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Title: Search for CP violation in t t ¯ H and tH production in multilepton channels in proton-proton collisions at √<i>s</i> = 13 TeV
Authors: Tumasyan, A
Adam, W
Andrejkovic, JW
Bergauer, T
Chatterjee, S
Damanakis, K
Dragicevic, M
Escalante Del Valle, A
Hussain, PS
Jeitler, M
Krammer, N
Da Costa, EM
Da Silveira, GG
Khan, A
De Jesus Damiao, D
Cole, JE
Coldham, K
Lechner, L
Liko, D
Mikulec, I
Paulitsch, P
Pitters, FM
Schieck, J
Schöfbeck, R
Schwarz, D
Templ, S
Waltenberger, W
Wulz, CE
Darwish, MR
Janssen, T
Kello, T
Rejeb Sfar, H
Van Mechelen, P
Bols, ES
D’Hondt, J
De Moor, A
Delcourt, M
El Faham, H
Lowette, S
Moortgat, S
Morton, A
Müller, D
Sahasransu, AR
Tavernier, S
Van Doninck, W
Vannerom, D
Clerbaux, B
De Lentdecker, G
Favart, L
Jaramillo, J
Lee, K
Mahdavikhorrami, M
Makarenko, I
Malara, A
Paredes, S
Pétré, L
Postiau, N
Starling, E
Thomas, L
Vanden Bemden, M
Vander Velde, C
Vanlaer, P
Dobur, D
Knolle, J
Lambrecht, L
Mestdach, G
Niedziela, M
Rendón, C
Roskas, C
Samalan, A
Skovpen, K
Tytgat, M
Van Den Bossche, N
Vermassen, B
Wezenbeek, L
Benecke, A
Bruno, G
Bury, F
Caputo, C
David, P
Delaere, C
Donertas, IS
Giammanco, A
Jaffel, K
Jain, S
Lemaitre, V
Mondal, K
Prisciandaro, J
Taliercio, A
Tran, TT
Vischia, P
Wertz, S
Alves, GA
Coelho, E
Hensel, C
Moraes, A
Rebello Teles, P
Aldá Júnior, WL
Alves Gallo Pereira, M
Barroso Ferreira Filho, M
Reid, ID
Brandao Malbouisson, H
Carvalho, W
Chinellato, J
Kyberd, P
Keywords: CP violation;hadron-hadron scattering;Higgs physics
Issue Date: 12-Jul-2023
Publisher: Springer Nature
Citation: Tumasyan, A. et al. for the benefit (2023) 'Search for CP violation in t t ¯ H and tH production in multilepton channels in proton-proton collisions at √<i>s</i> = 13 TeV', Journal of High Energy Physics, 2023 (7), 92, pp. 1 - 54. doi: 10.1007/JHEP07(2023)092.
Abstract: The charge-parity (CP) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the tt¯ and tH associated production, using 138 fb^{−1} of data collected in proton-proton collisions at s√ = 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H → ττ and the top quarks decay via t → Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation of CP-even from CP-odd scenarios. Two-dimensional confidence regions are set on κt and κ~t, which are respectively defined as the CP-even and CP-odd top-Higgs Yukawa coupling modifiers. No significant fractional CP-odd contributions, parameterized by the quantity |fHttCP| are observed; the parameter is determined to be |fHttCP| = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The results are combined with previous results covering the H → ZZ and H → γγ decay modes, yielding two- and one-dimensional confidence regions on κt and κ~t, while |fHttCP| is determined to be |fHttCP| = 0.28 with an interval of |fHttCP| < 0.55 at 68% confidence level, in agreement with the standard model CP-even prediction of |fHttCP| = 0.
Description: A preprint version of the article is available at arXiv:2208.02686v2 [hep-ex], . Comments: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at this http URL (CMS Public Pages). Report number: CMS-HIG-21-006, CERN-EP-2022-157.
ISSN: 1126-6708
Other Identifiers: ORCiD: A. Tumasyan
ORCiD: Joanne E. Cole
ORCiD: Akram Khan
ORCiD: Paul Kyberd
ORCiD: Ivan D. Reid
arXiv:2208.02686v2 [hep-ex]
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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