Measurement of the CP violating phase phi_s in B^0_s –> J/psi f_0(980)

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

doi:10.1016/j.physletb.2012.01.017

Measurement of the CP violating phase phi_s in B^0_s –> J/psi f_0(980)

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 mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\psi \phi\ has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\psi\phi\ yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02 rad, consistent with the Standard Model expectation.

Original language	English
Pages (from-to)	497-505
Number of pages	9
Journal	Physics Letters B
Volume	707
Issue number	5
Early online date	13 Dec 2011
DOIs	https://doi.org/10.1016/j.physletb.2012.01.017
Publication status	Published - 7 Feb 2012

Keywords / Materials (for Non-textual outputs)

LHC
CP violation
Hadronic B decays
meson

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10.1016/j.physletb.2012.01.017

http://www.sciencedirect.com/science/article/pii/S0370269312000305

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title = "Measurement of the CP violating phase phi\_s in B\textasciicircum{}0\_s –> J/psi f\_0(980)",

abstract = "Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\textbackslash{}psi \textbackslash{}phi\textbackslash{} has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\textbackslash{}psi f0(980), where f0(980)->\textbackslash{}pi+ \textbackslash{}pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\textbackslash{}psi\textbackslash{}phi\textbackslash{} yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02 rad, consistent with the Standard Model expectation.",

keywords = "LHC, CP violation, Hadronic B decays, meson",

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.2012.01.017",

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journal = "Physics Letters B",

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T1 - Measurement of the CP violating phase phi_s in B^0_s –> J/psi f_0(980)

AU - Playfer, Stephen

AU - The LHCb Collaboration

AU - Needham, Matthew

AU - Muheim, Franz

AU - Clarke, Peter

AU - Xie, Yuehong

AU - Eisenhardt, Stephan

PY - 2012/2/7

Y1 - 2012/2/7

N2 - Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\psi \phi\ has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\psi\phi\ yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02 rad, consistent with the Standard Model expectation.

AB - Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\psi \phi\ has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\psi\phi\ yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02 rad, consistent with the Standard Model expectation.

KW - LHC

KW - CP violation

KW - Hadronic B decays

KW - meson

U2 - 10.1016/j.physletb.2012.01.017

DO - 10.1016/j.physletb.2012.01.017

M3 - Article

SN - 1873-2445

VL - 707

SP - 497

EP - 505

JO - Physics Letters B

JF - Physics Letters B

IS - 5

ER -

Measurement of the CP violating phase phi_s in B^0_s –> J/psi f_0(980)

Abstract

Keywords / Materials (for Non-textual outputs)

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