Measurement of the average lifetime of b-hadrons in Z decays

被引：11

作者：

Acciarri, M ^{[1
]}

Adriani, O

Aguilar-Benitez, M

Ahlen, S

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alverson, G

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Anselmo, F

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Baksay, L

Ball, RC

Banerjee, S

Banicz, K

Barczyk, A

Barillere, R

Becattini, F

Becker, U

Behner, F

Berdugo, J

Berges, P

Bertucci, B

Betev, BL

Bhattacharya, S

Biasini, M

Biland, A

Bilei, GM

Blaising, JJ

Blyth, SC

Bobbink, GJ

Bock, R

Bohm, A

Boldizsar, L

Borgia, B

Bourilkov, D

Bourquin, M

Boutigny, D

Braccini, S

Branson, JG

Brigljevic, V

机构：

[1] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany

[2] Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands

[3] NIKHEF H, Natl Inst High Energy Phys, NL-1009 DB Amsterdam, Netherlands

[4] Univ Michigan, Ann Arbor, MI 48109 USA

[5] Lab Annecy Le Vieux Phys Particules, LAPP, IN2P3, CNRS, F-74941 Annecy Le Vieux, France

[6] Johns Hopkins Univ, Baltimore, MD 21218 USA

[7] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[8] Inst High Energy Phys, Beijing 100039, Peoples R China

[9] Humboldt Univ, D-10099 Berlin, Germany

[10] Univ Bologna, I-40126 Bologna, Italy

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

[12] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[13] Boston Univ, Boston, MA 02215 USA

[14] Northeastern Univ, Boston, MA 02115 USA

[15] Inst Atom Phys, R-76900 Bucharest, Romania

[16] Univ Bucharest, R-76900 Bucharest, Romania

[17] Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest 114, Hungary

[18] Harvard Univ, Cambridge, MA 02139 USA

[19] MIT, Cambridge, MA 02139 USA

[20] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[21] Univ Florence, I-50125 Florence, Italy

[22] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland

[23] World Lab, FBLJA Project, CH-1211 Geneva 23, Switzerland

[24] Univ Geneva, CH-1211 Geneva 23, Switzerland

[25] Univ Sci & Technol China, Hefei 230029, Peoples R China

[26] SEFT, Res Inst High Energy Phys, SF-00014 Helsinki, Finland

[27] Univ Lausanne, CH-1015 Lausanne, Switzerland

[28] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[29] Univ Lecce, I-73100 Lecce, Italy

[30] Los Alamos Natl Lab, Los Alamos, NM 87544 USA

[31] Univ Lyon 1, Inst Phys Nucl Lyon, IN2P3, CNRS, F-69622 Villeurbanne, France

[32] CIEMAT, E-28040 Madrid, Spain

[33] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

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

[35] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[36] Univ Naples Federico II, I-80125 Naples, Italy

[37] Univ Cyprus, Dept Nat Sci, Nicosia, Cyprus

[38] Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

[39] Natl Inst Nucl Phys & High Energy Phys, NL-6525 ED Nijmegen, Netherlands

[40] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[41] CALTECH, Pasadena, CA 91125 USA

[42] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[43] Ist Nazl Fis Nucl, Univ Perugia, I-06100 Perugia, Italy

[44] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[45] Princeton Univ, Princeton, NJ 08544 USA

[46] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[47] Univ Roma La Sapienza, I-00185 Rome, Italy

[48] Inst Nucl Phys, St Petersburg, Russia

[49] Univ Salerno, I-84100 Salerno, Italy

[50] Ist Nazl Fis Nucl, I-84100 Salerno, Italy

来源：

PHYSICS LETTERS B | 1998年 / 416卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(97)01379-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the average b-hadron lifetime tau(b) at the e(+)e(-) collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of tau(b) using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is tau(b) = [1549 +/- 9 (stat) +/- 15 (syst)] fs. In addition, we measure the average charged b-decay multiplicity [n(b)] and the normalized average b-energy [x(E)](b) at LEP to be [n(b)] = 4.90 +/- 0.04 (stat) +/- 0.11 (syst), [x(E)](b) = 0.709 +/- 0.004 (stat + syst). (C) 1998 Published by Elsevier Science B.V.

引用

页码：220 / 232

页数：13

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