Near-threshold photoproduction of Lambda(1520) from protons and deuterons.
Photoproduction of Lambda(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K+/0 angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K+ angles.
Muramatsu
N
N
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
Chen
J Y
JY
Chang
W C
WC
Ahn
D S
DS
Ahn
J K
JK
Akimune
H
H
Asano
Y
Y
Daté
S
S
Ejiri
H
H
Fujimura
H
H
Fujiwara
M
M
Fukui
S
S
Hasegawa
S
S
Hicks
K
K
Horie
K
K
Hotta
T
T
Imai
K
K
Ishikawa
T
T
Iwata
T
T
Kato
Y
Y
Kawai
H
H
Kino
K
K
Kohri
H
H
Kumagai
N
N
Makino
S
S
Matsuda
T
T
Matsumura
T
T
Matsuoka
N
N
Mibe
T
T
Miyabe
M
M
Miyachi
M
M
Nakano
T
T
Niiyama
M
M
Nomachi
M
M
Ohashi
Y
Y
Ohkuma
H
H
Ooba
T
T
Oshuev
D S
DS
Rangacharyulu
C
C
Sakaguchi
A
A
Shagin
P M
PM
Shiino
Y
Y
Shimizu
H
H
Sugaya
Y
Y
Sumihama
M
M
Toi
Y
Y
Toyokawa
H
H
Wakai
A
A
Wang
C W
CW
Wang
S C
SC
Yonehara
K
K
Yorita
T
T
Yoshimura
M
M
Yosoi
M
M
Zegers
R G T
RG