Observation of the decay Λb        0 → pK − μ + μ − and a search for CP violation

The Lhcb Collaboration

doi:10.1007/JHEP06(2017)108

Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation

The Lhcb Collaboration

Department of Physics

Research output: Contribution to journal › Article

7 Citations (Scopus)

Abstract

A search for CP violation in the decay Λ_b ⁰ → pK⁻μ⁺μ⁻ is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb⁻¹. The Λ_b ⁰ → pK⁻μ⁺μ⁻ decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ⁺μ⁻ and pK⁻ decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].

Original language	English (US)
Journal	Journal of High Energy Physics
Volume	2017
Issue number	6
DOIs	https://doi.org/10.1007/JHEP06(2017)108
State	Published - Jun 1 2017

Fingerprint

CP violation

decay

protons

neutral currents

luminosity

asymmetry

collisions

Keywords

B physics
CP violation
FCNC Interaction
Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

The Lhcb Collaboration (2017). Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation. Journal of High Energy Physics, 2017(6). https://doi.org/10.1007/JHEP06(2017)108

Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation. / The Lhcb Collaboration.

In: Journal of High Energy Physics, Vol. 2017, No. 6, 01.06.2017.

Research output: Contribution to journal › Article

The Lhcb Collaboration 2017, 'Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation', Journal of High Energy Physics, vol. 2017, no. 6. https://doi.org/10.1007/JHEP06(2017)108

The Lhcb Collaboration. Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation. Journal of High Energy Physics. 2017 Jun 1;2017(6). https://doi.org/10.1007/JHEP06(2017)108

The Lhcb Collaboration. / Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation. In: Journal of High Energy Physics. 2017 ; Vol. 2017, No. 6.

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abstract = "A search for CP violation in the decay Λb 0 → pK−μ+μ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb 0 → pK−μ+μ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ+μ− and pK− decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].",

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Access to Document

10.1007/JHEP06(2017)108