The role of the Roper resonance in n p --> d (pi pi)

Abstract

In this work, a model for the n p --> d (pi pi) reaction is developed. It is shown that the structure of the deuteron momentum spectra for a neutron beam momentum of 1.46 GeV can be explained as a consequence of the interplay of two mechanisms involving the excitation of the N^*(1440) resonance and its subsequent decay into N (pi pi)^{T=0}_{S-wave} and Delta pi respectively. The relevance of the present analysis for the study of the Roper excitation and decay properties, as well as for the interpretation of other two-pion production experiments is discussed.

13 pages, 6 ps figures

References in corpus (5)

• Chiral Dynamics in Nucleons and Nuclei
• Theoretical study of the N N --> N N pi pi reaction
• The reaction $\pi N\to \pi \pi N$ at threshold in chiral perturbation theory
• The N*(1520) ---> Delta pi Amplitudes Extracted from the gamma p ---> pi+ pi- p Reaction and Comparison to Quark Models
• An explanation of the ABC enhancement in the dd -> alpha X reaction at intermediate energies

Cited by in corpus (27)

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• Close-to-threshold Meson Production in Hadronic Interactions
• Quark models of dibaryon resonances in nucleon-nucleon scattering
• Phenomenological analysis of the double pion production in nucleon-nucleon collisions up to 2.2 GeV
• Exclusive Measurements of $pd{\to }^{3}He\pi \pi$ : the $ABC$ Effect Revisited
• ABC effect as a signal of chiral symmetry restoration in hadronic collisions
• Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production
• Exclusive Measurements of pp -> dpi+pi0: Double-Pionic Fusion without ABC Effect
• Neutrino induced threshold production of two pions and N^*(1440) electroweak form factors
• The two pion decay of the Roper resonance
• Constraints on a possible dibaryon from combined analysis of the $pn\to d{\pi }^{+}{\pi }^{-}$ and $pn\to pn{\pi }^{+}{\pi }^{-}$ cross sections
• Exclusive measurement of two-pion production in the dd --> 4Hepipi reaction
• Effective Field Theory calculations of $NN\to NN\pi$
• Evidence of a dibaryon spectrum in coherent ${\pi }^0{\pi }^{0}d$ photoproduction at forward deuteron angles
• Single- and Double-Pion Production in Nucleon Collisions on the Nucleon and on Nuclei -- the ABC Effect and its Possible Origin in a Dibaryonic Resonance
• Phenomenological study on the $\bar{p}N\to \bar{N}N\pi \pi$ reactions
• The pi N -> pi pi N reaction around the N(1440) energy
• Renormalization of the f0(980) and a0(980) scalar resonances in a nuclear medium
• Microscopic $NN\to N{N}^{\ast }(1440)$ transition potential: Determination of $\pi N{N}^{\ast }(1440)$ and $\sigma N{N}^{\ast }(1440)$ coupling constants
• Chiral perturbation theory calculation for pn -> dpipi at threshold
• Resonance-like coherent production of a pion pair in the reaction $pd\to pd\pi \pi$ in the GeV region
• Double pion production in $NN$ and $\bar{N}N$ collisions
• A microscopic NN to NN*(1440) potential
• The ABC Effect in Double-Pionic Nuclear Fusion and a pn Resonance as its Possible Origin
• Multi-pion production in the d d -> alpha X reaction