Observation of CP violation in two-body B(s)0 -meson decays to charged pions and kaons

LHCb Collaboration

doi:10.1007/JHEP03(2021)075

Observation of CP violation in two-body B_(s)⁰ -meson decays to charged pions and kaons

LHCb Collaboration

Physics and Astronomy

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Abstract

The time-dependent CP asymmetries of B⁰→ π⁺π⁻ and B_s⁰→ K⁺K⁻ decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb⁻¹, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are

C_ππ=−0.311±0.045±0.015,
S_ππ=−0.706±0.042±0.013,
C_KK=0.123±0.034±0.015,
S_KK=0.164±0.034±0.014,
A_KK^ΔΓ=−0.83±0.05±0.09,

where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B⁰→ K + π⁻ and B_s⁰_→K⁻π⁺ decays and the results are

A_CP^B0=−0.0824±0.0033±0.0033,
A_CP^Bs0=0.236±0.013±0.011.

All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in B_s⁰ decays.

Original language	English
Article number	75
Number of pages	43
Journal	Journal of High Energy Physics
Volume	2021
Issue number	3
DOIs	https://doi.org/10.1007/JHEP03(2021)075
Publication status	Published - 8 Mar 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).

Keywords

B physics
CP violation
Flavor physics
Hadron-Hadron scattering (experiments)
Oscillation

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1007/JHEP03(2021)075Licence: Creative Commons: Attribution (CC BY)

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Cite this

@article{014bfaf538cd42c6b2a82d232ba0582e,

title = "Observation of CP violation in two-body B(s)0 -meson decays to charged pions and kaons",

abstract = "The time-dependent CP asymmetries of B0→ π+π− and Bs0→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are Cππ=−0.311±0.045±0.015,Sππ=−0.706±0.042±0.013,CKK=0.123±0.034±0.015,SKK=0.164±0.034±0.014,AKKΔΓ=−0.83±0.05±0.09, where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0→ K + π− and Bs0→K−π+ decays and the results areACPB0=−0.0824±0.0033±0.0033,ACPBs0=0.236±0.013±0.011.All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in Bs0 decays. ",

keywords = "B physics, CP violation, Flavor physics, Hadron-Hadron scattering (experiments), Oscillation",

author = "{LHCb Collaboration} and R. Aaij and {Abell{\'a}n Beteta}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and Z. Aliouche and G. Alkhazov and {Alvarez Cartelle}, P. and S. Amato and Y. Amhis and L. An and L. Anderlini and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and Back, {J. J.} and S. Baker and S. Bifani and R. Calladine and G. Chatzikonstantinidis and N. Cooke and V. Duk and N. Farley and P. Griffith and P. Ilten and Parkinson, {C. J.} and J. Plews and D. Popov and A. Sergi and Slater, {M. W.} and Swallow, {P. N.} and Watson, {N. K.} and Zarebski, {K. A.}",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s). ",

year = "2021",

month = mar,

day = "8",

doi = "10.1007/JHEP03(2021)075",

language = "English",

volume = "2021",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "3",

}

TY - JOUR

T1 - Observation of CP violation in two-body B(s)0 -meson decays to charged pions and kaons

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baker, S.

AU - Bifani, S.

AU - Calladine, R.

AU - Chatzikonstantinidis, G.

AU - Cooke, N.

AU - Duk, V.

AU - Farley, N.

AU - Griffith, P.

AU - Ilten, P.

AU - Parkinson, C. J.

AU - Plews, J.

AU - Popov, D.

AU - Sergi, A.

AU - Slater, M. W.

AU - Swallow, P. N.

AU - Watson, N. K.

AU - Zarebski, K. A.

PY - 2021/3/8

Y1 - 2021/3/8

N2 - The time-dependent CP asymmetries of B0→ π+π− and Bs0→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are Cππ=−0.311±0.045±0.015,Sππ=−0.706±0.042±0.013,CKK=0.123±0.034±0.015,SKK=0.164±0.034±0.014,AKKΔΓ=−0.83±0.05±0.09, where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0→ K + π− and Bs0→K−π+ decays and the results areACPB0=−0.0824±0.0033±0.0033,ACPBs0=0.236±0.013±0.011.All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in Bs0 decays.

AB - The time-dependent CP asymmetries of B0→ π+π− and Bs0→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are Cππ=−0.311±0.045±0.015,Sππ=−0.706±0.042±0.013,CKK=0.123±0.034±0.015,SKK=0.164±0.034±0.014,AKKΔΓ=−0.83±0.05±0.09, where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0→ K + π− and Bs0→K−π+ decays and the results areACPB0=−0.0824±0.0033±0.0033,ACPBs0=0.236±0.013±0.011.All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in Bs0 decays.

KW - B physics

KW - CP violation

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

KW - Oscillation

UR - http://www.scopus.com/inward/record.url?scp=85102465875&partnerID=8YFLogxK

U2 - 10.1007/JHEP03(2021)075

DO - 10.1007/JHEP03(2021)075

M3 - Article

AN - SCOPUS:85102465875

SN - 1126-6708

VL - 2021

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 3

M1 - 75

ER -

Observation of CP violation in two-body B(s)0 -meson decays to charged pions and kaons