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Nuclear Theory·nucl-th

Tuesday·May 8, 2018

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 08

    The center of mass motion of short-range correlated nucleon pairs studied via the A(e,e'pp) reaction

    E.O. Cohen · O. Hen · E. Piasetzky · L.B. Weinstein · M. Duer · A. Schmidt · I. Korover · H. Hakobyan · the CLAS Collaboration

    Short-Range Correlated (SRC) nucleon pairs are a vital part of the nucleus, accounting for almost all nucleons with momentum greater than the Fermi momentum (kF). A fundamental characteristic of SRC pairs is having large relative momenta as compared to kF, and smaller center-of-mass (c.m.) which indicates a small separation distance between the nucleons in the pair. Determining the c.m. momentum distribution of SRC pairs is essential for understanding their formation process. We report here on the extraction of the c.m. motion of proton-proton (pp) SRC pairs in Carbon and, for the first time in heavier and ansymetric nuclei: aluminum, iron, and lead, from measurements of the A(e,e'pp) reaction. We find that the pair c.m. motion for these nuclei can be described by a three-dimensional Gaussian with a narrow width ranging from 140 to 170 MeV/c, approximately consistent with the sum of two mean-field nucleon momenta. Comparison with calculations appears to show that the SRC pairs are formed from mean-field nucleons in specific quantum states.

    ↳ nucl-exnucl-thPRL(2018)·70 citations
  2. 09

    Diffusion-model analysis of pPb and PbPb collisions at LHC energies

    P. Schulz🇩🇪 · G. Wolschin🇩🇪

    We present an analysis of centrality-dependent pseudorapidity distributions of produced charged hadrons in pPb and PbPb collisions at the LHC energy of sqrt{s_NN}=5.02 TeV, and of minimum-bias pPb collisions at 8.16 TeV within the nonequilibrium-statistical relativistic diffusion model (RDM). In a three-source approach, the role of the fragmentation sources is emphasized. Together with the Jacobian transformation from rapidity to pseudorapidity and the limiting fragmentation conjecture, these are essential for modeling the centrality dependence. For central PbPb collisions, a prediction at the projected FCC energy of sqrt{s_NN}=39 TeV is made.

    ↳ hep-phnucl-thMod.Phys.Lett.A(2018)·2 citations
  3. 10

    What is the right formalism to search for resonances? II. The pentaquark chain

    JPAC Collaboration: A. Pilloni🇺🇸 · J. Nys🇺🇸 · M. Mikhasenko🇩🇪 · M. Albaladejo🇪🇸 · C. Fernandez-Ramirez🇲🇽 · A. Jackura🇺🇸 · V. Mathieu🇺🇸 · N. Sherrill🇺🇸 · T. Skwarnicki🇺🇸 · A. P. Szczepaniak🇺🇸

    We discuss the differences between several partial-wave analysis formalisms used in the construction of three-body decay amplitudes involving fermions. Specifically, we consider the decay Lambda_b -> psi p K- , where the hidden charm pentaquark signal has been reported. We analyze the analytical properties of the amplitudes and separate kinematical and dynamical singularities. The result is an amplitude with the minimal energy dependence compatible with the S-matrix principles.

    ↳ hep-phhep-exnucl-thEPJC(2018)·16 citations
  4. 11

    Systematics of the HAL QCD Potential at Low Energies in Lattice QCD

    Takumi Iritani🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Shinya Gongyo🇯🇵 · Tetsuo Hatsuda🇯🇵 · Yoichi Ikeda🇯🇵 · Takashi Inoue🇯🇵 · Noriyoshi Ishii🇯🇵 · Hidekatsu Nemura🇯🇵 · Kenji Sasaki🇯🇵

    The interaction in the S channel is studied to examine the convergence of the derivative expansion of the non-local HAL QCD potential at the next-to-next-to-leading order (NLO). We find that (i) the leading order potential from the NLO analysis gives the scattering phase shifts accurately at low energies, (ii) the full NLO potential gives only small correction to the phase shifts even at higher energies below the inelastic threshold, and (iii) the potential determined from the wall quark source at the leading order analysis agrees with the one at the NLO analysis except at short distances, and thus, it gives correct phase shifts at low energies. We also study the possible systematic uncertainties in the HAL QCD potential such as the inelastic state contaminations and the finite volume artifact for the potential and find that they are well under control for this particular system.

    ↳ hep-lathep-phnucl-thPRD(2019)·70 citations

Affiliations

first authorsco-authorsvia INSPIRE