Experimental study of the reaction<i>pp</i>→<i>pp</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>in the energy range 600–900 MeV

Andreev, V. A.; Кравцов, А.В.; Makarov, M.M.; Medvedev, VI Vi; Poromov, VI Vi; Sarantsev, V.V.; Sherman, S.G.; Sokolov, G.L.; Sokornov, A. B.

doi:10.1103/physrevc.50.15

Cited by 19 publications

(26 citation statements)

References 16 publications

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“…The Δ(1232) decay has been modeled proportional to 1 + 3 cos 2 (θ), where θ is the angle of the pion (or nucleon) in the Δ rest frame with respect to the beam axis. Such a parametrization is predicted by the OPE model and also corroborated by the experimental data [34].…”

Section: Simulations and Acceptance Corrections 31 Event Generationsupporting

confidence: 61%

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

et al. 2014

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Abstract. We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of 3.5 GeV based on data measured with HADES. The exclusive channels pp → npπ + and pp → ppπ 0 as well as pp → ppe + e − are studied simultaneously for the first time. The invariant masses and angular distributions of the pion-nucleon systems were studied and compared to simulations based on a resonance model ansatz assuming saturation of the pion production by an incoherent sum of baryonic resonances (R) with masses < 2 GeV/c 2 . A very good description of the one-pion production is achieved allowing for an estimate of individual baryon resonance production cross sections which are used as input to calculate the dielectron yields from R → pe + e − decays. Two models of the resonance decays into dielectrons are examined assuming a point-like RN γ * coupling and the dominance of the ρ meson. The results of model calculations are compared to data from the exclusive ppe + e − channel by means of the dielectron and pe + e − invariant mass distributions.

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Section: Simulations and Acceptance Corrections 31 Event Generationsupporting

confidence: 61%

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

et al. 2014

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“…The dominance of the intermediate Δ(1232) production and the peripheral character of the reaction, which increases with energy, stand out very clearly in this region. Comparison of the shape of various differential distributions from both exclusive reactions pp → ppπ 0 and pp → pnπ + in the range 0.6-0.94 GeV to calculations within the one-pion exchange (OPE) show a nice agreement [10,11]. However, the magnitude of the crosssections for both reactions, regardless of the choice of the form of π-nucleon interaction, is explained by the models within an accuracy of 20-30% only.…”

Section: Introductionmentioning

confidence: 95%

“…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]. The dominance of the intermediate Δ(1232) production and the peripheral character of the reaction, which increases with energy, stand out very clearly in this region.…”

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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“…In the model proposed by Suslenko and Gaisak [8], the dominance of the one-pion exchange term was assumed leading to a qualitatively well description of experimental data collected in the energy range 0.6 − 1.0 GeV. The analysis of one-pion production channels in reactions pp → ppπ 0 and pp → npπ + (see [9][10][11][12]) leads to a good description of various differential distributions, yet the total cross sections predicted by the model are lower than the reconstructed from the experimental data. Another model describing the data in the npπ + channel in the quite wide energy range 0.97 − 4.0 GeV (see [13][14][15]), introduced by Dmitriev, Sushkov and Gaarde [16], had essentially similar assumptions of one-pion exchange but different vertex parameterization.…”

Section: Elementary Reactions and Their Descriptionmentioning

confidence: 99%