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Nuclear Theory·nucl-th

Tuesday·August 9, 2016

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 08

    Fission fragment mass distributions in reactions populating 200Pb

    A. Chaudhuri · A. Sen · T. K. Ghosh · K. Banerjee · Jhilam Sadhukhan · S. Bhattacharya · P. Roy · T. Roy · C. Bhattacharya · Md. A. Asgar · A. Dey · S. Kundu and 11 other authors

    The fission fragment mass distributions have been measured in the reactions 16O + 184W and 19F+ 181Ta populating the same compound nucleus 200Pb? at similar excitation energies. It is found that the widths of the mass distribution increases monotonically with excitation energy, indicating the absence of quasi-fission for both reactions. This is contrary to two recent claims of the presence of quasi-fission in the above mentioned reactions.

    ↳ nucl-exnucl-thPRC(2016)·25 citations
  2. 09

    The energy density representation of the strangeness enhancement from p+p to Pb+Pb

    E. Cuautle🇲🇽 · G. Paić🇲🇽

    The energy density is the prime parameter to define the deconfinement of quarks and gluons occurring in collisions of heavy ions. Recently, there is mounting evidence that many observables in proton-proton collisions behave in a manner very similar to the one observed in heavy ions. We present as an additional piece of evidence, a scaling of the strange particle yields as a function of the energy density of the three collision systems: p+p p+Pb and Pb+Pb, using the latest results of the ALICE collaboration.

    ↳ hep-phnucl-th13 citations
  3. 10

    The Joint Physics Analysis Center: Recent results

    Cesar Fernandez-Ramirez🇲🇽

    We review some of the recent achievements of the Joint Physics Analysis Center, a theoretical collaboration with ties to experimental collaborations, that aims to provide amplitudes suitable for the analysis of the current and forthcoming experimental data on hadron physics. Since its foundation in 2013, the group is focused on hadron spectroscopy in preparation for the forthcoming high statistics and high precision experimental data from BELLEII, BESIII, CLAS12, COMPASS, GlueX, LHCb and (hopefully) PANDA collaborations. So far, we have developed amplitudes for scattering, scattering, pion and photoproduction, two kaon photoproduction and three-body decays of light mesons (, , ). The codes for the amplitudes are available to download from the group web page and can be straightforwardly incorporated to the analysis of the experimental data.

    ↳ hep-phnucl-thJ.Phys.Conf.Ser.(2016)·1 citation
  4. 11

    Correlations in Double Parton Distributions: Perturbative and Non-Perturbative effects

    Matteo Rinaldi🇮🇹 · Sergio Scopetta🇮🇹 · Marco Claudio Traini🇫🇷 · Vicente Vento🇪🇸

    The correct description of Double Parton Scattering (DPS), which represents a background in several channels for the search of new Physics at the LHC, requires the knowledge of double parton distribution functions (dPDFs). These quantities represent also a novel tool for the study of the three-dimensional nucleon structure, complementary to the possibilities offered by electromagnetic probes. In this paper we analyze dPDFs using Poincaré covariant predictions obtained by using a Light-Front constituent quark model proposed in a recent paper, and QCD evolution. We study to what extent factorized expressions for dPDFs, which neglect, at least in part, two-parton correlations, can be used. We show that they fail in reproducing the calculated dPDFs, in particular in the valence region. Actually measurable processes at existing facilities occur at low longitudinal momenta of the interacting partons; to have contact with these processes we have analyzed correlations between pairs of partons of different kind, finding that, in some cases, they are strongly suppressed at low longitudinal momenta, while for other distributions they can be sizeable. For example, the effect of gluon-gluon correlations can be as large as 20 . We have shown that these behaviors can be understood in terms of a delicate interference of non-perturbative correlations, generated by the dynamics of the model, and perturbative ones, generated by the model independent evolution procedure. Our analysis shows that at LHC kinematics two-parton correlations can be relevant in DPS, and therefore we address the possibility to study them experimentally.

    ↳ hep-phnucl-thJHEP(2016)·43 citations

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