Direct constraint on the Higgs–charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector

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 b...

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Vydané v:	European Physical Journal C Ročník 82; číslo 8
Hlavní autori:	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.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Berlin/Heidelberg Springer Berlin Heidelberg 2022 Springer Springer Nature B.V Springer Nature
Predmet:	Algorithms Analysis Astronomy Astrophysics and Cosmology Charm (particle physics) Collisions (Nuclear physics) Confidence intervals Constraints Coupling Detectors Elementary Particles Flavor (particle physics) Fysik Hadrons Heavy Ions Higgs bosons Large Hadron Collider Luminosity Measurement Science and Instrumentation Natural Sciences Naturvetenskap Nuclear Energy Nuclear Physics Particle collisions Particle decay Physical Sciences Physics Physics and Astronomy Protons Quantum Field Theories Quantum Field Theory Quarks Regular Article - Experimental Physics Searching Standard deviation Standard model (particle physics) String Theory Subatomic Physics Subatomär fysik
ISSN:	1434-6044, 1434-6052, 1431-5858, 1434-6052
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Popis
Shrnutí:	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.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division None AC02-76SF00515
ISSN:	1434-6044 1434-6052 1431-5858 1434-6052
DOI:	10.1140/epjc/s10052-022-10588-3