Measurement of CP asymmetry in Bs 0 → Ds ∓ K ± decays

The Lhcb Collaboration

doi:10.1007/JHEP03(2018)059

Measurement of CP asymmetry in B_s ⁰ → D_s ^∓ K ^± decays

The Lhcb Collaboration

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

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 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_s ⁰ mixing phase, −2β_s, 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.

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

Funding

Open Access, Copyright CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3.

Funders	Funder number
???publication-publication-funding-organisation-not-added???	ST/N000250/1, 1681016, ST/K003410/1, 1796908, ST/H006737/1, ST/N000463/1, ST/N000455/1, ST/L003163/1, ST/N000242/1
AvH Foundation
CNRS/IN2P3
EPLANET
FASO
Herchel Smith Fund
MinES
OCEVU
Yandex LLC
National Science Foundation
School of Energy Resources, University of Wyoming
H2020 Marie Skłodowska-Curie Actions
CERN
Science and Technology Facilities Council	ST/J004332/1, LHCb, LHCb Upgrades
Leverhulme Trust
Royal Society
English-Speaking Union
European Commission
European Research Council
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	166208
National Natural Science Foundation of China
Russian Foundation for Basic Research
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Generalitat Valenciana
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Ministry of Science and Technology
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Nauki i Szkolnictwa Wyższego
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
National Academy of Sciences of Ukraine
Financiadora de Estudos e Projetos
Russian Science Foundation
Région Auvergne-Rhône-Alpes

Keywords

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

Access to Document

10.1007/JHEP03(2018)059

Persistent URL (handle)

Persistent link

Cite this

@article{6d8d4b81dd6048478020676f04cb777a,

title = "Measurement of CP asymmetry in Bs 0 → Ds ∓ K ± decays",

abstract = "We report the measurements of the CP -violating parameters in Bs 0 → 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, 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 Bs 0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs 0 → 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 = "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 \{Carvalho Akiba\}, K. and V. Coco and \{De Bruyn\}, K. and M. Ferro-Luzzi and T. Ketel and T. Li and M. Merk and Onderwater, \{C. J.G.\} and G. Raven and M. Schiller and N. Serra and B. Storaci and V. Syropoulos and \{van Tilburg\}, J. and S. Tolk and P. Tsopelas and N. Tuning and \{The Lhcb Collaboration\}",

year = "2018",

month = mar,

day = "1",

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

language = "English",

volume = "2018",

journal = "Journal of High Energy Physics",

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publisher = "Springer Verlag",

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TY - JOUR

T1 - Measurement of CP asymmetry in Bs 0 → Ds ∓ K ± decays

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 - Carvalho Akiba, K.

AU - Coco, V.

AU - De Bruyn, K.

AU - Ferro-Luzzi, M.

AU - Ketel, T.

AU - Li, T.

AU - Merk, M.

AU - Onderwater, C. J.G.

AU - Raven, G.

AU - Schiller, M.

AU - Serra, N.

AU - Storaci, B.

AU - Syropoulos, V.

AU - van Tilburg, J.

AU - Tolk, S.

AU - Tsopelas, P.

AU - Tuning, N.

AU - The Lhcb Collaboration

PY - 2018/3/1

Y1 - 2018/3/1

N2 - We report the measurements of the CP -violating parameters in Bs 0 → 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, 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 Bs 0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs 0 → 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 Bs 0 → 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, 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 Bs 0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs 0 → 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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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 -