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Nuclear Theory·nucl-th

Tuesday·January 5, 2016

16 papers—11 primary·5 cross-listed

All16Primary11Cross-lists5
  1. 12

    Two Cold Atoms in a Time-Dependent Harmonic Trap in One Dimension

    M. Ebert · A. Volosniev · H.-W. Hammer

    We analyze the dynamics of two atoms with a short-ranged pair interaction in a one-dimensional harmonic trap with time-dependent frequency. Our analysis is focused on two representative cases: (i) a sudden change of the trapping frequency from one value to another, and (ii) a periodic trapping frequency. In case (i), the dynamics of the interacting and the corresponding non-interacting systems turn out to be similar. In the second case, however, the interacting system can behave quite differently, especially close to parametric resonance. For instance, in the regions where such resonance occurs we find that the interaction can significantly reduce the rate of energy increase. The implications for applications of our findings to cool or heat the system are also dicussed.

    ↳ cond-mat.quant-gasnucl-thquant-phAnnalen Phys.(2016)·7 citations
  2. 13

    Soft-collinear effective theory for hadronic and nuclear collisions: The evolution of jet quenching from RHIC to the highest LHC energies

    Ivan Vitev🇺🇸

    In the framework of soft-collinear effective theory with Glauber gluons, results and predictions for inclusive hadron suppression, based upon in-medium parton shower evolution, are presented for Au+Au and Pb+Pb collisions at RHIC and LHC energies AGeV and ATeV, respectively. The medium-induced splitting kernels are further implemented to evaluate the attenuation of reconstructed jet cross in such reactions and to examine their centrality and radius dependence. Building upon a previously developed method to systematically resum the jet shape at next-to-leading logarithmic accuracy, a quantitative understanding of the jet shape modification measurement in Pb+Pb collisions at ATeV at the LHC can be achieved. Predictions for photon-tagged jet cross sections and shapes, that can shed light on the parton flavor dependence of in-medium parton shower modification, are also given.

    ↳ hep-phnucl-thNPA(2016)·0 citations
  3. 14

    Heavy Quark and Quarkonium Transport in High Energy Nuclear Collisions

    Kai Zhou🇨🇳 · Wei Dai🇨🇳 · Nu Xu🇺🇸 · Pengfei Zhuang🇨🇳

    The strong interaction between heavy quarks and the quark gluon plasma makes the open and hidden charm hadrons be sensitive probes of the deconfinement phase transition in high energy nuclear collisions. Both the cold and hot nuclear matter effects change with the colliding energy and significantly influence the heavy quark and charmonium yield and their transverse momentum distributions. The ratio of averaged quarkonium transverse momentum square and the elliptic flow reveal the nature of the QCD medium created in heavy ion collisions at SPS, RHIC and LHC energies.

    ↳ hep-phnucl-thNPA(2016)·4 citations
  4. 15

    Massive dark photons in a Higgs portal model

    Dimiter Hadjimichef🇧🇷

    An extension of the Standard Model with a hidden sector which consists of gauge singlets (a Dirac fermion and a scalar ) plus a vector boson (dark massive photon) is studied. The singlet scalar interacts with the Standard Model sector through the triple and quartic scalar interactions, while the singlet fermion and vector boson field interact with the Standard Model only via the singlet scalar. The scalar field generates the vector boson's mass. Perspectives for future colliders is considered.

    ↳ hep-phnucl-thAIP Conf.Proc.(2015)·3 citations
  5. 16

    Zero energy scattering calculation in Euclidean space

    J. Carbonell🇫🇷 · V.A. Karmanov🇷🇺

    We show that the Bethe-Salpeter equation for the scattering amplitude in the limit of zero incident energy can be transformed into a purely Euclidean form, as it is the case for the bound states. The decoupling between Euclidean and Minkowski amplitudes is only possible for zero energy scattering observables and allows determining the scattering length from the Euclidean Bethe-Salpeter amplitude. Such a possibility strongly simplifies the numerical solution of the Bethe-Salpeter equation and suggests an alternative way to compute the scattering length in Lattice Euclidean calculations without using the Luscher formalism. The derivations contained in this work were performed for scalar particles and one-boson exchange kernel. They can be generalized to the fermion case and more involved interactions.

    ↳ hep-phhep-lathep-thnucl-thPLB(2016)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE