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Nuclear Theory·nucl-th

Friday·September 25, 2015

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

    Yang-Ting Chien🇺🇸 · Ivan Vitev🇺🇸

    We calculate the jet shape and the jet cross section in heavy ion collisions using soft-collinear effective theory (SCET) and its extension with Glauber gluon interactions in the medium (SCET). We use the previously developed framework to systematically resum the jet shape at next-to-leading logarithmic accuracy, and we consistently include the medium modification by incorporating the leading order medium-induced splitting functions. The calculation provides, for the first time, a quantitative understanding of the jet shape modification measurement in lead-lead collisions at TeV at the LHC. The inclusive jet suppression is also calculated within the same framework beyond the traditional concept of parton energy loss, and the dependence on the centrality, the jet radius and the jet kinematics is examined. In the end we present predictions for the anticipated jet shape and cross section measurements in lead-lead collisions at TeV at the LHC.

    ↳ hep-phhep-exnucl-exnucl-thJHEP(2016)·150 citations
  2. 08

    Violations of discrete space-time symmetries in chiral effective field theory

    J. de Vries🇩🇪 · Ulf-G. Meißner🇩🇪

    We review recent progress in the theoretical description of the violation of discrete space-time symmetries in hadronic and nuclear systems. We focus on parity-violating and time-reversal-conserving interactions which are induced by the Standard Model weak interaction, and on parity- and time-reversal-violating interactions which can be caused by a nonzero QCD theta term or by beyond-the-Standard Model physics. We discuss the origins of such interactions and review the development of the chiral effective field theory extension that includes discrete symmetry violations. We discuss the construction of symmetry-violating chiral Lagrangians and nucleon-nucleon potentials and their applications in few-body systems.

    ↳ hep-phnucl-exnucl-thIJMPE(2016)·52 citations
  3. 09

    Quarkonium at finite temperature: Towards realistic phenomenology from first principles

    Yannis Burnier🇨🇭 · Olaf Kaczmarek🇩🇪 · Alexander Rothkopf🇩🇪

    We present the finite temperature spectra of both bottomonium and charmonium, obtained from a consistent lattice QCD based potential picture. Starting point is the complex in-medium potential extracted on full QCD lattices with dynamical u,d and s quarks, generated by the HotQCD collaboration. Using the generalized Gauss law approach, vetted in a previous study on quenched QCD, we fit with a single temperature dependent parameter , the Debye screening mass, and confirm the up to now tentative values of . The obtained analytic expression for the complex potential allows us to compute quarkonium spectral functions by solving an appropriate Schrödinger equation. These spectra exhibit thermal widths, which are free from the resolution artifacts that plague direct reconstructions from Euclidean correlators using Bayesian methods. In the present adiabatic setting, we find clear evidence for sequential melting and derive melting temperatures for the different bound states. Quarkonium is gradually weakened by both screening () and scattering () effects that in combination lead to a shift of their in-medium spectral features to smaller frequencies, contrary to the mass gain of elementary particles at finite temperature.

    ↳ hep-phhep-latnucl-thJHEP(2015)·137 citations
  4. 10

    Radiative energy loss and radiative p_T-broadening of high-energy partons in QCD matter

    Bin Wu🇫🇷

    I give a self-contained review on radiative p_T-broadening and radiative energy loss of high-energy partons in QCD matter. The typical p_T^2 of high-energy partons receives a double logarithmic correction due to the recoiling effect of medium-induced gluon radiation. Such a double logarithmic term, averaged over the path length of the partons, can be taken as the radiative correction to the jet quenching parameter qhat and hence contributes to radiative energy loss. This has also been confirmed by detailed calculations of energy loss by radiating two gluons.

    ↳ hep-phhep-exnucl-exnucl-thNucl.Part.Phys.Proc.(2016)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE