$CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow \gamma\gamma$ with the ATLAS Detector$
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CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow \gamma\gamma$ with the ATLAS Detector

A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production in association with a top quark pair (tt¯H) or single top quark (tH) is studied...

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Bibliographic Details
Published in:	Physical review letters Vol. 125; no. 6
Main Authors:	Aad, Georges, Abbott, Brad, Abbott, Dale Charles, Abed Abud, Adam, Abeling, Kira, Abhayasinghe, Deshan Kavishka, Abidi, Syed Haider, Abouzeid, Ossama, Abraham, Nicola, Abramowicz, Halina, Abreu, Henso, Abulaiti, Yiming, Acharya, Bobby Samir, Achkar, Baida, Adam, Lennart, Adam Bourdarios, Claire, Adamczyk, Leszek, Adamek, Lukas, Adelman, Jahred, Adersberger, Michael, Adiguzel, Aytul, Adorni, Sofia, Adye, Tim, Affolder, Tony, Afik, Yoav, Agapopoulou, Christina, Agaras, Merve Nazlim, Aggarwal, Anamika, Agheorghiesei, Catalin, Aguilar Saavedra, Juan Antonio, Ahmad, Ammara, Ahmadov, Faig, Ahmed, Waleed Syed, Ai, Xiaocong, Aielli, Giulio, Akatsuka, Shunichi, Akbiyik, Melike, Akesson, Torsten Paul Ake, Akilli, Ece, Akimov, Andrei, Al Khoury, Konie, Alberghi, Gian Luigi, Albert, Justin, Alconada Verzini, Maria Josefina, Alderweireldt, Sara Caroline, Aleksa, Martin, Aleksandrov, Igor, Alexa, Calin, Alexopoulos, Theodoros, Alfonsi, Alice, Alfonsi, Fabrizio, Alhroob, Muhammad, Ali, Babar, Ali, Shahzad, Aliev, Malik, Alimonti, Gianluca, Allaire, Corentin, Allbrooke, Benedict, Allen, Benjamin William, Allport, Phillip, Aloisio, Alberto, Alonso, Francisco, Alpigiani, Cristiano, Alunno Camelia, Elio, Alvarez Estevez, Manuel, Alviggi, Mariagrazia, Amaral Coutinho, Yara, Ambler, Alessandro, Ambroz, Luca, Amelung, Christoph, Amidei, Dante Eric, Amor dos Santos, Susana Patricia, Amoroso, Simone, Amrouche, Cherifa Sabrina, An, Fenfen, Anastopoulos, Christos, Andari, Nansi, Andeen, Timothy, Anders, John Kenneth, Andrean, Stefio Yosse, Andreazza, Attilio, Andrei, George Victor, Anelli, Christopher Ryan, Angelidakis, Stylianos, Angerami, Aaron, Anisenkov, Alexey, Annovi, Alberto, Antel, Claire, Anthony, Matthew Thomas, Antipov, Egor, Antonelli, Mario, Antrim, Daniel Joseph, Anulli, Fabio, Aoki, Masato, Aparisi Pozo, Javier Alberto, Aparo, Marco, Aperio Bella, Ludovica, Aranzabal Barrio, Nordin, Araujo Ferraz, Victor, Araujo Pereira, Rodrigo
Format:	Journal Article
Language:	English
Published:	American Physical Society 2020
Subjects:	High Energy Physics - Experiment Physics Q007TTH S126CP Higgs particle: radiative decay mass spectrum: (2photon) top: decay modes top: pair production ATLAS top: single production S126STH p p: colliding beams 13000 GeV-cms S126PTH decay: angular distribution experimental results mass spectrum: two-photon Higgs particle: coupling CERN LHC Coll Elementary Particles and Fields CP: violation data analysis method Higgs particle: interaction photon: pair production Higgs particle: associated production p p: scattering category cross section: ratio: upper limit
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Summary:	A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production in association with a top quark pair (tt¯H) or single top quark (tH) is studied. The analysis uses 139 fb-1 of proton–proton collision data recorded at a center-of-mass energy of s=13 TeV with the ATLAS detector at the Large Hadron Collider. Assuming a CP-even coupling, the tt¯H process is observed with a significance of 5.2 standard deviations. The measured cross section times H→γγ branching ratio is 1.64-0.36+0.38(stat)-0.14+0.17(sys) fb, and the measured rate for tt¯H is 1.43-0.31+0.33(stat)-0.15+0.21(sys) times the Standard Model expectation. The tH production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A CP-mixing angle greater (less) than 43 (-43)° is excluded at 95% confidence level.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.125.061802