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Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays $B^+ \to J/\psi\pi^+$ and $B^+ \to J/\psi K^+$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays $B^+ \to J/\psi\pi^+$ and $B^+ \to J/\psi K^+$. Journal of High Energy Physics, 3:36.

Abstract

The ratio of branching fractions and the difference in CP asymmetries of the decays $B^+ \to J/\psi\pi^+$ and $B^+ \to J/\psi K^+$ are measured using a data sample of pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 3 fb$^{−1}$ at centre-of-mass energies of 7 and 8 TeV. The results are
$\frac{\mathcal{B} (B^+ \to J/\psi\pi^+)} {\mathcal{B} (B^+ \to J/psi K^+)} = (3.83 \pm 0.03 \pm 0.03) \times 10^{−2}$,

$\mathcal{A}^{CP} (B^+ \to J/\psi\pi^+) − \mathcal{A}^{CP} (B^+ \to J/\psi K^+) = (1.82 \pm 0.86 \pm 0.14) \times 10^{−2}$,
where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of $\mathcal{A}^{CP} (B^+ \to J/\psi K^+)$ provides the most precise estimate to date of CP violation in the decay $B^+ \to J/\psi\pi^+$,
$\mathcal{A}^{CP}(B^+ \to J/\psi\pi^+) = (1.91 \pm 0.89 \pm 0.16) \times 10^{−2}$.

Abstract

The ratio of branching fractions and the difference in CP asymmetries of the decays $B^+ \to J/\psi\pi^+$ and $B^+ \to J/\psi K^+$ are measured using a data sample of pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 3 fb$^{−1}$ at centre-of-mass energies of 7 and 8 TeV. The results are
$\frac{\mathcal{B} (B^+ \to J/\psi\pi^+)} {\mathcal{B} (B^+ \to J/psi K^+)} = (3.83 \pm 0.03 \pm 0.03) \times 10^{−2}$,

$\mathcal{A}^{CP} (B^+ \to J/\psi\pi^+) − \mathcal{A}^{CP} (B^+ \to J/\psi K^+) = (1.82 \pm 0.86 \pm 0.14) \times 10^{−2}$,
where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of $\mathcal{A}^{CP} (B^+ \to J/\psi K^+)$ provides the most precise estimate to date of CP violation in the decay $B^+ \to J/\psi\pi^+$,
$\mathcal{A}^{CP}(B^+ \to J/\psi\pi^+) = (1.91 \pm 0.89 \pm 0.16) \times 10^{−2}$.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:06 Feb 2018 13:14
Last Modified:19 Feb 2018 10:45
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP03(2017)036

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