Search for $CP$ violation in $D_s^{+}\to K_S^0{\pi }^{+}$, $D^{+}\to K_S^0{K}^{+}$ and $D^{+}\to \varphi {\pi }^{+}$ decays

Abstract

A search for charge-parity ($CP$) violation in Cabibbo-suppressed $D_s^{+}\to K_S^0{\pi }^{+}$, $D^{+}\to K_S^0{K}^{+}$ and $D^{+}\to \varphi {\pi }^{+}$ decays is reported using proton-proton collision data, corresponding to an integrated luminosity of 3.8 fb${}^{-1}$, collected at a center-of-mass energy of 13 TeV with the LHCb detector. High-yield samples of kinematically and topologically similar Cabibbo-favored $D_{(s)}^{+}$ decays are analyzed to subtract nuisance asymmetries due to production and detection effects, including those induced by $CP$ violation in the neutral kaon system. The results are \begin{align*} \mathcal{A}_{CP}(D_s^+\to K_S^0 π^+) &=\left(\phantom{-}1.3\phantom{0}\pm1.9\phantom{0}\pm0.5\phantom{0}\right)\times10^{-3},\\ \mathcal{A}_{CP}(D^+\to K_S^0 K^+) &=\left(-0.09\pm0.65\pm0.48\right)\times10^{-3},\\ \mathcal{A}_{CP}(D^+\to ϕπ^+) &=\left(\phantom{-}0.05\pm0.42\pm0.29\right)\times10^{-3}, \end{align*} where the first uncertainties are statistical and the second systematic. They are the most precise measurements of these quantities to date, and are consistent with $CP$ symmetry.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-002.html

References in corpus (10)

• Observation of $CP$ violation in charm decays
• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Branching ratios and direct CP asymmetries in $D\to PP$ decays
• Charm Meson Decays
• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Measurement of the D+/- production asymmetry in 7 TeV pp collisions
• $CP$ asymmetries in charm decays into neutral kaons
• Search for CP Violation in the Decay $D^{+}\to K_S^0{K}^{+}$
• Search for CP violation in the Decays $D^{\pm }\to K_S^0{K}^{\pm }$, $D_s^{\pm }\to K_S^0{K}^{\pm }$, and $D_s^{\pm }\to K_S^0{\pi }^{\pm }$
• Search for direct CP-violation in singly-Cabibbo suppressed D+- --> K+ K- pi+- decays

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• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Search for $CP$ violation in $D_{(s)}^{+}\to h^{+}{\pi }^0$ and $D_{(s)}^{+}\to h^{+}\eta$ decays
• Recent advances in charm mixing and $CP$ violation at LHCb
• Measurement of $CP$ violation observables in $D^{+}\to K^{-}{K}^{+}{\pi }^{+}$ decays
• Effect of $K^0-{\bar{K}}^0$ Mixing on CP and CPT Violations in $B_c^{\pm }\to B^{\pm }{K}_{S,L}^0$ Decays
• A Review of $CP$ Violation Measurements in Charm at LHCb