Measurement of the Ratio of Branching Fractions ℬ(Bc+→j/ψτ+ντ)/ℬ(Bc+→j/ψμ+νμ)

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

doi:10.1103/PhysRevLett.120.121801

Measurement of the Ratio of Branching Fractions ℬ(B_c⁺→j/ψτ⁺ν_τ)/ℬ(B_c⁺→j/ψμ⁺ν_μ)

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

Physics and Astronomy

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Abstract

A measurement is reported of the ratio of branching fractions ℛ(J/ψ)=ℬ(B_c⁺→J/ψτ⁺ν_τ)/ℬ(B_c⁺→J/ψμ⁺ν_μ), where the τ⁺ lepton is identified in the decay mode τ⁺→μ⁺ν_μv̅_τ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb^-1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay B_c⁺→J/ψτ⁺ν_τ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be ℛ(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.

Original language	English
Article number	121801
Number of pages	10
Journal	Physical Review Letters
Volume	120
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.120.121801
Publication status	Published - 23 Mar 2018

ASJC Scopus subject areas

Physics and Astronomy(all)

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Aaij_et_al_Measurement_of_the_ratio_Physical_Review_Letters_2018
Published in Physical Review Letters on 23/03/2018 DOI: 10.1103/PhysRevLett.120.121801
Final published version, 271 KBLicence: Creative Commons: Attribution (CC BY)

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Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., ... Williams, T. (2018). Measurement of the Ratio of Branching Fractions ℬ(B_c⁺→j/ψτ⁺ν_τ)/ℬ(B_c⁺→j/ψμ⁺ν_μ). Physical Review Letters, 120(12), Article 121801. https://doi.org/10.1103/PhysRevLett.120.121801

@article{ac51a97da00f437e988b6c34ab68be14,

title = "Measurement of the Ratio of Branching Fractions ℬ(Bc+→j/ψτ+ντ)/ℬ(Bc+→j/ψμ+νμ)",

abstract = "A measurement is reported of the ratio of branching fractions ℛ(J/ψ)=ℬ(Bc+→J/ψτ+ντ)/ℬ(Bc+→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμv̅τ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay Bc+→J/ψτ+ντ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be ℛ(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.",

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'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 C. Lazzeroni and A. Mazurov and A. Sergi and Watson, {N. K.} and Williams, {M. P.} and Zarebski, {K. A.} and {LHCb Collaboration} and Timothy Williams",

year = "2018",

month = mar,

day = "23",

doi = "10.1103/PhysRevLett.120.121801",

language = "English",

volume = "120",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "12",

}

Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, D'Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Atzeni, M, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baker, S, Balagura, V, Baldini, W, Bifani, S, Calladine, R, Chatzikonstantinidis, G, Farley, N, Lazzeroni, C, Mazurov, A, Sergi, A, Watson, NK, Williams, MP, Zarebski, KA, LHCb Collaboration & Williams, T 2018, 'Measurement of the Ratio of Branching Fractions ℬ(B_c⁺→j/ψτ⁺ν_τ)/ℬ(B_c⁺→j/ψμ⁺ν_μ)', Physical Review Letters, vol. 120, no. 12, 121801. https://doi.org/10.1103/PhysRevLett.120.121801

TY - JOUR

T1 - Measurement of the Ratio of Branching Fractions ℬ(Bc+→j/ψτ+ντ)/ℬ(Bc+→j/ψμ+νμ)

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 - Lazzeroni, C.

AU - Mazurov, A.

AU - Sergi, A.

AU - Watson, N. K.

AU - Williams, M. P.

AU - Zarebski, K. A.

AU - LHCb Collaboration

AU - Williams, Timothy

PY - 2018/3/23

Y1 - 2018/3/23

N2 - A measurement is reported of the ratio of branching fractions ℛ(J/ψ)=ℬ(Bc+→J/ψτ+ντ)/ℬ(Bc+→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμv̅τ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay Bc+→J/ψτ+ντ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be ℛ(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.

AB - A measurement is reported of the ratio of branching fractions ℛ(J/ψ)=ℬ(Bc+→J/ψτ+ντ)/ℬ(Bc+→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμv̅τ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay Bc+→J/ψτ+ντ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be ℛ(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.

UR - http://www.scopus.com/inward/record.url?scp=85044424874&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.120.121801

DO - 10.1103/PhysRevLett.120.121801

M3 - Article

AN - SCOPUS:85044424874

SN - 0031-9007

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 121801

ER -

Measurement of the Ratio of Branching Fractions ℬ(Bc+→j/ψτ+ντ)/ℬ(Bc+→j/ψμ+νμ)

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Measurement of the Ratio of Branching Fractions ℬ(B_c⁺→j/ψτ⁺ν_τ)/ℬ(B_c⁺→j/ψμ⁺ν_μ)