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Nuclear Theory·nucl-th

Thursday·March 19, 2015

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    Collective flow in high-multiplicity proton-proton collisions

    Tigran Kalaydzhyan🇺🇸 · Edward Shuryak🇺🇸

    We present an evidence of strong radial flow in high-multiplicity pp collisions. We analyze the CMS data on the inclusive spectra of the charged pions, kaons and protons in the LHC TeV collisions. For we demonstrate the consistency of the hydrodynamic description with the (idealized) Gubser's flow. Using a one parameter fit of the model to experimental data, we obtain the initial fireball size to be of the order of 1 fm. At smaller multiplicities, the fit cannot be performed which shows a limitation of the hydrodynamic approach and provides us with falsifiability of our theory.

    ↳ hep-phhep-thnucl-thPRC(2015)·35 citations
  2. 04

    The electron screening puzzle and nuclear clustering

    C. Spitaleri · C.A. Bertulani · L. Fortunato · A. Vitturi

    Accurate measurements of nuclear reactions of astrophysical interest within, or close to, the Gamow peak, show evidence of an unexpected effect attributed to the presence of atomic electrons in the target. The experiments need to include an effective "screening" potential to explain the enhancement of the cross sections at the lowest measurable energies. Despite various theoretical studies conducted over the past 20 years and numerous experimental measurements, a theory has not yet been found that can explain the cause of the exceedingly high values of the screening potential needed to explain the data. In this letter we show that instead of an atomic physics solution of the "electron screening puzzle", the reason for the large screening potential values is in fact due to clusterization effects in nuclear reactions, in particular for reaction involving light nuclei.

    ↳ nucl-exastro-ph.COastro-ph.SRnucl-thPLB(2016)·49 citations
  3. 05

    Lattice worldline representation of correlators in a background field

    Thomas Epelbaum🇨🇦 · Francois Gelis🇫🇷 · Bin Wu🇫🇷

    We use a discrete worldline representation in order to study the continuum limit of the one-loop expectation value of dimension two and four local operators in a background field. We illustrate this technique in the case of a scalar field coupled to a non-Abelian background gauge field. The first two coefficients of the expansion in powers of the lattice spacing can be expressed as sums over random walks on a d-dimensional cubic lattice. Using combinatorial identities for the distribution of the areas of closed random walks on a lattice, these coefficients can be turned into simple integrals. Our results are valid for an anisotropic lattice, with arbitrary lattice spacings in each direction.

    ↳ hep-phhep-thnucl-thJHEP(2015)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE