Study of $B^{\pm} \to J / ψ π^{\pm}$ and $B^{\pm} \to J / ψ K^{\pm}$ decays: Measurement of the ratio of branching fractions and search for direct CP-violating charge asymmetries

We have studied the

B^{\pm} \to J / ψ π^{\pm}

and

B^{\pm} \to J / ψ K^{\pm}

decays using a 20.7

{fb}^{- 1}

data set collected with the BABAR detector. We observe a signal of

51 \pm 10

B^{\pm} \to J / ψ π^{\pm}

events and determine the ratio

B {(B}^{\pm} \to J / ψ π^{\pm}) / B {(B}^{\pm} \to J / ψ K^{\pm})

to be

[3.91 \pm 0.78 (stat) \pm 0.19 (syst)] % .

The CP-violating charge asymmetries for the

B^{\pm} \to J / ψ π^{\pm}

and

B^{\pm} \to J / ψ K^{\pm}

decays are determined to be

A_{π} = 0.01 \pm 0.22 (stat) \pm 0.01 (syst)

and

A_{K} = 0.003 \pm 0.030 (stat) \pm 0.004 (syst) .

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Study of B±→J/ψπ± and B±→J/ψK± decays: Measurement of the ratio of branching fractions and search for direct CP-violating charge asymmetries