The Reactions p p ---> p p pi0 and p p ---> d pi+ at threshold: The Role of the isoscalar pi N scattering amplitude

Hanhart, C.; Haidenbauer, J.; Hoffmann, M.; Meissner, Ulf-G.; Speth, J.

doi:10.1016/S0370-2693(98)00216-0

The Reactions p p ---> p p pi0 and p p ---> d pi+ at threshold: The Role of the isoscalar pi N scattering amplitude

Jul, 1997

11 pages

Published in:

Phys.Lett.B 424 (1998) 8-14

e-Print:

nucl-th/9707029 [nucl-th]

DOI:

10.1016/S0370-2693(98)00216-0

Report number:

KFA-IKP-TH-1997-14

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Abstract:

We examine the role of the elementary isoscalar pion--nucleon scattering amplitude in the description of the processes

pp \to pp\pi^0

and

pp\to d\pi^+

at threshold. We argue that the presently used tree level dimension two approximation used in chiral perturbation theory is insufficient as input by direct comparison with the

\pi

N scattering data. We also show that a successful semi--phenomenological boson--exchange model does better in the description of these data. The influence of the violation of crossing symmetry in the meson--exchange model has to be studied in more detail. We stress that further investigations of the process

pp\to d\pi^+

can pave the way to a deeper understanding of the pion dominated part of the transition operator.

Note:

12 pp, LaTeX file, 4 figures (uses epsf), enlarged version, accepted for publication in Phys. Lett. B Report-no: KFA-IKP(TH)-1997-14

p p: exclusive reaction
pi: hadroproduction
final state: (2p pi0)
final state: (deuteron pi+)
threshold
pi nucleon: scattering amplitude
isoscalar
partial wave analysis
perturbation theory: chiral
meson: exchange

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