Inelastic Reactions in Proton-Deuteron Scattering at 1.825 and 2.11 GeV/<i>c</i>

Brunt, D.; Clayton, M.J.; Westwood, B.A.

doi:10.1103/physrev.187.1856

Cited by 67 publications

(54 citation statements)

References 27 publications

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“…The comparison with the limited experimental information available on this reaction [12,13,14] shows that a rough agreement in most channels can be obtained. Remaining discrepancies in some channels are discussed.…”

Section: Introductionmentioning

confidence: 96%

“…The expressions for the amplitudes of the relevant terms are written in the Appendix. As we shall see, all these terms are small except diagram (12), the one involving the excitation of a ∆ in each nucleon. This diagram is only relevant at energies T p > 1 GeV in the laboratory frame, where the terms involving crossed ∆ are small ( diagrams (13)- (15) ).…”

Section: ∆ Resonance Terms Contributionmentioning

confidence: 99%

“…These terms are smaller than those with ∆ pole because the πNN coupling is about a factor two smaller than the πN∆ one, and also because there are usually large cancellations between direct and crossed nucleon pole terms. Indeed, assume we have the diagrams (12) and (14) of Fig 1 substituting the left ∆ by a nucleon. For small momenta of the outgoing pion, on the left of the diagram we would have for the sum of the two nucleon propagators…”

Section: S−wavementioning

confidence: 99%

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Theoretical study of the NN → NNππ reaction

1998

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We have developed a model for the N N → N N ππ reaction and evaluated cross sections for the different charged channels. The low energy part of those channels where the pions can be in an isospin zero state is dominated by N * excitation, driven by an isoscalar source recently found experimentally, followed by the decay N * → N (ππ) T =0 S−wave . At higher energies, and in channels where the pions are not in T=0, ∆ excitation mechanisms become relevant. A rough agreement with the experimental data is obtained in most channels. Repercussions of the present findings for the ABC effect and the pp → ppπ 0 reaction close to threshold are also suggested.

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Section: Introductionmentioning

confidence: 96%

Section: ∆ Resonance Terms Contributionmentioning

confidence: 99%

Section: S−wavementioning

confidence: 99%

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Theoretical study of the NN → NNππ reaction

1998

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“…Preliminary results for the total cross section are shown in Fig. 1 together with previous data from Bubble chamber measurements [7][8][9]. They exhibit a smoothly and monotonically rising total cross section with some indication of a flat top in the energy region of the ABC effect.…”

Section: Experiments and Resultsmentioning

confidence: 57%

“…Energy dependence of the total cross section for the pn → ppπ 0 π − reaction. The preliminary results of this work are shown by the full circles, previous bubble-chamber measurements from KEK [7] by open circles, from NIMROD at RAL [8] by open triangles and from Gatchina [9] …”

Section: Introductionmentioning

confidence: 99%

Measurement of thepn→ppπ⁰π⁻Reaction in Search of the ABC Resonance

Skorodko

Bashkanov

Clement

et al. 2012

EPJ Web of Conferences

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Abstract.With pd collisions at T p = 1.2 GeV exclusive measurements of the quasi-free pn → ppπ 0 π − reaction have been carried out. Using the WASA detector setup at COSY total and differential cross sections have been obtained for the energy region √ s = 2.35 -2.48 GeV. Though this includes the region of the ABC effect and its associated resonance structure, no low-mass enhancement (ABC effect) is found in the π 0 π − -invariant mass spectrum -in agreement with the constraint from Bose statistics demanding the isovector pion pair to be in relative p-wave. Conventional calculations including t-channel processes for Roper, ∆(1600) and ∆∆ excitations and their decays, which are well-known from the study of the two-pion production in pp collisions, provide a reasonable description of the data at high energies, but fall low at low energies. From this we conclude that a large contribution from a so far unknown isoscalar low-energy process is missed in the calculations. Inclusion of the ABC resonance at m = 2.37 GeV with Γ = 70 MeV and I(J P ) = 0(3 + ), which was recently observed in the pn → dπ 0 π 0 reaction, leads to a much improved description of the data at low energies.

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