Open charm enhancement by secondary interactions in relativistic nucleus–nucleus collisions?

The γp → K + Λ(1520) reaction mechanism is investigated within a Regge-effective Lagrangian hybrid approach based on our previous study of this reaction [Physical Review C89, 015203 (2014)]. Near threshold and for large K + angles, both the CLAS and LEPS data can be successfully described by considering the contributions from the contact, t-channelK exchange, u-channel Λ(1115) hyperon pole, and the s-channel nucleon pole and N * (2120) resonance contributions. However, for higher energies and forward K + angles, systematic discrepancies with data appear, which hint the possible existence of sizable quark-gluon string mechanism effects. We show how the inclusion of aK Reggetrajectory exchange in the t-channel leads to an efficient description of the Λ(1520) photoproduction channel over the whole energy and angular ranges accessible in the CLAS experiment.PACS numbers: 13.75.Cs.; 14.20.-c.; 13.60.Rj.

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“…(12) exhibits a factorial growth 4 , which is in principle not acceptable [29]. Accordingly, the authors of Refs.…”

Section: B Regge Contributionsmentioning

confidence: 99%

Regge signatures from CLASΛ(1520)photoproduction data at forward angles

2014

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“…The factor ((m 3 + m 4 )/ √ s) 6 in (10) accounts for the suppression of binary channels with increasing √ s and has been fitted to the experimental data for the reactions π + N → ρ + N, ω + N, φ + N, K + + Λ in Ref. 143 . We use the same matrix elements for the dissociation of all charmonium states i (i = χ c , J/Ψ, Ψ ′ ) with mesons:…”

Section: 'Comover' Suppression (And Recombination)mentioning

confidence: 99%

Open and Hidden Charm in Proton–nucleus and Heavy-Ion Collisions

Linnyk

Bratkovskaya

Cassing

2008

Int. J. Mod. Phys. E

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We review the collectivity and the suppression pattern of charmed mesons -produced in proton-nucleus and nucleus-nucleus collisions at SPS (∼ 158 A·GeV) and RHIC energies (∼ 21 A·TeV) -in comparison to dynamical and thermal models. In particular, we examine the charmonium 'melting' and the 'comover dissociation' scenarios -implemented in a microscopic transport approach -in comparison to the available data from the SPS and RHIC. The analysis shows that the dynamics of c,c quarks at RHIC are dominated by partonic or 'pre-hadronic' interactions in the strongly coupled plasma stage and can neither be modeled by 'hadronic' interactions nor described appropriately by color screening alone. Both the 'charmonium melting' and the hadronic 'comover absorption and recreation model' are found, however, to be compatible with the experimental observation at SPS energies; the experimental ratio of Ψ ′ /J/Ψ versus centrality clearly favors the 'hadronic comover' scenario. We find that the collective flow of charm in the purely hadronic Hadron-String Dynamics (HSD) transport appears compatible with the data at SPS energies, but substantially underestimates the data at top RHIC energies. Thus, the large elliptic flow v 2 of D-mesons and the low R AA (p T ) of J/Ψ seen experimentally have to be attributed to early interactions of non-hadronic degrees of freedom. Simultaneously, we observe that non-hadronic interactions are mandatory in order to describe the narrowing of the J/Ψ rapidity distribution from pp to central Au + Au collisions at the top RHIC energy of √ s = 200 GeV. We demonstrate additionally that the strong quenching of high-p T J/Ψ's in central Au + Au collisions indicates that a large fraction of final J/Ψ mesons is created by a coalescence mechanism close to the phase boundary. Throughout this review we, furthermore, provide predictions for charm observables from Au+Au collisions at FAIR energies of 25 -35 A·GeV.

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“…The intensive charm production in secondary πN -collisions [7] can be considered an important source of leptonic pairs in the intermediate mass region [8].…”

Section: Introductionmentioning

confidence: 99%

Threshold open charm production in nucleon-nucleon collisions

Rekalo

Tomasi–Gustafsson

2003

Eur Phys J A

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The associative charm particles production in nucleon-nucleon collisions N +N → Λc(Σc)+D+N , is described in a general way and the spin and isospin structure of the corresponding matrix elements are derived. Using an analogy with strange particle (ΛK)-production, the D−meson exchange model is considered in detail. Estimations of the energy behavior of the threshold cross sections show a large dependence on the form of the phenomenological hadron form factors and indicate that, at threshold, the cross section is three order of magnitude smaller than for strange particle production.

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Open charm enhancement by secondary interactions in relativistic nucleus–nucleus collisions?

Cited by 28 publications

References 35 publications

Regge signatures from CLASΛ(1520)photoproduction data at forward angles

Regge signatures from CLASΛ(1520)photoproduction data at forward angles

Open and Hidden Charm in Proton–nucleus and Heavy-Ion Collisions

Threshold open charm production in nucleon-nucleon collisions

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