Measurements of $WH$ and $ZH$ production with Higgs boson decays into bottom quarks and direct constraints on the charm Yukawa coupling in $13\mathrm{TeV}$ $pp$ collisions with the ATLAS detector

Abstract

A study of the Higgs boson decaying into bottom quarks ($H\to b\bar{b}$) and charm quarks ($H\to c\bar{c}$) is performed, in the associated production channel of the Higgs boson with a $W$ or $Z$ boson, using $140{\mathrm{fb}}^{-1}$ of proton-proton collision data at $\sqrt{s}=13\mathrm{TeV}$ collected by the ATLAS detector. The individual production of $WH$ and $ZH$ with $H\to b\bar{b}$ 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 $H\to c\bar{c}$ 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 $|{\kappa }_c|<4.2$ at 95\% confidence level. Combining the $H\to b\bar{b}$ and $H\to c\bar{c}$ measurements constrains the absolute value of the ratio of Higgs-charm and Higgs-bottom coupling modifiers ($|{\kappa }_c/{\kappa }_b|$) to be less than $3.6$ at 95$\%$ confidence level.

arXiv comment69 pages in total, author list starting page 52, 18 figures, 8 tables, published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2020-20

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