Measurement of the mass of the Lambda(b) baryon

被引：15

作者：

Buskulic, D

DeBonis, I

Decamp, D

Ghez, P

Goy, C

Lees, JP

Lucotte, A

Minard, MN

Odier, P

Pietrzyk, B

Casado, MP

Chmeissani, M

Crespo, JM

Delfino, M

Efthymiopoulos, I

Fernandez, E

FernandezBosman, M

Garrido, LI

Juste, A

Martinez, M

Orteu, S

Pacheco, A

Padilla, C

Pascual, A

Perlas, JA

Riu, I

Sanchez, F

Teubert, F

Colaleo, A

Creanza, D

dePalma, M

Gelao, G

Girone, M

Iaselli, G

Maggi, G

Maggi, M

Marinelli, N

Nuzzo, S

Ranieri, A

Raso, G

Ruggieri, F

Selvaggi, G

Silvestris, L

Tempesta, P

Zito, G

Huang, X

Lin, J

Ouyang, Q

Wang, T

Xie, Y

机构：

[1] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BELLATERRA, BARCELONA, SPAIN

[2] IST NAZL FIS NUCL, DIPARTIMENTO FIS, SEZ BARI, I-70126 BARI, ITALY

[3] ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

[4] EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[5] UNIV CLERMONT FERRAND, PHYS CORPUSCULAIRE LAB, IN2P3, CNRS, F-63177 CLERMONT FERRAND, FRANCE

[6] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK

[7] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE

[8] ECOLE POLYTECH, IN2P3, CNRS, LAB PHYS NUCL & HAUTES ENERGIES, F-91128 PALAISEAU, FRANCE

[9] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND

[10] UNIV FLORENCE, DIPARTIMENTO FIS, IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY

[11] FLORIDA STATE UNIV, SUPERCOMP COMPUT RES INST, TALLAHASSEE, FL 32306 USA

[12] IST NAZL FIS NUCL, LAB NAZL, I-00044 FRASCATI, ITALY

[13] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND

[14] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, D-69120 HEIDELBERG, GERMANY

[15] UNIV LONDON IMPERIAL COLL SCI & TECHNOL, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[16] UNIV INNSBRUCK, INST PHYS EXPTL, A-6020 INNSBRUCK, AUSTRIA

[17] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[18] UNIV MAINZ, INST PHYS, D-55099 MAINZ, GERMANY

[19] FAC SCI LUMINY, CTR PHYS PARTICLES, IN2P3, CNRS, F-13288 MARSEILLE, FRANCE

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

[21] IST NAZL FIS NUCL, SEZ MILANO, I-20133 MILAN, ITALY

[22] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, D-80805 MUNICH, GERMANY

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

[24] UNIV PISA, IST NAZL FIS NUCL, SEZ PISA, DIPARTIMENTO FIS, I-56010 PISA, ITALY

[25] SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY

[26] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND

[27] RUTHERFORD APPLETON LAB, PARTICLE PHYS DEPT, DIDCOT OX11 0QX, OXON, ENGLAND

[28] CENS, CEA, DAPNIA, SERV PHYS PARTICLES, F-91191 GIF SUR YVETTE, FRANCE

[29] UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA

[30] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND

[31] UNIV SIEGEN, FACHBEREICH PHYS, D-57068 SIEGEN, GERMANY

[32] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[33] IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY

[34] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[35] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

[36] UNIV TURIN, IST FIS GEN, TURIN, ITALY

[37] CNR, IST COSMOGEOFIS, I-10126 TURIN, ITALY

[38] FLORIDA STATE UNIV, SUPERCOMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[39] UNIV BARCELONA, E-08208 BARCELONA, SPAIN

[40] KANGNUNG NATL UNIV, KANGNUNG, SOUTH KOREA

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

[42] UNIV SASSARI, IST MATEMAT & FIS, I-07100 SASSARI, ITALY

来源：

PHYSICS LETTERS B | 1996年 / 380卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(96)00659-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a data sample of four million hadronic Z decays collected with the ALEPH detector at LEP, four Lambda(b) baryon candidates are exclusively reconstructed in the Lambda(b) --> Lambda(c)(+) pi(-) channel, with the Lambda(c)(+) decaying into pK(-) pi(+), <p(K)over bar (0)> or Lambda pi(+) pi(+) pi(-). The probability of the observed signal to be due to a background fluctuation is estimated to be 4.2 x 10(-4). The mass of the Lambda(b) is measured to be 5614 +/- 21 (stat.) +/- 4 (syst.) MeV/c(2).

引用

页码：442 / 452

页数：11

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