A study of electron-muon pair production in 450 GeV/c pBe collisions

T Akesson,S. Almehed,A.L.S. Angelis,J. Antos,H. Atherton,P. Aubry,H. W. Bartels,G. Beaudoin,J. M. Beaulieu,H. Beker,O. Benary,D. Bettoni,V. Bisi,I. Blevis,H. Boggild,W. Cleland,M. Clemen,B. Collick,F. Corriveau,S. Dagan,K. Dederichs,P. Depommier,N. DiGiacomo,S. DiLiberto,J. R. Dodd,B. Dolgoshein,A. Drees,S. Eidelman,H. En’yo,B. Erlandsson,M.J. Esten,C. Fabjan,P. Fischer,A. Gaidot,F. Gibrat-Debu,P. Giubellino,P. Glässel,U. Goerlach,Y. Golubkov,R. Haglund,L. A. Hamel,H. W. van Hecke,V. Hedberg,R. Heifetz,A. Hölscher,B. V. Jacak,G. Jarlskog,S. Johannson,H. Kraner,V. Kroh,F. Lamarche,C. Leroy,D. Lissauer,G. London,B. Lörstad,A. Lounis,F. Martelli,A. Marzari Chiesa,Massimo Masera,M. A. Mazzoni,E. Mazzucato,M.L. McCubbin,N. A. McCubbin,P. L. McGaughey,F. Meddi,U. Mjörnmark,M.T. Muciaccia,S. Muraviev,M. Murray,M Neubert,P Nevski,S. Nilsson,L. Olsen,Y. Oren,J. P. Pansart,Y. M. Park,A. Pfeiffer,F. Piuz,V. Polychronakos,P. Pomianowski,G. Poulard,M. J. Price,D. Rahm,Luciano Ramello,L. Riccati,G. Romano,G. Rosa,L. Sandor,J. Schukraft,M. Sekimoto,M. Seman,A. Shikonian,A. Shmeleva,V. Sidorov,S. Simone,Y. Sirois,H. Sletten,Sergei Smirnov,W. E. Sondheim,H.J. Specht,E. Stern,I. Stumer,A. Sumarokov,J. W. Sunier,V. Tcherniatin,J. Thompson,V. Tikhomirov,C.M Valine,A Vanyashin,G. Vasseur,R. Veenhof,R. Wigmans,W. J. Willis,P. Yepes

A study of electron-muon pair production in 450 GeV/c pBe collisions

1996

T Akesson
S. Almehed
A.L.S. Angelis
J. Antos
H. Atherton
P. Aubry
H. W. Bartels
G. Beaudoin
J. M. Beaulieu
H. Beker
O. Benary
D. Bettoni
V. Bisi
I. Blevis
H. Boggild
W. Cleland
M. Clemen
B. Collick
F. Corriveau
S. Dagan
K. Dederichs
P. Depommier
N. DiGiacomo
S. DiLiberto
J. R. Dodd
B. Dolgoshein
A. Drees
S. Eidelman
H. En’yo
B. Erlandsson
M.J. Esten
C. Fabjan
P. Fischer
A. Gaidot
F. Gibrat-Debu
P. Giubellino
P. Glässel
U. Goerlach
Y. Golubkov
R. Haglund
L. A. Hamel
H. W. van Hecke
V. Hedberg
R. Heifetz
A. Hölscher
B. V. Jacak
G. Jarlskog
S. Johannson
H. Kraner
V. Kroh
F. Lamarche
C. Leroy
D. Lissauer
G. London
B. Lörstad
A. Lounis
F. Martelli
A. Marzari Chiesa
Massimo Masera
M. A. Mazzoni
E. Mazzucato
M.L. McCubbin
N. A. McCubbin
P. L. McGaughey
F. Meddi
U. Mjörnmark
M.T. Muciaccia
S. Muraviev
M. Murray
M Neubert
P Nevski
S. Nilsson
L. Olsen
Y. Oren
J. P. Pansart
Y. M. Park
A. Pfeiffer
F. Piuz
V. Polychronakos
P. Pomianowski
G. Poulard
M. J. Price
D. Rahm
Luciano Ramello
L. Riccati
G. Romano
G. Rosa
L. Sandor
J. Schukraft
M. Sekimoto
M. Seman
A. Shikonian
A. Shmeleva
V. Sidorov
S. Simone
Y. Sirois
H. Sletten
Sergei Smirnov
W. E. Sondheim
H.J. Specht
E. Stern
I. Stumer
A. Sumarokov
J. W. Sunier
V. Tcherniatin
J. Thompson
V. Tikhomirov
C.M Valine
A Vanyashin
G. Vasseur
R. Veenhof
R. Wigmans
W. J. Willis
P. Yepes

We report on the production ofe± μ∓ pairs in 450 GeV/c pBe collisions at the CERN SPS. Theeμ signal, which has average missing energy of 21 GeV, is shown to be consistent with expectations from charm decay, and implies a σ ×B for\(c\bar c\) production in p-nucleon collisions of 0.63 ± 0.35μb. Alternatively, using an estimate of charm production from other experiments, the data imply a 95% confidence level upper limit of 1.16μb on any new physics process which producese±μ∓.

Keywords:

Muon
Physics
Large Hadron Collider
Pair production
Particle physics
Transition radiation detector
Nuclear physics
Electron
Physics beyond the Standard Model
Missing energy
Beryllium
Quantum electrodynamics

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