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Search for the rare decays $W⁺ \to D⁺_s\gamma$ and $Z \to D⁰\gamma$ at LHCb


LHCb Collaboration; Bernet, R; Müller, K; Owen, P; Serra, N; Steinkamp, O; et al (2023). Search for the rare decays $W⁺ \to D⁺_s\gamma$ and $Z \to D⁰\gamma$ at LHCb. Chinese Physics C, 47(9):093002.

Abstract

A search for the rare decays $W^{+} \rightarrow D_s^{+} \gamma$ and $Z \rightarrow D^0 \gamma$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13$\mathrm{TeV}$, corresponding to an integrated luminosity of 2.0$\mathrm{fb}^{-1}$. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using $W^{+} \rightarrow \mu^{+} \nu$ and $Z \rightarrow \mu^{+} \mu^{-}$ decays as normalization channels. The upper limits are ${{{6.5\times 10^{-4}}}}$ and ${{{2.1\times 10^{-3}}}}$ at 95% confidence level for the $W^{+} \rightarrow D_s^{+} \gamma$ and $Z \rightarrow D^0 \gamma$ decay modes, respectively. This is the first reported search for the $Z \rightarrow D^0 \gamma$ decay, while the upper limit on the $W^{+} \rightarrow D_s^{+} \gamma$ branching fraction improves upon the previous best limit.

Abstract

A search for the rare decays $W^{+} \rightarrow D_s^{+} \gamma$ and $Z \rightarrow D^0 \gamma$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13$\mathrm{TeV}$, corresponding to an integrated luminosity of 2.0$\mathrm{fb}^{-1}$. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using $W^{+} \rightarrow \mu^{+} \nu$ and $Z \rightarrow \mu^{+} \mu^{-}$ decays as normalization channels. The upper limits are ${{{6.5\times 10^{-4}}}}$ and ${{{2.1\times 10^{-3}}}}$ at 95% confidence level for the $W^{+} \rightarrow D_s^{+} \gamma$ and $Z \rightarrow D^0 \gamma$ decay modes, respectively. This is the first reported search for the $Z \rightarrow D^0 \gamma$ decay, while the upper limit on the $W^{+} \rightarrow D_s^{+} \gamma$ branching fraction improves upon the previous best limit.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Physical Sciences > Instrumentation
Physical Sciences > Astronomy and Astrophysics
Language:English
Date:2023
Deposited On:20 Jan 2024 15:21
Last Modified:30 Jun 2024 01:37
Publisher:IOP Publishing
ISSN:1674-1137
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1088/1674-1137/aceae9
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 3.0 Unported (CC BY 3.0)