Direct photon production in d+Au collisions at √sNN=200 GeV
A. Adare
,
Laurent Aphecetche
(1)
,
E. T. Atomssa
(2)
,
A. Baldisseri
(3)
,
H. Borel
(3)
,
Xavier Camard
(1)
,
J. -L. Charvet
(3)
,
Y. Cobigo
(3)
,
M. P. Comets
(4)
,
Zaida Conesa del Valle
(2)
,
Jean-Pierre Cussonneau
(1)
,
T. Dahms
(2)
,
Hugues Delagrange
(1)
,
D. D’enterria
(2)
,
O. Drapier
(2)
,
B. Espagnon
(4)
,
C. Finck
(1)
,
F. Fleuret
(2)
,
S. Gadrat
(5)
,
M. Germain
(1)
,
M. Gonin
(2)
,
J. Gosset
(3)
,
R. Granier de Cassagnac
(2)
,
Ahmed Hadj Henni
(1)
,
D. Jouan
(4)
,
G.-B. Kim
,
Y. Le Bornec
(4)
,
Gines Martinez Garcia
(1)
,
H. Pereira
(3)
,
A. Rakotozafindrabe
(2)
,
G. Roche
(5)
,
A. Romana
(2)
,
P. Rosnet
(5)
,
Y. Schutz
(1)
,
F. Staley
(3)
,
C. Suire
(4)
,
V-N. Tram
(2)
,
N. Willis
(4)
A. Adare
- Function : Author
Laurent Aphecetche
- Function : Author
- PersonId : 2010
- IdHAL : laurent-aphecetche
- ORCID : 0000-0001-7662-3878
- IdRef : 113847653
Zaida Conesa del Valle
- Function : Author
- PersonId : 738528
- IdHAL : zaida-conesa-del-valle
- ORCID : 0000-0002-7602-2930
Jean-Pierre Cussonneau
- Function : Author
- PersonId : 15492
- IdHAL : jean-pierre-cussonneau
- ORCID : 0000-0001-5061-4973
- IdRef : 122521285
C. Finck
- Function : Author
- PersonId : 1314557
- IdHAL : christian-finck
- ORCID : 0000-0002-5068-5453
R. Granier de Cassagnac
- Function : Author
- PersonId : 739189
- IdHAL : raphgrandecass
- ORCID : 0000-0002-1275-7292
- IdRef : 132136651
G.-B. Kim
- Function : Author
Gines Martinez Garcia
- Function : Author
- PersonId : 169952
- IdHAL : gines-martinez
- ORCID : 0000-0002-8657-6742
- IdRef : 068952961
Abstract
Direct photons have been measured in psNN = 200 GeV d+Au collisions at midrapidity. A widepT range is covered by measurements of nearly-real virtual photons (1 < pT < 6 GeV/c) and realphotons (5 < pT < 16 GeV/c). The invariant yield of the direct photons in d+Au collisions overthe scaled p+p cross section is consistent with unity. Theoretical calculations assuming standardcold-nuclear-matter effects describe the data well for the entire pT range. This indicates that thelarge enhancement of direct photons observed in Au+Au collisions for 1.0 < pT < 2.5 GeV/c is dueto a source other than the initial-state nuclear effects.