Search for excited leptons in e(+)e(-) collisions at root s=161 GeV

被引：17

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, M

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

Charlton, DG

Chrisman, D

Clarke, PEL

Cohen, I

Conboy, JE

Cooke, OC

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[34] 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)01553-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched for excited states of charged and neutral leptons, e*, mu*, tau* and nu*, in e(+)e(-) collisions at root s = 161 GeV using the OPAL detector at LEP. No evidence for their existence was found. With the most common coupling assumptions, the topologies from excited lepton pair production include l(+)l(-)gamma gamma and l(+)l(-)W(+)W(-), with the subsequent decay of the virtual W bosons, From the analysis of these topologies, 95% confidence level lower mass limits of 79.9 GeV for e*, 80.0 GeV for mu*, 79.1 GeV for tau*, 78.3 GeV for nu(e)*, 78.9 GeV for nu(mu)*; and 76.2 GeV for nu(tau)* are inferred. From the analysis of W+W- and gamma gamma topologies with missing energy and using alternative coupling assignments which favour charged l*(+/-) and photonic nu* decays, 95% confidence level lower mass limits of 77.1 GeV for each l*(+/-) flavour and 77.8 GeV for each nu* flavour are inferred. From the analysis of the l(+)l(-)gamma, l(+/-)W(+/-) and single gamma final states expected from excited lepton single production, upper limits on the ratio of the coupling to the compositeness scale, f/Lambda, are determined for excited lepton masses up to the kinematic limit.

引用

页码：197 / 209

页数：13

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