6 Aralık 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>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\u2013proton 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     ${A}_{\\mathrm{CP}}\\left({\\text{K}}_{\\text{S}}^{0}{\\text{K}}_{\\text{S}}^{0}\\right)=\\left(6.2\u00b13.0\u00b10.2\u00b10.8\\right)%$  , 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.</p>", 
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      "title": "European Physical Journal C", 
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    "title": "Search for CP violation in     ${\\text{D}}^{0}\\to {\\text{K}}_{\\text{S}}^{0}{\\text{K}}_{\\text{S}}^{0}$   decays in proton\u2013proton collisions at     $\\sqrt{s}=13\\phantom{\\rule{0.166667em}{0ex}}\\text{Te}\\phantom{\\rule{-0.80002pt}{0ex}}\\text{V}$"
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