Measurement of pi(0)pi(0) production in the nuclear medium by pi(-) interactions at 0.408 GeV/c.
We report on an investigation of the (pi(-),pi(0)pi(0)) reaction by means of measurements of the pi(0)pi(0) invariant mass distributions from pi(-) interactions on H, D, C, Al, and Cu targets at p(pi(-)) = 0.408 GeV/c. The sharp, strong peak in the pi(+)pi(-) invariant mass near 2m(pi) reported by the CHAOS Collaboration is not seen in our pi(0)pi(0) data. However, we do observe a change in the shape of the pi(0)pi(0) invariant mass spectrum for the different targets, indicating that the pi(0)pi(0) interaction diminishes in the nuclear medium as represented by nuclei D, C, Al, and Cu, compared to hydrogen.
Starostin
A
A
University of California Los Angeles, Los Angeles, California 90095-1547, USA.
Staudenmaier
H M
HM
Allgower
C E
CE
Bekrenev
V
V
Berger
E
E
Briscoe
W J
WJ
Clajus
M
M
Comfort
J R
JR
Craig
K
K
Grosnick
D
D
Isenhower
D
D
Knecht
N
N
Koetke
D
D
Koulbardis
A
A
Kozlenko
N
N
Kruglov
S
S
Kycia
T
T
Lolos
G
G
Lopatin
I
I
Manley
D M
DM
Manweiler
B
B
Marusić
A
A
McDonald
S
S
Nefkens
B M
BM
Olmsted
J
J
Papandreou
Z
Z
Peaslee
D
D
Peterson
R J
RJ
Phaisangittisakul
N
N
Prakhov
S
S
Pulver
M
M
Ramirez
A F
AF
Sadler
M
M
Shafi
A
A
Slaus
I
I
Spinka
H
H
Stanislaus
S
S
Supek
I
I
Tippens
W B
WB