Direct observation of a rho decay of the D13(1520) baryon resonance.
The reaction gammap-->pi(+)pi(0)n has been measured at MAMI for photon energies up to 820 MeV. Invariant mass spectra of the particles in the final state (pi(+)n), (pi(0)n), (pi(+)pi(0)) have been determined for several bins of incident photon energy. Differences in pi(+)pi(0) and simultaneously measured pi(0)pi(0) invariant mass distributions are assigned to a rho branch of the D13(1520) nucleon resonance.
Langgärtner
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II. Physikalisches Institut, Universität Giessen, D-35392 Giessen, Germany.
Ahrens
J
J
Beck
R
R
Hejny
V
V
Kotulla
M
M
Krusche
B
B
Kuhr
V
V
Leukel
R
R
McGregor
J D
JD
Messchendorp
J G
JG
Metag
V
V
Novotny
R
R
Olmos de Léon
V
V
Owens
R O
RO
Rambo
F
F
Schadmand
S
S
Schmidt
A
A
Siodlaczek
U
U
Ströher
H
H
Weiss
J
J
Wissmann
F
F
Wolf
M
M