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Observation of the suppressed decay $\Lambda \ _b \ ^0 \to p \pi^- \mu^+ \mu^-$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Observation of the suppressed decay $\Lambda \ _b \ ^0 \to p \pi^- \mu^+ \mu^-$. Journal of High Energy Physics, 04:029.

Abstract

The suppressed decay $\Lambda \ _b \ ^0 \to p \pi^- \mu^+ \mu^-$, excluding the $J/ \psi$ and $\psi(2S) \to \mu^+ \mu^-$ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 $fb^{−1}$ collected with the LHCb experiment. The $\Lambda \ _b \ ^0 \to p \pi^- \mu^+ \mu^-$ branching fraction is measured relative to the $\Lambda \ _b \ ^0 \to J/ \psi (\to \mu^+ \mu^-)p \pi^-$ branching fraction giving
$\frac{\mathcal{B}(\Lambda_b^0 \to p \pi^*- \mu^+ \mu^-)}{\mathcal{B}(\Lambda_b^0 \to J/ \psi (\to \mu^+ \mu^-)p \pi^-)} = 0.044 \pm 0.012 \pm 0.007$,
where the first uncertainty is statistical and the second is systematic. This is the first observation of a $b \to d$ transition in a baryonic decay.

Abstract

The suppressed decay $\Lambda \ _b \ ^0 \to p \pi^- \mu^+ \mu^-$, excluding the $J/ \psi$ and $\psi(2S) \to \mu^+ \mu^-$ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 $fb^{−1}$ collected with the LHCb experiment. The $\Lambda \ _b \ ^0 \to p \pi^- \mu^+ \mu^-$ branching fraction is measured relative to the $\Lambda \ _b \ ^0 \to J/ \psi (\to \mu^+ \mu^-)p \pi^-$ branching fraction giving
$\frac{\mathcal{B}(\Lambda_b^0 \to p \pi^*- \mu^+ \mu^-)}{\mathcal{B}(\Lambda_b^0 \to J/ \psi (\to \mu^+ \mu^-)p \pi^-)} = 0.044 \pm 0.012 \pm 0.007$,
where the first uncertainty is statistical and the second is systematic. This is the first observation of a $b \to d$ transition in a baryonic decay.

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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:08 Feb 2018 14:01
Last Modified:19 Feb 2018 10:44
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/JHEP04(2017)029

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