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

被引：209

作者：

Aaij, R. ^{[42
]}

Adeva, B. ^{[41
]}

Adinolfi, M. ^{[50
]}

Ajaltouni, Z. ^{[5
]}

Akar, S. ^{[61
]}

Albrecht, J. ^{[10
]}

Alessio, F. ^{[42
]}

Alexander, M. ^{[55
]}

Alfonso Albero, A. ^{[40
,49
]}

Ali, S. ^{[45
]}

Alkhazov, G. ^{[33
]}

Cartelle, P. Alvarez ^{[57
]}

Alves, A. A., Jr. ^{[61
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[25
]}

Amhis, Y. ^{[7
]}

An, L. ^{[3
]}

Anderlini, L. ^{[19
]}

Andreassi, G. ^{[43
]}

Andreotti, M. ^{[17
,18
]}

Andrews, J. E. ^{[62
]}

Appleby, R. B. ^{[58
]}

Archilli, F. ^{[45
]}

d'Argent, P. ^{[12
]}

Romeu, J. Arnau ^{[6
]}

Artamonov, A. ^{[39
]}

Artuso, M. ^{[63
]}

Aslanides, E. ^{[6
]}

Atzeni, M. ^{[44
]}

Auriemma, G. ^{[28
]}

Baalouch, M. ^{[5
]}

Babuschkin, I. ^{[58
]}

Bachmann, S. ^{[12
]}

Back, J. J. ^{[52
]}

Badalov, A. ^{[40
,74
]}

Baesso, C. ^{[3
,64
]}

Baker, S. ^{[57
]}

Balagura, V. ^{[7
,75
]}

Baldini, W. ^{[17
,18
]}

Baranov, A. ^{[37
]}

Barlow, R. J. ^{[58
]}

Barschel, C. ^{[42
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[58
]}

Baryshnikov, F. ^{[34
]}

Batozskaya, V. ^{[31
]}

Battista, V. ^{[43
]}

Bay, A. ^{[43
]}

Beaucourt, L. ^{[4
]}

Beddow, J. ^{[55
]}

机构：

[1] CBPF, Rio De Janeiro, Brazil

[2] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil

[3] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China

[4] Univ Savoie Mont Blanc, CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[5] Clermont Univ, Univ Blaise Pascal, CNRS, IN2P3, Clermont Ferrand, France

[6] Aix Marseille Univ, CNRS, IN2P3, CPPM, Marseille, France

[7] Univ Paris Saclay, CNRS, IN2P3, Univ Paris Sud,LAL, Orsay, France

[8] Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS IN2P3, LPNHE, Paris, France

[9] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

[10] Tech Univ Dortmund, Fak Phys, Dortmund, Germany

[11] Max Planck Inst Kernphys MPIK, Heidelberg, Germany

[12] Heidelberg Univ, Phys Inst, Heidelberg, Germany

[13] Univ Coll Dublin, Sch Phys, Dublin, Ireland

[14] Sez INFN Bari, Bari, Italy

[15] Sez INFN Bologna, Bologna, Italy

[16] Sez INFN Cagliari, Cagliari, Italy

[17] Univ Ferrara, Ferrara, Italy

[18] INFN, Ferrara, Italy

[19] Sez INFN Firenze, Florence, Italy

[20] INFN Frascati, Lab Nazl, Frascati, Italy

[21] Sez INFN Genova, Genoa, Italy

[22] Univ Milan, Milan, Italy

[23] INFN, Milan, Italy

[24] Sez Milano, Milan, Italy

[25] Sez INFN Padova, Padua, Italy

[26] Sez INFN Pisa, Pisa, Italy

[27] Sez INFN Roma Tor Vergata, Rome, Italy

[28] Sez INFN Roma Sapienza, Rome, Italy

[29] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland

[30] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland

[31] Natl Ctr Nucl Res NCBJ, Warsaw, Poland

[32] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[33] PNPI, Gatchina, Russia

[34] ITEP, Moscow, Russia

[35] Moscow State Univ SINP MSU, Inst Nucl Phys, Moscow, Russia

[36] INR RAN, Moscow, Russia

[37] Yandex Sch Data Anal, Moscow, Russia

[38] SB RAS, Budker Inst Nucl Phys, Novosibirsk, Russia

[39] IHEP, Protvino, Russia

[40] Univ Barcelona, ICCUB, Barcelona, Spain

[41] Univ Santiago de Compostela, Santiago De Compostela, Spain

[42] CERN, European Org Nucl Res, Geneva, Switzerland

[43] Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland

[44] Univ Zurich, Phys Inst, Zurich, Switzerland

[45] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands

[46] Vrije Univ Amsterdam, Amsterdam, Netherlands

[47] NSC KIPT, Kharkov, Ukraine

[48] Natl Acad Sci KINR, Inst Nucl Res, Kiev, Ukraine

[49] Univ Birmingham, Birmingham, W Midlands, England

[50] Univ Bristol, HH Wills Phys Lab, Bristol, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.120.121801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A measurement is reported of the ratio of branching fractions R(J/psi) = B(B-c(+) -> J/psi tau(+)nu(tau))/B(B-c(+) -> J/psi mu(+)nu(mu)), where the tau(+) lepton is identified in the decay mode tthorn tau(+) -> mu(+)nu(mu)(nu) over bar (tau). 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/psi tau(+)nu(tau) at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R(J/psi) = 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.

引用

页数：10

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