Measurement of CP-violating and mixing-induced observables in B0s → φγ decays

Peter Clarke; Robert Currie; Stephan Eisenhardt; Silvia Gambetta; Franz Muheim; Matthew Needham; Marco Pappagallo; Mark Williams; LHCb Collaboration

doi:10.1103/PhysRevLett.123.081802

Measurement of CP-violating and mixing-induced observables in B⁰_s → φγ decays

Peter Clarke, Robert Currie, Stephan Eisenhardt, Silvia Gambetta, Franz Muheim, Matthew Needham, Marco Pappagallo, Mark Williams, LHCb Collaboration

School of Physics and Astronomy

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

Abstract

A time-dependent analysis of the Bs0→ϕγ decay rate is performed to determine the CP -violating observables Sϕγ and Cϕγ and the mixing-induced observable AϕγΔ. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3 fb-1 at center-of-mass energies of 7 and 8 TeV. The measured values are Sϕγ=0.43±0.30±0.11, Cϕγ=0.11±0.29±0.11, and AϕγΔ=-0.67-0.41+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative Bs0 decays. The results are consistent with the standard model predictions.

Original language	English
Article number	081802
Journal	Physical Review Letters
Volume	123
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.123.081802
Publication status	Published - 23 Aug 2019

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10.1103/PhysRevLett.123.081802

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title = "Measurement of CP-violating and mixing-induced observables in B0s → φγ decays",

abstract = "A time-dependent analysis of the Bs0→ϕγ decay rate is performed to determine the CP -violating observables Sϕγ and Cϕγ and the mixing-induced observable AϕγΔ. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3 fb-1 at center-of-mass energies of 7 and 8 TeV. The measured values are Sϕγ=0.43±0.30±0.11, Cϕγ=0.11±0.29±0.11, and AϕγΔ=-0.67-0.41+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative Bs0 decays. The results are consistent with the standard model predictions.",

author = "Peter Clarke and Robert Currie and Stephan Eisenhardt and Silvia Gambetta and Franz Muheim and Matthew Needham and Marco Pappagallo and Mark Williams and LHCb Collaboration",

note = "Acceptance date not found on publisher site. Used date received.",

year = "2019",

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day = "23",

doi = "10.1103/PhysRevLett.123.081802",

language = "English",

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TY - JOUR

T1 - Measurement of CP-violating and mixing-induced observables in B0s → φγ decays

AU - Clarke, Peter

AU - Currie, Robert

AU - Eisenhardt, Stephan

AU - Gambetta, Silvia

AU - Muheim, Franz

AU - Needham, Matthew

AU - Pappagallo, Marco

AU - Williams, Mark

AU - Collaboration, LHCb

N1 - Acceptance date not found on publisher site. Used date received.

PY - 2019/8/23

Y1 - 2019/8/23

N2 - A time-dependent analysis of the Bs0→ϕγ decay rate is performed to determine the CP -violating observables Sϕγ and Cϕγ and the mixing-induced observable AϕγΔ. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3 fb-1 at center-of-mass energies of 7 and 8 TeV. The measured values are Sϕγ=0.43±0.30±0.11, Cϕγ=0.11±0.29±0.11, and AϕγΔ=-0.67-0.41+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative Bs0 decays. The results are consistent with the standard model predictions.

AB - A time-dependent analysis of the Bs0→ϕγ decay rate is performed to determine the CP -violating observables Sϕγ and Cϕγ and the mixing-induced observable AϕγΔ. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3 fb-1 at center-of-mass energies of 7 and 8 TeV. The measured values are Sϕγ=0.43±0.30±0.11, Cϕγ=0.11±0.29±0.11, and AϕγΔ=-0.67-0.41+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative Bs0 decays. The results are consistent with the standard model predictions.

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DO - 10.1103/PhysRevLett.123.081802

M3 - Article

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VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 081802

ER -

Measurement of CP-violating and mixing-induced observables in B0s → φγ decays

Abstract

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Measurement of CP-violating and mixing-induced observables in B⁰_s → φγ decays