A MEASUREMENT OF THE MEAN LIFETIMES OF CHARGED AND NEUTRAL B-HADRONS

被引：20

作者：

ABREU, P

ADAM, W

ADYE, T

AGASI, E

AJINENKO, I

ALEKSAN, R

ALEKSEEV, GD

ALGERI, A

ALLEN, P

ALMEHED, S

ALVSVAAG, SJ

AMALDI, U

ANDREAZZA, A

ANTILOGUS, P

APEL, WD

APSIMON, RJ

ARNOUD, Y

ASMAN, B

AUGUSTIN, JE

AUGUSTINUS, A

BAILLON, P

BAMBADE, P

BARAO, F

BARATE, R

BARBIELLINI, G

BARDIN, DY

BARKER, GJ

BARONCELLI, A

BARRING, O

BARRIO, JA

BARTL, W

BATES, MJ

BATTAGLIA, M

BAUBILLIER, M

BECKS, KH

BEESTON, CJ

BEGALLI, M

BEILLIERE, P

BELOKOPYTOV, Y

BELTRAN, P

BENEDIC, D

BENVENUTI, AC

BERGGREN, M

BERTRAND, D

BIANCHI, F

BILENKY, MS

BILLOIR, P

BJARNE, J

BLOCH, D

BLYTH, S

机构：

[1] IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA

[2] IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA

[3] UNIV INSTELLING ANTWERPEN, DEPT PHYS, B-2610 Antwerp, BELGIUM

[4] UUB, ULB, IIHE, B-1050 BRUSSELS, BELGIUM

[5] UNIV ETAT MONS, FAC SCI, B-7000 MONS, BELGIUM

[6] UNIV ATHENS, PHYS LAB, GR-10680 ATHENS, GREECE

[7] UNIV BERGEN, DEPT PHYS, B-5007 BERGEN, BELGIUM

[8] UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY

[9] INFN, I-40126 BOLOGNA, ITALY

[10] COLL FRANCE, IN2P3, PHYS CORPUSCULAIRE LAB, CNRS, F-75231 PARIS 05, FRANCE

[11] CERN, CH-1211 GENEVA 23, SWITZERLAND

[12] ULP, IN2P3, CTR RECH NUCL, CNRS, F-67037 STRASBOURG, FRANCE

[13] NCSR DEMOKRITOS, INST NUCL PHYS, GR-15310 ATHENS, GREECE

[14] CAS, INST PHYS, FZU, DIV HIGH ENERGY PHYS, CS-18040 PRAGUE 8, CZECHOSLOVAKIA

[15] UNIV GENOA, DIPARTIMENTO FIS, I-16146 GENOA, ITALY

[16] INFN, I-16146 GENOA, ITALY

[17] UNIV GRENOBLE 1, INST SCI NUCL, CNRS, IN2P3, F-38026 ST MARTIN DHERES, FRANCE

[18] SEFT, HIGH ENERGY PHYS RES INST, SF-00170 HELSINKI, FINLAND

[19] JOINT INST NUCL RES, MOSCOW 101000, RUSSIA

[20] UNIV KARLSRUHE, INST EXPTL KERNPHYS, W-7500 KARLSRUHE 1, GERMANY

[21] INST NUCL PHYS, HIGH ENERGY, PHYS LAB, PL-30055 KRAKOW 30, POLAND

[22] CTR BRASILEIRO PESQUISAS FIS, BR-22290 RIO DE JANEIRO, BRAZIL

[23] UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, CNRS, IN2P3, F-91405 ORSAY, FRANCE

[24] UNIV LANCASTER, SCH PHYS & MAT, LANCASTER LA1 4YB, ENGLAND

[25] UNIV LIVERPOOL, DEPT PHYS, LIVERPOOL L69 3BX, ENGLAND

[26] UNIV PARIS 06 & 7, LPHNE, CNRS, IN2P3, F-75252 PARIS 05, FRANCE

[27] LUND UNIV, DEPT PHYS, S-22363 LUND, SWEDEN

[28] UNIV LYON 1, IPNL, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE

[29] UNIV COMPLUTENSE MADRID, E-28040 MADRID, SPAIN

[30] UNIV AIX MARSEILLE 2, CPP, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE

[31] UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY

[32] INFN, I-20133 MILAN, ITALY

[33] NIELS BOHR INST, DK-2100 COPENHAGEN 0, DENMARK

[34] CHARLES UNIV, NC, NUCL CTR MFF, CS-18000 PRAGUE 8, CZECHOSLOVAKIA

[35] NATL INST NUCL PHYS & HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS

[36] NATL TECH UNIV ATHENS, DEPT PHYS, GR-15773 ATHENS, GREECE

[37] UNIV OSLO, DEPT PHYS, N-1000 OSLO 3, NORWAY

[38] UNIV OVIEDO, DEPT FIS, E-33006 OVIEDO, SPAIN

[39] UNIV OXFORD, DEPT PHYS, OXFORD OX1 3RH, ENGLAND

[40] UNIV PADUA, DIPARTIMENTO FIS, I-35131 PADUA, ITALY

[41] INFN, I-35131 PADUA, ITALY

[42] PONTIFICIA UNIV CATOLICA, DEPT FIS, BR-22453 RIO DE JANEIRO, BRAZIL

[43] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[44] UNIV ROMA TOR VERGATA, DIPARTIMENTO FIS, I-00173 ROME, ITALY

[45] INFN, I-00173 ROME, ITALY

[46] CTR ETUD SACLAY, DAPNIA, DSM, F-91191 GIF SUR YVETTE, FRANCE

[47] UNIV SALERNO, DIPARTIMENTO FIS, I-84100 SALERNO, ITALY

[48] INFN, IST SUPER SANITA, I-00161 ROME, ITALY

[49] UNIV CANTABRIA, CSIC, CEAFM, E-39006 SANTANDER, SPAIN

[50] MOSCOW HIGH ENERGY PHYS INST, MOSCOW, RUSSIA

来源：

PHYSICS LETTERS B | 1993年 / 312卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(93)90520-R

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decays of B-hadrons have been reconstructed using the charged particles recorded in the DELPHI silicon microstrip detector. The sum of the charges of the secondaries determines the charge of the B-hadron parent. Some 232 114 multihadronic Z0 decays recorded during the 1991 run of LEP at centre-of-mass energies between 88.2 GeV and 94.2 GeV yield 253 B-hadron candidates with well-measured charge. From these the mean lifetimes of neutral and charged B-hadrons are found to be 1.44 +/- 0.21(stat.) +/- 0.14(syst.) ps and 1.56 +/- 0.19(stat.) +/- 0.13(syst.) ps respectively. The ratio of their lifetimes is 1.09(-0.23)+0.28 (Stat.) +/- 0.11 (syst.). Under some assumptions on the abundance and lifetime of the LAMBDA(b)0 and B(s)0 states, the B0 and B+ lifetimes are inferred.

引用

页码：253 / 266

页数：14

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