Test of lepton flavor universality by the measurement of the B0 → D*- τ+ ντ branching fraction using three-prong τ decays

被引：187

作者：

Aaij, R. ^{[40
]}

Adeva, B. ^{[39
]}

Adinolfi, M. ^{[48
]}

Ajaltouni, Z. ^{[5
]}

Akar, S. ^{[59
]}

Albrecht, J. ^{[10
]}

Alessio, F. ^{[40
]}

Alexander, M. ^{[53
]}

Alfonso Albero, A. ^{[38
,57
,92
]}

Ali, S. ^{[43
]}

Alkhazov, G. ^{[31
]}

Cartelle, P. Alvarez ^{[55
]}

Alves, A. A., Jr. ^{[59
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[23
]}

Amhis, Y. ^{[7
]}

An, L. ^{[3
]}

Anderlini, L. ^{[15
]}

Andreassi, G. ^{[41
]}

Andreotti, M. ^{[17
,82
]}

Andrews, J. E. ^{[60
]}

Appleby, R. B. ^{[56
]}

Archilli, F. ^{[43
]}

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

Romeu, J. Arnau ^{[6
]}

Artamonov, A. ^{[37
]}

Artuso, M. ^{[61
]}

Aslanides, E. ^{[6
]}

Auriemma, G. ^{[26
]}

Baalouch, M. ^{[5
]}

Babuschkin, I. ^{[56
]}

Bachmann, S. ^{[12
]}

Back, J. J. ^{[50
]}

Badalov, A. ^{[38
,88
]}

Baesso, C. ^{[62
,63
]}

Baker, S. ^{[55
]}

Balagura, V. ^{[7
,77
]}

Baldini, W. ^{[17
]}

Baranov, A. ^{[35
]}

Barlow, R. J. ^{[56
]}

Barschel, C. ^{[40
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[56
]}

Baryshnikov, F. ^{[32
]}

Batozskaya, V. ^{[29
]}

Battista, V. ^{[41
]}

Bay, A. ^{[41
]}

Beaucourt, L. ^{[4
]}

Beddow, J. ^{[53
]}

Bedeschi, F. ^{[24
]}

机构：

[1] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

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

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

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

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

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

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

[8] Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, LPNHE,IN2P3, 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, 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 & INFN, Ferrara, Italy

[18] Sez INFN Firenze, Florence, Italy

[19] Lab Nazl INFN Frascati, Frascati, Italy

[20] Sez INFN Genova, Genoa, Italy

[21] Univ & INFN, Milano Bicocca, Milan, Italy

[22] Sez Milano, Milan, Italy

[23] Sez INFN Padova, Padua, Italy

[24] Sez INFN Pisa, Pisa, Italy

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

[26] Sez INFN Roma La Sapienza, Rome, Italy

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

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

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

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

[31] Petersburg Nucl Phys Inst, Gatchina, Russia

[32] Inst Theoret & Expt Phys, Moscow, Russia

[33] Moscow MV Lomonosov State Univ, Inst Nucl Phys, SINP, Moscow, Russia

[34] Russian Acad Sci RAN, Inst Nucl Res, Moscow, Russia

[35] Yandex Sch Data Anal, Moscow, Russia

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

[37] Inst High Energy Phys, Protvino, Russia

[38] Univ Barcelona, ICCUB, Barcelona, Spain

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

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

[41] Ecole Polytech Federale Lausanne, Inst Phys, Lausanne, Switzerland

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

[43] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands

[44] Vrije Univ Amsterdam, Amsterdam, Netherlands

[45] NSC Kharkiv Inst Phys & Technol, Kharkov, Ukraine

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

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

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

[49] Univ Cambridge, Cavendish Lab, Cambridge, England

[50] Univ Warwick, Dept Phys, Coventry, W Midlands, England

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 07期

关键词：

SIMULATION; LEPTOQUARKS; ENERGY;

D O I：

10.1103/PhysRevD.97.072013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ratio of branching fractions R(D*(-)) = B(B-0 -> D*(-) tau(+)nu(tau))/(B-0 -> D*(-) mu(+)nu(mu)) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb(-1). The tau lepton is reconstructed with three charged pions in the final state. A novel method is used that exploits the different vertex topologies of signal and backgrounds to isolate samples of semitauonic decays of b hadrons with high purity. Using the B-0 -> D*(-) pi(+)pi(-)pi(+) decay as the normalization channel, the ratio B(B-0 -> D*(-) tau(+)nu(tau))/B(B-0 -> D* pi(+)pi(-)pi(+)) is measured to be 1.97 +/- 0.13 +/- 0.18, where the first uncertainty is statistical and the second systematic. An average of branching fraction measurements for the normalization channel is used to derive B(B-0 -> D*(-) tau(+)nu(tau))(_)= (1.42 +/- 0.094 +/- 0.129 +/- 0.054)%, where the third uncertainty is due to the limited knowledge of B(B-0 -> D*(-) pi(+)pi(-)pi(+)). A test of lepton flavor universality is performed using the well- measured branching fraction B(B-0 -> D*(-) mu(+)nu(mu)) to compute R(D*(-))0 = 0.291 +/- 0.019 +/- 0.026 +/- 0.013, where the third uncertainty originates from the uncertainties on B(B-0 -> D*(-) pi(+)pi(-)pi(+)) and B(B-0 -> D*(-) mu(+)nu(mu)) This measurement is in agreement with the Standard Model prediction and with previous measurements.

引用

页数：26