Polarization transfer in the 4He(e,e'p)3H reaction at Q2=0.8 and 1.3 (GeV/c)2.
Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3H reaction at Q{2}=0.8 and 1.3  (GeV/c){2} with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e,e'p) reaction, contradicting a relativistic distorted-wave approximation and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.
Paolone
M
M
University of South Carolina, Columbia, South Carolina 29208, USA.
Malace
S P
SP
Strauch
S
S
Albayrak
I
I
Arrington
J
J
Berman
B L
BL
Brash
E J
EJ
Briscoe
B
B
Camsonne
A
A
Chen
J-P
JP
Christy
M E
ME
Chudakov
E
E
Cisbani
E
E
Craver
B
B
Cusanno
F
F
Ent
R
R
Garibaldi
F
F
Gilman
R
R
Glamazdin
O
O
Glister
J
J
Higinbotham
D W
DW
Hyde-Wright
C E
CE
Ilieva
Y
Y
de Jager
C W
CW
Jiang
X
X
Jones
M K
MK
Keppel
C E
CE
Khrosinkova
E
E
Kuchina
E
E
Kumbartzki
G
G
Lee
B
B
Lindgren
R
R
Margaziotis
D J
DJ
Meekins
D
D
Michaels
R
R
Park
K
K
Pentchev
L
L
Perdrisat
C F
CF
Piasetzky
E
E
Punjabi
V A
VA
Puckett
A J R
AJ
Qian
X
X
Qiang
Y
Y
Ransome
R D
RD
Saha
A
A
Sarty
A J
AJ
Schulte
E
E
Solvignon
P
P
Subedi
R R
RR
Tang
L
L
Tedeschi
D
D
Tvaskis
V
V
Udias
J M
JM
Ulmer
P E
PE
Vignote
J R
JR
Wesselmann
F R
FR
Wojtsekhowski
B
B
Zhan
X
X