Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays

Abstract

Time-integrated $CP$ asymmetries in $D^0$ decays to the final states $K^{-}{K}^{+}$ and ${\pi }^{-}{\pi }^{+}$ are measured using proton-proton collisions corresponding to $3{\mathrm{fb}}^{-1}$ of integrated luminosity collected at centre-of-mass energies of $7\mathrm{Te}\mathrm{V}$ and $8\mathrm{Te}\mathrm{V}$. The $D^0$ mesons are produced in semileptonic $b$-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in $CP$ asymmetries between the two final states is measured to be \begin{align} ΔA_{CP} = A_{CP}(K^-K^+)-A_{CP}(π^-π^+) = (+0.14 \pm 0.16\mathrm{\,(stat)} \pm 0.08\mathrm{\,(syst)})\% \ . \nonumber \end{align} A measurement of $A_{CP}(K^{-}{K}^{+})$ is obtained assuming negligible $CP$ violation in charm mixing and in Cabibbo-favoured $D$ decays. It is found to be \begin{align} A_{CP}(K^-K^+) = (-0.06 \pm 0.15\mathrm{\,(stat)} \pm 0.10\mathrm{\,(syst)}) \% \ ,\nonumber \end{align} where the correlation coefficient between $\Delta A_{CP}$ and $A_{CP}(K^{-}{K}^{+})$ is $\rho =0.28$. By combining these results, the $CP$ asymmetry in the $D^0\to {\pi }^{-}{\pi }^{+}$ channel is $A_{CP}({\pi }^{-}{\pi }^{+})=(-0.20\pm 0.19(\mathrm{stat})\pm 0.10(\mathrm{syst}))\%$.

19 pages, 5 figures

References in corpus (3)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Measurement of the difference of CP-violating asymmetries in D0 -> K+K- and D0 ->pi+pi- decays at CDF
• Measurement of the D+/- production asymmetry in 7 TeV pp collisions

Cited by in corpus (34)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Observation of $CP$ violation in charm decays
• Revisiting CP violation in $D\to PP$ and $VP$ decays
• The Relic Neutralino Surface at a 100 TeV collider
• On $SU(3{)}_F$ Breaking through Final State Interactions and CP Asymmetries in $D\to PP$ Decays
• Measurement of the semileptonic $CP$ asymmetry in $B^0-\overline{B}{}^0$ mixing
• Observation of the ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decay
• Mixing and $CP$ violation in the charm system
• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ decays
• Charm CPV: observation and prospects
• CP violation in the B system
• Direct CP violation in beauty and charm hadron decays
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• $CP$ asymmetries in charm decays into neutral kaons
• Search for time-dependent $CP$ violation in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays
• Search for $CP$ violation in ${\Xi }_c^{+}\to p{K}^{-}{\pi }^{+}$ decays using model-independent techniques
• Flavor Physics and CP Violation
• Search for $CP$ violation in ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decays
• Study of $\itΛ_{\it{b}}^\rm{0}$ and $\itΞ_{\it{b}}^\rm{0}$ decays to $\Lambda h^{+}{h}^{{}^{\prime }-}$ and evidence for $CP$ violation in $\itΛ_{\it{b}}^\rm{0}\to\itΛ K^+K^-$ decays
• Observation of a ${\Lambda }_b^0-{\overline{\Lambda }}_b^0$ production asymmetry in proton-proton collisions at $\sqrt{s}=7\text{ and }8\text{TeV}$
• Search for $CP$ violation in $D_s^{+}\to K_S^0{\pi }^{+}$, $D^{+}\to K_S^0{K}^{+}$ and $D^{+}\to \varphi {\pi }^{+}$ decays
• Angular analysis of $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays and search for $CP$ violation
• Heavy Flavour Physics at the LHC
• Search for $CP$ violation in $D_{(s)}^{+}\to h^{+}{\pi }^0$ and $D_{(s)}^{+}\to h^{+}\eta$ decays
• Measurement of $CP$ asymmetries in ${\Lambda }_b^0\to p{h}^{-}$ decays
• Probing the electromagnetic dipole moments of the tau-neutrino in the $U(1{)}_{B-L}$ model at the ILC and CLIC energies
• Measurement of the direct CP-violating parameter A_CP in the decay D+ -> K- pi+ pi+
• Search for resonance-enhanced $CP$ and angular asymmetries in the ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay at LHCb
• CP Violation In Baryon Decays At LHCb
• Measurement of the CP asymmetry in $D^{+}\to {\pi }^{+}{\pi }^0$ decays at Belle II
• Study of CP Violation in $D^{\pm }\to K^{\ast }(892{)}^0{\pi }^{\pm }+{\bar{K}}^{\ast }(892{)}^0{\pi }^{\pm }\to K_{S,L}^0{\pi }^0{\pi }^{\pm }$ Decays
• A Review of $CP$ Violation Measurements in Charm at LHCb
• CP violation in quasi-two-body $D\to VP$ decays and three-body $D$ decays mediated by vector resonances
• Glauber gluons in annihilation amplitudes for heavy meson decays