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

The LHCb Collaboration

Research School of High-Energy Physics

Research output: Contribution to journal › Article

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, Af=0.31±0.28±0.15, S_f = −0.52 ± 0.20 ± 0.07, S_f¯= − 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
Journal	Journal of High Energy Physics
Volume	2018
Issue number	3
DOIs	https://doi.org/10.1007/JHEP03(2018)059
Publication status	Published - 1 Mar 2018

Fingerprint

asymmetry

decay

CP violation

luminosity

interference

collisions

detectors

Keywords

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

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

The LHCb Collaboration (2018). Measurement of CP asymmetry in B_s⁰ → D_s^∓ K ^± decays. Journal of High Energy Physics, 2018(3), [59]. https://doi.org/10.1007/JHEP03(2018)059

Measurement of CP asymmetry in B_s⁰ → D_s^∓ K ^± decays. / The LHCb Collaboration.

In: Journal of High Energy Physics, Vol. 2018, No. 3, 59, 01.03.2018.

Research output: Contribution to journal › Article

The LHCb Collaboration 2018, 'Measurement of CP asymmetry in B_s⁰ → D_s^∓ K ^± decays', Journal of High Energy Physics, vol. 2018, no. 3, 59. https://doi.org/10.1007/JHEP03(2018)059

The LHCb Collaboration. Measurement of CP asymmetry in B_s⁰ → D_s^∓ K ^± decays. Journal of High Energy Physics. 2018 Mar 1;2018(3). 59. https://doi.org/10.1007/JHEP03(2018)059

The LHCb Collaboration. / Measurement of CP asymmetry in B_s⁰ → D_s^∓ K ^± decays. In: Journal of High Energy Physics. 2018 ; Vol. 2018, No. 3.

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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, AfΔΓ = 0.39 ± 0.28 ± 0.15, Af=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf¯= − 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 = "{The 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’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 A. Baranov and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and F. Baryshnikov and V. Batozskaya and V. Battista and A. Mazurov and A. Petrov and A. Vagner",

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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.

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AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

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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 - Baranov, A.

AU - Barlow, R. J.

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AU - Barsuk, S.

AU - Barter, W.

AU - Baryshnikov, F.

AU - Batozskaya, V.

AU - Battista, V.

AU - Mazurov, A.

AU - Petrov, A.

AU - Vagner, A.

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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, AfΔΓ = 0.39 ± 0.28 ± 0.15, Af=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf¯= − 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, AfΔΓ = 0.39 ± 0.28 ± 0.15, Af=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf¯= − 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)

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DO - 10.1007/JHEP03(2018)059

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Access to Document

10.1007/JHEP03(2018)059