First measurement of the CP-violating phase in B0s→ϕϕ decays

The LHCb Collaboration; Matthew Needham; Franz Muheim; Peter Clarke; Yuehong Xie; Stephan Eisenhardt

doi:10.1103/PhysRevLett.110.241802

First measurement of the CP-violating phase in B0s→ϕϕ decays

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

A first flavour-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-Bˉ0s mixing and the b→ssˉs gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0fb−1 and collected at a centre-of-mass energy of 7TeV with the LHCb detector, 880 B0s→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46, -0.76] rad at 68% confidence level. The p-value of the Standard Model prediction is 16%.

Original language	English
Article number	241802
Number of pages	8
Journal	Physical Review Letters
Volume	110
Issue number	24
Early online date	28 Mar 2013
DOIs	https://doi.org/10.1103/PhysRevLett.110.241802
Publication status	Published - 12 Jun 2013

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10.1103/PhysRevLett.110.241802

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title = "First measurement of the CP-violating phase in B0s→ϕϕ decays",

abstract = "A first flavour-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-Bˉ0s mixing and the b→ssˉs gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0fb−1 and collected at a centre-of-mass energy of 7TeV with the LHCb detector, 880 B0s→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46, -0.76] rad at 68\% confidence level. The p-value of the Standard Model prediction is 16\%.",

author = "Stephen Playfer and \{The LHCb Collaboration\} and Matthew Needham and Franz Muheim and Peter Clarke and Yuehong Xie and Stephan Eisenhardt",

year = "2013",

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T1 - First measurement of the CP-violating phase in B0s→ϕϕ decays

AU - Playfer, Stephen

AU - The LHCb Collaboration

AU - Needham, Matthew

AU - Muheim, Franz

AU - Clarke, Peter

AU - Xie, Yuehong

AU - Eisenhardt, Stephan

PY - 2013/6/12

Y1 - 2013/6/12

N2 - A first flavour-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-Bˉ0s mixing and the b→ssˉs gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0fb−1 and collected at a centre-of-mass energy of 7TeV with the LHCb detector, 880 B0s→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46, -0.76] rad at 68% confidence level. The p-value of the Standard Model prediction is 16%.

AB - A first flavour-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-Bˉ0s mixing and the b→ssˉs gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0fb−1 and collected at a centre-of-mass energy of 7TeV with the LHCb detector, 880 B0s→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46, -0.76] rad at 68% confidence level. The p-value of the Standard Model prediction is 16%.

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DO - 10.1103/PhysRevLett.110.241802

M3 - Article

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VL - 110

JO - Physical Review Letters

JF - Physical Review Letters

IS - 24

M1 - 241802

ER -

First measurement of the CP-violating phase in B0s→ϕϕ decays

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