Measurement of CP asymmetry in Bs0 → Ds∓K± decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
March 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2018 Mar 12;2018(3):59
Aaij, R., B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of CP Asymmetry in Bs0 → Ds∓K± Decays.” Journal of High Energy Physics 2018, no. 3 (March 2018). doi:10.1007/jhep03(2018)059.
Version
Final published version
Abstract
Abstract
We report the measurements of the CP -violating parameters in B
s
0
→ D
s
∓
K± decays observed in pp collisions, using a data set corresponding to an integrated luminosity of 3.0 fb−1 recorded with the LHCb detector. We measure Cf = 0.73 ± 0.14 ± 0.05, A
f
ΔΓ
= 0.39 ± 0.28 ± 0.15,
A
f
¯
Δ
Γ
=
0.31
±
0.28
±
0.15
$$ {A}_{\overline{f}}^{\varDelta \varGamma }=0.31\pm 0.28\pm 0.15 $$
, Sf = −0.52 ± 0.20 ± 0.07,
S
f
¯
=
−
0.49
±
0.20
±
0.07
$$ {S}_{\overline{f}}=-0.49\pm 0.20\pm 0.07 $$
, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the B
s
0
mixing phase, −2βs, to obtain a measurement of the CKM angle γ from B
s
0
→ D
s
∓
K± decays, yielding γ = (128
− 22
+ 17
)° modulo 180°, where the uncertainty contains both statistical and systematic contributions. This corresponds to 3.8 σ evidence for CP violation in the interference between decay and decay after mixing.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP03(2018)059
