Measurement of CP asymmetry in $B^0_s \rightarrow D^{\mp}_s K^{\pm}$ decays - INSPIRE

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Measurement of CP asymmetry in $B^0_s \rightarrow D^{\mp}_s K^{\pm}$ decays

LHCb

Collaboration

Jul 23, 2014

31 pages

Published in:

JHEP 11 (2014) 060

Published: Nov 13, 2014

e-Print:

1407.6127 [hep-ex]

DOI:

10.1007/JHEP11(2014)060

PDG:

\gamma

Report number:

LHCB-PAPER-2014-038,
CERN-PH-EP-2014-168

Experiments:

CERN-LHC-LHCb

View in:

reference search67 citations

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Abstract: (Springer)

We report on measurements of the time-dependent CP violating observables in B

_{s}^{0}

→ D

_{s}^{∓}

K

^{±}

decays using a dataset corresponding to 1.0 fb

^{−1}

of pp collisions recorded with the LHCb detector. We find the CP violating observables C

_{f}

= 0.53±0.25±0.04, A

_{f}^{ΔΓ}

= 0.37 ± 0.42 ± 0.20,

{A}_{\overline{f}}^{\varDelta \varGamma }=0.20\pm 0.41\pm 0.20

, S

_{f}

= −1.09±0.33±0.08,

{S}_{\overline{f}}=-0.36\pm 0.34\pm 0.08

, where the uncertainties are statistical and systematic, respectively. Using these observables together with a recent measurement of the B

_{s}^{0}

mixing phase −2β

_{s}

leads to the first extraction of the CKM angle γ from B

_{s}^{0}

→ D

_{s}^{∓}

K

^{±}

decays, finding γ = (115

_{− 43}^{+ 28}

)° modulo 180° at 68% CL, where the error contains both statistical and systematic uncertainties.

Note:

31 pages, 7 figures

CP violation
CKM angle gamma
B physics
Flavor physics
Hadron-Hadron Scattering
CP: violation
time dependence
asymmetry: CP: measured
p p: scattering
CKM matrix: unitarity

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