Measurement of the CP-violating phase phi s in Bs->J/psi pi+pi- decays

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

doi:10.1016/j.physletb.2012.06.032

Measurement of the CP-violating phase phi s in Bs->J/psi pi+pi- 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

Measurement of the mixing-induced CP-violating phase phi s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/psi pi+pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of \phi s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.

Original language	English
Pages (from-to)	378-386
Number of pages	9
Journal	Physics Letters B
Volume	B713
Early online date	25 Apr 2012
DOIs	https://doi.org/10.1016/j.physletb.2012.06.032
Publication status	Published - 18 Jul 2012

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title = "Measurement of the CP-violating phase phi s in Bs->J/psi pi+pi- decays",

abstract = "Measurement of the mixing-induced CP-violating phase phi s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/psi pi+pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of \phi s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.",

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

year = "2012",

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doi = "10.1016/j.physletb.2012.06.032",

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journal = "Physics Letters B",

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T1 - Measurement of the CP-violating phase phi s in Bs->J/psi pi+pi- decays

AU - Playfer, Stephen

AU - The LHCb Collaboration

AU - Needham, Matthew

AU - Muheim, Franz

AU - Clarke, Peter

AU - Xie, Yuehong

AU - Eisenhardt, Stephan

PY - 2012/7/18

Y1 - 2012/7/18

N2 - Measurement of the mixing-induced CP-violating phase phi s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/psi pi+pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of \phi s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.

AB - Measurement of the mixing-induced CP-violating phase phi s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/psi pi+pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of \phi s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.

U2 - 10.1016/j.physletb.2012.06.032

DO - 10.1016/j.physletb.2012.06.032

M3 - Article

SN - 1873-2445

VL - B713

SP - 378

EP - 386

JO - Physics Letters B

JF - Physics Letters B

ER -

Measurement of the CP-violating phase phi s in Bs->J/psi pi+pi- decays

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