Meson - baryon dynamics in the nucleon - anti-nucleon system. 2. Annihilation into two mesons

Mull, V.; Haidenbauer, J.; Hippchen, T.; Holinde, K.

doi:10.1103/PhysRevC.44.1337

Meson - baryon dynamics in the nucleon - anti-nucleon system. 2. Annihilation into two mesons

Apr 15, 1991

44 pages

Published in:

Phys.Rev.C 44 (1991) 1337-1353

DOI:

10.1103/PhysRevC.44.1337

Report number:

KFA-IKP-TH-1991-4

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Abstract: (APS)

The annihilation of the nucleon-antinucleon (NN¯) system into two mesons including π, η, η’, ρ, ω, δ, a1, a2, f2 as well as K and K* is studied in a distorted-wave Born-approximation approach, in the conventional framework based on nucleon, delta-isobar, and hyperon (Λ,Σ,Y*) exchange. Results for branching ratios are in fair agreement with the data; they show a strong sensitivity to the kind of initial-state interaction used. For polarizations and backward differential cross-section data of pp¯→π+π−,K+K−, there are characteristic discrepancies between experiment and model predictions; possible reasons are discussed.

nucleon antinucleon: annihilation
annihilation: nucleon antinucleon
model: interaction
interaction: model
distorted wave Born approximation
Delta(1232): exchange
exchange: Delta(1232)
hyperon: exchange
exchange: hyperon
branching ratio

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