A DIRECT DETERMINATION OF THE NUMBER OF LIGHT NEUTRINO FAMILIES FROM E+E--]NU-NU-BAR-GAMMA AT LEP

被引:28
作者
ADEVA, B
ADRIANI, O
AGUILARBENITEZ, M
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
BLOMEKE, P
BLUMENFELD, B
BOBBINK, GJ
机构
[1] IST NAZL FIS NUCL,SEZ FIRENZE,I-50125 FLORENCE,ITALY
[2] UNIV FLORENCE,I-50125 FLORENCE,ITALY
[3] CTR INVEST ENERGETICAS MEDIOAMBIENTALES & TECNOL,E-28040 MADRID,SPAIN
[4] JOHNS HOPKINS UNIV,BALTIMORE,MD 21218
[5] NAPLES UNIV,I-80125 NAPLES,ITALY
[6] IST NAZL FIS NUCL,SEZ NAPOLI,I-80125 NAPLES,ITALY
[7] NORTHEASTERN UNIV,BOSTON,MA 02115
[8] UNIV PERUGIA,I-06100 PERUGIA,ITALY
[9] IST NAZL FIS NUCL,SEZ PERUGIA,I-06100 PERUGIA,ITALY
[10] WORLD LAB,FBLJA PROJECT,CH-1211 GENEVA,SWITZERLAND
[11] SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND
[12] MIT,CAMBRIDGE,MA 02139
[13] ST PETERSBURG NUCL PHYS INST,ST PETERSBURG 188350,USSR
[14] UNIV LYON 1,INST PHYS NUCL LYON,CNRS,F-69622 VILLEURBANNE,FRANCE
[15] PURDUE UNIV,W LAFAYETTE,IN 47907
[16] UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550
[17] INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA
[18] UNIV SCI & TECHNOL CHINA,HEFEI 230029,PEOPLES R CHINA
[19] OAK RIDGE NATL LAB,OAK RIDGE,TN 37830
[20] CATHOLIC UNIV NIJMEGEN,NIJMEGEN,NETHERLANDS
[21] NATL INST NUCL PHYS & HIGH ENERGY PHYS,6525 ED NIJMEGEN,NETHERLANDS
[22] PAUL SCHERRER INST,WURENLINGEN,SWITZERLAND
[23] SHANGHAI INST CERAM,SHANGHAI,PEOPLES R CHINA
[24] INST HOCHENERGIEPHYS,O-1615 ZEUTHEN,GERMANY
[25] UNIV LAUSANNE,CH-1015 LAUSANNE,SWITZERLAND
[26] CALTECH,PASADENA,CA 91125
[27] HARVARD UNIV,CAMBRIDGE,MA 02139
[28] UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY
[29] CLANP,CENT LAB AUTOMAT & INSTRUMENTAT,SOFIA,BULGARIA
[30] IST NAZL FIS NUCL,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY
[31] UNIV MICHIGAN,ANN ARBOR,MI 48109
[32] TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA
[33] UNIV ROME LA SAPIENZA,I-00185 ROME,ITALY
[34] IST NAZL FIS NUCL,SEZ ROMA,I-00185 ROME,ITALY
[35] UNIV ALABAMA,TUSCALOOSA,AL 35486
[36] UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND
[37] LAB PHYS PARTICULES,F-74519 ANNECY LE VIEUX,FRANCE
[38] HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST 114,HUNGARY
[39] RHEIN WESTFAL TH AACHEN,INST PHYS 1,W-5100 AACHEN,GERMANY
[40] RHEIN WESTFAL TH AACHEN,INST PHYS 3,W-5100 AACHEN,GERMANY
[41] NATL INST NUCL PHYS & HIGH ENERGY PHYS,NATL INST HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS
[42] UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92182
[43] CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213
[44] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544
关键词
D O I
10.1016/0370-2693(92)90877-7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The L3 detector at LEP has been used to determine the number of light neutrino families by measuring the cross section of single photon even in e+e- collisions at energies near the Z0 resonance. We have observed 61 single photon candidates with more than 1.5 GeV of deposited energy in the barrel electromagnetic calorimeter, for a total integrated luminosity of 3.0 pb-1. From a likelihood fit to the single photon cross sections, we determine N(nu) = 3.24 +/- 0.46 (statistical) +/- 0.22 (systematic).
引用
收藏
页码:209 / 221
页数:13
相关论文
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