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Amplitude analysis of the decay $\overline B^0 \to K_S^0 \pi^+ \pi^-$ and first observation of the CP asymmetry in $\overline B^0 \to K^*(892)^- \pi^+$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2018). Amplitude analysis of the decay $\overline B^0 \to K_S^0 \pi^+ \pi^-$ and first observation of the CP asymmetry in $\overline B^0 \to K^*(892)^- \pi^+$. Physical Review Letters, 120(26):261801.

Abstract

The time-integrated untagged Dalitz plot of the three-body hadronic charmless decay ¯B0→K0Sπ+π− is studied using a pp collision data sample recorded with the LHCb detector, corresponding to an integrated luminosity of 3.0  fb−1. The decay amplitude is described with an isobar model. Relative contributions of the isobar amplitudes to the ¯B0→K0Sπ+π− decay branching fraction and CP asymmetries of the flavor-specific amplitudes are measured. The CP asymmetry between the conjugate ¯B0→K∗(892)−π+ and B0→K∗(892)+π− decay rates is determined to be −0.308±0.062.

Abstract

The time-integrated untagged Dalitz plot of the three-body hadronic charmless decay ¯B0→K0Sπ+π− is studied using a pp collision data sample recorded with the LHCb detector, corresponding to an integrated luminosity of 3.0  fb−1. The decay amplitude is described with an isobar model. Relative contributions of the isobar amplitudes to the ¯B0→K0Sπ+π− decay branching fraction and CP asymmetries of the flavor-specific amplitudes are measured. The CP asymmetry between the conjugate ¯B0→K∗(892)−π+ and B0→K∗(892)+π− decay rates is determined to be −0.308±0.062.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:07 Mar 2019 13:15
Last Modified:26 Apr 2019 18:40
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevLett.120.261801

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