Nuclear Theory·nucl-th

Wednesday·March 8, 2017

10 papers—3 primary·7 cross-listed

01
[Submitted on 6 Mar 2017]
Coherent Hypernucleus Production in Antiproton-Nucleus Annihilation Reactions as a Probe for $κ$ meson Exchange
A.B. Larionov🇩🇪 · H. Lenske🇩🇪
The hypernucleus production reaction $p ˉ +^{A} Z \to_{Λ}^{A} (Z - 1) + Λ ˉ$ in the beam momentum range 1.5-20 GeV/c is addressed theoretically as a coherent process. The calculations are based on a covariant $t$ -channel meson exchange model for the elementary $p ˉ p \to Λ ˉ Λ$ annihilation amplitude with parameters fixed by comparison with empirical data. Besides pseudo-scalar $K$ and vector $K^{*}$ mesons we also account for correlated $π K$ contributions, modelled by the scalar $K_{0}^{*} (800)$ or $κ$ meson. Initial and final state nuclear interactions are taken into account in eikonal approximation. The bound baryon wave functions are obtained self-consistently in a covariant mean-field approach. It is shown that the hypernucleus production cross sections populating discrete states are dominated by the vector and scalar interaction channels. The pronounced sensitivity on the scalar $κ$ meson exchange contributions indicates that these reactions are well suited as a probe for correlated $π K$ exchange in the scalar $κ / K_{0}^{*}$ interaction channel.
Comments:
21 pages, 8 figures, added references, extended conclusion section
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1703.02073 [pdf]
0 citations
02
[Submitted on 7 Mar 2017]
"Mass Without Mass" and Nuclear Matter
Mannque Rho🇫🇷
This is a brief account of the chief accomplishment of the 5-year activity (2008-2013) in the World Class University III Program at Hanyang University with the theme of exploring "From Dense Matter to Compact Stars." The principal objective was to explore and foresee what could be a break-through research that could be initiated at the RIB machine in project "RAON" at the upcoming ambitious Institute for Basic Science (IBS) in Korea. What came out was a possibility for unraveling the mystery of proton's "mass without mass" via nuclear matter and its impact on RAON-type physics and compact stars.
Comments:
5 pages no figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1703.02277 [pdf]
1 citation
03
[Submitted on 6 Mar 2017]
Transverse Momentum Spectra and Nuclear Modification Factor using Boltzmann Transport Equation with Flow in Pb+Pb collisions at $s_{N N}$ = 2.76 TeV
Sushanta Tripathy🇮🇳 · Arvind Khuntia🇮🇳 · Swatantra Kumar Tiwari🇮🇳 · Raghunath Sahoo🇮🇳
In the continuation of our previous work, the transverse momentum ( $p_{T}$ ) spectra and nuclear modification factor ( $R_{AA}$ ) are derived using relaxation time approximation of Boltzmann Transport Equation (BTE). The initial $p_{T}$ -distribution used to describe $p + p$ collisions has been studied with the pQCD inspired power-law distribution, the Hagedorn's empirical formula and with the Tsallis non-extensive statistical distribution. The non-extensive Tsallis distribution is observed to describe the complete range of the transverse momentum spectra. The Boltzmann-Gibbs Blast Wave (BGBW) distribution is used as the equilibrium distribution in the present formalism, to describe the $p_{T}$ -distribution and nuclear modification factor in nucleus-nucleus collisions. The experimental data for Pb+Pb collisions at $s_{N N}$ = 2.76 TeV at the Large Hadron Collider at CERN have been analyzed for pions, kaons, protons, $K^{* 0}$ and $ϕ$ . It is observed that the present formalism while explaining the transverse momentum spectra upto 5 GeV/c, explains the nuclear modification factor very well upto 8 GeV/c in $p_{T}$ for all these particles except for protons. $R_{AA}$ is found to be independent of the degree of non-extensivity, $q_{pp}$ after $p_{T} \sim$ 8 GeV/c.
Comments:
Same as published version in EPJA
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1703.02416 [pdf]
EPJA(2017)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE

Coherent Hypernucleus Production in Antiproton-Nucleus Annihilation Reactions as a Probe for κ meson Exchange

"Mass Without Mass" and Nuclear Matter

Transverse Momentum Spectra and Nuclear Modification Factor using Boltzmann Transport Equation with Flow in Pb+Pb collisions at sNN​​ = 2.76 TeV

Affiliations

Coherent Hypernucleus Production in Antiproton-Nucleus Annihilation Reactions as a Probe for $κ$ meson Exchange

Transverse Momentum Spectra and Nuclear Modification Factor using Boltzmann Transport Equation with Flow in Pb+Pb collisions at $s_{N N}$ = 2.76 TeV