Coupled-channel potential for nucleons and deltas

Haidenbauer, J.; Holinde, K.; Johnson, Mikkel B.

doi:10.1103/physrevc.48.2190

Cited by 51 publications

(96 citation statements)

References 21 publications

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“…The effect of ∆∆ components has been considered when studying NN phase shifts at intermediate energies and deuteron properties at the baryon level [93,94]. This treatment suffers from the same shortcomings mentioned in the N∆ case.…”

Section: The ∆∆ Interactionmentioning

confidence: 99%

Quark-model study of few-baryon systems

et al. 2005

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Abstract. We review the application of non-relativistic constituent quark models to study one, two and three non-strange baryon systems. We present results for the baryon spectra, potentials and observables of the NN, N∆, ∆∆ and NN * (1440) systems, and also for the binding energies of three non-strange baryon systems. We make emphasis on observable effects related to quark antisymmetry and its interplay with quark dynamics.

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Section: The ∆∆ Interactionmentioning

confidence: 99%

Quark-model study of few-baryon systems

et al. 2005

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“…Ref. [13] where this interference was shown for CCF [37] and CD Bonn [41] potentials. As a consequence, the direct pion production operator does not introduce any apparent cutoff dependence for the three N N potentials as can be seen in the right panel of the Fig.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Another model, the CCF model, uses the coupled-channel folded diagrams formalism to include N N → N N and N N → N ∆ transitions, see Ref. [37]. The resulting framework will be referred to as the coupled-channel ∆-full chiral EFT approach (CCχEFT−∆).…”

Section: Formalismmentioning

confidence: 99%

“…The short-range parts of the N ∆ and ∆∆ interactions are constrained by fitting the N N observables [36,37]. Since the N N and N ∆ states are coupled, the full pion-production amplitude also receives contributions from diagrams containing initial and final N ∆ states as shown in Fig.…”

Section: B Effects Of the ∆(1232) On The Threshold Pion-production Amentioning

confidence: 99%

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Threshold pion production in proton-proton collisions at NNLO in chiral EFT

et al. 2016

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The reaction N N → N N π offers a good testing ground for chiral effective field theory at intermediate energies. It challenges our understanding of the first inelastic channel in nucleon-nucleon scattering and of the charge-symmetry breaking pattern in hadronic reactions. In our previous studies, we presented a complete calculation of the pion-production operator for s-wave pions upto-and-including next-to-next-to-leading order (NNLO) in the formulation of chiral effective field theory, which includes pions, nucleons and ∆(1232) degrees of freedom. In this paper we calculate the near threshold cross section for the pp → dπ + reaction by performing the convolution of the obtained operators with nuclear wave functions based on modern phenomenological and chiral potentials. The available chiral N N wave functions are constructed with a cutoff comparable with the momentum transfer scale inherent in pion production reactions. Hence, a significant portion of the dynamical intermediate-range physics is thereby cut off by them. On the other hand, the NNLO amplitudes evaluated with phenomenological wave functions appear to be largely independent of the N N model used and give corrections to the dominant leading order contributions as expected from dimensional analysis. The result gives support to the counting scheme used to classify the pion production operators, which is a precondition for a reliable investigation of the chirally suppressed neutral pion production. The explicit inclusion of the ∆(1232) is found to be important but smaller than expected due to cancellations.

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“…channel coupling is weak [34,35]. The quality of this approximation was also checked by explicit calculations of the d-wave production amplitudes within chiral effective field theory up to order m π /m N (NNLO) [36].…”

Section: Partial Wave Decompositionmentioning

confidence: 99%

Measurement of spin observables in the quasifreenp→{pp}sπ−reaction at 353 MeV

Dymov¹,

Shmakova²,

Azaryan³

et al. 2013

Phys. Rev. C

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The transverse spin correlations Ax,x and Ay,y have been measured in the d p → pspec{pp}sπ − reaction at COSY-ANKE at 353 MeV per nucleon. Here {pp}s denotes a proton-proton pair with low excitation energy, which is dominantly in the 1 S0 state. By measuring three protons in the final state it was possible to extract events where there was a spectator proton pspec so that the reaction could be interpreted in terms of quasi-free n p → {pp}sπ − . The proton analyzing power in this reaction was also deduced from this data set by averaging over the polarization of the deuteron beam. The values of A p y were shown to be consistent with a refined analysis of our earlier results obtained with a polarized proton incident on a deuterium target. Taking these data in combination with our previous measurements of the differential cross sections and analyzing powers in the pp → {pp}s π 0 reaction, a more robust partial wave decomposition was achieved. Three different acceptable solutions were found and the only way of resolving this ambiguity without further theoretical input would be through a measurement of the mixed spin-correlation parameter Ax,z.

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Coupled-channel potential for nucleons and deltas

Cited by 51 publications

References 21 publications

Quark-model study of few-baryon systems

Quark-model study of few-baryon systems

Threshold pion production in proton-proton collisions at NNLO in chiral EFT

Measurement of spin observables in the quasifreenp→{pp}sπ−reaction at 353 MeV

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