Observation of direct CP violation in D0 meson decays at LHCb

Betti, F. (2020) Observation of direct CP violation in D0 meson decays at LHCb. Il nuovo cimento C, 43 (2-3). pp. 1-6. ISSN 1826-9885

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Abstract

A search for charge-parity (CP) violation in D0 → K−K+ and D0 → π−π+ decays is reported, using pp collision data corresponding to an integrated luminosity of 5.9 fb−1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the D0 meson is determined from the charge of the pion in D∗(2010)+ → D0π+ decays or from the charge of the muon in B → D0μ−ν¯μX decays. The difference between the CP asymmetries in D0 → K−K+ and D0 → π−π+ decays is measured to be ΔACP = [−18.2 ± 3.2 (stat.) ± 0.9 (syst.)] × 10−4 for πtagged and ΔACP = [−9±8 (stat.)±5 (syst.)]×10−4 for μ-tagged D0 mesons. The combination with previous LHCb results leads to ΔACP = (−15.4 ± 2.9) × 10−4, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than five standard deviations, corresponding to the first observation of CP violation in the decay of charm hadrons.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	04 Feb 2021 15:18
Last Modified:	04 Feb 2021 15:18
URI:	http://eprints.bice.rm.cnr.it/id/eprint/20766

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