Measurement of the lifetime of b-baryons

被引：16

作者：

Abreu, P

Adam, W

Adye, T

Adzic, P

Albrecht, Z

Alderweireld, T

Alekseev, GD

Alemany, R

Allmendinger, T

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Anassontzis, EG

Andersson, P

Andreazza, A

Andringa, S

Antilogus, P

Apel, WD

Arnoud, Y

Åsman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barbiellini, G

Barbier, R

Bardin, DY

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Beilliere, P

Belokopytov, Y

Belous, K

Benvenuti, AC

Berat, C

Berggren, M

Bertini, D

Bertrand, D

Besancon, M

Bianchi, F

Bigi, M

Bilenky, MS

Bizouard, MA

Bloch, D

Blom, HM

机构：

[1] FCUL, IST, LIP, PT-1000 Lisbon, Portugal

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Univ Instelling Antwerp, Dept Phys, B-2610 Antwerp, Belgium

[4] Free Univ Brussels, ULB, IIHE, B-1050 Brussels, Belgium

[5] Univ Mons, Fac Sci, B-7000 Mons, Belgium

[6] Univ Athens, Phys Lab, GR-10680 Athens, Greece

[7] Univ Bergen, Dept Phys, NO-5007 Bergen, Norway

[8] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[9] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[10] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[11] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil

[12] Univ Estado Rio De Janeiro, Inst Fis, Rio De Janeiro, Brazil

[13] Comenius Univ, Fac Math & Phys, SK-84215 Bratislava, Slovakia

[14] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, F-75231 Paris 05, France

[15] CERN, CH-1211 Geneva 23, Switzerland

[16] Univ Strasbourg, CNRS, IN2P3, Inst Rech Subatom, F-67037 Strasbourg, France

[17] Natl Ctr Sci Res Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[18] Acad Sci Czech Republ, Inst Phys, FZU, Div High Energy Phys, CZ-18040 Prague 8, Czech Republic

[19] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[20] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[21] Univ Grenoble 1, Inst Sci Nucl, IN2P3, CNRS, F-38026 St Martin Dheres, France

[22] Helsinki Inst Phys, FI-00014 Helsinki, Finland

[23] Joint Inst Nucl Res Dubna, RU-101000 Moscow, Russia

[24] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[25] Inst Nucl Phys, PL-30055 Krakow, Poland

[26] Stanislaw Staszic Univ Min & Met, PL-30055 Krakow, Poland

[27] Univ Paris 11, Lab Accelerateur Lineaire, IN2P3, CNRS, F-91405 Orsay, France

[28] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[30] Univ Paris 06, CNRS, IN2P3, LPNHE, F-75252 Paris 05, France

[31] Univ Paris 07, CNRS, IN2P3, LPNHE, F-75252 Paris 05, France

[32] Lund Univ, Dept Phys, SE-22363 Lund, Sweden

[33] Univ Lyon 1, IPNL, IN2P3, CNRS, F-69622 Villeurbanne, France

[34] Univ Aix Marseille 2, CPP, IN2P3, CNRS, F-13288 Marseille 09, France

[35] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[36] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[37] Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

[38] Charles Univ Prague, Nucl Ctr MFF, Areal MFF, NC, CZ-18000 Prague 8, Czech Republic

[39] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[40] Natl Tech Univ Athens, Dept Phys, GR-15773 Zografos, Greece

[41] Univ Oslo, Dept Phys, NO-1000 Oslo 3, Norway

[42] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain

[43] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[44] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[45] Ist Nazl Fis Nucl, I-35131 Padua, Italy

[46] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[47] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy

[48] Ist Nazl Fis Nucl, I-00173 Rome, Italy

[49] Univ Roma 3, Dipartimento Fis, I-00146 Rome, Italy

[50] Ist Nazl Fis Nucl, I-00146 Rome, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 1999年 / 10卷 / 02期

关键词：

D O I：

10.1007/s100520050582

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The average lifetime of weakly decaying b-baryons was studied using 3.6 million Z(0) hadronic decays collected by the DELPHI detector at LEP. The measurement of the proper decay time distribution of secondary vertices was used on three complementary samples. The first sample consisted of events with a fully reconstructed Lambda(c)(+) and an opposite charge lepton, or an oppositely charged lepton pair accompanied by a Lambda(0) The other two samples were more inclusive, where b-baryon semileptonic decays were recognized by the presence of either a proton identified by the RICH detector or a Lambda(0) and a lepton of charge opposite to that of the proton. The combined result was: tau(b-baryon) = 1.14 +/- 0.08 (stat) +/- 0.04 (syst) ps.

引用

页码：185 / 199

页数：15

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