Photonic events with large missing energy in e+e(-) collisions at root s=161 GeV

被引：9

作者：

Ackerstaff, K

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

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

Bobinski, E

Bock, P

Bosch, HM

Boutemeur, M

Bouwens, BT

Braibant, S

Brown, RM

Buguzzi, A

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Clarke, PEL

Cohen, I

Conboy, JE

机构：

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

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

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

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

[5] CAVENDISH LAB,CAMBRIDGE CB3 OHE,ENGLAND

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[23] TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL

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

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

[26] KOBE UNIV,KOBE 657,JAPAN

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

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

[29] UNIV HAMBURG,DESY,INST EXPT PHYS 2,D-22607 HAMBURG,GERMANY

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

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

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

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

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

[35] UNIV MUNICH,SEKT PHYS,D-85748 GARCHING,GERMANY

来源：

PHYSICS LETTERS B | 1997年 / 391卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(96)01554-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Photonic events with large missing energy have been observed with the OPAL detector at LEP using two search topologies. The first topology looks for events with significant missing energy and at least one photon in \cos theta\ < 0.7 with large scaled energy, x(gamma) > 0.2. The second topology looks for events with an acoplanar photon pair where both photons are in \cos theta\ < 0.7 and have energy exceeding 1.75 GeV, In the data sample corresponding to an integrated luminosity of 10.0 pb(-1), 11 events are selected for the first topology and a cross-section of 1.6 +/- 0.5 pb is measured within the kinematic acceptance, consistent with that expected for the Standard Model process e(+)e(-) --> nu<(nu)over bar>gamma(gamma). No events are selected for the second topology giving a 95% CL cross-section upper limit of 0.41 pb within the kinematic acceptance. Upper limits on the cross-section times branching ratio for new particle production are also derived.

引用

页码：210 / 220

页数：11

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