Correlated pi pi and K anti-K exchange in the baryon baryon interaction

Reuber, A.; Holinde, K.; Kim, Hyun-Chul; Speth, J.

doi:10.1016/0375-9474(96)00256-4

Correlated pi pi and K anti-K exchange in the baryon baryon interaction

A. Reuber
(
- Julich, Forschungszentrum
)
,
K. Holinde
(
- Julich, Forschungszentrum
)
,
Hyun-Chul Kim
(
- Julich, Forschungszentrum
)
,
J. Speth
(
- Julich, Forschungszentrum
)

Nov, 1995

51 pages

Published in:

Nucl.Phys.A 608 (1996) 243-304

e-Print:

nucl-th/9511011 [nucl-th]

DOI:

10.1016/0375-9474(96)00256-4

Report number:

KFA-IKP-TH-1995-26

View in:

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Abstract:

A dynamical model for correlated two-pion and two-kaon exchange in the baryon- baryon interaction is presented, both in the scalar-isoscalar (

\sigma

) and the vector-isovector (

\rho

) channel. The correlations between the two pseudoscalar mesons are taken into account by means of

\pi\pi - K\bar K

amplitudes derived from a meson-exchange model, which is in line with the empirical

\pi\pi

data. It is found that correlated

K\bar K

exchange plays an important role in the

\sigma

-channel for baryon-baryon states with non- vanishing strangeness. The strength of correlated

\pi\pi

plus

K\bar K

exchange in the

\sigma

-channel decreases with the strangeness of the baryon- baryon system becoming more negative. The results for correlated

\pi\pi

- exchange in the vector-isovector channel deviate from what is expected in the naive SU(3) picture for genuine

\rho

-exchange. Shortcomings of a simplified description in terms of sharp mass

\sigma

- and

\rho

-exchange are pointed out.

baryon antibaryon: exclusive reaction
pi: pair production
pair production: pi
K anti-K: hadroproduction
hadroproduction: K anti-K
exchange: two-pion
two-pion: exchange
exchange: K anti-K
K anti-K: exchange
correlation: two-pion

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