Inclusive and differential measurements of the $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ cross section and the $$ \textrm{t}\overline{\textrm{t}}\upgamma /\textrm{t}\overline{\textrm{t}} $$ cross section ratio in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV
Articolo
Data di Pubblicazione:
2026
Abstract:
Inclusive and differential cross section measurements of top quark pair (tt¯) production in association with a photon (γ) are performed as a function of lepton, photon, top quark, and tt¯ kinematic observables, using data from proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 138 fb−1, collected at the CERN LHC with the CMS detector. Events containing two leptons (electrons or muons) and a photon in the final state are considered. The fiducial cross section of tt¯γ is measured to be 137 ± 8 fb, in a phase space including events with a high momentum, isolated photon. The fiducial cross section of tt¯γ is also measured to be 56 ± 5 fb when considering only events where the photon is emitted in the production part of the process. Both measurements are in agreement with the theoretical predictions, of 126 ± 19 fb and 57 ± 5 fb, respectively. Differential measurements are performed at the particle and parton levels. Additionally, inclusive and differential ratios between the cross sections of tt¯γ and tt¯ production are measured. The inclusive ratio is found to be 0.0133 ± 0.0005, in agreement with the standard model prediction of 0.0127 ± 0.0008. The top quark charge asymmetry in tt¯γ production is also measured to be −0.012 ± 0.042, compatible with both the standard model prediction and with no asymmetry.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Hadron-Hadron Scattering; Particle and Resonance Production; Top Physics
Elenco autori:
Null, Null; Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Benato, L.; Bergauer, T.; Dragicevic, M.; Giordano, C.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Matthewman, M.; Mikulec, I.; Schieck, J.; Schwarz, D.; Schöfbeck, R.; Shooshtari, M.; Sonawane, M.; Waltenberger, W.; Wulz, C. -E.; Janssen, T.; Kwon, H.; Ocampo Henao, D.; Van Laer, T.; Van Mechelen, P.; Bierkens, J.; Breugelmans, N.; D'Hondt, J.; Dansana, S.; De Moor, A.; Delcourt, M.; Heyen, F.; Hong, Y.; Kashko, P.; Lowette, S.; Makarenko, I.; Müller, D.; Song, J.; Tavernier, S.; Tytgat, M.; Van Onsem, G. P.; Van Putte, S.; Vannerom, D.; Bilin, B.; Clerbaux, B.; Das, A. K.; De Bruyn, I.; De Lentdecker, G.; Evard, H.; Favart, L.; Gianneios, P.; Khalilzadeh, A.; Khan, F. A.; Malara, A.; Shahzad, M. A.; Thomas, L.; Vanden Bemden, M.; Vander Velde, C.; Vanlaer, P.; Zhang, F.; De Coen, M.; Dobur, D.; Gokbulut, G.; Knolle, J.; Marckx, D.; Skovpen, K.; Tomaru, A. M.; Van Den Bossche, N.; Van Der Linden, J.; Vandenbroeck, J.; Wezenbeek, L.; Bein, S.; Benecke, A.; Bethani, A.; Bruno, G.; Cappati, A.; De Favereau De Jeneret, J.; Delaere, C.; Gameiro Casalinho, F.; Giammanco, A.; Guzel, A. O.; Lemaitre, V.; Lidrych, J.; Malek, P.; Mastrapasqua, P.; Turkcapar, S.; Alves, G. A.; Barroso Ferreira Filho, M.; Coelho, E.; Hensel, C.; Menezes De Oliveira, T.; Mora Herrera, C.; Rebello Teles, P.; Soeiro, M.; Tonelli Manganote, E. J.; Vilela Pereira, A.; Aldá Júnior, W. L.; Brandao Malbouisson, H.; Carvalho, W.; Chinellato, J.; Costa Reis, M.; Da Costa, E. M.; Da Silveira, G. G.; De Jesus Damiao, D.; Fonseca De Souza, S.; Gomes De Souza, R.; Jesus, S. S.; Laux Kuhn, T.; Macedo, M.; Mota Amarilo, K.; Mundim, L.; Nogima, H.; Pinheiro, J. P.; Santoro, A.; Sznajder, A.; Thiel, M.; Torres Da Silva De Araujo, F.; Bernardes, C. A.; Damas, F.; Gregores, E. M.; Lopes Da Costa, B.; Maietto Silverio, I.; Mercadante, P. G.; Novaes, S. F.; Orzari, B.; Padula, Sandra S.; Scheurer, V.; Fernandez Perez Tomei, T. R.; Aleksandrov, A.; Antchev, G.; Danev, P.; Hadjiiska, R.; Iaydjiev, P.; Shopova, M.; Sultanov, G.; Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P.; Petrov, A.; Keshri, S.; Laroze, D.; Thakur, S.; Brooks, W.; Cheng, T.; Javaid, T.; Wang, L.; Yuan, L.; Hu, Z.; Liang, Z.; Liu, J.; Wang, X.; Yang, H.; Chen, G. M.; Chen, H. S.; Chen, M.; Chen, Y.; Hou, Q.; Hou, X.; Iemmi, F.; Jiang, C. H.; Kapoor, A.; Liao, H.; Liu, G.; Liu, Z. -A.; Song, J. N.; Song, S.; Tao, J.; Wang, C.; Wang, J.; Zhang, H.; Zhao, J.; Agapitos, A.; Ban, Y.; Carvalho Antunes De Oliveira, A.; Deng, S.; Guo, B.; Guo, Q.; Jiang, C.; Levin, A.; Li, C.; Li, Q.; Mao, Y.; Qian, S.; Qian, S. J.; Qin, X.; Quaranta, C.; Sun, X.; Wang, D.; Wang, J.; Zhang, M.; Zhao, Y.; Zhou, C.; Yang, S.; You, Z.; Jaffel, K.; Lu, N.; Bauer, G.; Cui, Z.; Li, B.; Wang, H.; Yi, K.; Zhang, J.; Li, Y.; Lin, Z.; Lu, C.; Xiao, M.; Avila, C.; Barbosa Trujillo, D. A.; Cabrera, A.; Florez, C.; Fraga, J.; Reyes Vega, J. A.; Rendón, C.; Rodriguez, M.; Ruales Barbosa, A. A.; Ruiz Alvarez, J. D.; Godinovic, N.; Lelas, D.; Sculac, A.; Kovac, M.; Petkovic, A.; Sculac, T.; Bargassa, P.; Brigljevic, V.; Chitroda, B. K.; Ferencek, D.; Jakovcic, K.; Starodumov, A.; Susa, T.; Attikis, A.; Christoforou, K.; Leonidou, C.; Nicolaou, C.; Paizanos, L.; Ptochos, F.; Razis, P. A.; Rykaczewski, H.; Saka, H.; Stepennov, A.; Finger, M.; Finger, M.; Ayala, E.; Carrera Jarrin, E.; El-mahdy, B.; Khalil, S.; Hussein, A.; Mohammed, H.; Ehataht, K.; Kadastik, M.; Lange, T.; Nielsen, C.; Pata, J.; Raidal, M.; Seeba, N.; Tani, L.; Brücken, E.; Milieva, A.; Osterberg, K.; Voutilainen, M.; Garcia, F.; Inkaew, P.; Kallonen, K. T. S.; Kumar Verma, R.; Lampén, T.; Lassila-Perini, K.; Lehtela, B.; Lehti, S.; Lindén, T.; Mancilla Xinto, N. R.; Myllymäki, M.; Rantanen, M. M.; Saariokari, S.; Toikka, N. T.; Tuominiemi, J.; Bin Norjoharuddeen, N.; Kirschenmann, H.; Luukka, P.; Petrow, H.; Besancon, M.; Couderc
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