Search for lepton flavour violation in Z decays

O Adriani,Manuel Aguilar-Benitez,S. Ahlen,J. Alcaraz,Alberto Aloisio,G. Alverson,M. G. Alviggi,Giovanni Ambrosi,Q. An,H. Anderhub,A. L. Anderson,V. P. Andreev,T. Angelescu,L. Antonov,D. Antreasyan,P. Arce,A. Arefiev,A Atamanchuk,T. Azemoon,T. Aziz,P.V.K.S. Baba,Paolo Bagnaia,J. A. Bakken,R. C. Ball,Swagato Banerjee,J. Bao,R Barillère,L. Barone,Andrea Baschirotto,R. Battiston,A. Bay,F. Becattini,J. Bechtluft,R. Becker,U Becker,F. Behner,J. Behrens,Gy L. Bencze,J. Berdugo,P Berges,B. Bertucci,Bl Betev,Maurizio Biasini,A. Biland,G. M. Bilei,R. Bizzarri,J.J. Blaising,G. J. Bobbink,R. Bock,A. Böhm,B. Borgia,M. Bosetti,D. Bourilkov,M. Bourquin,D. Boutigny,B. Bouwens,E. Brambilla,J. G. Branson,Ic Brock,M. Brooks,A. Bujak,J.D Burger,Wj Burger,J. Busenitz,A. Buytenhuijs,X.D. Cai,M Capell,M. Caria,G Carlino,Am Cartacci,Rinaldo Castello,Marcos Cerrada,F. Cesaroni,Y. H. Chang,Uk Chaturvedi,M. Chemarin,A. Chen,C. Chen,G. Chen,G. M. Chen,H.F. Chen,H. S. Chen,M. Y. Chen,W. Y. Chen,G. Chiefari,C.Y Chien,M. T. Choi,S. Chung,C Civinini,I Clare,R Clare,T.E. Coan,H.O. Cohn,G Coignet,N. Colino,A. Contin,F Cotorobai,X.T. Cui,X.Y. Cui,T.S Dai,R DAlessandro,R. de Asmundis,A Degré,K. Deiters,E. Dénes,Peter Denes,F. DeNotaristefani,M. Dhina,D. DiBitonto,M. Diemoz,H.R. Dimitrov,C. Dionisi,Michael Dittmar,L. Djambazov,M. T. Dova,E. Drago,D. Duchesneau,P. Duinker,I. Durán,S. Easo,H. El Mamouni,A. Engler,F.J Eppling,F.C Erné,P. Extermann,R. Fabbretti,M. Fabre,S. Falciano,S.J. Fan,O. Fackler,J. Fay,M. Felcini,T. Ferguson,D. Fernandez,G. Fernandez,F. Ferroni,H. Fesefeldt,E. Fiandrini,Jh Field,Frank Filthaut,P. H. Fisher,G. Forconi,L. Fredj,K. Freudenreich,W. Friebel,M. Fukushima,M. Gailloud,Y Galaktionov,E. Gallo,S.N. Ganguli,P. Garcia-Abia,D. Gelé,Simonetta Gentile,N. Gheordanescu,Stefano Giagu,S. Goldfarb,Z.F Gong,E. Gonzalez,A Gougas,D. Goujon,G. Gratta,M. Gruenewald,C. Gu,M. Guanziroli,J.-K. Guo,Vk Gupta,Atul Gurtu,H. R. Gustafson,L. J. Gutay,K. Hangarter,B. Hartmann,A. Hasan,D. Hauschildt,C.F. He,J.T. He,T. Hebbeker,M. Hebert,A Hervé,K. Hilgers,H. Hofer,H.R. Hoorani,G. Hu,G Hu,B. Ille,M.M. Ilyas,V Innocente,H. Janssen,S. Jezequel,B.N. Jin,Lw Jones,I. Josa-Mutuberria,A. Kasser,Ra Khan,Yu. Kamyshkov,P. Kapinos,J.S. Kapustinsky,Y. Karyotakis,M. Kaur,S. Khokhar,M N. Kienzle Focacci,Jk Kim,Sc Kim,Yg Kim,W.W. Kinnison,A. Kirkby,D. Kirkby,Stefan Kirsch,W. Kittel,A Klimentov,R. Klöckner,Adriaan König,E. Koffeman,O. Kornadt,V Koutsenko,A. Koulbardis,R.W. Kraemer,T. Kramer,V.R. Krastev,W. Krenz,A. Krivshich,H. Kuijten,Krishna S. Kumar,A Kunin,G Landi,D. Lanske,S. Lanzano,A. Lebedev,P. Lebrun,P. Lecomte,P Lecoq,P. Le Coultre,D.M. Lee,J.S. Lee,K.Y. Lee,I. Leedom,C Leggett,J.M. Le Goff,R. Leiste,M. Lenti,Emilio Leonardi,C. Li,H. T. Li,P J Li,J. Y. Liao,Wt Lin,Z. Y. Lin,F.L. Linde,B. Lindemann,Yanlin Liu,W. Lohmann,Elson Longo,Y.S. Lu,J.M. Lubbers,K. Lübelsmeyer,Claudio Luci,D. Luckey,L. Ludovici,L. Luminari,Werner Lustermann,J.M. Ma,W.G Ma,M. Macdermott,R. Malik,A. Malinin,C. Maña,M. Maolinbay,P. Marchesini,F. Marion,A. Marin,J.P. Martin,L. Martinez-Laso,F. Marzano,G.G.G Massaro,K Mazumdar,P. Mcbride,T. McMahon,D. McNally,M. Merk,Leonardo Merola,M Meschini,W.J. Metzger,Y. Mi,A. Mihul,G.B. Mills,Y. Mir,G. Mirabelli,J. Mnich,M. Moller,B Monteleoni,R. Morand,S. Morganti,N.E. Moulai,R. Mount,S. Müller,A Nadtochy,E Nagy,Maddalena Napolitano,Francesca Nessi-Tedaldi,H. B. Newman,C. Neyer,M.A. Niaz,A. Nippe,H Nowak,G Organtini,D. Pandoulas,S. Paoletti,P. Paolucci,G. Pascale,G Passaleva,S. Patricelli,T. Paul,M. Pauluzzi,Christoph Paus,Felicitas Pauss,Yj Pei,S. Pensotti,D. Perret-Galliz,J. Perrier,A Pevsner,D. Piccolo,M. Pieri,P. A. Piroué,F. Plasil,V. Plyaskin,M. Pohl,V. Pojidaev,H Postema,Z.D. Qi,Jianming Qian,K.N. Qureshi,R. Raghavan,G. Rahal-Callot,Pg Rancoita,M. Rattaggi,G. Raven,P. Razis,Kenneth Francis Read,D. Ren,Z. L. Ren,M. Rescigno,S Reucroft,A. Ricker,S. Riemann,B.C. Riemers,K. Riles,O Rind,H.A. Rizvi,S. Ro,F. J. Rodriguez,Bp Roe,M. Rohner,L. Romero,S. Rosier-Lees,R. Rosmalen,Ph. Rosselet,W. van Rossum,Stefan Roth,A. Rubbia,J.A Rubio,Hans Rykaczewski,M. Sachwitz,J. Salico,J. M. Salicio,G.S. Sanders,A Santocchia,M. S. Sarakinos,G. Sartorelli,M. Sassowsky,G. Sauvage,V. A. Schegelsky,D. Schmitz,P. Schmitz,M. Schneegans,H. Schopper,Dj Schotanus,S. Shotkin,H.-J. Schreiber,J. Shukla,R. Schulte,S. Schulte,K. Schultze,J. Schwenke,G. Schwering,C. Sciacca,I. Scott,R. Sehgal,P. G. Seiler,J.C. Sens,L. Servoli,I. Sheer,D.Z. Shen,S. Shevchenko,X. R. Shi,E. Shumilov,V. Shoutko,D. Son,A. Sopczak,V. Soulimov,C. Spartiotis,T. Spickermann,P Spillantini,R. Starosta,M. Steuer,D P Stickland,F. Sticozzi,Howard A. Stone,K Strauch,B. C. Stringfellow,Katta Sudhakar,G. Sultanov,L.Z Sun,G.F. Susinno,H. Suter,Jd Swain,A.A. Syed,X.W. Tang,L Taylor,G. Terzi,Samuel C.C. Ting,S.M Ting,M. Tonutti,S. C. Tonwar,J Tóth,Andrei Tsaregorodtsev,Georgios Tsipolitis,Christopher Tully,K. L. Tung,J Ulbricht,L. Urbán,U. Uwer,E. Valente,R.T. Van de Walle,I. Vetlitsky,G. Viertel,P. Vikas,U. Vikas,M Vivargent,Helmut Vogel,H. Vogt,I. Vorobiev,A. A. Vorobyov,L. Vuilleumier,M. Wadhwa,W. Wallraff,C. Wang,C.R. Wang,X.L Wang,Y.F. Wang,Z.M Wang,C. Warner,A. Weber,Jens Weber,R. Weill,T. J. Wenaus,Jorg Wenninger,Martin White,C. Willmott,F Wittgenstein,D. Wright,Sx Wu,S. Wynhoff,B. Wysłouch,Y. Y. Xie,J. G. Xu,Z.Z Xu,Z. L. Xue,D. S. Yan,B.Z Yang,C.G. Yang,G. Yang,C.H. Ye,J.B Ye,Q. Ye,Sc Yeh,Z. W. Yin,J.M. You,N. Yunus,M. Yzerman,C. Zaccardelli,N. Zaitsev,P. Zemp,M. Zeng,Y. Zeng,D.H. Zhang,Z.P Zhang,B. Zhou,G.J. Zhou,J.F. Zhou,R. Y. Zhu,Antonino Zichichi,B.C.C. van der Zwaan

Search for lepton flavour violation in Z decays

1993

O Adriani
Manuel Aguilar-Benitez
S. Ahlen
J. Alcaraz
Alberto Aloisio
G. Alverson
M. G. Alviggi
Giovanni Ambrosi
Q. An
H. Anderhub
A. L. Anderson
V. P. Andreev
T. Angelescu
L. Antonov
D. Antreasyan
P. Arce
A. Arefiev
A Atamanchuk
T. Azemoon
T. Aziz
P.V.K.S. Baba
Paolo Bagnaia
J. A. Bakken
R. C. Ball
Swagato Banerjee
J. Bao
R Barillère
L. Barone
Andrea Baschirotto
R. Battiston
A. Bay
F. Becattini
J. Bechtluft
R. Becker
U Becker
F. Behner
J. Behrens
Gy L. Bencze
J. Berdugo
P Berges
B. Bertucci
Bl Betev
Maurizio Biasini
A. Biland
G. M. Bilei
R. Bizzarri
J.J. Blaising
G. J. Bobbink
R. Bock
A. Böhm
B. Borgia
M. Bosetti
D. Bourilkov
M. Bourquin
D. Boutigny
B. Bouwens
E. Brambilla
J. G. Branson
Ic Brock
M. Brooks
A. Bujak
J.D Burger
Wj Burger
J. Busenitz
A. Buytenhuijs
X.D. Cai
M Capell
M. Caria
G Carlino
Am Cartacci
Rinaldo Castello
Marcos Cerrada
F. Cesaroni
Y. H. Chang
Uk Chaturvedi
M. Chemarin
A. Chen
C. Chen
G. Chen
G. M. Chen
H.F. Chen
H. S. Chen
M. Y. Chen
W. Y. Chen
G. Chiefari
C.Y Chien
M. T. Choi
S. Chung
C Civinini
I Clare
R Clare
T.E. Coan
H.O. Cohn
G Coignet
N. Colino
A. Contin
F Cotorobai
X.T. Cui
X.Y. Cui
T.S Dai
R DAlessandro
R. de Asmundis
A Degré
K. Deiters
E. Dénes
Peter Denes
F. DeNotaristefani
M. Dhina
D. DiBitonto
M. Diemoz
H.R. Dimitrov
C. Dionisi
Michael Dittmar
L. Djambazov
M. T. Dova
E. Drago
D. Duchesneau
P. Duinker
I. Durán
S. Easo
H. El Mamouni
A. Engler
F.J Eppling
F.C Erné
P. Extermann
R. Fabbretti
M. Fabre
S. Falciano
S.J. Fan
O. Fackler
J. Fay
M. Felcini
T. Ferguson
D. Fernandez
G. Fernandez
F. Ferroni
H. Fesefeldt
E. Fiandrini
Jh Field
Frank Filthaut
P. H. Fisher
G. Forconi
L. Fredj
K. Freudenreich
W. Friebel
M. Fukushima
M. Gailloud
Y Galaktionov
E. Gallo
S.N. Ganguli
P. Garcia-Abia
D. Gelé
Simonetta Gentile
N. Gheordanescu
Stefano Giagu
S. Goldfarb
Z.F Gong
E. Gonzalez
A Gougas
D. Goujon
G. Gratta
M. Gruenewald
C. Gu
M. Guanziroli
J.-K. Guo
Vk Gupta
Atul Gurtu
H. R. Gustafson
L. J. Gutay
K. Hangarter
B. Hartmann
A. Hasan
D. Hauschildt
C.F. He
J.T. He
T. Hebbeker
M. Hebert
A Hervé
K. Hilgers
H. Hofer
H.R. Hoorani
G. Hu
G Hu
B. Ille
M.M. Ilyas
V Innocente
H. Janssen
S. Jezequel
B.N. Jin
Lw Jones
I. Josa-Mutuberria
A. Kasser
Ra Khan
Yu. Kamyshkov
P. Kapinos
J.S. Kapustinsky
Y. Karyotakis
M. Kaur
S. Khokhar
M N. Kienzle Focacci
Jk Kim
Sc Kim
Yg Kim
W.W. Kinnison
A. Kirkby
D. Kirkby
Stefan Kirsch
W. Kittel
A Klimentov
R. Klöckner
Adriaan König
E. Koffeman
O. Kornadt
V Koutsenko
A. Koulbardis
R.W. Kraemer
T. Kramer
V.R. Krastev
W. Krenz
A. Krivshich
H. Kuijten
Krishna S. Kumar
A Kunin
G Landi
D. Lanske
S. Lanzano
A. Lebedev
P. Lebrun
P. Lecomte
P Lecoq
P. Le Coultre
D.M. Lee
J.S. Lee
K.Y. Lee
I. Leedom
C Leggett
J.M. Le Goff
R. Leiste
M. Lenti
Emilio Leonardi
C. Li
H. T. Li
P J Li
J. Y. Liao
Wt Lin
Z. Y. Lin
F.L. Linde
B. Lindemann
Yanlin Liu
W. Lohmann
Elson Longo
Y.S. Lu
J.M. Lubbers
K. Lübelsmeyer
Claudio Luci
D. Luckey
L. Ludovici
L. Luminari
Werner Lustermann
J.M. Ma
W.G Ma
M. Macdermott
R. Malik
A. Malinin
C. Maña
M. Maolinbay
P. Marchesini
F. Marion
A. Marin
J.P. Martin
L. Martinez-Laso
F. Marzano
G.G.G Massaro
K Mazumdar
P. Mcbride
T. McMahon
D. McNally
M. Merk
Leonardo Merola
M Meschini
W.J. Metzger
Y. Mi
A. Mihul
G.B. Mills
Y. Mir
G. Mirabelli
J. Mnich
M. Moller
B Monteleoni
R. Morand
S. Morganti
N.E. Moulai
R. Mount
S. Müller
A Nadtochy
E Nagy
Maddalena Napolitano
Francesca Nessi-Tedaldi
H. B. Newman
C. Neyer
M.A. Niaz
A. Nippe
H Nowak
G Organtini
D. Pandoulas
S. Paoletti
P. Paolucci
G. Pascale
G Passaleva
S. Patricelli
T. Paul
M. Pauluzzi
Christoph Paus
Felicitas Pauss
Yj Pei
S. Pensotti
D. Perret-Galliz
J. Perrier
A Pevsner
D. Piccolo
M. Pieri
P. A. Piroué
F. Plasil
V. Plyaskin
M. Pohl
V. Pojidaev
H Postema
Z.D. Qi
Jianming Qian
K.N. Qureshi
R. Raghavan
G. Rahal-Callot
Pg Rancoita
M. Rattaggi
G. Raven
P. Razis
Kenneth Francis Read
D. Ren
Z. L. Ren
M. Rescigno
S Reucroft
A. Ricker
S. Riemann
B.C. Riemers
K. Riles
O Rind
H.A. Rizvi
S. Ro
F. J. Rodriguez
Bp Roe
M. Rohner
L. Romero
S. Rosier-Lees
R. Rosmalen
Ph. Rosselet
W. van Rossum
Stefan Roth
A. Rubbia
J.A Rubio
Hans Rykaczewski
M. Sachwitz
J. Salico
J. M. Salicio
G.S. Sanders
A Santocchia
M. S. Sarakinos
G. Sartorelli
M. Sassowsky
G. Sauvage
V. A. Schegelsky
D. Schmitz
P. Schmitz
M. Schneegans
H. Schopper
Dj Schotanus
S. Shotkin
H.-J. Schreiber
J. Shukla
R. Schulte
S. Schulte
K. Schultze
J. Schwenke
G. Schwering
C. Sciacca
I. Scott
R. Sehgal
P. G. Seiler
J.C. Sens
L. Servoli
I. Sheer
D.Z. Shen
S. Shevchenko
X. R. Shi
E. Shumilov
V. Shoutko
D. Son
A. Sopczak
V. Soulimov
C. Spartiotis
T. Spickermann
P Spillantini
R. Starosta
M. Steuer
D P Stickland
F. Sticozzi
Howard A. Stone
K Strauch
B. C. Stringfellow
Katta Sudhakar
G. Sultanov
L.Z Sun
G.F. Susinno
H. Suter
Jd Swain
A.A. Syed
X.W. Tang
L Taylor
G. Terzi
Samuel C.C. Ting
S.M Ting
M. Tonutti
S. C. Tonwar
J Tóth
Andrei Tsaregorodtsev
Georgios Tsipolitis
Christopher Tully
K. L. Tung
J Ulbricht
L. Urbán
U. Uwer
E. Valente
R.T. Van de Walle
I. Vetlitsky
G. Viertel
P. Vikas
U. Vikas
M Vivargent
Helmut Vogel
H. Vogt
I. Vorobiev
A. A. Vorobyov
L. Vuilleumier
M. Wadhwa
W. Wallraff
C. Wang
C.R. Wang
X.L Wang
Y.F. Wang
Z.M Wang
C. Warner
A. Weber
Jens Weber
R. Weill
T. J. Wenaus
Jorg Wenninger
Martin White
C. Willmott
F Wittgenstein
D. Wright
Sx Wu
S. Wynhoff
B. Wysłouch
Y. Y. Xie
J. G. Xu
Z.Z Xu
Z. L. Xue
D. S. Yan
B.Z Yang
C.G. Yang
G. Yang
C.H. Ye
J.B Ye
Q. Ye
Sc Yeh
Z. W. Yin
J.M. You
N. Yunus
M. Yzerman
C. Zaccardelli
N. Zaitsev
P. Zemp
M. Zeng
Y. Zeng
D.H. Zhang
Z.P Zhang
B. Zhou
G.J. Zhou
J.F. Zhou
R. Y. Zhu
Antonino Zichichi
B.C.C. van der Zwaan

Abstract We have searched for lepton flavour violation in Z 0 boson decays into lepton pairs, Z 0 →μτ, Z 0 →eτ, and Z 0 →eμ. The data sample is based on an integrated luminosity of 10.4 pb -1 corresponding to 370 000 Z 0 's produced. We obtain upper limits on the branching ratios of 4.8×10 -5 for the μτ, 3.4×10 -5 for the eτ and 2.4×10 -5 for the eμ decay modes at the 95% confidence level.

Keywords:

Quantum electrodynamics
Flavour
Nuclear physics
W and Z bosons
Particle physics
Lepton
Elementary particle
Branching fraction
Bhabha scattering
Electron–positron annihilation
Boson
Physics
Monte Carlo method

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