Observation of top-quark pair production in association with a photon and measurement of the production cross section in collisions at TeV using the …

Georges Aad,B Abbott,J Abdallah,S Abdel Khalek,O Abdinov,R Aben,B Abi,M Abolins,OS AbouZeid,H Abramowicz,H Abreu,R Abreu,Y Abulaiti,BS Acharya,L Adamczyk,DL Adams,J Adelman,S Adomeit,T Adye,T Agatonovic-Jovin,JA Aguilar-Saavedra,M Agustoni,SP Ahlen,F Ahmadov,G Aielli,H Akerstedt,TPA Åkesson,G Akimoto,AV Akimov,GL Alberghi,J Albert,S Albrand,MJ Alconada Verzini,M Aleksa,IN Aleksandrov,C Alexa,G Alexander,G Alexandre,T Alexopoulos,M Alhroob,G Alimonti,L Alio,J Alison,BMM Allbrooke,LJ Allison,PP Allport,J Almond,A Aloisio,A Alonso,F Alonso,C Alpigiani,A Altheimer,B Alvarez Gonzalez,MG Alviggi,K Amako,Y Amaral Coutinho,C Amelung,D Amidei,SP Amor Dos Santos,A Amorim,S Amoroso,N Amram,G Amundsen,C Anastopoulos,LS Ancu,N Andari,T Andeen,CF Anders,G Anders,KJ Anderson,A Andreazza,V Andrei,XS Anduaga,S Angelidakis,I Angelozzi,P Anger,A Angerami,F Anghinolfi,AV Anisenkov,N Anjos,A Annovi,A Antonaki,M Antonelli,A Antonov,J Antos,F Anulli,M Aoki,L Aperio Bella,R Apolle,G Arabidze,I Aracena,Y Arai,JP Araque,ATH Arce,JF Arguin,S Argyropoulos,M Arik,AJ Armbruster,O Arnaez,V Arnal,H Arnold,M Arratia,O Arslan,A Artamonov,G Artoni,S Asai,N Asbah,A Ashkenazi,B Åsman,L Asquith,K Assamagan,R Astalos,M Atkinson,NB Atlay,B Auerbach,K Augsten,M Aurousseau,G Avolio,G Azuelos,Y Azuma,MA Baak,AE Baas,C Bacci,H Bachacou,K Bachas,M Backes,M Backhaus,J Backus Mayes,E Badescu,P Bagiacchi,P Bagnaia,Y Bai,T Bain,JT Baines,OK Baker,P Balek,F Balli,E Banas,Sw Banerjee,AAE Bannoura,V Bansal,HS Bansil,L Barak,SP Baranov,EL Barberio,D Barberis,M Barbero,T Barillari,M Barisonzi,T Barklow

Physical Review D（2015）

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摘要

A search is performed for top-quark pairs (t t) produced together with a photon (γ) with transverse energy greater than 20 GeV using a sample of t t candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb− 1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 t t γ candidate events are observed in the electron and muon channels, to be compared to the expectation of 79±26 and 120±39 non-t t γ background events, respectively. The production of t t γ events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The t t γ production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the …

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