170 research outputs found

    Effects of Minijets on Common Observables in Heavy-Ion Collisions with Uncommon Implications

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    In this brief review of the observable effects of minijets in heavy-ion collisions the main points emphasized are that the quadruple moment v2(pT,b)v_2(p_T,b) and the hadronic (Ď€\pi and pp) spectra at low pTp_T can both be reproduced by minijet contributions to the recombination of thermal and shower partons. Without using hydrodynamics the minijet approach does not trace the evolution of the expanding system. The thermal distribution of the medium partons at the time of hadronization is assumed, but rapid thermalization initially is not required so as to allow minijets to leave their footprints on the system in the final state. Azimuthal anisotropy due to minijets is directly calculated in the momentum space without any fluid assumption relating the spatial eccentricity to v2v_2. There are no more parameters used, compared to the hydro approach in fitting the data on v2v_2 and pTp_T spectra. Thus both approaches satisfy the sufficiency condition for a viable description of the dynamical process involved.Comment: 15 pages, invited mini-review published in Int. J. Modern Physics E, vol 2

    Relating Meson and Baryon Fragmentation Functions by Shower-Parton Recombination

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    We relate the fragmentation functions of partons into mesons and baryons in the framework of recombination of shower partons. The results are in reasonable agreement with the data. The implication is that the meson and baryon fragmentation functions are not independent when hadronization of the shower partons are taken into account. The conclusion therefore closes a conceptual gap in the system of fragmentation functions whose Q2Q^2 evolution has been more extensively studied than their interrelationship.Comment: 10 pages in LaTex + 3 figures in ep

    Proton enhancement at large p_T at LHC without structure in associated-particle distribution

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    The production of pions and protons in the pTp_T range between 10 and 20 GeV/c for Pb+Pb collisions at LHC is studied in the recombination model. It is shown that the dominant mechanism for hadronization is the recombination of shower partons from neighboring jets when the jet density is high. Protons are more copiously produced than pions in that pTp_T range because the coalescing partons can have lower momentum fractions, but no thermal partons are involved. The proton-to-pion ratio can rise beyond 20. When such a high pTp_T hadron is used as a trigger particle, there will not be any associated particles that are not in the background.Comment: Revised version with new material adde
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