Deeply inelastic pions in the exclusive reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>e</mml:mi><mml:mo>,</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mi>n</mml:mi></mml:math>above the resonance region

Kaskulov, M.; Gallmeister, K.; Mosel, U.

doi:10.1103/physrevd.78.114022

Cited by 37 publications

(104 citation statements)

References 27 publications

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“…The latter dependence may be expected if σ L scaled according to the hard scattering prediction and σ T as in Deep Inelastic Scattering (DIS). This would be consistent with recent theoretical work, which suggested that σ T could be described as the semi-inclusive production limit through the fragmentation mechanism [27]. For both pions and kaons, at small values of −t and x B this fit form seems to agree better with the data, while bins with larger −t or x B seem to favor the hard scattering fit form.…”

supporting

confidence: 80%

Global analysis of exclusive kaon and pion electroproduction

Horn

2012

Phys. Rev. C

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supporting

confidence: 80%

Global analysis of exclusive kaon and pion electroproduction

Horn

2012

Phys. Rev. C

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“…[271]. The microscopic input for the primary interaction of the virtual photon with the nucleon follows the GiBUU model which describes both the transverse and the longitudinal cross sections [272]. The coupled-channel GiBUU transport model has been used to describe the FSI of hadrons in the nuclear medium.…”

Section: Exclusive Pion Productionmentioning

confidence: 99%

“…The idea proposed in [272,273,433] is to treat exclusive meson production as an exclusive limit of semi-inclusive DIS. This is in spirit of the exclusive-inclusive connection [434].…”

Section: Appendix C6 Deep-inelastic Scatteringmentioning

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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“…[9]. The approach followed there is to complement the hadron-like interaction types in the t channel, which dominate in photoproduction and low Q 2 electroproduction, by a direct interaction of virtual photons with partons followed by string (quark) fragmentation into π + n. Then σ T can be readily explained and both σ L and σ T can be described from low to high values of Q 2 .…”

mentioning

confidence: 98%

Deep exclusive electroproduction ofπ+from data measured with the HERMES detector at DESY

Kaskulov¹,

Mosel

2009

Phys. Rev. C

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Deeply virtual electroproduction of pions in an exclusive reaction p(e,e π + )n is studied using a two-component model that includes soft hadronic and hard partonic reaction mechanisms. The results are compared with the experimental data measured at HERMES in the deep inelastic region for values of Q 2 > 1 GeV 2 and W 2 > 10 GeV 2 . At forward angles the π + cross section is longitudinal and is dominated by exchange of Regge poles, with π being the dominant trajectory. The off-forward region with −t > 1 GeV 2 is transverse and shows the dominance of partonic subprocesses. An implication of the present results for the future JLab facilities is briefly discussed.Exclusive electroproduction of pions in the reactionat high values of photon virtuality Q 2 and invariant mass W of produced hadronic final state provides an interesting tool to study a space-time pattern of partonic interactions in deep inelastic scattering (DIS). It may further reveal the partonic substructure of participating hadrons, correlating the longitudinal momentum fraction carried by quarks to transverse coordinates. This latter property of the hard exclusive reaction N (e,e π )N follows from the QCD factorization theorem that was proven for hard Q 2 2 QCD electroproduction of mesons by longitudinal photons γ * L [1]. Predictions for the production by transverse virtual photons γ * T are absent because no factorization theorem has been proven for such photons. However, their contribution to the cross section is expected to be suppressed by at least a power of 1/Q 2 . Yet, above the resonance region W 2 > 4 GeV 2 the exclusive reaction (γ * ,π ± ) with charged pions provides important information concerning the electromagnetic form factor of the pion at momentum transfer Q 2 being much bigger than in the direct scattering of pions from atomic electrons [2]. Experimentally, the differential cross sections in the exclusive reaction p(γ * ,π + )n has been measured above the resonance region at CEA [3], Cornell [4], DESY [5], and recently at JLab [6]. At JLab a separation of cross sections into different transverse and longitudinal components has been carried out. The HERMES data at DESY [7] largely extend the kinematic region to much higher values of W toward the true DIS region Q 2 1 GeV 2 and much higher values of −t. Theoretically, there is a long-standing issue concerning the reaction mechanisms contributing to the single pion N(e,e π )N production at high energies and photon virtualities. Just above the resonance region around the onset of the deep inelastic regime the models describing the exclusive pion production p(e,e π + )n in terms of hadronic degrees of freedom fail to reproduce the large transverse cross section σ T observed in this reaction. For instance, the hadron-exchange * murat.kaskulov@theo.physik.uni-giessen.de models, which are generally considered to be a guideline for the experimental analysis and extraction of the pion form factor, underestimate grossly σ T at the highest values of Q 2 measured at JLab [6], whereas the longit...

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Deeply inelastic pions in the exclusive reactionp(e,e′π+)nabove the resonance region

Cited by 37 publications

References 27 publications

Global analysis of exclusive kaon and pion electroproduction

Global analysis of exclusive kaon and pion electroproduction

Transport-theoretical description of nuclear reactions

Deep exclusive electroproduction ofπ+from data measured with the HERMES detector at DESY

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