The pp → ppπ0 reaction near the kinematical threshold

Bondar, A.; Calén, H.; Carius, Staffan; Ekström, C.; Fransson, K.; Gustafsson, L.; Häggström, S.; Höistad, B.; Johansson, A.; Johansson, T.; Kilian, K.; Kullander, S.; Kupść, A.; Kuzmin, A.; Morosov, B.; Mörtsell, A.; Oelert, W.; Povtorejko, A.; Reistad, D.; Ruber, Roger; Sandukovsky, S.; Schuberth, U.; Shwartz, B.; Steṕaniak, J.; Суханов, А.; Tchernyshev, V.; Waters, M.; Wilhelmi, Z.; Zabierowski, J.; Złomańczuk, J.

doi:10.1016/0370-2693(95)00794-l

Cited by 80 publications

(17 citation statements)

References 18 publications

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“…In a recent study of the pp → ppπ 0 reaction at energies close to threshold, it is found that the angular distributions of the outgoing particles are isotropic, in agreement with the assumption that the reaction proceeds as a 33 P 0 → 31 S 0 s 0 transition [1,2]. Several model calculations [3][4][5][6] of S-wave pion production, which are based on a single nucleon and a pion rescattering mechanism, under estimate the cross section by a factor of 3-5.…”

Section: Introductionsupporting

confidence: 52%

S-ware π0 production in pp collisions in a OBE model

Gedalin¹,

Moalem²,

Rasdolskaya³

1999

Nuclear Physics A

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The total cross section for the pp → ppπ 0 reaction at energies close to threshold is calculated using a covariant one-boson-exchange model, where a boson B created on one of the incoming protons is converted into a neutral pion on the second. The amplitudes for the conversion processes, BN → N π 0 , are taken to be the sum of s, u and t-channel pole terms. The main contributions to the primary production amplitude is due to an effective isoscalar σ meson pole in a t-channel, which is enhanced strongly due to offshellness. With this contribution included the model reproduces, both the scale and energy dependence of the cross section.

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Section: Introductionsupporting

confidence: 52%

S-ware π0 production in pp collisions in a OBE model

Gedalin¹,

Moalem²,

Rasdolskaya³

1999

Nuclear Physics A

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“…B.50). The process, NN → NNπ, has been extensively studied in several experiments over the last twenty years [112,113,114,115,116,117,118]. We have, therefore, constructed well defined background cross sections on top of the resonance contributions for all possible isospin channels.…”

Section: Three-body Collisionsmentioning

confidence: 99%

Transport-theoretical description of nuclear reactions

et al. 2012

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In this review we first outline the basics of transport theory and its recent generalization to offshell transport. We then present in some detail the main ingredients of any transport method using in particular the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) implementation of this theory as an example. We discuss the potentials used, the ground state initialization and the collision term, including the in-medium modifications of the latter. The central part of this review covers applications of GiBUU to a wide class of reactions, starting from pion-induced reactions over proton and antiproton reactions on nuclei to heavy-ion collisions (up to about 30 AGeV). A major part concerns also the description of photon-, electron-and neutrino-induced reactions (in the energy range from a few 100 MeV to a few 100 GeV). For this wide class of reactions GiBUU gives an excellent description with the same physics input and the same code being used. We argue that GiBUU is an indispensable tool for any investigation of nuclear reactions in which final-state interactions play a role. Studies of pion-nucleus interactions, nuclear fragmentation, heavy-ion reactions, hypernucleus formation, hadronization, color transparency, electronnucleus collisions and neutrino-nucleus interactions are all possible applications of GiBUU and are discussed in this article.

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“…All terms subdominant to the ones above are model-dependent. Precise cross section data measured in Bloomington [1] and Uppsala [2] are roughly five times larger [3] than the simplest widely agreed-on prediction of the two diagrams in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

A next-to-next-to-leading-order pp→ppπ0 transition operator in chiral perturbation theory

et al. 1999

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We discuss the results of a systematic calculation of the next-to-next-to-leading-order amplitude for the pp → ppπ 0 S-wave production at the threshold in heavy-baryon chiral perturbation theory. We find six new diagrams, two of which can be viewed as vertex corrections, of 15 -20 %, to the π-exchange graph, whereas the rest are much larger, one exceeding 900 %. We discuss the reasons for this enhancement, as well as the steps necessary to be taken before the final comparison with experiment.

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The pp → ppπ0 reaction near the kinematical threshold

Cited by 80 publications

References 18 publications

S-ware π0 production in pp collisions in a OBE model

S-ware π0 production in pp collisions in a OBE model

Transport-theoretical description of nuclear reactions

A next-to-next-to-leading-order pp→ppπ0 transition operator in chiral perturbation theory

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