A search is reported for charge-parity CP violation in D0→KS0KS0 decays, using data collected in proton-proton collisions at s=13TeV recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6 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 D∗+→D0π+ and D∗-→D¯0π- . The CP asymmetry in D0→KS0KS0 is measured to be ACP(KS0KS0)=(6.2±3.0±0.2±0.8)% , where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the CP asymmetry in the D0→KS0π+π- decay. This is the first CP asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.

Search for CP violation in D0→K0SK0S decays in proton–proton collisions at √s=13TeV

Abbrescia, M.;Colaleo, A.;D'Anzi, B.;Louka, M.;My, S.;Pompili, A.;Radogna, R.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;
2024-01-01

Abstract

A search is reported for charge-parity CP violation in D0→KS0KS0 decays, using data collected in proton-proton collisions at s=13TeV recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6 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 D∗+→D0π+ and D∗-→D¯0π- . The CP asymmetry in D0→KS0KS0 is measured to be ACP(KS0KS0)=(6.2±3.0±0.2±0.8)% , where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the CP asymmetry in the D0→KS0π+π- decay. This is the first CP asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/531161
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