First measurement of the CP-violating phase in $B_s^0 \to \phi \phi$ decays - INSPIRE

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First measurement of the CP-violating phase in $B_s^0 \to \phi \phi$ decays

LHCb

Collaboration

Mar 28, 2013

8 pages

Published in:

Phys.Rev.Lett. 110 (2013) 24, 241802

Published: Jun 12, 2013

e-Print:

1303.7125 [hep-ex]

DOI:

10.1103/PhysRevLett.110.241802

PDG:

\mathit CP

Violation phase

\beta _{s}

{{\mathit b}}

\rightarrow

{{\mathit s}}{{\overline{\mathit s}}}{{\mathit s}}

Report number:

LHCB-PAPER-2013-007,
CERN-PH-EP-2013-046

Experiments:

CERN-LHC-LHCb

View in:

reference search62 citations

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Abstract: (APS)

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between Bs0-B¯s0 mixing and the b→ss¯s gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0 fb-1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 Bs0→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46,-0.76] rad at a 68% confidence level. The p value of the standard model prediction is 16%.

Note:

9 pages, 3 figures

13.25.Hw
11.30.Er
12.15.Hh
14.40.Nd
CP: violation
p p: scattering
asymmetry: time dependence
scattering amplitude: interference
amplitude analysis: penguin
LHC-B

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