Study of direct CP violation in $B^{\pm }\to J/\psi K^{\pm }({\pi }^{\pm })$ decays

Abstract

We present a search for direct CP violation in $B^{\pm }\to J/\psi K^{\pm }({\pi }^{\pm })$ decays. The event sample is selected from 2.8 fb${}^{-1}$ of $p\bar{p}$ collisions recorded by D0 experiment in Run II of the Fermilab Tevatron Collider. The charge asymmetry $A_{CP}(B^{+}\to J/\psi K^{+})=+0.0075\pm 0.0061$(stat.)$\pm 0.0027$(syst.) is obtained using a sample of approximately 40 thousand $B^{\pm }\to J/\psi K^{\pm }$ decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. We also measured the charge asymmetry $A_{CP}(B^{+}\to J/\psi {\pi }^{+})=-0.09\pm 0.08$(stat.)$\pm 0.03$(syst.).

arXiv comment7 pages, 3 figures

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Cited by in corpus (14)

• Evidence for an anomalous like-sign dimuon charge asymmetry
• Measurement of the Bc meson mass in the exclusive decay Bc --> Jpsi Pi
• Measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays
• Search for CP violation in semileptonic Bs decays
• Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays
• Measurement of direct CP violation parameters in B^+/- -> J/ψK^+/- and B^+/- ->J/psi pi^+/- decays with 10.4 fb^-1 of Tevatron data
• Search for CP violating charge asymmetry in B^+ -> J/psi K^+ decays
• Search for TeV Scale Physics in Heavy Flavour Decays
• Measurement of the CP-violation Parameter sin2${\varphi }_1$ with a New Tagging Method at the ${\rm Y}(5S)$ Resonance
• B-physics results from Tevatron
• Review of Physics Results from the Tevatron: Heavy Flavor Physics
• Measurement of B_s Oscillations and CP Violation Results from D0
• Bs Mixing, DeltaGamma_s and CP Violation
• CP parameters of the B systems from Tevatron