Observation of multiple hard photon final states at root s=130-140 GeV at LEP

被引：15

作者：

Acciarri, M ^{[35
]}

Adam, A

Adriani, O

AguilarBenitez, M

Ahlen, S

Alpat, B

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alverson, G

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Antreasyan, D

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Baksay, L

Ball, RC

Banerjee, S

Banicz, K

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

Biasini, M

Biland, A

Bilei, GM

Blaising, JJ

Blyth, SC

Bobbink, GJ

Bock, R

Bohm, A

Borgia, B

Boucham, A

Bourilkov, D

机构：

[1] RHEIN WESTFAL TH AACHEN, INST PHYS 2, 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] LAB ANNECY LE VIEUX PHYS PARTICULES, LAPP,IN2P3,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] LOUISIANA STATE UNIV, BATON ROUGE, LA 70803 USA

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

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

[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] HUNGARIAN ACAD SCI, INST ATOM PHYS, H-1525 BUDAPEST 114, HUNGARY

[20] HARVARD UNIV, CAMBRIDGE, MA 02139 USA

[21] MIT, CAMBRIDGE, MA 02139 USA

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

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

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

[25] WORLD LAB, FBLIA PROJECT, CH-1211 GENEVA 23, SWITZERLAND

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

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

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

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

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

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

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

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

[34] CIEMAT, E-28040 MADRID, SPAIN

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

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

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

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

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

[40] UNIV NIJMEGEN, NL-6525 ED NIJMEGEN, NETHERLANDS

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

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

[43] CALTECH, PASADENA, CA 91125 USA

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

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

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

[47] PRINCETON UNIV, PRINCETON, NJ 08544 USA

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

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

[50] INST PHYS NUCL, ST PETERSBURG, RUSSIA

来源：

PHYSICS LETTERS B | 1996年 / 384卷 / 1-4期

基金：

匈牙利科学研究基金会;

关键词：

D O I：

10.1016/0370-2693(96)00612-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have studied the process e(+)e(-)-->n gamma (n greater than or equal to 2) at an average center-of-mass energy of 133 GeV using the L3 detector at LEP. For an integrated luminosity of 4.95 pb(-1) we find one gamma gamma gamma gamma(gamma) final state with only hard photons. The rates of both gamma gamma gamma and gamma gamma events are consistent with QED expectations. The cross section of the reaction e(+)e(-) -->gamma gamma(gamma) in the polar range 16 degrees<theta(gamma)<164 degrees is measured to be 22.6+/-2.2 ph. Decays into photons of narrow scalar resonances with masses between 90 and 130 GeV are not observed. The observation of the event with four energetic photons is consistent with QED although the kinematic configuration of the photons is atypical.

引用

页码：323 / 332

页数：10

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