INCLUSIVE J-PRODUCTION IN Z(0) DECAYS

被引：20

作者：

ADRIANI, O

AGUILARBENITEZ, M

AHLEN, S

AKBARI, H

ALCARAZ, J

ALOISIO, A

ALVERSON, G

ALVIGGI, MG

AMBROSI, G

AN, Q

ANDERHUB, H

ANDERSON, AL

ANDREEV, VP

ANGELOV, T

ANTONOV, L

ANTREASYAN, D

ARCE, P

AREFIEV, A

ATAMANCHUK, A

AZEMOON, T

AZIZ, T

BABA, PVKS

BAGNAIA, P

BAKKEN, JA

BAKSAY, L

BALL, RC

BANERJEE, S

BAO, J

BARILLERE, R

BARONE, L

BATTISTON, R

BAY, A

BECATTINI, F

BECKER, U

BEHNER, F

BEHRENS, J

BEINGESSNER, S

BENCZE, GL

BERDUGO, J

BERGES, P

BERTUCCI, B

BETEV, BL

BIASINI, M

BILAND, A

BILEI, GM

BIZZARRI, R

BLAISING, JJ

BLUMENFELD, B

BOBBINK, GJ

BOCCIOLINI, M

机构：

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

[2] CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN

[3] BOSTON UNIV, BOSTON, MA 02215 USA

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

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

[6] IST NAZL FIS NUCL, I-80125 NAPLES, ITALY

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

[8] NORTHEASTERN UNIV, BOSTON, MA 02115 USA

[9] IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY

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

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

[12] SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND

[13] MIT, CAMBRIDGE, MA 02139 USA

[14] ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, USSR

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

[16] IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY

[17] MOSCOW THEORET & EXPTL PHYS INST, 117259 MOSCOW, USSR

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

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

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

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

[22] IST NAZL FIS NUCL, I-00185 ROME, ITALY

[23] UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY

[24] PRINCETON UNIV, PRINCETON, NJ 08544 USA

[25] UNIV ALABAMA, TUSCALOOSA, AL 35486 USA

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

[27] LAB PHYS PARTICULES, F-74941 ANNECY LE VIEUX, FRANCE

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

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

[30] CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS

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

[32] UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA

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

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

[35] UNIV LYON 1, INST PHYS NUCL LYON, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, F-69622 VILLEURBANNE, FRANCE

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

[37] LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA

[38] IST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

[39] CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA

[40] OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA

[41] PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND

[42] SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA

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

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

[45] CALTECH, PASADENA, CA 91125 USA

[46] HARVARD UNIV, CAMBRIDGE, MA 02139 USA

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

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

来源：

PHYSICS LETTERS B | 1992年 / 288卷 / 3-4期

基金：

美国安德鲁·梅隆基金会;

关键词：

D O I：

10.1016/0370-2693(92)91121-O

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Inclusive J production in Z0 decays is observed via the leptonic decay mode J --> l+ l- (l = e,mu). We measure the branching ratio Br(Z0 --> J + X) = (4.1 +/- 0.7 (stat.) +/- 0.3 (sys.)) x 10(-3). We have calculated the fraction of the J mesons from b-hadron decay and find a branching ratio of Br(b --> J + X) = (1.3 +/- 0.2 (stat.) +/- 0.2 (sys.)) x 10(-2). We determine the average fractional energy of bottom hadrons [x(E)] = 0.70 +/- 0.03 (stat. ) +0.02/-0.01 (sys. ) using the momentum spectrum of the J mesons. From a study of the angle between the J and the most energetic jet, we set an upper limit on the branching ratio Br(Z0 --> qqg*BAR;g* --> J + X) < 7.0 x 10(-4) at 90% confidence level.

引用

页码：412 / 420

页数：9

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