/2/19
Article DetailsElham E Khoda
University of Washington
The European Physical Journal C
Search for invisible particles produced in association with single top quarks in proton-proton collisions at =13 TeV with the ATLAS detector
A search for the production of single-top-quarks in association with missing energy is performed in proton–proton collisions at a centre-of-mass energy of with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of fb. In this search, the boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin- resonance with a mass of GeV, an effective coupling strength above is excluded at 95 confidence level for the top quark and an invisible spin- state with mass between and GeV. In the case of non-resonant production, an effective …
2015/2
Article DetailsElham E Khoda
University of Washington
The European Physical Journal C
A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS …
This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum and rapidity are measured in the pole region, defined as GeV, over the range . The total uncertainty of the normalised cross-section measurements in the peak region of the …
2024/3/25
Article DetailsArindam Lala
Pontificia Universidad Católica de Valparaíso
The European Physical Journal C
Non-chaotic dynamics for Yang–Baxter deformed superstrings
We explore a novel class of Yang–Baxter deformed backgrounds (J High Energy Phys 01:056, 2021) which exhibit a non-chaotic dynamics for (super)strings propagating over it. We explicitly use the Kovacic’s algorithm in order to establish non-chaotic dynamics of string models over these deformed backgrounds. This analysis is complemented with numerical techniques whereby we probe the classical phase space of these (semi)classical strings and calculate various chaos indicators, such as, the Poincaré sections and the Lyapunov exponents. We find compatibility between the two approaches. Nevertheless, our analysis does not ensure integrability; rather, it excludes the possibility of non-integrability for the given string embeddings.
2024/3/12
Article DetailsGiuseppe Callea
University of Glasgow
The European Physical Journal C
Measurement of the and cross-sections in pp collisions at TeV with the ATLAS detector
The inclusive Higgs boson production cross-section is measured in the di-photon and the decay channels using 31.4 and 29.0 fb of pp collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of . To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the channel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are fb, and fb, in agreement with the corresponding Standard Model predictions of fb and fb. Assuming Standard Model acceptances and branching fractions for the two channels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of pb and pb at 13.6 from the di-photon and …
2024/1/24
Article DetailsGiuseppe Callea
University of Glasgow
The European Physical Journal C
Measurement of the production cross-section of and mesons in pp collisions at TeV with the ATLAS detector
Measurements of the differential production cross-sections of prompt and non-prompt and mesons with transverse momenta between 8 and 360 GeV and rapidity in the range are reported. Furthermore, measurements of the non-prompt fractions of and , and the prompt and non-prompt -to- production ratios, are presented. The analysis is performed using 140 fb of TeV pp collision data recorded by the ATLAS detector at the LHC during the years 2015–2018.
2024/2/19
Article DetailsGiuseppe Callea
University of Glasgow
The European Physical Journal C
Search for invisible particles produced in association with single top quarks in proton-proton collisions at =13 TeV with the ATLAS detector
A search for the production of single-top-quarks in association with missing energy is performed in proton–proton collisions at a centre-of-mass energy of with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of fb. In this search, the boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin- resonance with a mass of GeV, an effective coupling strength above is excluded at 95 confidence level for the top quark and an invisible spin- state with mass between and GeV. In the case of non-resonant production, an effective …
2015/2
Article DetailsGiuseppe Callea
University of Glasgow
The European Physical Journal C
A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS …
This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum and rapidity are measured in the pole region, defined as GeV, over the range . The total uncertainty of the normalised cross-section measurements in the peak region of the …
2024/3/25
Article DetailsAmitkumar Mehta
University of Alabama at Birmingham
The European Physical Journal C
Impact of beam–beam effects on absolute luminosity calibrations at the CERN Large Hadron Collider
At the Large Hadron Collider (LHC), absolute luminosity calibrations obtained by the van der Meer (vdM) method are affected by the mutual electromagnetic interaction of the two beams. The colliding bunches experience relative orbit shifts, as well as optical distortions akin to the dynamic- effect, that both depend on the transverse beam separation and must therefore be corrected for when deriving the absolute luminosity scale. In the vdM regime, the beam–beam parameter is small enough that the orbit shift can be calculated analytically. The dynamic- corrections to the luminometer calibrations, however, had until the end of Run 2 been estimated in the linear approximation only. In this report, the influence of beam–beam effects on the vdM-based luminosity scale is quantified, together with the associated systematic uncertainties, by means of simulations that fully take into account the non-linearity of the beam …
2024/1
Article DetailsIgnacio J. Araya
Universidad Arturo Prat
The European Physical Journal C
Weyl–invariant scalar–tensor gravities from purely metric theories
We describe a method to generate scalar–tensor theories with Weyl symmetry, starting from arbitrary purely metric higher derivative gravity theories. The method consists in the definition of a conformally-invariant metric, that is a rank (0, 2)-tensor constructed out of the metric tensor and the scalar field. This new object has zero conformal weight and is given by, where is the conformal dimension of the scalar. As has conformal dimension of 2, the resulting tensor is trivially a conformal invariant. Then, the generated scalar–tensor theory, which we call the Weyl uplift of the original purely metric theory, is obtained by replacing the metric by in the action that defines the original theory. This prescription allowed us to define the Weyl uplift of theories with terms of higher order in the Riemannian curvature. Furthermore, the prescription for scalar–tensor theories coming from terms that have explicit …
2024/4
Article DetailsGiorgos Anastasiou
Pontificia Universidad Católica de Valparaíso
The European Physical Journal C
Weyl–invariant scalar–tensor gravities from purely metric theories
We describe a method to generate scalar–tensor theories with Weyl symmetry, starting from arbitrary purely metric higher derivative gravity theories. The method consists in the definition of a conformally-invariant metric, that is a rank (0, 2)-tensor constructed out of the metric tensor and the scalar field. This new object has zero conformal weight and is given by, where is the conformal dimension of the scalar. As has conformal dimension of 2, the resulting tensor is trivially a conformal invariant. Then, the generated scalar–tensor theory, which we call the Weyl uplift of the original purely metric theory, is obtained by replacing the metric by in the action that defines the original theory. This prescription allowed us to define the Weyl uplift of theories with terms of higher order in the Riemannian curvature. Furthermore, the prescription for scalar–tensor theories coming from terms that have explicit …
2024/4
Article DetailsDavid W. Miller
University of Chicago
The European Physical Journal C
Measurement of the and cross-sections in pp collisions at TeV with the ATLAS detector
The inclusive Higgs boson production cross-section is measured in the di-photon and the decay channels using 31.4 and 29.0 fb of pp collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of . To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the channel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are fb, and fb, in agreement with the corresponding Standard Model predictions of fb and fb. Assuming Standard Model acceptances and branching fractions for the two channels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of pb and pb at 13.6 from the di-photon and …
2024/1/24
Article DetailsDavid W. Miller
University of Chicago
The European Physical Journal C
Measurement of the production cross-section of and mesons in pp collisions at TeV with the ATLAS detector
Measurements of the differential production cross-sections of prompt and non-prompt and mesons with transverse momenta between 8 and 360 GeV and rapidity in the range are reported. Furthermore, measurements of the non-prompt fractions of and , and the prompt and non-prompt -to- production ratios, are presented. The analysis is performed using 140 fb of TeV pp collision data recorded by the ATLAS detector at the LHC during the years 2015–2018.
2024/2/19
Article Details