MEASUREMENT OF GAMMA-B(B)OVER-BAR/GAMMA(HAD) FROM HADRONIC DECAYS OF THE Z

被引：39

作者：

ADRIANI, O

AGUILARBENITEZ, M

AHLEN, S

ALCARAZ, J

ALOISIO, A

ALVERSON, G

ALVIGGI, MG

AMBROSI, G

AN, Q

ANDERHUB, H

ANDERSON, AL

ANDREEV, VP

ANTONOV, L

ANTREASYAN, D

ARCE, P

AREFIEV, A

ATAMANCHUK, A

AZEMOON, T

AZIZ, T

BABA, PVKS

BACHMANN, S

BAGNAIA, P

BAKKEN, JA

BAKSAY, L

BALL, RC

BANERJEE, S

BAO, J

BARILLERE, R

BARONE, L

BASCHIROTTO, A

BATTISTON, R

BAY, A

BECATTINI, F

BECKER, U

BEHNER, F

BEHRENS, J

BENCZE, GL

BERDUGO, J

BERGES, P

BERTUCCI, B

BETEV, BL

BIASINI, M

BILAND, A

BILEI, GM

BIZZARRI, R

BLAISING, JJ

BOBBINK, GJ

BOCK, R

BOHM, A

BORGIA, B

机构：

[1] UNIV FLORENCE, I-50125 FLORENCE, ITALY

[2] RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY

[3] RHEIN WESTFAL TH AACHEN, INST PHYS 2, W-5100 AACHEN, GERMANY

[4] NIKEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS

[5] UNIV MICHIGAN, ANN ARBOR, MI 48109 USA

[6] CNRS, IN2P3, LAPP, F-74941 ANNECY LE VIEUX, FRANCE

[7] JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA

[8] IHEP, BEIJING 100039, PEOPLES R CHINA

[9] INFN, I-40126 BOLOGNA, ITALY

[10] TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA

[11] BOSTON UNIV, BOSTON, MA 02215 USA

[12] NORTHEASTERN UNIV, BOSTON, MA 02115 USA

[13] HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY

[14] HARVARD UNIV, CAMBRIDGE, MA 02138 USA

[15] MIT, CAMBRIDGE, MA 02139 USA

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

[17] WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND

[18] UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND

[19] USTC, HEFEI 230029, PEOPLES R CHINA

[20] UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND

[21] LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA

[22] LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA

[23] UNIV LYON 1, CNRS, IN2P3, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE

[24] CIEMAT, E-28040 MADRID, SPAIN

[25] INFN, I-20133 MILAN, ITALY

[26] ITEP, MOSCOW, RUSSIA

[27] INFN, I-80125 NAPLES, ITALY

[28] UNIV NAPLES, I-80125 NAPLES, ITALY

[29] UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS

[30] UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS

[31] NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS

[32] OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA

[33] CALTECH, PASADENA, CA 91125 USA

[34] INFN, I-06100 PERUGIA, ITALY

[35] UNIV PERUGIA, I-06100 PERUGIA, ITALY

[36] CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA

[37] PRINCETON UNIV, PRINCETON, NJ 08544 USA

[38] INFN, I-00185 ROME, ITALY

[39] ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA

[40] UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA

[41] UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN

[42] SIC, SHANGHAI, PEOPLES R CHINA

[43] BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA

[44] KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA

[45] UNIV ALABAMA, TUSCALOOSA, AL 35486 USA

[46] PURDUE UNIV, W LAFAYETTE, IN 47907 USA

[47] PSI, CH-5232 VILLIGEN, SWITZERLAND

[48] DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY

[49] SWISS FED INST TECHNOL, CH-8092 ZURICH, SWITZERLAND

[50] UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY

来源：

PHYSICS LETTERS B | 1993年 / 307卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(93)90214-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report a measurement of R(b) = GAMMA(bbBAR)GAMMA(had) from Z --> qqBAR events at LEP. Z --> bbBAR events are identified using a multidimensional analysis based on a neural network approach. We obtain 60% sample purity with an efficiency of 35%. Our measured value of R(b) is 0.222 +/- 0.003 +/- 0.007.

引用

页码：237 / 246

页数：10

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