ChPT Calculation for Two Pion Production in NN Collision Reaction at Threshold

Liu, B. C.

doi:10.1007/s00601-012-0391-5

Cited by 3 publications

(1 citation statement)

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“…Since the chiral perturbation theory calculations for two-pion production in NN collisions are available only near threshold [40], several phenomenological models have been suggested for the analysis of the double pion production in NN collisions in the GeV energy range. The first theoretical developments related to the two-pion production were based on the one-pion exchange (OPE) model [41].…”

Section: Introductionmentioning

confidence: 99%

Study of the quasi-free $np \to np π^+π^-$ reaction with a deuterium beam at 1.25 GeV/nucleon

Agakishiev,

Balanda,

Belver

et al. 2015

Preprint

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The tagged quasi-free np → npπ + π − reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam energy of 1.25 GeV/nucleon ( √ s ∼ 2.42 GeV/c for the quasi-free collision). For the first time, differential distributions of solid statistics for π + π − production in np collisions have been collected in the region corresponding to the large transverse momenta of the secondary particles. The invariant mass and angular distributions for the np → npπ + π − reaction are compared with different models. This comparison confirms the dominance of the t-channel with ∆∆ contribution. It also validates the changes previously introduced in the Valencia model to describe two-pion production data in other isospin channels, although some deviations are observed, especially for the π + π − invariant mass spectrum. The extracted total cross section is also in much better agreement with this model. Our new measurement puts useful constraints for the existence of the conjectured dibaryon resonance at mass M∼ 2.38 GeV and with width Γ ∼ 70 MeV.

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Section: Introductionmentioning

confidence: 99%