6 Aralık 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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    <subfield code="a">&lt;p&gt;A search is reported for charge-parity     $\mathrm{CP}$   violation in     ${\text{D}}^{0}\to {\text{K}}_{\text{S}}^{0}{\text{K}}_{\text{S}}^{0}$   decays, using data collected in proton–proton collisions at     $\sqrt{s}=13\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$   recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6    $\phantom{\rule{0.166667em}{0ex}}{\text{fb}}^{-1}$  , which consists of about 10 billion events containing a pair of b hadrons, nearly all of which decay to charm hadrons. The flavor of the neutral D meson is determined by the pion charge in the reconstructed decays     $\text{D}_{}^{\ast +}\to {\text{D}}^{0}{\pi }^{+}$   and     $\text{D}_{}^{\ast -}\to {\overline{\text{D}}}^{0}{\pi }^{-}$  . The     $\mathrm{CP}$   asymmetry in     ${\text{D}}^{0}\to {\text{K}}_{\text{S}}^{0}{\text{K}}_{\text{S}}^{0}$   is measured to be     ${A}_{\mathrm{CP}}\left({\text{K}}_{\text{S}}^{0}{\text{K}}_{\text{S}}^{0}\right)=\left(6.2±3.0±0.2±0.8\right)%$  , where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the     $\mathrm{CP}$   asymmetry in the     ${\text{D}}^{0}\to {\text{K}}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}$   decay. This is the first     $\mathrm{CP}$   asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.&lt;/p&gt;</subfield>
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    <subfield code="a">Search for CP violation in     ${\text{D}}^{0}\to {\text{K}}_{\text{S}}^{0}{\text{K}}_{\text{S}}^{0}$   decays in proton–proton collisions at     $\sqrt{s}=13\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$</subfield>
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