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Abidi, S. H.; Addepalli, S. V.; Aggarwal, A.; Camelia, E. Alunno; Antel, C.; Balaji, S.; Balek, P.; Bayirli, A.; Beddall, A. J.; Bhopatkar, V. S.; Bi, R.; Bielski, R.; Bouquet, R.; Brahimi, N.; Buckley, A. G.; Buzykaev, A. R.; Cardenas, J. C. J.; Gimenez, V. Castillo; Chekulaev, S. V.; Cheremushkina, E.; Christopher, L. D.; Dai, T.; De Maria, A.; De Salvo, A.; Deiana, A. M.; Dell’Acqua, A.; Dunford, M.; Fanti, M.; Fortin, E.; Francis, D.; Fuster, J.; Gan, K. K.; Graham, K.; He, Y.; Hertenberger, R.; Hodgkinson, M. C.; Huiberts, S. K.; Ilg, A.; Jarlskog, G.; Jia, J.; Jin, S.; Jovicevic, J.; Kaji, T.; Kawamoto, T.; Kepka, O.; Khubua, J.; Kirchmeier, D.; Klein, L.; Klingl, T.; Leitgeb, C. E.; Lohwasser, K.; Longo, R.; Lu, G.; Maidantchik, C.; Agullo, P. Martinez; Merlassino, C.; Middleton, R. P.; Morisbak, V.; Moss, J.; Myers, A. J.; Nickerson, R. B.; Ochi, A.; Peng, C.; Peralva, B. S.; Sanchez, L. Pereira; Perepelitsa, D. V.; Pownall, G.; Ibanez, A. Prades; Martin, M. A. Principe; Queitsch-Maitland, M.; Renardi, A.; Salnikov, A.; Schwarz, T. A.; Sharma, S.; Sinha, S.; Sobie, R.; Soualah, R.; Soukharev, A. M.; Stonjek, S.; Sultansoy, S.; Sumida, T.; Araya, S. Tapia; Taylor, G. N.; Teoh, J. J.; Terashi, K.; Teuscher, R. J.; Tokár, S.; Tsai, F.; Usai, G.; Vittori, C.; Vormwald, B.; Walkowiak, W.; Wang, S. M.; Weirich, M.; White, A.; Ye, J.; Zaplatilek, O.; Zhao, Z.; Zhu, J.; Zhuang, X.
European physical journal. C, Particles and fields, 2022, Letnik: 82, Številka: 8Journal Article
A search for the Higgs boson decaying into a pair of charm quarks is presented. The analysis uses proton–proton collisions to target the production of a Higgs boson in association with a leptonically decaying W or Z boson. The dataset delivered by the LHC at a centre-of-mass energy of and recorded by the ATLAS detector corresponds to an integrated luminosity of 139 fb - 1 . Flavour-tagging algorithms are used to identify jets originating from the hadronisation of charm quarks. The analysis method is validated with the simultaneous measurement of WW , WZ and ZZ production, with observed (expected) significances of 2.6 (2.2) standard deviations above the background-only prediction for the ( W / Z ) Z ( → c c ¯ ) process and 3.8 (4.6) standard deviations for the ( W / Z ) W ( → c q ) process. The ( W / Z ) H ( → c c ¯ ) search yields an observed (expected) upper limit of 26 (31) times the predicted Standard Model cross-section times branching fraction for a Higgs boson with a mass of , corresponding to an observed (expected) constraint on the charm Yukawa coupling modifier | κ c | < 8.5 ( 12.4 ) , at the 95% confidence level. A combination with the ATLAS ( W / Z ) H , H → b b ¯ analysis is performed, allowing the ratio κ c / κ b to be constrained to less than 4.5 at the 95% confidence level, smaller than the ratio of the b- and c-quark masses, and therefore determines the Higgs-charm coupling to be weaker than the Higgs-bottom coupling at the 95% confidence level.
