Upsilon production in Z decays

被引：3

作者：

Acciarri, M

Adriani, O

AguilarBenitez, 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

Barone, L

Bartalini, P

Baschirotto, A

Basile, M

Battiston, R

Bay, A

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

机构：

[1] RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY

[2] RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY

[3] NIKHEF H, NATL INST HIGH ENERGY PHYS, NL-1009 DB AMSTERDAM, NETHERLANDS

[4] UNIV AMSTERDAM, NL-1009 DB AMSTERDAM, NETHERLANDS

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

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

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

[8] UNIV BASEL, INST PHYS, CH-4056 BASEL, SWITZERLAND

[9] INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA

[10] HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY

[11] UNIV BOLOGNA, I-40126 BOLOGNA, ITALY

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

[13] TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA

[14] BOSTON UNIV, BOSTON, MA 02215 USA

[15] NORTHEASTERN UNIV, BOSTON, MA 02115 USA

[16] INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA

[17] UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA

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

[19] HARVARD UNIV, CAMBRIDGE, MA 02139 USA

[20] MIT, CAMBRIDGE, MA 02139 USA

[21] IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY

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

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

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

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

[26] UNIV SCI & TECHNOL CHINA, HEFEI 230029, ANHUI, PEOPLES R CHINA

[27] RES INST HIGH ENERGY PHYS, SEFT, SF-00014 HELSINKI, FINLAND

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

[29] IST NAZL FIS NUCL, I-73100 LECCE, ITALY

[30] UNIV LECCE, I-73100 LECCE, ITALY

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

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

[33] CIEMAT, E-28040 MADRID, SPAIN

[34] IST NAZL FIS NUCL, I-20133 MILAN, ITALY

[35] INST THEORET & EXPT PHYS, MOSCOW 117259, RUSSIA

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

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

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

[39] CATHOLIC UNIV NIJMEGEN, NL-6525 ED NIJMEGEN, NETHERLANDS

[40] NATL INST NUCL PHYS & HIGH ENERGY PHYS, NL-6525 ED NIJMEGEN, NETHERLANDS

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

[42] CALTECH, PASADENA, CA 91125 USA

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

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

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

[46] PRINCETON UNIV, PRINCETON, NJ 08544 USA

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

[48] UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY

[49] RUSSIAN ACAD SCI, INST NUCL PHYS, ST PETERSBURG, RUSSIA

[50] UNIV SALERNO, I-84100 SALERNO, ITALY

来源：

PHYSICS LETTERS B | 1997年 / 413卷 / 1-2期

基金：

中国国家自然科学基金; 匈牙利科学研究基金会;

关键词：

D O I：

10.1016/S0370-2693(97)01002-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched for evidence of T production in 3.5 million hadronic Z decays collected by the L3 detector at LEP in 1991-1995. No signals are observed for the decay chain Z --> TX; T --> l(+)l(-) (l= e,mu), therefore upper limits at the 95% confidence level are set on the following Z branching fractions: Br(Z --> T(1S)X)<5.5 X 10(-5); Br(Z --> T(2S)X)<13.9 X 10(-5); Br(Z --> T(3S)X)<9.4 X 10(-5). Published by Elsevier Science B.V.

引用

页码：167 / 175

页数：9

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