Manuel Fiolhais

Universidade de Coimbra

H-index: 23

Europe-Portugal

About Manuel Fiolhais

Manuel Fiolhais, With an exceptional h-index of 23 and a recent h-index of 10 (since 2020), a distinguished researcher at Universidade de Coimbra,

His recent articles reflect a diverse array of research interests and contributions to the field:

Search for new phenomena with top-quark pairs and large missing transverse momentum using 140 fb−1 of pp collision data at = 13 TeV with the ATLAS detector

A fold catastrophe potential illustrated with a pure mechanical apparatus

Photoelectric Effect and Relativity

Search for Higgs boson pair production in the two bottom quarks plus two photons final state in collisions at with the ATLAS detector

Search for Higgs boson production in association with a high-energy photon via vector-boson fusion with decay into bottom quark pairs at root s= 13 TeV with the ATLAS detector

Mechanical apparatus for the fold catastrophe demonstration

Sistema mecánico con un potencial catastrófico

Manuel Fiolhais Information

University	Universidade de Coimbra
Position	Professor Catedrático de Física Portugal
Citations(all)	2078
Citations(since 2020)	366
Cited By	2358
hIndex(all)	23
hIndex(since 2020)	10
i10Index(all)	54
i10Index(since 2020)	10
Email	Access Email
University Profile Page	Universidade de Coimbra

Top articles of Manuel Fiolhais

Search for new phenomena with top-quark pairs and large missing transverse momentum using 140 fb−1 of pp collision data at = 13 TeV with the ATLAS detector

Authors

Georges Aad,Erlend Aakvaag,Braden Keim Abbott,Kira Abeling,Nils Julius Abicht,Haider Abidi,Mohammed Aboelela,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Anke Ackermann,Claire Adam Bourdarios,Leszek Adamczyk,Sagar Addepalli,Matt Addison,Jahred Adelman,Aytul Adiguzel,Tim Adye,Tony Affolder,Yoav Afik,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Sudha Ahuja,Xiaocong Ai,Giulio Aielli,Arya Aikot,Malak Ait Tamlihat,Brahim Aitbenchikh,Iakov Aizenberg,Melike Akbiyik,Torsten Akesson,Andrei Akimov,Daiya Akiyama,Nilima Nilesh Akolkar,Sina Aktas,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Pietro Albicocco,Guillaume Lucas Albouy,Sara Alderweireldt,Zackary Lee Alegria,Martin Aleksa,Igor Alexandrov,Calin Alexa,Theodoros Alexopoulos,Fabrizio Alfonsi,Malte Algren,Muhammad Alhroob,Babar Ali,Hanadi Ali,Shahzad Ali,Samuel William Alibocus,Malik Aliev,Gianluca Alimonti,Wael Alkakhi,Corentin Allaire,Benedict Allbrooke,Julia Frances Allen,Cristian Andres Allendes Flores,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Manuel Alvarez Estevez,Adrian Alvarez Fernandez,Mario Alves Cardoso,Mariagrazia Alviggi,Mohamed Aly,Yara Do Amaral Coutinho,Alessandro Ambler,Christoph Amelung,Maximilian Amerl,Christoph Ames,Dante Amidei,Kyle Amirie,Susana Patricia Amor dos Santos,Kieran Robert Amos,Viktor Ananiev,Christos Anastopoulos,Timothy Robert Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Fabio Anulli,Masato Aoki,Takumi Aoki,Javier Alberto Aparisi Pozo,Marco Aparo,Ludovica Aperio Bella,Christian Appelt,Aram Apyan,Sergio Javier Arbiol Val,Chiara Arcangeletti,Ayana Tamu Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,Jan-Hendrik Arling,Olivier Arnaez,Hannah Arnold,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Ketevi Adikle Assamagan,Robert Astalos,Karl Sten Vilhelm Astrand,Rose Atashi,Ryan Justin Atkin,Markus Julian Atkinson,Hicham Atmani,Prachi Atmasiddha,Kamil Augsten,Silvia Auricchio,Adrien Auriol,Volker Andreas Austrup,Giuseppe Avolio,Konstantinos Axiotis,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Alexander Bachiu,Karl Filip Backman,Anthony Badea,Tamas Marton Baer,Paolo Bagnaia,Marzieh Bahmani,Daniel Bahner,Kehang Bai,Adam Bailey,John Baines,Luke Baines

Published Date

2024/1/30

A search is conducted for new phenomena in events with a top quark pair and large missing transverse momentum, where the top quark pair is reconstructed in final states with one isolated electron or muon and multiple jets. The search is performed using the Large Hadron Collider proton--proton collision data sample at a centre-of-mass energy of TeV recorded by the ATLAS detector that corresponds to an integrated luminosity of 140 fb. An analysis based on neural network classifiers is optimised to search for directly produced pairs of supersymmetric partners of the top quark (stop), and to search for spin-0 mediators, produced in association with a pair of top quarks, that decay into dark-matter particles. In the stop search, the analysis is designed to target models in which the mass difference between the stop and the neutralino from the stop decay is close to the top quark mass. This new search is combined with previously published searches in final states with different lepton multiplicities. No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set. Models with neutralinos with masses up to 570 GeV are excluded, while for small neutralino masses models are excluded for stop masses up to 1230 GeV. Scalar (pseudoscalar) dark matter mediator masses as large as 350 (370) GeV are excluded when the coupling strengths of the mediator to Standard Model and dark-matter particles are both set to one. At lower mediator masses, models with production cross-sections as small as 0.15 (0.16) times the nominal predictions are excluded. Results of this search are also used to set …

A fold catastrophe potential illustrated with a pure mechanical apparatus

Authors

Manuel Fiolhais

Journal

Journal of Physics: Conference Series

Published Date

2024/2/1

We present an apparatus consisting of a bar tightly connected to a disc, that acts as a pulley, free to rotate around its axis. A body is suspended by means of a thread that is wrapped around the collar of the pulley. Depending on the values of the masses and also on the geometric parameters of the various parts of the apparatus, the system may, or may not, stay in static equilibrium. When it moves, the system may perform stable oscillations around stability positions, or the body continuously falls down, while the pulley executes a sequence of complete rotations. We analyse these very diverse behaviours, basing the discussion on the shape of the potential energy, plotted as a function of the angular position of the system, stressing that the experiment provides a very good example of a fold catastrophe potential, besides being funny and pedagogically very valuable.

Photoelectric Effect and Relativity

Authors

Manuel Fiolhais

Published Date

2023/7/3

We apply energy-momentum four-vectors to the description of the photoelectric effect. As a consequence of using a full relativistic covariant formalism, we treat, on an equal footing, the conservation of the linear momentum and of the energy. In this work, our focus is on enhancing the advantage, pedagogically speaking, of using a formalism which automatically incorporates invariance under Lorentz transformations in the treatment of this famous historic experiment. The same type of approach, using relativistic four-vectors, can also be applied to other basic problems, including other historic ones such as the Compton effect.

Search for Higgs boson pair production in the two bottom quarks plus two photons final state in collisions at with the ATLAS detector

Authors

Georges Aad,Brad Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,S Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,Sara Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Christos Anastopoulos,Nansi Andari,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Victor Andrei,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,Chiara Arcangeletti,ATH Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,S Auricchio,VA Austrup,G Avner,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,A Badea,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,E Ballabene,F Balli,WK Balunas,J Balz

Journal

Physical Review D

Published Date

2022/9/6

Searches are performed for nonresonant and resonant di-Higgs boson production in the b b γ γ final state. The dataset used corresponds to an integrated luminosity of 139 fb− 1 of proton–proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No excess above the expected background is found and upper limits on the di-Higgs boson production cross sections are set. A 95% confidence-level upper limit of 4.2 times the cross section predicted by the Standard Model is set on p p→ H H nonresonant production, where the expected limit is 5.7 times the Standard Model predicted value. The expected constraints are obtained for a background hypothesis excluding p p→ H H production. The observed (expected) constraints on the Higgs boson trilinear coupling modifier κ λ are determined to be [− 1.5, 6.7]([− 2.4, 7.7]) at 95% confidence level, where the …

Search for Higgs boson production in association with a high-energy photon via vector-boson fusion with decay into bottom quark pairs at root s= 13 TeV with the ATLAS detector

Authors

Georges Aad,Brad Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz

Journal

Journal of high energy physics

Published Date

2021/3

A search is presented for the production of the Standard Model Higgs boson in association with a high-energy photon. With a focus on the vector-boson fusion process and the dominant Higgs boson decay into b-quark pairs, the search benefits from a large reduction of multijet background compared to more inclusive searches. Results are reported from the analysis of 132 fb− 1 of pp collision data at= 13 TeV collected with the ATLAS detector at the LHC. The measured Higgs boson signal yield in this final-state signature is 1. 3±1. 0 times the Standard Model prediction. The observed significance of the Higgs boson signal above the background is 1. 3 standard deviations, compared to an expected significance of 1. 0 standard deviations.

Mechanical apparatus for the fold catastrophe demonstration

Authors

M Fiolhais,B Golli,R Nogueira

Journal

European Journal of Physics

Published Date

2021/4/20

We present and discuss a non-expensive mechanical experiment which is very suitable for a classroom demonstration of the fold catastrophe behaviour. The apparatus consists of a bar attached to a pulley, to which a hanging body is connected by means of a thread wrapped around its rim. The system may perform stable oscillations or, else, the body may continuously fall down, while the pulley executes a sequence of 360◦ rotations. This behaviour is analysed in connection with the shape of the potential, which is a good example of a fold catastrophe potential. For the system to perform stable oscillations, that shape reminds a clothes washboard, with local maxima and minima, a potential well known in superconducting quantum computing. We provide some hints for the instructor to explore the device in lab classes.

Sistema mecánico con un potencial catastrófico

Authors

Manuel Fiolhais,Rogério Nogueira

Journal

Revista Española de Física

Published Date

2020/3/27

Se analiza un sistema puramente mecánico que puede discutirse mediante un potencial llamado de tabla de lavar. El comportamiento de este sistema puede ser muy diferente mediante pequeños cambios tanto en las condiciones cinemáticas iniciales como en los parámetros que intervienen en dicho potencial. El estudio en el aula de este conjunto de situaciones, que se conoce como “de comportamiento catastrófico”, permite para revelar a los estudiantes que no todos los potenciales tienen que tener un “comportamiento bueno.

See List of Professors in Manuel Fiolhais University(Universidade de Coimbra)

Manuel Fiolhais FAQs

What is Manuel Fiolhais's h-index at Universidade de Coimbra?

The h-index of Manuel Fiolhais has been 10 since 2020 and 23 in total.

What are Manuel Fiolhais's top articles?

The articles with the titles of

Search for new phenomena with top-quark pairs and large missing transverse momentum using 140 fb−1 of pp collision data at = 13 TeV with the ATLAS detector

A fold catastrophe potential illustrated with a pure mechanical apparatus

Photoelectric Effect and Relativity

Search for Higgs boson pair production in the two bottom quarks plus two photons final state in collisions at with the ATLAS detector

Search for Higgs boson production in association with a high-energy photon via vector-boson fusion with decay into bottom quark pairs at root s= 13 TeV with the ATLAS detector

Mechanical apparatus for the fold catastrophe demonstration

Sistema mecánico con un potencial catastrófico

are the top articles of Manuel Fiolhais at Universidade de Coimbra.