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 $$ \s

A bstract Inclusive and differential cross section measurements of top quark pair ( $$ \textrm{t}\overline{\textrm{t}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) production in association with a photon (γ) are performed as a function of lepton, photon, top quark, and $$ \textrm{t}\overline{\textrm{t}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> kinematic observables, using data from proton-proton collisions at $$ \sqrt{s}=13 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> 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 $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> is measured to be 137 ± 8 fb, in a phase space including events with a high momentum, isolated photon. The fiducial cross section of $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> 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 $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> and $$ \textrm{t}\overline{\textrm{t}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> 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 $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> production is also measured to be −0.012 ± 0.042, compatible with both the standard model prediction and with no asymmetry.

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Journal
Journal of High Energy Physics
Published
2026-04-10
DOI
https://doi.org/10.1007/jhep04(2026)086
Primary Topic
Particle physics theoretical and experimental studies
Type
article
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article

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 $$ \s

S. Tavernier, C. Hensel, M. Tytgat, K. Skovpen et al.
Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

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 $$ \s

S. Tavernier, C. Hensel, M. Tytgat, K. Skovpen, M. Soeiro, A. Malara, P. Kashko, H. Evard, P. Mastrapasqua, N. Breugelmans, D. Vannerom, C.-E. Wulz, D. Schwarz, C. Giordano, A. Cappati, M. De Coen, P. Malek, S. Dansana, M. Dragicevic, T. Janssen, F. Gameiro Casalinho, M. Delcourt, C. Delaere, A. M. Tomaru, C. Vander Velde, J. De Favereau De Jeneret, D. Marckx, P. Vanlaer, C. Mora Herrera, N. Van Den Bossche, J. Knolle, I. Makarenko, A. O. Guzel, M. Sonawane, L. Wezenbeek, G. A. Alves, M. A. Shahzad, H. Kwon, D. Liko, F. Zhang, P. S. Hussain, W. Adam, F. Heyen, L. Thomas, A. De Moor, S. Van Putte, W. Waltenberger, A. Bethani, J. Schieck, D. Dobur, L. Favart, W. L. Aldá Júnior, I. Mikulec, R. Schöfbeck, G. Gokbulut, S. Bein, V. Lemaitre, J. Bierkens, J. Lidrych, J. W. Andrejkovic, M. Barroso Ferreira Filho, L. Benato, I. De Bruyn, M. Matthewman, M. Vanden Bemden, E. J. Tonelli Manganote, J. van der Linden, D. Müller, A. Giammanco, P. Rebello Teles, G. De Lentdecker, T. Van Laer, S. Lowette, J. Vandenbroeck, P. Gianneios, B. Clerbaux, G. Bruno, Y. Hong, J. D’Hondt, D. Ocampo Henao, B. Bilin, M. Shooshtari, G. P. Van Onsem, J. Song, A. Tumasyan, F. A. Khan, A. J. Li, N. Krammer, A. Benecke, V. Makarenko, E. Coelho, A. Hayrapetyan, T. Bergauer, T. Menezes De Oliveira, M. Jeitler, S. Turkcapar, A. Khalilzadeh, P. Van Mechelen, A. K. Das, A. Vilela Pereira
article en

Abstract

A bstract Inclusive and differential cross section measurements of top quark pair ( $$ \textrm{t}\overline{\textrm{t}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) production in association with a photon (γ) are performed as a function of lepton, photon, top quark, and $$ \textrm{t}\overline{\textrm{t}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> kinematic observables, using data from proton-proton collisions at $$ \sqrt{s}=13 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> 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 $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> is measured to be 137 ± 8 fb, in a phase space including events with a high momentum, isolated photon. The fiducial cross section of $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> 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 $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> and $$ \textrm{t}\overline{\textrm{t}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> 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 $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>γ</mml:mi> </mml:math> production is also measured to be −0.012 ± 0.042, compatible with both the standard model prediction and with no asymmetry.

Journal of High Energy PhysicsVol. 2026(4)
University of Notre Dame (US), Université Libre de Bruxelles (BE), A. Alikhanyan National Laboratory (AM), Vrije Universiteit Brussel (BE), TU Wien (AT), University of Antwerp (BE), University of California, Santa Barbara (US), Yerevan State University (AM), Ghent University Hospital (BE), Universidade do Estado do Rio de Janeiro (BR), Centro Brasileiro de Pesquisas Físicas (BR), Institute of High Energy Physics (AT), University of Chinese Academy of Sciences (CN), UCLouvain (BE)
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Particle physics theoretical and experimental studies
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