Measurements with photonic events in e(+)e(-) collisions at centre-of-mass energies of 130-140 GeV

被引：18

作者：

Alexander, G

Allison, J

Altekamp, N

Ametewee, K

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Beaudoin, G

Bechtluft, J

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Berlich, P

Bethke, S

Biebel, O

Blobel, V

Bloodworth, IJ

Bloomer, JE

Bock, P

Bosch, HM

Boutemeur, M

Bouwens, BT

Braibant, S

Brown, RM

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlesworth, C

Charlton, DG

Chrisman, D

Chu, SL

Clarke, PEL

Cohen, I

Conboy, JE

机构：

[1] UNIV OREGON,DEPT PHYS,EUGENE,OR 97403

[2] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

[3] CEA,DAPNIA,SPP,F-91191 GIF SUR YVETTE,FRANCE

[4] TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL

[5] UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN

[6] UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS,TOKYO 113,JAPAN

[7] KOBE UNIV,KOBE 657,JAPAN

[8] BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND

[9] WEIZMANN INST SCI,PARTICLE PHYS DEPT,IL-76100 REHOVOT,ISRAEL

[10] UNIV HAMBURG,DESY,INST EXPTL PHYS 2,D-22607 HAMBURG,GERMANY

[11] UNIV VICTORIA,DEPT PHYS,VICTORIA,BC V8W 3P6,CANADA

[12] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER,BC V6T 1Z1,CANADA

[13] UNIV ALBERTA,DEPT PHYS,EDMONTON,AB T6G 2J1,CANADA

[14] DUKE UNIV,DEPT PHYS,DURHAM,NC 27708

[15] RES INST PARTICLE & NUCL PHYS,H-1525 BUDAPEST,HUNGARY

[16] INST NUCL RES,H-4001 DEBRECEN,HUNGARY

[17] UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND

[18] UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY

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

[20] UNIV BONN,INST PHYS,D-53115 BONN,GERMANY

[21] UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521

[22] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND

[23] CARLETON UNIV,DEPT PHYS,OTTAWA CARLETON INST PHYS,OTTAWA,ON K1S 5B6,CANADA

[24] CARLETON UNIV,CTR RES PARTICLE PHYS,OTTAWA,ON K1S 5B6,CANADA

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

[26] UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637

[27] UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637

[28] UNIV FREIBURG,FAK PHYS,D-79104 FREIBURG,GERMANY

[29] UNIV HEIDELBERG,INST PHYS,D-69120 HEIDELBERG,GERMANY

[30] INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405

[31] UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND

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

[33] UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND

[34] UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND

[35] UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742

[36] UNIV MONTREAL,PHYS NUCL LAB,MONTREAL,PQ H3C 3J7,CANADA

[37] TRIUMF,VANCOUVER,BC V6T 2A3,CANADA

[38] LAJOS KOSSUTH UNIV,DEPT EXPT PHYS,DEBRECEN,HUNGARY

[39] UNIV MUNICH,MUNICH,GERMANY

来源：

PHYSICS LETTERS B | 1996年 / 377卷 / 1-3期

基金：

加拿大自然科学与工程研究理事会; 以色列科学基金会;

关键词：

D O I：

10.1016/0370-2693(96)00488-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cross-sections and angular distributions for the production of events with single and multiple photons are measured from data recorded with the OPAL detector at the recently upgraded LEP collider. The measured cross-sections are generally consistent with Standard Model expectations for the e(+)e(-) --> <nu(nu)over bar gamma(gamma)> and e(+)e(-) --> gamma gamma(gamma) processes. Six events with an acoplanar photon pair and large missing mass are found. The observed number of events is larger than expected from e(+)e(-) --> <nu(nu)over bar gamma gamma>; however, the missing mass distribution is compatible with the Z(0) resonance. Deviations from QED are constrained by the data on e(+)e(-) --> gamma gamma(gamma). Lower limits are set at 95% confidence level on the QED cut-off parameters Lambda(+) and Lambda(-) of 152 GeV and 142 GeV, respectively, and also on the mass of an excited electron of 147 GeV.

引用

页码：222 / 234

页数：13

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