Production of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Δ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>in the reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pp</mml:mi><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi

Hudomalj-Gabitzsch, J.; Duck, Ian; Furić, M.; Mutchler, G. S.; Clement, J.M.; Felder, R.D.; Dragoset, W. H.; Phillips, G.C.; Allred, J.C.; Hungerford, E.; Mayes, B.; Pinsky, L.; Williams, T.

doi:10.1103/physrevc.18.2666

Cited by 46 publications

(42 citation statements)

References 22 publications

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“…Prom a comparison of our Born results using model A with the total L-absorption cross sections of [25] calculated in the iterated coupled channels model, one Ands a factor g = 1.65 at laboratory energies below 300 MeV. A calculation of the total 4-production cross section and comparison with the experimental data at 800 MeV [26] and 970 MeV [27] suggests a weak energy dependence of g so that g(730 MeV) = 1.4. The latter value is in close agreement with the result of [20].…”

Section: Resultsmentioning

confidence: 66%

“…From a comparison with recent analyses of pion photoproduction [24], we expect the A(1232) resonance and the radiative decay of the u and p to be the leading corrections. [25], and experimental 4-production data at 800 MeV [26] and 970 MeV [27], it turns out that the effect of the iteration can be simulated by a simple energy-dependent rescaling of the Born amplitude in a good approximation. We are then left basically with two sources of possible errors: (1) We superpose a (necessarily real and therefore not unitary) Born amplitude with the iterated potential model and SPA amplitudes.…”

Section: Introductionmentioning

confidence: 99%

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Δ excitation and exchange corrections forNNbremsstrahlung

Jetter

Fearing

1995

Phys. Rev. C

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The role of the relativistic amplitudes for a number of O(k) processes usually neglected in potential model calculations of NN bremsstrahlung is investigated.In particular, we consider the A excitation pole contributions related to the one-pion and one-rho exchange and in addition include the exchange contributions induced by the radiative u, p~7 rp decays. The contributions are calculated from relativistic Born amplitudes 6tted to A production and absorption data in the energy range up to 1 GeV and then used to supplement potential model and soft photon calculations for nucleon-nucleon bremsstrahlung.The eKects on NNp observables, although moderate in general, are found to be important in some kinematic domains.PACS number(s): 13.75.Cs, 25.20.x, 25.40.h

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Section: Resultsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Δ excitation and exchange corrections forNNbremsstrahlung

Jetter

Fearing

1995

Phys. Rev. C

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“…But their contributions are included in actual calculations. In addition to the ∆(1232) and the off-shell nucleon pole included in previous works [22,23,24,25], the Roper resonance is added in our calculation. For the production of the Roper resonance and the intermediate virtual nucleon, the π 0 and σ-meson exchanges are included while the ρ-meson exchange is found to give negligible contribution and is dropped.…”

Section: Formalism and Ingredientsmentioning

confidence: 99%

Role of the resonance in the reaction

et al. 2009

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New measurement by CELSIUS-WASA Collaboration on the pp → pnπ + reaction reveals clear evidence for the presence of the Roper resonance N * (1440) which has been ignored in previous theoretical calculations. In this article, based on an effective Lagrangian approach and available knowledge on the Roper resonance, we investigate the role of the Roper resonance for the pp → pnπ + reaction. It is found that the contribution from the Roper resonance N * (1440) becomes significant for kinetic energy above 1.1 * Corresponding author. ouyangzh@impcas.ac.cn; Tel: +86-10-88236162; fax: +86-10-88233085 † xiejujun@mail.ihep.ac.cn ‡ zoubs@mail.ihep.ac.cn § hushan@impcas.ac.cn 1 GeV, consistent with the new experimental observation. The t-channel σ-meson exchange is dominant for the production of the Roper resonance.

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“…Cross sections for pion production in the beam energy range from 0.6 to 1.5 GeV (excess energies between 140 and 500 MeV) have been provided in the past by many experiments [3][4][5][6][7][8]. Meanwhile, also the precision of the measurements of differential distributions, which is essential for unravelling the reaction mechanism, has been improved [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES

Agakishiev¹,

Álvarez‐Pol²,

Bałanda³

et al. 2012

Eur. Phys. J. A

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Abstract. We present measurements of exclusive π +,0 and η production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy in hadron and dielectron channels. In the case of π + and π 0 , high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptancecorrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield Page 2 of 17 Eur. Phys. J. A (2012) 48: 74 and production angular distribution of Δ(1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp → ppη, since controversial data exist at 2.0 GeV; we find σ = 0.142 ± 0.022 mb. Using the dielectron channels, the π 0 and η Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.

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Production of theΔ++in the reactionpp→pπ+

Cited by 46 publications

References 22 publications

Δ excitation and exchange corrections forNNbremsstrahlung

Δ excitation and exchange corrections forNNbremsstrahlung

Role of the resonance in the reaction

Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES

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