Chiral dynamics in the gamma p ---> pi0 eta p and gamma p ---> pi0 K0 Sigma+ reactions

Doring, M.; Oset, E.; Strottman, D.

doi:10.1103/PhysRevC.73.045209

Chiral dynamics in the gamma p ---> pi0 eta p and gamma p ---> pi0 K0 Sigma+ reactions

M. Doring
(
- Valencia U. and
- Valencia U., IFIC
)
,
E. Oset
(
- Valencia U. and
- Valencia U., IFIC
)
,
D. Strottman
(
- Valencia U. and
- Valencia U., IFIC and
- Los Alamos
)

Oct, 2005

22 pages

Published in:

Phys.Rev.C 73 (2006) 045209

e-Print:

nucl-th/0510015 [nucl-th]

DOI:

10.1103/PhysRevC.73.045209

Report number:

IFIC-040-225

View in:

pdf

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Abstract:

Using a chiral unitary approach for meson-baryon scattering in the strangeness zero sector, where the

N^*(1535)

resonance is dynamically generated, we study the reactions

\gamma p \to \pi^0 \eta p

and

\gamma p \to \pi^0 K^0 \Sigma^+

at photon energies at which the final states are produced close to threshold. Among several reaction mechanisms, we find the most important is the excitation of the

\Delta^*(1700)

state which subsequently decays into a pseudoscalar meson and a baryon belonging to the

\Delta(1232)

decuplet. Hence, the reaction provides useful information with which to test current theories of the dynamical generation of the low-lying

3/2^-

states. The first reaction is shown to lead to sizable cross sections and the

N^*(1535)

resonance shape is seen clearly in the

\eta p

invariant mass distribution. The same dynamical model is shown to lead to much smaller cross sections at low energies in the second reaction. Predictions are made for cross sections and invariant mass distributions which can be compared with forthcoming experiments at ELSA.

11.30.Rd
25.20.Lj
photon p: exclusive reaction
pi0: photoproduction
eta: associated production
mass spectrum: (p eta)
mass spectrum: (p pi0)
K0: associated production
Sigma+: associated production
mass spectrum: (Sigma+ K0)

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