Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Higgs Physics
Constraints on the Higgs-charm coupling by CMS
A. Pozdnyakov
Full text: pdf
Pre-published on: October 26, 2022
Published on:
Abstract
The discovery of the Higgs (H) boson ten years ago and
successful measurements of its couplings to third generation
fermions by ATLAS and CMS experiments mark great milestones for the
field of High Energy Physics. The much weaker coupling of the H
boson to second generation quarks predicted by the standard model
(SM) makes the measurement of the H-charm coupling much more
challenging. With the full Run-2 data collected at the LHC a lot of
progress has been made by the CMS Collaboration to constrain this
coupling. In this report I present the latest results of the direct
and indirect measurements of the H-charm coupling by CMS. Direct
measurements are performed by searching for the $H \to c\bar{c}$
decay. It is done in gluon fusion and VH production modes with
stronger limits coming from VH mode, $\mu_{VH(H\to c\bar{c})}<14.4$
at 95% CL. In the ggH channel the limit is set at $\mu_{ggH(H\to c\bar{c})}<45$. Indirect constraints on the charm coupling come
from the measurement of the H boson $p_T$ distribution, which leads
to a limit of $\vert\kappa_c\vert<35$. A rare H boson decay, $H \to J/\psi \gamma$, is also searched for at CMS, though giving a limited
sensitivity of $\sim220$ x SM. Prospects for future measurements at
HL-LHC are also discussed. From the projections it seems feasible to
constrain the H-charm coupling better than 2 times the SM value.
DOI: https://doi.org/10.22323/1.414.0505
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