Search for the rare decays W⁺ -> D⁺_sγ and Z -> D^0γ at LHCbстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.
Аннотация:A search for the rare decays W+→D+sγ and Z→D0γ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 2.0 fb−1. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W+→μ+ν and Z→μ+μ− decays as normalization channels. The upper limits are 6.5×10−4 and 2.1×10−3 at 95% confidence level for the W+→D+sγ and Z→D0γ decay modes, respectively. This is the first reported search for the Z→D0γ decay, while the upper limit on the W+→D+sγ branching fraction improves upon the previous best limit.