Search for $CP$ Violation in $B^{\pm} \to J / ψ K^{\pm}$ and $B^{\pm} \to ψ (2 S) K^{\pm}$ Decays

We present a search for direct

CP

violation in

B^{\pm} \to J / ψ K^{\pm}

and

B^{\pm} \to ψ (2 S) K^{\pm}

decays. In a sample of

9.7 \times 10^{6} B \bar{B}

meson pairs collected with the CLEO detector, we have fully reconstructed

534 B^{\pm} \to J / ψ K^{\pm}

and

120 B^{\pm} \to ψ (2 S) K^{\pm}

decays with very low background. We have measured the

CP

-violating charge asymmetry to be

[+ 1.8 \pm 4.3 (stat) \pm 0.4 (syst)] %

for

B^{\pm} \to J / ψ K^{\pm}

and

[+ 2.0 \pm 9.1 (stat) \pm 1.0 (syst)] %

for

B^{\pm} \to ψ (2 S) K^{\pm}

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Search forCPViolation inB±→J/ψK±andB±→ψ(2S)K±Decays