@article{10902/28723,
year = {2022},
month = {5},
url = {https://hdl.handle.net/10902/28723},
abstract = {The production cross section of a top quark pair in association with a photon is measured in proton-proton collisions in the decay channel with two oppositely charged leptons (e±μ∓, e+e−, or μ+μ−). The measurement is performed using 138 fb−1 of proton-proton collision data recorded by the CMS experiment at s√ = 13 TeV during the 2016–2018 data-taking period of the CERN LHC. A fiducial phase space is defined such that photons radiated by initial-state particles, top quarks, or any of their decay products are included. An inclusive cross section of 175.2 ± 2.5(stat) ± 6.3(syst) fb is measured in a signal region with at least one jet coming from the hadronization of a bottom quark and exactly one photon with transverse momentum above 20 GeV. Differential cross sections are measured as functions of several kinematic observables of the photon, leptons, and jets, and compared to standard model predictions. The measurements are also interpreted in the standard model effective field theory framework, and limits are found on the relevant Wilson coefficients from these results alone and in combination with a previous CMS measurement of the tt¯γ production process using the lepton+jets final state.},
organization = {We congratulate our colleagues in the CERN accelerator departments for the excellent performance of 
the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for 
their contributions to the success of the CMS effort.  In ad- dition, we gratefully acknowledge the 
computing centers and personnel of the Worldwide LHC Computing Grid and other centers for 
delivering so effectively the computing infras- tructure essential to our analyses.  Finally, we 
acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, 
and the supporting computing infrastructure provided by the following funding agencies:  BMBWF and 
FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and 
BNSF (Bulgaria);  CERN; CAS, MoST, and NSFC (China);  MINCIENCIAS
(Colombia);  MSES and CSF (Croatia);  RIF (Cyprus);  SENESCYT (Ecuador);  MoER, ERC PUT and ERDF 
(Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France);  BMBF, DFG, and 
HGF (Germany);  GSRI (Greece);  NK- FIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); 
INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM 
(Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montene-
gro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); 
MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri 
Lanka); Swiss Funding Agencies (Switzer- land); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA 
(Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA).
Individuals have received support from the Marie-Curie program and the European Research Council 
and Horizon 2020 Grant, contract Nos. 675440, 724704, 752730, 758316, 765710,  824093,  884104,  
and  COST  Action  CA16108  (European  Union);  the  Leventis Foundation; the Alfred P. Sloan 
Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office;  the 
Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the 
Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the F.R.S.-FNRS and FWO 
(Belgium) under the “Excellence of Science — EOS” — be.h project n. 30820817; the Beijing Municipal 
Sci- ence & Technology Commission, No. Z191100007219010; the Ministry of Education, Youth and 
Sports (MEYS) of the Czech Republic; the Deutsche Forschungsgemeinschaft (DFG), under Germany’s 
Excellence Strategy — EXC 2121 “Quantum Universe” — 390833306, and under project number 400140256 - 
GRK2497; the Lendület (“Momentum”) Program and the János Bolyai Research Scholarship of the 
Hungarian Academy of Sciences, the New National Excellence Program ÚNKP, the NKFIA research grants 
123842,  123959, 124845, 124850, 125105, 128713, 128786, and 129058 (Hungary); the Council of 
Science and Industrial Research, India; the Latvian Council of Science; the Ministry of Science and 
Higher Education and the National Science Center, contracts Opus 2014/15/B/ST2/03998 and 
2015/19/B/ST2/02861 (Poland); the Fundação para a Ciência e a Tecnologia, grant CEECIND/01334/2018 
(Portugal);  the National Priorities Research Program by Qatar National Research Fund; the Ministry 
of Science and Higher Education, projects no. 0723- 29 –2020-0041 and no.  FSWW-2020-0008, and the Russian Foundation for Basic Research, project No.19-42-703014 (Russia); MCIN/AEI/10.13039/501100011033, ERDF “a way of making  Europe”,  and  the  Programa  Estatal  de  Fomento  de  la  Investigación  Científica y Técnica de Excelencia María de Maeztu, grant MDM-2017-0765 and Programa Severo Ochoa del Principado de Asturias (Spain); the Stavros Niarchos Foundation (Greece); the Rachadapisek Sompot Fund for Postdoctoral Fellowship, 
Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement 
Project (Thailand); the Kavli Foundation; the Nvidia Corporation; the SuperMicro Corporation; the 
Welch Foundation, contract C-1845; and the Weston Havens Foundation (USA).},
publisher = {Springer},
publisher = {Journal of High Energy Physics, 2022, 5, 91},
title = {Measurement of the inclusive and differential tt¯ γ cross sections in the dilepton channel and effective field theory interpretation in proton-proton collisions at √ s = 13 TeV},
author = {Tumasyan, Armen and Brochero Cifuentes, Javier Andrés and Cabrillo Bartolomé, José Iban and Calderón Tazón, Alicia and Duarte Campderros, Jorge and Fernández García, Marcos and Fernández Madrazo, Celia and Fernández Manteca, Pedro José and García Alonso, Andrea and Gómez Gramuglio, Gervasio and Martínez Ruiz del Árbol, Pablo and Matorras Weinig, Francisco and Matorras Cuevas, Pablo and Piedra Gómez, Jonatan and Prieëls, Cedric and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván  and Vizán García, Jesús Manuel},
}