2024/10/25 by ATLAS Collaboration · 7 citations
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.2410.19611
A study of the Higgs boson decaying into bottom quarks (H → bb) and charm quarks (H → cc) is performed, in the associated production channel of the Higgs boson with a W or Z boson, using 140 fb-1 of proton-proton collision data at √(s) = 13 TeV collected by the ATLAS detector. The individual production of WH and ZH with H → bb is established with observed (expected) significances of 5.3 (5.5) and 4.9 (5.6) standard deviations, respectively. Differential cross-section measurements of the gauge boson transverse momentum within the simplified template cross-section framework are performed in a total of 13 kinematical fiducial regions. The search for the H → cc decay yields an observed (expected) upper limit at 95% confidence level of 11.5 (10.6) times the Standard Model prediction. The results are also used to set constraints on the charm coupling modifier, resulting in |κc| < 4.2 at 95% confidence level. Combining the H → bb and H → cc measurements constrains the absolute value of the ratio of Higgs-charm and Higgs-bottom coupling modifiers (|κc/κb|) to be less than 3.6 at 95% confidence level.