Δ-formation in the 1H(3He, 3H)Δ++ reaction at intermediate energies

Дмитриев, В. Ф.; Sushkov, O. P.; Gaarde, C.

doi:10.1016/0375-9474(86)90158-2

Cited by 133 publications

(129 citation statements)

References 14 publications

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“…[33], which is in excellent agreement with the data. The direct and exchange matrix elements, averaged over all the spin states, are given by…”

Section: Angular Distribution In the Nn → N∆(1232) Productionsupporting

confidence: 90%

The Pluto++ Event Generator.

Froehlich¹

2009

Proceedings of XI International Workshop on Advanced Computing and Analysis Techniques in Physics Research — PoS(ACAT)

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Pluto is a Monte-Carlo event generator designed for hadronic interactions from Pion production threshold to intermediate energies of a few GeV per nucleon, as well as for studies of heavy ion reactions. The package is entirely based on ROOT, without the need of additional packages, and uses the embedded C++ interpreter of ROOT to control the event production. The generation of events based on a single reaction chain and the storage of the resulting particle objects can be done with a few lines of a ROOT-macro. However, the complete control of the package can be taken over by the steering macro and user-defined models may be added without a recompilation of the framework. Multi-reaction cocktails can be facilitated as well using either mass-dependent or user-defined static branching ratios. The included physics uses resonance production with mass-dependent Breit-Wigner sampling. The calculation of partial and total widths for resonances producing unstable particles is performed recursively in a coupled-channel approach. Here, particular attention is paid to the electromagnetic decays, motivated by the physics program of HADES. The thermal model supports 2-component thermal distributions, longitudinal broadening, radial blast, direct and elliptic flow, and impact-parameter sampled multiplicities. The interface allows angular distribution models (e.g. for the primary meson emission) to be attached by the user as well as descriptions of multi-particle correlations using decay chain templates. The exchange of mass sampling or momentum generation models is also possible. The first feature allows for consistent coupled-channel calculations, needed for a correct description of hadronic interactions. For elementary reactions, angular distribution models for selected channels are already part of the framework, based on parameterizations of existing data. This report gives an overview of the design of the package, the included models and the user interface.

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“…[33], which is in excellent agreement with the data. The direct and exchange matrix elements, averaged over all the spin states, are given by…”

Section: Angular Distribution In the Nn → N∆(1232) Productionsupporting

confidence: 90%

The Pluto++ Event Generator.

Froehlich¹

2009

Proceedings of XI International Workshop on Advanced Computing and Analysis Techniques in Physics Research — PoS(ACAT)

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“…On the other hand, the σ meson exchange, which models the CTPE in the ππ S-wave and provides about 2/3 of this exchange in the low energy N N interaction, plays a relatively more important role. This observation has also been made in the case of N N → N N π reaction [58][59][60]30,31]. Thus, the σ meson exchange provides an efficient means of mediating the large momentum mismatch involved in the meson production reactions in N N collisions, particularly at lower beam momenta.…”

Section: A Cross Section Data For Beam Energy Above 2 Gevmentioning

confidence: 57%

“…The latter is taken to be the coherent sum of the two-body on-mass-shell elastic scattering amplitudes of the particles involved in the final channel. 58) where t i represents the two-body on-shell elastic scattering amplitude (of the interacting particles pair j − k) in the three-body space with the ith particle being the spectator. ℓ i and q i denote the partial wave and relative momentum of the j − k particle pair respectively.…”

Section: G Final State Interactionmentioning

confidence: 99%

pp→pK+Λreaction in an effective Lagrangian model

Shyam

1999

Phys. Rev. C

128

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We investigate the pp → pK + Λ reaction within an effective Lagrangian model where the contributions to the amplitudes are taken into account within the tree level. The initial interaction between the two nucleons is modeled by the exchange of π, ρ, ω and σ mesons and the ΛK + production proceeds via the excitation of the N * (1650), N * (1710), N * (1720) baryonic resonances. The parameters of the model at the nucleon-nucleon-meson vertices are determined by fitting the elastic nucleon-nucleon scattering with an effective interaction based on the exchange of these four mesons, while those at the resonance vertices are calculated from the known decay widths of the resonances as well as the vector meson dominance model. Available experimental data is described well by this approach. The one-pion-exchange diagram dominates the production process at both higher and lower beam energies. The ρ and ω meson exchanges make negligible contributions. However, the σ-exchange processes contribute substantially to the total cross sections at lower beam energies. The excitation of the N * (1710) and N * (1650) resonances dominate this reaction at beam momenta above and below 3 GeV/c respectively. The interference among the amplitudes of various resonance excitation processes is significant. For beam energies very close to the K + production threshold the hyperon-proton final state interaction effects are quite important. The data is selective about the model used to describe the low energy scattering of the two final state baryons.

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“…one-pion exchange models [48,56] or PWA [50,51,57]. The strong forward/backward peaking reflects the peripheral character of the ∆ resonance excitation.…”

Section: A Monte Carlo Simulation and Resultsmentioning

confidence: 99%

Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

Adamczewski-Musch¹,

Arnold²,

Atomssa³

et al. 2017

Phys. Rev. C

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We report on the investigation of ∆(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe + e − and ppe + e − γ have been studied and compared with the partial wave analysis of the hadronic ppπ 0 channel. They allow to access both ∆ + → pπ 0 (e + e − γ) and ∆ + → pe + e − Dalitz decay channels. The perfect reconstruction of the well known π 0 Dalitz decay serves as a proof of the consistency of the analysis. The ∆ Dalitz decay is identified for the first time and the sensitivity to N-∆ transition form factors is tested. The ∆(1232) Dalitz decay branching ratio is also determined for the first time; our result is (4.19 ± 0.62 syst. ± 0.34 stat.) × 10 −5 , albeit with some model dependence.

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Δ-formation in the 1H(3He, 3H)Δ++ reaction at intermediate energies

Cited by 133 publications

References 14 publications

The Pluto++ Event Generator.

The Pluto++ Event Generator.

pp→pK+Λreaction in an effective Lagrangian model

Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

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