Measurement of Bs0 and Ds- Meson Lifetimes

LHCb Collaboration

doi:10.1103/PhysRevLett.119.101801

Measurement of Bs0 and Ds- Meson Lifetimes

LHCb Collaboration

Physics and Astronomy

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Abstract

We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds- lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0→Ds(∗)-μ+νμ decays are partially reconstructed in the K+K-π-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0→D(∗)-μ+νμ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds- and D- mesons are ΔΓ(B)=-0.0115±0.0053(stat)±0.0041(syst) ps-1 and ΔΓ(D)=1.0131±0.0117(stat)±0.0065(syst) ps-1, respectively. Combined with the known B0 and D- lifetimes, these yield the flavor-specific Bs0 lifetime, τBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(τB) ps and the Ds- lifetime, τDs-=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τD) ps. The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations.

Original language	English
Article number	101801
Journal	Physical Review Letters
Volume	119
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.119.101801
Publication status	Published - 8 Sept 2017

ASJC Scopus subject areas

General Physics and Astronomy

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@article{44c60d8cb1d247dcb4e9a6c05511139b,

title = "Measurement of Bs0 and Ds- Meson Lifetimes",

abstract = "We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds- lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0→Ds(∗)-μ+νμ decays are partially reconstructed in the K+K-π-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0→D(∗)-μ+νμ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds- and D- mesons are ΔΓ(B)=-0.0115±0.0053(stat)±0.0041(syst) ps-1 and ΔΓ(D)=1.0131±0.0117(stat)±0.0065(syst) ps-1, respectively. Combined with the known B0 and D- lifetimes, these yield the flavor-specific Bs0 lifetime, τBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(τB) ps and the Ds- lifetime, τDs-=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τD) ps. The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations.",

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 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 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 S. Bifani and G. Chatzikonstantinidis and N. Farley and C. Lazzeroni and A. Mazurov and A. Sergi and Watson, {N. K.} and T. Williams and Zarebski, {K. A.}",

year = "2017",

month = sep,

day = "8",

doi = "10.1103/PhysRevLett.119.101801",

language = "English",

volume = "119",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "10",

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TY - JOUR

T1 - Measurement of Bs0 and Ds- Meson Lifetimes

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 - 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 - 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.

AU - Barschel, C.

AU - Barsuk, S.

AU - Bifani, S.

AU - Chatzikonstantinidis, G.

AU - Farley, N.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - Sergi, A.

AU - Watson, N. K.

AU - Williams, T.

AU - Zarebski, K. A.

PY - 2017/9/8

Y1 - 2017/9/8

N2 - We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds- lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0→Ds(∗)-μ+νμ decays are partially reconstructed in the K+K-π-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0→D(∗)-μ+νμ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds- and D- mesons are ΔΓ(B)=-0.0115±0.0053(stat)±0.0041(syst) ps-1 and ΔΓ(D)=1.0131±0.0117(stat)±0.0065(syst) ps-1, respectively. Combined with the known B0 and D- lifetimes, these yield the flavor-specific Bs0 lifetime, τBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(τB) ps and the Ds- lifetime, τDs-=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τD) ps. The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations.

AB - We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds- lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0→Ds(∗)-μ+νμ decays are partially reconstructed in the K+K-π-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0→D(∗)-μ+νμ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds- and D- mesons are ΔΓ(B)=-0.0115±0.0053(stat)±0.0041(syst) ps-1 and ΔΓ(D)=1.0131±0.0117(stat)±0.0065(syst) ps-1, respectively. Combined with the known B0 and D- lifetimes, these yield the flavor-specific Bs0 lifetime, τBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(τB) ps and the Ds- lifetime, τDs-=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τD) ps. The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations.

UR - http://www.scopus.com/inward/record.url?scp=85029716388&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.119.101801

DO - 10.1103/PhysRevLett.119.101801

M3 - Article

AN - SCOPUS:85029716388

SN - 0031-9007

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

IS - 10

M1 - 101801

ER -

Measurement of Bs0 and Ds- Meson Lifetimes

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