Measurement of the B0s→ μ+ μ- Branching Fraction and Effective Lifetime and Search for B0→μ+ μ- Decays

被引：155

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
]}

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. ^{[18
]}

Andreassi, G. ^{[41
]}

Andreotti, M. ^{[17
,77
]}

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
]}

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

Baker, S. ^{[55
]}

Balagura, V. ^{[7
,78
]}

Baldini, W. ^{[17
]}

Baranov, A. ^{[35
]}

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

Barschel, C. ^{[40
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[56
]}

Baryshnikov, F. ^{[32
]}

Baszczyk, M. ^{[27
,79
]}

Batozskaya, V. ^{[29
]}

Batsukh, B. ^{[61
]}

Battista, V. ^{[41
]}

Bay, A. ^{[41
]}

Beaucourt, L. ^{[4
]}

Beddow, J. ^{[53
]}

机构：

[1] CBPF, 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 IN2P3, LAPP, Annecy Le Vieux, France

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

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

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

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

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

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

[11] 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] Sez INFN Ferrara, Ferrara, Italy

[18] Sez INFN Firenze, Florence, Italy

[19] Lab Nazl INFN Frascati, Frascati, Italy

[20] Sez INFN Genova, Genoa, Italy

[21] Sez INFN Milano Bicocca, Milan, Italy

[22] Sez INFN 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] NCBJ, Warsaw, Poland

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

[31] PNPI, Gatchina, Russia

[32] ITEP, Moscow, Russia

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

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

[35] Yandex Sch Data Anal, Moscow, Russia

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

[37] IHEP, Protvino, Russia

[38] Univ Barcelona, ICCUB, Barcelona, Spain

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

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

[41] Ecole Polytech Fed 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 KIPT, Kharkov, Ukraine

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

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

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

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

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

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 19期

关键词：

TOOL; B-0;

D O I：

10.1103/PhysRevLett.118.191801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A search for the rare decays B-s(0)->mu(+)mu(-) and B-0 -> mu(+)mu(-) is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb(-1). An excess of B-s(0) -> mu(+)mu- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(B-s(0) -> mu(+)mu(-)) = (3.0 +/- 0.6(-0.2)(+)(0.3)) x 10(-9), where the first uncertainty is statistical and the second systematic. The first measurement of the B-s(0) -> mu(+)mu(-) effective lifetime, tau(B-s(0)-> mu(+) mu(-)) = 2.04 +/- 0.44 +/- 0.05 ps, is reported. No significant excess of B-0 -> mu(+)mu(-) decays is found, and a 95% confidence level upper limit, B(B-0 -> mu(+)mu(-) ) < 3.4 x 10(-10), is determined. All results are in agreement with the standard model expectations.

引用

页数：11

共 49 条

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