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Reaction pi+ p ---> pi+ pi0 p near threshold and chiral symmetry breaking

Pocanic, D. ; Frlez, E. ; Assamagan, K.A. ; et al.

Phys.Rev.Lett. 72 (1994) 1156-1159, 1994.

Inspire Record 364090 DOI 10.17182/hepdata.19682

We have measured total cross sections for the reaction π+p→π+π−p at incident pion kinetic energies of 190, 200, 220, 240, and 260 MeV. We use this result to deduce a new value of the chiral symmetry breaking parameter, ξ=-0.25±0.10, in a global constrained fit of the five ππN near-threshold amplitudes. Consequently, we report new soft pion model values for the s-wave ππ scattering lengths.

1 data table

Table 1

No description provided.

Dip structures in pi+ p ---> rho+ p at 1.55-1.84 gev/c

Williamson, Y. ; Fung, S.Y. ; Kernan, A. ; et al.

Phys.Rev.Lett. 29 (1972) 1353-1356, 1972.

Inspire Record 75422 DOI 10.17182/hepdata.21440

Results of a high-statistics study of π++p→ρ++p at 1.55-1.84 GeVc are consistent with dominance of π and ω exchange close to threshold. A pronounced dip in ρ00sdσdt at −t≃0.4 GeV2 may be attributed to pion exchange with strong absorption.

9 data tables

Table 1

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Table 2

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Table 3

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