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

A bstract A study of the Higgs boson decaying into bottom quarks ( H → $$ b\overline{b} $$ b b ¯ ) and charm quarks ( H → $$ c\overline{c} $$ c c ¯ ) 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 $$ \sqrt{s} $$ s = 13 TeV collected by the ATLAS detector. The individual production of WH and ZH with H → $$ b\overline{b} $$ b 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 → $$ c\overline{c} $$ c 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 |κ c | < 4 . 2 at 95% confidence level. Combining the H → $$ b\overline{b} $$ b b ¯ and H → $$ c\overline{c} $$ c c ¯ measurements constrains the absolute value of the ratio of Higgs-charm and Higgs-bottom coupling modifiers (| κ c /κ b |) to be less than 3 . 6 at 95% confidence level.

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