Measurement of CP asymmetry in Bs0 → Ds∓ K± decays

LHCb Collaboration

doi:10.1007/JHEP03(2018)059

Measurement of CP asymmetry in B_s⁰ → D_s^∓ K^± decays

LHCb Collaboration

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

156 Downloads (Pure)

Abstract

We report the measurements of the CP -violating parameters in B_s⁰ → 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 C_f = 0.73 ± 0.14 ± 0.05, A_f ^ΔΓ = 0.39 ± 0.28 ± 0.15, A_f̅^ΔΓ=0.31±0.28±0.15, S_f = −0.52 ± 0.20 ± 0.07, S_f̅= − 0.49 ± 0.20 ± 0.07, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the B_s⁰ mixing phase, −2β_s, to obtain a measurement of the CKM angle γ from B_s⁰ → 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.

Original language	English
Article number	59
Number of pages	28
Journal	Journal of High Energy Physics
Volume	2018
Issue number	3
DOIs	https://doi.org/10.1007/JHEP03(2018)059
Publication status	Published - 12 Mar 2018

Keywords

B physics
CKM angle gamma
CP violation
Flavor physics
Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1007/JHEP03(2018)059Licence: Creative Commons: Attribution (CC BY)

Aaij_et_al_Measurement_of_CP_assymmetry_Journal_of_High_Energy_Physics_2018
Published in Journal of High Energy Physics on 12/03/2018 DOI: 10.1007/JHEP03(2018)059
Final published version, 0.99 MBLicence: Creative Commons: Attribution (CC BY)

https://link.springer.com/article/10.1007/JHEP03(2018)059Licence: Creative Commons: Attribution (CC BY)

Cite this

@article{40e0a86a1b3e412bb19130a376f72de2,

title = "Measurement of CP asymmetry in Bs0 → Ds∓ K± decays",

abstract = "We report the measurements of the CP -violating parameters in Bs0 → Ds∓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, Af ΔΓ = 0.39 ± 0.28 ± 0.15, Af̅ΔΓ=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf̅= − 0.49 ± 0.20 ± 0.07, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the Bs0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs0 → Ds ∓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.",

keywords = "B physics, CKM angle gamma, CP violation, Flavor physics, Hadron-Hadron scattering (experiments)",

author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d{\textquoteright}Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and M. Atzeni and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and S. Baker and V. Balagura and W. Baldini and S. Bifani and R. Calladine and G. Chatzikonstantinidis and N. Farley and P. Ilten and C. Lazzeroni and A. Mazurov and A. Sergi and Watson, {N. K.} and Zarebski, {K. A.} and Timothy Williams",

year = "2018",

month = mar,

day = "12",

doi = "10.1007/JHEP03(2018)059",

language = "English",

volume = "2018",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "3",

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TY - JOUR

T1 - Measurement of CP asymmetry in Bs0 → Ds∓ K± decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d’Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Bifani, S.

AU - Calladine, R.

AU - Chatzikonstantinidis, G.

AU - Farley, N.

AU - Ilten, P.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - Sergi, A.

AU - Watson, N. K.

AU - Zarebski, K. A.

AU - Williams, Timothy

PY - 2018/3/12

Y1 - 2018/3/12

N2 - We report the measurements of the CP -violating parameters in Bs0 → Ds∓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, Af ΔΓ = 0.39 ± 0.28 ± 0.15, Af̅ΔΓ=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf̅= − 0.49 ± 0.20 ± 0.07, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the Bs0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs0 → Ds ∓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.

AB - We report the measurements of the CP -violating parameters in Bs0 → Ds∓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, Af ΔΓ = 0.39 ± 0.28 ± 0.15, Af̅ΔΓ=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf̅= − 0.49 ± 0.20 ± 0.07, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the Bs0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs0 → Ds ∓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.

KW - B physics

KW - CKM angle gamma

KW - CP violation

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

UR - http://www.scopus.com/inward/record.url?scp=85044395494&partnerID=8YFLogxK

U2 - 10.1007/JHEP03(2018)059

DO - 10.1007/JHEP03(2018)059

M3 - Article

AN - SCOPUS:85044395494

SN - 1126-6708

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 3

M1 - 59

ER -