Searching a Dark Photon with HADES
G. Agakishiev
,
A. Balanda
,
D. Belver
,
A. Belyaev
,
J. C. Berger-Chen
,
A. Blanco
,
M. Boehmer
,
J. L. Boyard
(1)
,
P. Cabanelas
,
S. Chernenko
,
A. Dybczak
,
E. Epple
,
L. Fabbbietti
,
O. Fateev
,
P. Finocchiaro
,
P. Fonte
,
J. Friese
,
I. Froehlich
,
T. Galatyuk
,
J. A. Garzon
,
R. Gernhaeuser
,
K. Goebel
,
M. Golubeva
,
D. Gonzalez-Diaz
,
F. Guber
,
M. Gumberidze
,
T. Heinz
,
T. Hennino
(1)
,
R. Holzmann
,
A. Ierusalimov
,
I. Iori
,
A. Ivashkin
,
M. Jurkovic
,
B. Kaempfer
,
T. Karavicheva
,
I. Koenig
,
W. Koenig
,
B. W. Kolb
,
G. Kornakov
,
R. Kotte
,
A. Krasa
,
F. Krizek
,
R. Kruecken
,
H. Kuc
(1)
,
W. Kuehn
,
A. Kugler
,
A. Kurepin
,
V. Ladygin
,
R. Lalik
,
S. Lang
,
K. Lapidus
,
A. Lebedev
,
T. Liu
,
L. Lopes
,
M. Lorenz
,
L. Maier
,
A. Mangiarotti
,
J. Markert
,
V. Metag
,
B. Michalska
,
J. Michel
,
C. Muentz
,
L. Naumann
,
Y. C. Pachmayer
,
M. Palka
,
Y. Parpottas
,
V. Pechenov
,
O. Pechenova
,
V. Petousis
,
J. Pietraszko
,
W. Przygoda
,
B. Ramstein
(1)
,
A. Reshetin
,
A. Rustamov
,
A. Sadovsky
,
P. Salabura
,
T. Scheib
,
H. Schuldes
,
A. Schmah
,
E. Schwab
,
J. Siebenson
,
Yu. G. Sobolev
,
S. Spataro
,
B. Spruck
,
H. Stroebele
,
J. Stroth
,
C. Sturm
,
A. Tarantola
,
K. Teilab
,
P. Tlusty
,
M. Traxler
,
R. Trebacz
,
H. Tsertos
,
T. Vasiliev
,
V. Wagner
,
M. Weber
,
C. Wendisch
,
J. Wuestenfeld
,
S. Yurevich
,
Y. Zanevsky
G. Agakishiev
- Function : Author
A. Balanda
- Function : Author
D. Belver
- Function : Author
A. Belyaev
- Function : Author
J. C. Berger-Chen
- Function : Author
A. Blanco
- Function : Author
M. Boehmer
- Function : Author
P. Cabanelas
- Function : Author
S. Chernenko
- Function : Author
A. Dybczak
- Function : Author
E. Epple
- Function : Author
L. Fabbbietti
- Function : Author
O. Fateev
- Function : Author
P. Finocchiaro
- Function : Author
P. Fonte
- Function : Author
J. Friese
- Function : Author
I. Froehlich
- Function : Author
T. Galatyuk
- Function : Author
J. A. Garzon
- Function : Author
R. Gernhaeuser
- Function : Author
K. Goebel
- Function : Author
M. Golubeva
- Function : Author
D. Gonzalez-Diaz
- Function : Author
F. Guber
- Function : Author
M. Gumberidze
- Function : Author
T. Heinz
- Function : Author
- PersonId : 761809
- ORCID : 0000-0003-1365-9464
- IdRef : 242263097
R. Holzmann
- Function : Author
A. Ierusalimov
- Function : Author
I. Iori
- Function : Author
A. Ivashkin
- Function : Author
M. Jurkovic
- Function : Author
B. Kaempfer
- Function : Author
T. Karavicheva
- Function : Author
I. Koenig
- Function : Author
W. Koenig
- Function : Author
B. W. Kolb
- Function : Author
G. Kornakov
- Function : Author
R. Kotte
- Function : Author
A. Krasa
- Function : Author
F. Krizek
- Function : Author
R. Kruecken
- Function : Author
W. Kuehn
- Function : Author
A. Kugler
- Function : Author
A. Kurepin
- Function : Author
V. Ladygin
- Function : Author
R. Lalik
- Function : Author
S. Lang
- Function : Author
K. Lapidus
- Function : Author
A. Lebedev
- Function : Author
T. Liu
- Function : Author
L. Lopes
- Function : Author
M. Lorenz
- Function : Author
L. Maier
- Function : Author
A. Mangiarotti
- Function : Author
J. Markert
- Function : Author
V. Metag
- Function : Author
B. Michalska
- Function : Author
J. Michel
- Function : Author
C. Muentz
- Function : Author
L. Naumann
- Function : Author
Y. C. Pachmayer
- Function : Author
M. Palka
- Function : Author
Y. Parpottas
- Function : Author
V. Pechenov
- Function : Author
O. Pechenova
- Function : Author
V. Petousis
- Function : Author
J. Pietraszko
- Function : Author
W. Przygoda
- Function : Author
A. Reshetin
- Function : Author
A. Rustamov
- Function : Author
A. Sadovsky
- Function : Author
P. Salabura
- Function : Author
T. Scheib
- Function : Author
H. Schuldes
- Function : Author
A. Schmah
- Function : Author
E. Schwab
- Function : Author
J. Siebenson
- Function : Author
Yu. G. Sobolev
- Function : Author
S. Spataro
- Function : Author
B. Spruck
- Function : Author
H. Stroebele
- Function : Author
J. Stroth
- Function : Author
C. Sturm
- Function : Author
A. Tarantola
- Function : Author
K. Teilab
- Function : Author
P. Tlusty
- Function : Author
M. Traxler
- Function : Author
R. Trebacz
- Function : Author
H. Tsertos
- Function : Author
T. Vasiliev
- Function : Author
V. Wagner
- Function : Author
M. Weber
- Function : Author
C. Wendisch
- Function : Author
J. Wuestenfeld
- Function : Author
S. Yurevich
- Function : Author
Y. Zanevsky
- Function : Author
Abstract
We present a search for the e+e- decay of a hypothetical dark photon, also names U vector boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) + KCl reaction. An upper limit on the kinetic mixing parameter squared epsilon^{2} at 90% CL has been obtained for the mass range M(U) = 0.02 - 0.55 GeV/c2 and is compared with the present world data set. For masses 0.03 - 0.1 GeV/c^2, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favoured by the muon g-2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 * 10^{-6} has been set on the helicity-suppressed direct decay of the eta meson, eta-> e+e-, at 90% CL.