CHARGED-PARTICLE PAIR PRODUCTION ASSOCIATED WITH A LEPTON PAIR IN Z-DECAYS - INDICATION OF AN EXCESS IN THE TAU CHANNEL

被引：19

作者：

DECAMP, D ^{[1
]}

DESCHIZEAUX, B

GOY, C

LEES, JP

MINARD, MN

ALEMANY, R

CRESPO, JM

DELFINO, M

FERNANDEZ, E

GAITAN, V

GARRIDO, L

MIR, LM

PACHECO, A

CATANESI, MG

CREANZA, D

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

MAGGI, M

NATALI, S

NUZZO, S

QUATTROMINI, M

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

GAO, Y

HU, H

HUANG, D

HUANG, X

LIN, J

LOU, J

QIAO, C

RUAN, T

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ATWOOD, WB

BAUERDICK, LAT

BIRD, F

BLUCHER, E

BONVICINI, G

机构：

[1] CNRS, IN2P3, LAB PHYS PARTICULES LAPP, F-74019 ANNECY LE VIEUX, FRANCE

[2] UNIV AUTONOMA BARCELONA, LAB FIS ALTA ENERGIES, E-08193 BELLATERRA, BARCELONA, SPAIN

[3] IST NAZL FIS NUCL, SEZ BARI, I-70126 BARI, ITALY

[4] IST NAZL FIS NUCL, DIPARTIMENTO FIS UNIV, I-70126 BARI, ITALY

[5] ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

[6] SLAC, STANFORD, CA 94309 USA

[7] UNIV WASHINGTON, Seattle, WA 98195 USA

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

[9] UNIV BLAISE PASCAL, LAB PHYS CORPUSCULAIRE, F-63177 AUBIERE, FRANCE

[10] NIELS BOHR INST, DK-2100 Copenhagen, DENMARK

[11] NUCL RES CTR DEMOKRITOS NRCD, Athens, GREECE

[12] ECOLE POLYTECH, CNRS, IN2P3, LAB PHYS NUCL & HAUTES ENERGIES, F-91128 PALAISEAU, FRANCE

[13] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, ENGLAND

[14] UNIV FIRENZE, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY

[15] IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY

[16] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[17] FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA

[18] IST NAZL FIS NUCL, LNF, I-00044 FRASCATI, ITALY

[19] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND

[20] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY

[21] IMPERIAL COLL, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[22] UNIV INNSBRUCK, INST EXPT PHYS, A-6020 INNSBRUCK, AUSTRIA

[23] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[24] UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY

[25] CNRS, IN2P3, FAC SCI LUMINY, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE

[26] WERNER HEISENBERG INST PHYS, MAX PLANCK INST PHYS & ASTROPHYS, W-8000 MUNICH, GERMANY

[27] UNIV PARIS SUD, CNRS, IN2P3, LAB ACCELERATEUR LINEAIRE, F-91405 ORSAY, FRANCE

[28] UNIV PISA, DIPARTIMENTO FIS, INFN, SEZ PISA, I-56010 PISA, ITALY

[29] SCUOLA NORMALE SUPER, I-56010 PISA, ITALY

[30] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND

[31] RUTHERFORD APPLETON LAB, PARTICLE PHYS DEPT, DIDCOT OX11 0QX, OXON, ENGLAND

[32] CEN SACLAY, DEPT PHYS PARTICULES ELEMENTAIRES, F-91191 GIF SUR YVETTE, FRANCE

[33] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, ENGLAND

[34] UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY

[35] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[36] IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY

[37] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

[38] FAC SCI, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE

[39] UNIV TORINO, IST FIS GEN, Turin, ITALY

[40] CNR, IST COSMO GEOFIS, I-10126 Turin, ITALY

[41] CERN, PPE Div, CH-1211 Geneva 23, SWITZERLAND

[42] LBL, Berkeley, CA 94720 USA

来源：

PHYSICS LETTERS B | 1991年 / 263卷 / 01期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(91)91716-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a sample of 200 000 Z decays, events with two leptons and an additional pair of charged particles are studied. The 35 events found show a possible excess in the tau channel compared with the expectation from electroweak processes. The features of the events are consistent with radiation of virtual photons.

引用

页码：112 / 122

页数：11

共 12 条

[1] PRODUCTION OF LIGHT VECTOR-MESONS AT LEP
ABRAHAM, KJ
VANDERBIJ, JJ
[J]. PHYSICS LETTERS B, 1990, 248 (1-2) : 199 - 202
[2] MEASUREMENT OF THE PION FORM-FACTOR IN THE TIME-LIKE REGION FOR Q2 VALUES BETWEEN 0.1 (GEV/C)2 AND 0.18 (GEV/C)2
AMENDOLIA, SR
BADELEK, B
BATIGNANI, G
BECK, GA
BELLAMY, EH
BERTOLUCCI, E
BETTONI, D
BILOKON, H
BIZZETI, A
BOLOGNA, G
BOSISIO, L
BRADASCHIA, C
BUDINICH, M
DELLORSO, M
PIAZZOLI, BD
ENORINI, M
FABBRI, FL
FIDECARO, F
FOA, L
FOCARDI, E
FRANK, SGF
GIANNETTI, P
GIAZOTTO, A
GIORGI, MA
HARVEY, J
HEATH, GP
LANDON, MPJ
LAURELLI, P
LIELLO, F
MANNOCCHI, G
MARCH, PV
MARROCCHESI, PS
MENASCE, D
MENZIONE, A
MERONI, E
MILOTTI, E
MORONI, L
PICCHI, P
RAGUSA, F
RISTORI, L
ROLANDI, L
SALTMARSH, C
SAOUCHA, A
SATTA, L
SCRIBANO, A
STEFANINI, A
STRONG, JA
TENCHINI, R
TONELLI, G
TRIGGIANI, G
[J]. PHYSICS LETTERS B, 1984, 138 (5-6) : 454 - 458
[3] ELECTROMAGNETIC PION FORM-FACTOR IN THE TIMELIKE REGION
BARKOV, LM
CHILINGAROV, AG
EIDELMAN, SI
KHAZIN, BI
LELCHUK, MY
OKHAPKIN, VS
PAKHTUSOVA, EV
REDIN, SI
RYSKULOV, NM
SHATUNOV, YM
SHEKHTMAN, AI
SHWARTZ, BA
SIDOROV, VA
SKRINSKY, AN
SMAKHTIN, VP
SOLODOV, EP
[J]. NUCLEAR PHYSICS B, 1985, 256 (03) : 365 - 384
[4] MONTE-CARLO SIMULATION OF 2-PHOTON PROCESSES .1. RADIATIVE-CORRECTIONS TO MULTIPERIPHERAL E+E-MU+MU- PRODUCTION
BERENDS, FA
DAVERVELDT, PH
KLEISS, R
[J]. COMPUTER PHYSICS COMMUNICATIONS, 1986, 40 (2-3) : 271 - 284
[5] Z-DECAY INTO A VECTOR-MESON AND A LEPTON PAIR
BERGSTROM, L
ROBINETT, RW
[J]. PHYSICS LETTERS B, 1990, 245 (02) : 249 - 250
[6] DAVERVELDT P, 1985, THESIS RIJKSUNIVERSI
[7] ALEPH - A DETECTOR FOR ELECTRON-POSITRON ANNIHILATIONS AT LEP
DECAMP, D
DESCHIZEAUX, B
LEES, JP
MINARD, MN
CRESPO, JM
DELFINO, M
FERNANDEZ, E
MARTINEZ, M
MIQUEL, R
MIR, LM
ORTEU, S
PACHECO, A
PERLAS, JA
TUBAU, E
CATANESI, MG
DEPALMA, M
FARILLA, A
IASELLI, G
MAGGI, G
MASTROGIACOMO, A
NATALI, S
NUZZO, S
RANIERI, A
RASO, G
ROMANO, F
RUGGIERI, F
SELVAGGI, G
SILVESTRIS, L
TEMPESTA, P
ZITO, G
CHEN, Y
HU, H
HUANG, D
JIANG, Y
LIN, J
LIU, R
LU, W
RUAN, T
WANG, T
WANG, X
WU, D
WU, W
XIE, Y
XU, D
XU, R
XU, Y
YAN, W
YE, M
ZHANG, J
ZHAO, H
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1990, 294 (1-2) : 121 - 178
[8] SEARCHES FOR THE STANDARD HIGGS BOSON
DECAMP, D
DESCHIZEAUX, B
GOY, C
LEES, JP
MINARD, MN
ALEMANY, R
CRESPO, JM
DELFINO, M
FERNANDEZ, E
GAITAN, V
GARRIDO, L
MATO, P
MIQUEL, R
MIR, LM
ORTEU, S
PACHECO, A
PERLAS, JA
TUBAU, E
CATANESI, MG
CREANZA, D
DEPALMA, M
FARILLA, A
IASELLI, G
MAGGI, G
MAGGI, M
NATALI, S
NUZZO, S
QUATTROMINI, M
RANIERI, A
RASO, G
ROMANO, F
RUGGIERI, F
SELVAGGI, G
SILVESTRIS, L
TEMPESTA, P
ZITO, G
GAO, Y
HU, H
HUANG, D
JIN, S
LIN, J
RUAN, T
WANG, T
WU, W
XIE, Y
XU, D
XU, R
ZHANG, J
ZHAO, W
ALBRECHT, H
[J]. PHYSICS LETTERS B, 1990, 246 (1-2) : 306 - 314
[9] DECAMP D, CERN PPE9165 PREPR
[10] KURDADZE LM, 1983, JETP LETT+, V37, P733

← 1 2 →