Medium effects in ρ-meson photoproduction

Riek, F.; Rapp, Ralf; Lee, T.-S.H.; Oh, Yongseok

doi:10.1016/j.physletb.2009.05.002

Cited by 22 publications

(44 citation statements)

References 32 publications

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“…The results of this experiment have been analyzed with GiBUU; a broadening of the ρ meson in line with theoretical expectations but no mass shift has been ob-99 served. A recent study on in-medium modifications of the ρ meson in connection with the CLAS data comes to a similar conclusion [337,338].…”

Section: Photoproduction Of Vector Mesonssupporting

confidence: 54%

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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Section: Photoproduction Of Vector Mesonssupporting

confidence: 54%

Transport-theoretical description of nuclear reactions

et al. 2012

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“…In this article, we improve and extend our previous work [22] in several respects. First, we refine our schematic model for estimating the density probed by the ρ meson by folding over a realistic density distribution (rather than using an average density), thereby accounting for momentum and density dependence of the decay rate.…”

Section: Introductionmentioning

confidence: 56%

“…This is to be compared to the in-medium ρ-meson width obtained for the model employed here, amounting to ∼40 MeV (for q = 2 GeV, N = 0.5 0 ; see, e.g., Fig. 4 in our previous article [22]). This estimate suggests that we may underestimate the ρ width at high momenta by up to 20 MeV.…”

Section: ρ Production and Decay In Nucleimentioning

confidence: 92%

“…[22]. The elementary photoproduction amplitude, for the process γp → e + e − p, is based on the meson-exchange model developed by two of us [21], which accounts for σ , f 2 , π , and Pomeron t-channel exchange as well as nucleon s-and u-channel pole diagrams.…”

Section: ρ Production and Decay In Nucleimentioning

confidence: 99%

“…In our previous study [22], we combined the meson-exchange model of Ref. [21] with an in-medium ρ propagator [10], which describes low-mass dilepton and photon spectra in HICs at the CERN-SPS [9].…”

Section: Introductionmentioning

confidence: 99%

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Medium modifications of theρmeson in nuclear photoproduction

et al. 2010

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We extend our recent study of dilepton invariant-mass spectra from the decays of ρ mesons produced by photon reactions off nuclei. We specifically focus on experimental spectra as recently measured by the CLAS Collaboration at the Thomas Jefferson National Accelerator Facility using carbon and iron nuclei. Building on our earlier work, we broaden our description to a larger set of observables to identify sensitivities to the medium effects predicted by microscopic calculations of the ρ spectral function. We compute mass spectra for several target nuclei and study the spectral shape as a function of the three-momentum of the outgoing lepton pair. We also compute the so-called nuclear transparency ratio, which provides an alternative means (and thus consistency check) of estimating the ρ width in the cold nuclear medium.

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The Chiral Restoration Transition of QCD and Low Mass Dileptons

Rapp¹,

Wambach²,

Hees³

2010

Relativistic Heavy Ion Physics

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108

143

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Recent developments in the evaluation of vector-meson spectral functions in hot and dense matter are discussed with emphasis on connections to the chiral phase transition in QCD. Model independent approaches including chiral low-density expansions, lattice QCD, chiral and QCD sum rules are put into context with model predictions for in-medium vector-spectral function utilizing effective Lagrangians. Hadronic manybody calculations predict a strong broadening (and little mass shift) of the ρ spectral function which rapidly increases close to the expected phase boundary of hadronic and quark-gluon matter. Pertinent dilepton rates appear to degenerate with perturbative quark-antiquark annihilation in the Quark-Gluon Plasma, suggestive for chiral symmetry restoration. Applications to low-mass dilepton spectra in heavy-ion collisions result in quantitative agreement with recent high-quality data at the CERN-SPS. Thermal radiation from temperatures around T c consistently reproduces the experimental dilepton excess observed at masses above 1 GeV as well. The interpretation of dilepton sources at high transverse momentum appears to be more involved.

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Medium effects in ρ-meson photoproduction

Cited by 22 publications

References 32 publications

Transport-theoretical description of nuclear reactions

Transport-theoretical description of nuclear reactions

Medium modifications of theρmeson in nuclear photoproduction

The Chiral Restoration Transition of QCD and Low Mass Dileptons

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