| ATLAS Note | |
| Report number | ATLAS-CONF-2021-046 |
| Title | Study of the $B_c^+\to J/\psi D_s^+$ and $B_c^+\to J/\psi D_s^{*+}$ decays in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector |
| Corporate Author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Publication | 2021 |
| Imprint | 25 Aug 2021 |
| Number of pages | mult. |
| Note | All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2021-046 |
| In: | European Physics Society conference on High Energy Physics 2021, Online, Online, 26 - 30 Jul 2021 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Abstract | A study of the $B_c^+\to J/\psi D_s^+$ and $B_c^+\to J/\psi D_s^{*+}$ decays using 139 fb$^{-1}$ of integrated luminosity collected with the ATLAS detector from $\sqrt{s} = 13$ TeV $pp$ collisions at the LHC is presented. The ratios of the branching fractions of the two decays to the branching fraction of $B_c^+\to J/\psi \pi^+$ decay channel are measured: $\mathcal B(B_c^+\to J/\psi D_s^+)/\mathcal B(B_c^+\to J/\psi \pi^+) = 2.76\pm 0.47$, $\mathcal B(B_c^+\to J/\psi D_s^{*+})/\mathcal B(B_c^+\to J/\psi \pi^+) = 5.33\pm 0.96$. The ratio between the branching fractions of the two decays is found to be $\mathcal B(B_c^+\to J/\psi D_s^{*+})/\mathcal B(B_c^+\to J/\psi D_s^+) = 1.93\pm0.26$. For the $B_c^+\to J/\psi D_s^{*+}$ decay, the transverse polarisation fraction, $\Gamma_{\pm\pm}/\Gamma$, is measured to be $0.70\pm0.11$. Here the uncertainty is a quadratic sum of statistical and systematic contributions. The precision of the measurements exceeds that of all previous studies of these decays. A comparison with available theoretical predictions for the measured quantities is presented. |
| Related document | superseded by: CERN-EP-2022-025 |
Corresponding record in: Inspire
Record created 2021-08-25, last modified 2022-03-04
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