Multi-electron production at high transverse momenta in $ep$ collisions at HERA
A. Aktas
,
V. Andreev
,
T. Anthonis
,
A. Asmone
,
A. Babaev
,
S. Backovic
,
J. Bahr
,
P. Baranov
,
E. Barrelet
(1)
,
W. Bartel
,
S. Baumgartner
,
J. Becker
,
M. Beckingham
,
O. Behnke
,
O. Behrendt
,
A. Belousov
,
C. Berger
,
T. Berndt
,
J.C. Bizot
(2)
,
J. Bohme
,
M.O. Boenig
,
V. Boudry
(3)
,
J. Bracinik
,
W. Braunschweig
,
V. Brisson
(2)
,
H.B. Broker
,
D.P. Brown
,
D. Bruncko
,
F.W. Busser
,
A. Bunyatyan
,
G. Buschhorn
,
L. Bystritskaya
,
A.J. Campbell
,
S. Caron
,
F. Cassol-Brunner
(4)
,
V. Chekelian
,
D. Clarke
,
C. Collard
,
J.G. Contreras
,
Y.R. Coppens
,
J.A. Coughlan
,
M.C. Cousinou
(4)
,
B.E. Cox
,
G. Cozzika
,
J. Cvach
,
J.B. Dainton
,
W.D. Dau
,
K. Daum
,
B. Delcourt
(2)
,
N. Delerue
(4)
,
R. Demirchyan
,
A. de Roeck
,
E.A. de Wolf
,
C. Diaconu
(4)
,
J. Dingfelder
,
V. Dodonov
,
J.D. Dowell
,
A. Dubak
,
C. Duprel
,
G. Eckerlin
,
V. Efremenko
,
S. Egli
,
R. Eichler
,
F. Eisele
,
M. Ellerbrock
,
E. Elsen
,
M. Erdmann
,
W. Erdmann
,
P.J.W. Faulkner
,
L. Favart
,
A. Fedotov
,
R. Felst
,
J. Ferencei
,
M. Fleischer
,
P. Fleischmann
,
Y.H. Fleming
,
G. Flucke
,
G. Flugge
,
A. Fomenko
,
I. Foresti
,
J. Formanek
,
G. Franke
,
G. Frising
,
E. Gabathuler
,
K. Gabathuler
,
J. Garvey
,
J. Gassner
,
J. Gayler
,
R. Gerhards
,
C. Gerlich
,
S. Ghazaryan
,
L. Goerlich
,
N. Gogitidze
,
S. Gorbounov
,
C. Grab
,
V. Grabski
,
H. Grassler
,
T. Greenshaw
,
M. Gregori
,
G. Grindhammer
,
D. Haidt
,
L. Hajduk
,
J. Haller
,
G. Heinzelmann
,
R.C.W. Henderson
,
H. Henschel
,
O. Henshaw
,
R. Heremans
,
G. Herrera
,
I. Herynek
,
M. Hildebrandt
,
K.H. Hiller
,
J. Hladky
,
P. Hoting
,
D. Hoffmann
(4)
,
R. Horisberger
,
A. Hovhannisyan
,
M. Ibbotson
,
M. Jacquet
(2)
,
L. Janauschek
,
X. Janssen
,
V. Jemanov
,
L. Jonsson
,
C. A. Johnson
,
D.P. Johnson
,
H. Jung
,
D. Kant
,
M. Kapichine
,
M. Karlsson
,
J. Katzy
,
F. Keil
,
N. Keller
,
J. Kennedy
,
I.R. Kenyon
,
C. Kiesling
,
M. Klein
,
C. Kleinwort
,
T. Kluge
,
G. Knies
,
B. Koblitz
,
S.D. Kolya
,
V. Korbel
,
P. Kostka
,
R. Koutouev
,
A. Kropivnitskaya
,
J. Kroseberg
,
J. Kueckens
,
T. Kuhr
,
M.P.J. Landon
,
W. Lange
,
T. Lastovicka
,
P. Laycock
,
A. A. Lebedev
,
B. Leiner
,
R. Lemrani
,
V. Lendermann
,
S. Levonian
,
B. List
,
E. Lobodzinska
,
N. Loktionova
,
R. Lopez-Fernandez
,
V. Lubimov
,
H. Lueders
,
S. Luders
,
D. Luke
,
L. Lytkin
,
A. Makankine
,
N. Malden
,
E. Malinovski
,
S. Mangano
,
P. Marage
,
J. Marks
,
R. Marshall
,
H.U. Martyn
,
J. Martyniak
,
S.J. Maxeld
,
D. Meer
,
A. Mehta
,
K. Meier
,
A.B. Meyer
,
H. Meyer
,
J. Meyer
,
S. Michine
,
S. Mikocki
,
D. Milstead
,
F. Moreau
(3)
,
A. Morozov
,
J.V. Morris
,
K. Muller
,
P. Murn
,
V. Nagovizin
,
B. Naroska
,
J. Naumann
,
T. Naumann
,
P.R. Newman
,
F. Niebergall
,
C. Niebuhr
,
D. Nikitin
,
G. Nowak
,
M. Nozicka
,
B. Olivier
,
J.E. Olsson
,
D. Ozerov
,
C. Pascaud
(2)
,
G.D. Patel
,
M. Peez
(4)
,
Emile Perez
,
A. Petrukhin
,
D. Pitzl
,
R. Poschl
,
B. Povh
,
N. Raicevic
,
J. Rauschenberger
,
P. Reimer
,
B. Reisert
,
C. Risler
,
E. Rizvi
,
P. Robmann
,
R. Roosen
,
A. Rostovtsev
,
S. Rusakov
,
K. Rybicki
,
D.P.C. Sankey
,
E. Sauvan
(4)
,
S. Schatzel
,
J. Scheins
,
F.P. Schilling
,
P. Schleper
,
D. Schmidt
,
S. Schmidt
,
S. Schmitt
,
M. Schneider
(4)
,
L. Schoeffel
,
A. Schoning
,
V. Schroder
,
H.C. Schultz-Coulon
,
C. Schwanenberger
,
K. Sedlak
,
F. Sefkow
,
I. Sheviakov
,
L.N. Shtarkov
,
Y. Sirois
(3)
,
T. Sloan
,
P. Smirnov
,
Y. Soloviev
,
D. South
,
V. Spaskov
,
A. Specka
(3)
,
H. Spitzer
,
R. Stamen
,
B. Stella
,
J. Stiewe
,
I. Strauch
,
U. Straumann
,
G. Thompson
,
P.D. Thompson
,
F. Tomasz
,
D. Traynor
,
P. Truol
,
G. Tsipolitis
,
I. Tsurin
,
J. Turnau
,
J.E. Turney
,
E. Tzamariudaki
,
A. Uraev
,
Martin Urban
,
A. Usik
,
S. Valkar
,
A. Valkarova
,
C. Vallee
(4)
,
P. van Mechelen
,
A. Vargas Trevino
,
S. Vassiliev
,
Y. Vazdik
,
C. Veelken
,
A. Vest
,
A. Vichnevski
,
V. Volchinski
,
K. Wacker
,
J. Wagner
,
B. Waugh
,
G. Weber
,
R. Weber
,
D. Wegener
,
C. Werner
,
N. Werner
,
M. Wessels
,
B. Wessling
,
M. Winde
,
G.G. Winter
,
C. Wissing
,
E.E. Woehrling
,
E. Wunsch
,
J. Zacek
,
J. Zalesak
,
Zhiqing Zhang
(2)
,
A. Zhokin
,
F. Zomer
(2)
,
M. Zur Nedden
A. Aktas
- Function : Author
V. Andreev
- Function : Author
T. Anthonis
- Function : Author
A. Asmone
- Function : Author
A. Babaev
- Function : Author
S. Backovic
- Function : Author
J. Bahr
- Function : Author
P. Baranov
- Function : Author
W. Bartel
- Function : Author
S. Baumgartner
- Function : Author
J. Becker
- Function : Author
M. Beckingham
- Function : Author
O. Behnke
- Function : Author
O. Behrendt
- Function : Author
A. Belousov
- Function : Author
C. Berger
- Function : Author
T. Berndt
- Function : Author
J. Bohme
- Function : Author
M.O. Boenig
- Function : Author
V. Boudry
- Function : Author
- PersonId : 180590
- IdHAL : vincent-boudry
- ORCID : 0000-0002-1258-1338
- IdRef : 188426426
J. Bracinik
- Function : Author
W. Braunschweig
- Function : Author
H.B. Broker
- Function : Author
D.P. Brown
- Function : Author
D. Bruncko
- Function : Author
F.W. Busser
- Function : Author
A. Bunyatyan
- Function : Author
G. Buschhorn
- Function : Author
L. Bystritskaya
- Function : Author
A.J. Campbell
- Function : Author
S. Caron
- Function : Author
V. Chekelian
- Function : Author
D. Clarke
- Function : Author
C. Collard
- Function : Author
- PersonId : 753602
- IdHAL : caroline-collard
- ORCID : 0000-0002-5230-8387
- IdRef : 223465992
J.G. Contreras
- Function : Author
Y.R. Coppens
- Function : Author
J.A. Coughlan
- Function : Author
B.E. Cox
- Function : Author
G. Cozzika
- Function : Author
J. Cvach
- Function : Author
J.B. Dainton
- Function : Author
W.D. Dau
- Function : Author
K. Daum
- Function : Author
N. Delerue
- Function : Author
- PersonId : 742379
- IdHAL : nicolas-delerue
- ORCID : 0000-0002-1367-9900
- IdRef : 06782224X
R. Demirchyan
- Function : Author
A. de Roeck
- Function : Author
E.A. de Wolf
- Function : Author
J. Dingfelder
- Function : Author
V. Dodonov
- Function : Author
J.D. Dowell
- Function : Author
A. Dubak
- Function : Author
C. Duprel
- Function : Author
G. Eckerlin
- Function : Author
V. Efremenko
- Function : Author
S. Egli
- Function : Author
R. Eichler
- Function : Author
F. Eisele
- Function : Author
M. Ellerbrock
- Function : Author
E. Elsen
- Function : Author
M. Erdmann
- Function : Author
W. Erdmann
- Function : Author
P.J.W. Faulkner
- Function : Author
L. Favart
- Function : Author
A. Fedotov
- Function : Author
R. Felst
- Function : Author
J. Ferencei
- Function : Author
M. Fleischer
- Function : Author
P. Fleischmann
- Function : Author
Y.H. Fleming
- Function : Author
G. Flucke
- Function : Author
G. Flugge
- Function : Author
A. Fomenko
- Function : Author
I. Foresti
- Function : Author
J. Formanek
- Function : Author
G. Franke
- Function : Author
G. Frising
- Function : Author
E. Gabathuler
- Function : Author
K. Gabathuler
- Function : Author
J. Garvey
- Function : Author
J. Gassner
- Function : Author
J. Gayler
- Function : Author
R. Gerhards
- Function : Author
C. Gerlich
- Function : Author
S. Ghazaryan
- Function : Author
L. Goerlich
- Function : Author
N. Gogitidze
- Function : Author
S. Gorbounov
- Function : Author
C. Grab
- Function : Author
V. Grabski
- Function : Author
H. Grassler
- Function : Author
T. Greenshaw
- Function : Author
M. Gregori
- Function : Author
G. Grindhammer
- Function : Author
D. Haidt
- Function : Author
L. Hajduk
- Function : Author
J. Haller
- Function : Author
G. Heinzelmann
- Function : Author
R.C.W. Henderson
- Function : Author
H. Henschel
- Function : Author
O. Henshaw
- Function : Author
R. Heremans
- Function : Author
G. Herrera
- Function : Author
I. Herynek
- Function : Author
M. Hildebrandt
- Function : Author
K.H. Hiller
- Function : Author
J. Hladky
- Function : Author
P. Hoting
- Function : Author
R. Horisberger
- Function : Author
A. Hovhannisyan
- Function : Author
M. Ibbotson
- Function : Author
L. Janauschek
- Function : Author
X. Janssen
- Function : Author
V. Jemanov
- Function : Author
L. Jonsson
- Function : Author
C. A. Johnson
- Function : Author
D.P. Johnson
- Function : Author
H. Jung
- Function : Author
D. Kant
- Function : Author
M. Kapichine
- Function : Author
M. Karlsson
- Function : Author
- PersonId : 755204
- ORCID : 0000-0002-2011-0851
J. Katzy
- Function : Author
F. Keil
- Function : Author
N. Keller
- Function : Author
J. Kennedy
- Function : Author
I.R. Kenyon
- Function : Author
C. Kiesling
- Function : Author
M. Klein
- Function : Author
C. Kleinwort
- Function : Author
T. Kluge
- Function : Author
G. Knies
- Function : Author
B. Koblitz
- Function : Author
S.D. Kolya
- Function : Author
V. Korbel
- Function : Author
P. Kostka
- Function : Author
R. Koutouev
- Function : Author
A. Kropivnitskaya
- Function : Author
J. Kroseberg
- Function : Author
J. Kueckens
- Function : Author
T. Kuhr
- Function : Author
M.P.J. Landon
- Function : Author
W. Lange
- Function : Author
T. Lastovicka
- Function : Author
P. Laycock
- Function : Author
A. A. Lebedev
- Function : Author
B. Leiner
- Function : Author
R. Lemrani
- Function : Author
V. Lendermann
- Function : Author
S. Levonian
- Function : Author
B. List
- Function : Author
E. Lobodzinska
- Function : Author
N. Loktionova
- Function : Author
R. Lopez-Fernandez
- Function : Author
V. Lubimov
- Function : Author
H. Lueders
- Function : Author
S. Luders
- Function : Author
D. Luke
- Function : Author
L. Lytkin
- Function : Author
A. Makankine
- Function : Author
N. Malden
- Function : Author
E. Malinovski
- Function : Author
S. Mangano
- Function : Author
P. Marage
- Function : Author
J. Marks
- Function : Author
R. Marshall
- Function : Author
H.U. Martyn
- Function : Author
J. Martyniak
- Function : Author
S.J. Maxeld
- Function : Author
D. Meer
- Function : Author
A. Mehta
- Function : Author
K. Meier
- Function : Author
A.B. Meyer
- Function : Author
H. Meyer
- Function : Author
J. Meyer
- Function : Author
S. Michine
- Function : Author
S. Mikocki
- Function : Author
D. Milstead
- Function : Author
A. Morozov
- Function : Author
J.V. Morris
- Function : Author
K. Muller
- Function : Author
P. Murn
- Function : Author
V. Nagovizin
- Function : Author
B. Naroska
- Function : Author
J. Naumann
- Function : Author
T. Naumann
- Function : Author
P.R. Newman
- Function : Author
F. Niebergall
- Function : Author
C. Niebuhr
- Function : Author
D. Nikitin
- Function : Author
G. Nowak
- Function : Author
- PersonId : 755165
- ORCID : 0000-0002-7031-7754
M. Nozicka
- Function : Author
B. Olivier
- Function : Author
J.E. Olsson
- Function : Author
D. Ozerov
- Function : Author
G.D. Patel
- Function : Author
Emile Perez
- Function : Author
A. Petrukhin
- Function : Author
D. Pitzl
- Function : Author
R. Poschl
- Function : Author
- PersonId : 741081
- IdHAL : roman-poschl
- ORCID : 0000-0001-8164-5625
B. Povh
- Function : Author
N. Raicevic
- Function : Author
J. Rauschenberger
- Function : Author
P. Reimer
- Function : Author
- PersonId : 755166
- ORCID : 0000-0001-9238-2146
B. Reisert
- Function : Author
C. Risler
- Function : Author
E. Rizvi
- Function : Author
P. Robmann
- Function : Author
R. Roosen
- Function : Author
A. Rostovtsev
- Function : Author
S. Rusakov
- Function : Author
K. Rybicki
- Function : Author
D.P.C. Sankey
- Function : Author
S. Schatzel
- Function : Author
J. Scheins
- Function : Author
F.P. Schilling
- Function : Author
P. Schleper
- Function : Author
D. Schmidt
- Function : Author
S. Schmidt
- Function : Author
S. Schmitt
- Function : Author
- PersonId : 801962
- ORCID : 0000-0001-7759-7106
L. Schoeffel
- Function : Author
A. Schoning
- Function : Author
V. Schroder
- Function : Author
H.C. Schultz-Coulon
- Function : Author
C. Schwanenberger
- Function : Author
K. Sedlak
- Function : Author
F. Sefkow
- Function : Author
I. Sheviakov
- Function : Author
L.N. Shtarkov
- Function : Author
T. Sloan
- Function : Author
P. Smirnov
- Function : Author
Y. Soloviev
- Function : Author
D. South
- Function : Author
V. Spaskov
- Function : Author
H. Spitzer
- Function : Author
R. Stamen
- Function : Author
B. Stella
- Function : Author
J. Stiewe
- Function : Author
I. Strauch
- Function : Author
U. Straumann
- Function : Author
G. Thompson
- Function : Author
P.D. Thompson
- Function : Author
F. Tomasz
- Function : Author
D. Traynor
- Function : Author
P. Truol
- Function : Author
G. Tsipolitis
- Function : Author
I. Tsurin
- Function : Author
J. Turnau
- Function : Author
J.E. Turney
- Function : Author
E. Tzamariudaki
- Function : Author
A. Uraev
- Function : Author
Martin Urban
- Function : Author
A. Usik
- Function : Author
S. Valkar
- Function : Author
A. Valkarova
- Function : Author
P. van Mechelen
- Function : Author
A. Vargas Trevino
- Function : Author
S. Vassiliev
- Function : Author
Y. Vazdik
- Function : Author
C. Veelken
- Function : Author
A. Vest
- Function : Author
A. Vichnevski
- Function : Author
V. Volchinski
- Function : Author
K. Wacker
- Function : Author
J. Wagner
- Function : Author
B. Waugh
- Function : Author
G. Weber
- Function : Author
R. Weber
- Function : Author
D. Wegener
- Function : Author
C. Werner
- Function : Author
N. Werner
- Function : Author
M. Wessels
- Function : Author
B. Wessling
- Function : Author
M. Winde
- Function : Author
G.G. Winter
- Function : Author
C. Wissing
- Function : Author
E.E. Woehrling
- Function : Author
E. Wunsch
- Function : Author
J. Zacek
- Function : Author
J. Zalesak
- Function : Author
A. Zhokin
- Function : Author
M. Zur Nedden
- Function : Author
Abstract
Multi-electron production is studied at high electron transverse momentum in positron- and electron-proton collisions using the H1 detector at HERA. The data correspond to an integrated luminosity of 115 pb-1. Di-electron and tri-electron event yields are measured. Cross sections are derived in a restricted phase space region dominated by photon-photon collisions. In general good agreement is found with the Standard Model predictions. However, for electron pair invariant masses above 100 GeV, three di-electron events and three tri-electron events are observed, compared to Standard Model expectations of 0.30 \pm 0.04 and 0.23 \pm 0.04, respectively.
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