| ATLAS Note | |
| Report number | ATLAS-CONF-2024-010 |
| Title | Measurements of W H and Z H Higgs production with decays into bottom quarks and direct constraints on the charm Yukawa coupling with 13 TeV collisions in the ATLAS detector. |
| Corporate Author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Publication | 2024 |
| Imprint | 23 Jul 2024 |
| Number of pages | mult. |
| Note | All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2024-010 |
| In: | 10th International Conference on High-energy Physics, Rochester, NY, USA, 25 Aug - 1 Sep 1960 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Free keywords | Higgs ; VH ; Hbb ; Hcc ; kappac ; STXS ; boosted |
| 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 $4.9$ ($5.7$). 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 measurements are consistent with the Standard Model expectations, and the uncertainties vary from 25% in the most sensitive regions to 100% in the regions with low or high gauge boson transverse momentum. The search for the $H \to c\bar{c}$ decay yields an observed (expected) upper limit of $11.3$ ($10.4$) times the Standard Model prediction. The results are also used to put constraints on a charm Yukawa coupling modifier $|\kappa_c| < 4.2$ at the 95% confidence level. Combining the $H \to b\bar{b}$ and $H \to c\bar{c}$ measurements constrains the ratio between the coupling of the Higgs boson to $c$ and $b$ quarks ($\kappa_c/\kappa_b$) to be less than $3.5$ at the 95% confidence level. The analysis method is validated with the measurement of the $VZ$ process where $V$ is a $W$ or $Z$ boson. The $WZ$, $Z \to b\bar{b}$, $ZZ$, $Z \to b\bar{b}$, and $VZ$, $Z \to c\bar{c}$ processes are observed with high significance and found in agreement with the Standard Model predictions. |
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Záznam vytvorený 2024-07-23, zmenený 2024-07-24