Search for charge-parity violation in semileptonically tagged D0 → K+π− decays
DOI:
10.1007/jhep03(2025)149
Publication Date:
2025-03-23T06:46:21Z
AUTHORS (1152)
ABSTRACT
Abstract
An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D
0 → K
+
π
−
and D
0 → K
−
π
+ decay rates is measured as a function of the decay time of the D
0 meson and compared with the charge-conjugated system to search for charge-parity violation. The meson flavour at production is double-tagged by the charges of the muon and pion in the preceding
$$ \overline{B}\to {D}^{\ast }{(2010)}^{+}{\mu}^{-}X $$
B
¯
→
D
∗
2010
+
μ
−
X
and D
∗(2010)+ → D
0
π
+ decays, respectively. These decays are selected from proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 5.4 fb
−1. The flavour oscillation parameters, relating to the differences in mass and width of the mass eigenstates, are found to be y′ = (5.8 ± 1.6) × 10
−3 and (x′)2 = (0.0 ± 1.2) × 10
−4. No evidence for charge-parity violation is seen either in the flavour oscillations or in the decay, where the direct charge-parity asymmetry is measured to be A
D
= (2.3 ± 1.7) %.
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