Precision Measurement of the Mass and Lifetime of the Ξb- Baryon

被引：34

作者：

Aaij, R. ^{[42
]}

Adeva, B. ^{[38
]}

Adinolfi, M. ^{[47
]}

Affolder, A. ^{[53
]}

Ajaltouni, Z. ^{[5
]}

Akar, S. ^{[6
]}

Albrecht, J. ^{[9
]}

Alessio, F. ^{[39
]}

Alexander, M. ^{[52
]}

Ali, S. ^{[42
]}

Alkhazov, G. ^{[30
]}

Alvarez Cartelle, P. ^{[38
]}

Alves, A. A., Jr. ^{[25
,39
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[22
]}

Amhis, Y. ^{[7
]}

An, L. ^{[3
]}

Anderlini, L. ^{[17
]}

Anderson, J. ^{[41
]}

Andreassen, R. ^{[58
]}

Andreotti, M. ^{[16
]}

Andrews, J. E. ^{[59
]}

Appleby, R. B. ^{[55
]}

Gutierrez, O. Aquines ^{[10
]}

Archilli, F. ^{[39
]}

Artamonov, A. ^{[36
]}

Artuso, M. ^{[60
]}

Aslanides, E. ^{[6
]}

Auriemma, G. ^{[25
]}

Baalouch, M. ^{[5
]}

Bachmann, S. ^{[11
]}

Back, J. J. ^{[49
]}

Badalov, A. ^{[37
]}

Baesso, C.

Baldini, W. ^{[16
]}

Barlow, R. J. ^{[55
]}

Barschel, C. ^{[39
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[48
]}

Batozskaya, V. ^{[28
]}

Battista, V. ^{[40
]}

Bay, A. ^{[40
]}

Beaucourt, L. ^{[4
]}

Beddow, J. ^{[52
]}

Bedeschi, F. ^{[23
]}

Bediaga, I. ^{[1
]}

Belogurov, S. ^{[31
]}

Belous, K. ^{[36
]}

Belyaev, I. ^{[31
]}

Ben-Haim, E. ^{[8
]}

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 100084, Peoples R China

[4] Univ Savoie, 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 11, CNRS, IN2P3, LAL, F-91405 Orsay, France

[8] Univ Paris 06, Univ Paris Diderot, CNRS, IN2P3,LPNHE, Paris, France

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

[10] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

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

[12] Univ Coll Dublin, Sch Phys, Dublin 2, Ireland

[13] Sez INFN Bari, Bari, Italy

[14] Sez INFN Bologna, Bologna, Italy

[15] Sez INFN Cagliari, Cagliari, Italy

[16] Sez INFN Ferrara, Ferrara, Italy

[17] Sez INFN Firenze, Florence, Italy

[18] Lab Nazl INFN Frascati, Frascati, Italy

[19] Sez INFN Genova, Genoa, Italy

[20] Sez INFN Milano Bicocca, Milan, Italy

[21] Sez INFN Milano, Milan, Italy

[22] Sez INFN Padova, Padua, Italy

[23] Sez INFN Pisa, Pisa, Italy

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

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

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

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

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

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

[30] Petersburg Nucl Phys Inst, Gatchina, Russia

[31] Inst Theoret & Expt Phys, Moscow 117259, Russia

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

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

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

[35] Novosibirsk State Univ, Novosibirsk 630090, Russia

[36] Inst High Energy Phys, Protvino, Russia

[37] Univ Barcelona, Barcelona, Spain

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

[39] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

[40] Ecole Polytech Fed Lausanne, Lausanne, Switzerland

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

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

[43] Vrije Univ Amsterdam, Amsterdam, Netherlands

[44] NSC Kharkiv Inst Phys & Technol NSC KIPT, Kharkov, Ukraine

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

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

[47] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[48] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[49] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[50] STFC Rutherford Appleton Lab, Didcot, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 24期

基金：

美国国家科学基金会;

关键词：

DISCARDING 1/N(C); BEAUTY; DECAYS; CHARM; RULE;

D O I：

10.1103/PhysRevLett.113.242002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on measurements of the mass and lifetime of the Xi(-)(b) baryon using about 1800 Xi(-)(b) decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb(-1) collected by the LHCb experiment. The decays are reconstructed in the Xi(-)(b) -> Xi(0)(c)pi(-), Xi(0)(c) -> pK(-)K(-)pi(+) channel and the mass and lifetime are measured using the Lambda(0)(b) -> Lambda(+)(c)pi(-) mode as a reference. We measure M(Xi(-)(b)) - M(Lambda(0)(b)) = 178.36 +/- 0.46 +/- 0.16 MeV/c(2), (tau Xi(-)(b)/tau Lambda(0)(b)) = 1.089 +/- 0.026 +/- 0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Xi(-)(b) mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.

引用

页数：9

共 46 条

[21]

BIGI II, ARXIVHEPPH9508408

[22]

BLOK B, 1993, NUCL PHYS B, V399, P459, DOI 10.1016/0550-3213(93)90505-J

[23] THE RULE OF DISCARDING 1/N(C) IN INCLUSIVE WEAK DECAYS .1. [J].