Search for the rare decays and at LHCb



LHCb Collaboration, Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adeva, B, Adinolfi, M, Adlarson, P, Afsharnia, H
et al (show 1062 more authors) (2023) Search for the rare decays and at LHCb. Chinese Physics C, 47 (9). 093002-093002.

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Abstract

<jats:title>Abstract</jats:title> <jats:p>A search for the rare decays <jats:inline-formula> <jats:tex-math><?CDATA $W^{+} \rightarrow D_s^{+} \gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M3.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $Z \rightarrow D^0 \gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M4.jpg" xlink:type="simple" /> </jats:inline-formula> is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13<jats:inline-formula> <jats:tex-math><?CDATA $\mathrm{TeV}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M5.jpg" xlink:type="simple" /> </jats:inline-formula>, corresponding to an integrated luminosity of 2.0<jats:inline-formula> <jats:tex-math><?CDATA $\mathrm{fb}^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M6.jpg" xlink:type="simple" /> </jats:inline-formula>. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using <jats:inline-formula> <jats:tex-math><?CDATA $W^{+} \rightarrow \mu^{+} \nu$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M7.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $Z \rightarrow \mu^{+} \mu^{-}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M8.jpg" xlink:type="simple" /> </jats:inline-formula> decays as normalization channels. The upper limits are <jats:inline-formula> <jats:tex-math><?CDATA ${{{6.5\times 10^{-4}}}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M9.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA ${{{2.1\times 10^{-3}}}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M10.jpg" xlink:type="simple" /> </jats:inline-formula> at 95% confidence level for the <jats:inline-formula> <jats:tex-math><?CDATA $W^{+} \rightarrow D_s^{+} \gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M11.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $Z \rightarrow D^0 \gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M12.jpg" xlink:type="simple" /> </jats:inline-formula> decay modes, respectively. This is the first reported search for the <jats:inline-formula> <jats:tex-math><?CDATA $Z \rightarrow D^0 \gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M13.jpg" xlink:type="simple" /> </jats:inline-formula> decay, while the upper limit on the <jats:inline-formula> <jats:tex-math><?CDATA $W^{+} \rightarrow D_s^{+} \gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_9_093002_M14.jpg" xlink:type="simple" /> </jats:inline-formula> branching fraction improves upon the previous best limit.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 30 Nov 2023 12:47
Last Modified: 30 Nov 2023 12:47
DOI: 10.1088/1674-1137/aceae9
Open Access URL: https://iopscience.iop.org/article/10.1088/1674-11...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3177091