Nuclear Theory·nucl-th

Tuesday·January 30, 2018

11 papers—7 primary·4 cross-listed

08
[Submitted on 26 Jan 2018] (cross-list from hep-ph)
Toward Initial Conditions of Conserved Charges Part I: Spatial Correlations of Quarks and Antiquarks
M. Martinez🇺🇸 · Matthew D. Sievert🇺🇸 · Douglas E. Wertepny🇪🇸
In this paper, we study the spatial correlations among quarks and antiquarks produced at mid-rapidity by gluon pair production in the color glass condensate framework. This paper is the first part of a series in which we calculate a complete set of quark/quark, quark/antiquark, and antiquark/antiquark spatial correlation functions in heavy-light ion collisions, with the goal of incorporating their conserved charges into the initial conditions of hydrodynamics. The physical mechanisms captured in this calculation include geometric, entanglement, and interaction-mediated correlations. In this first paper, we construct the building blocks for the correlations arising from single- and double-pair production, studying in detail the single-pair case and the general features of the double-pair case. We find a rich correlation structure in transverse coordinate space, with different mechanisms dominating over different length scales, and we present explicit results for the quark-antiquark correlations in the single-pair production regime. We reserve a detailed discussion of the double-pair production regime for the next paper in this sequence.
Comments:
49 pages, 13 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.08986 [pdf]
JHEP(2018)·20 citations
09
[Submitted on 28 Jan 2018] (cross-list from hep-ph)
Universality of Generalized Parton Distributions in Light-Front Holographic QCD
Guy F. de Teramond🇨🇷 · Tianbo Liu🇺🇸 · Raza Sabbir Sufian🇺🇸 · Hans Gunter Dosch🇩🇪 · Stanley J. Brodsky🇺🇸 · Alexandre Deur (HLFHS Collaboration)🇺🇸
The structure of generalized parton distributions is determined from light-front holographic QCD up to a universal reparametrization function $w (x)$ which incorporates Regge behavior at small $x$ and inclusive counting rules at $x \to 1$ . A simple ansatz for $w (x)$ which fulfills these physics constraints with a single-parameter results in precise descriptions of both the nucleon and the pion quark distribution functions in comparison with global fits. The analytic structure of the amplitudes leads to a connection with the Veneziano model and hence to a nontrivial connection with Regge theory and the hadron spectrum.
Comments:
8 pages, 5 figures. Comparison extended to MMHT2014, CT14 in addition to NNPDF3.0 global fits. References added. Accepted for publication in PRL
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1801.09154 [pdf]
PRL(2018)·174 citations
10
[Submitted on 29 Jan 2018] (cross-list from hep-ph)
Proposal to look for the anomalous isotopic symmetry breaking in central diffractive production of the $f_{1} (1285)$ and $a_{0}^{0} (980)$ resonances at the LHC
N.N. Achasov🇷🇺 · G.N. Shestakov🇷🇺
At very high energies, and in the central region ( $x_{F} ≃ 0$ ), the double-Pomeron exchange mechanism gives the dominant contribution to the production of hadrons with the positive $C$ parity and isospin $I = 0$ . Therefore, the observation of resonances in the states with $I = 1$ will be indicative of their production or decay with the isotopic symmetry breaking. Here, we bear in mind the cases of the anomalous breaking of the isotopic symmetry, i.e., when the cross section of the process breaking the isospin is not of the order of $1 0^{- 4}$ of the cross section of the allowed process but of the order of $1%$ . The paper draws attention to the reactions $pp \to p (f_{1} (1285) / f_{1} (1420)) p \to p (π^{+} π^{-} π^{0}) p$ and $pp \to p (K K ˉ) p \to p (a_{0}^{0} (980)) p \to p (η π^{0}) p$ in which a similar situation can be realized, owing to the $K K ˉ$ loop mechanisms of the breaking of isotopic symmetry. We note that there is no visible background in the $π^{+} π^{-} π^{0}$ and $η π^{0}$ channels. Observation of the process $pp \to p (f_{1} (1285)) p \to p (π^{+} π^{-} π^{0}) p$ would be a confirmation of the first results from the VES and BESIII detectors, indicating the very large isospin breaking in the decay $f_{1} (1285)) \to π^{+} π^{-} π^{0}$ .
Comments:
5 pages, 4 figures; v2: title changed, comments and references added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
1801.09370 [pdf]
PRD(2018)·5 citations
11
[Submitted on 25 Jan 2018] (cross-list from astro-ph.HE)
Neutrinos, supernovae, and the origin of the heavy elements
Yong-Zhong Qian🇺🇸
Stars of ~8-100 solar masses end their lives as core-collapse supernovae (SNe). In the process they emit a powerful burst of neutrinos, produce a variety of elements, and leave behind either a neutron star or a black hole. The wide mass range for SN progenitors results in diverse neutrino signals, explosion energies, and nucleosynthesis products. A major mechanism to produce nuclei heavier than iron is rapid neutron capture, or the r process. This process may be connected to SNe in several ways. A brief review is presented on current understanding of neutrino emission, explosion, and nucleosynthesis of SNe.
Comments:
6 pages, 2 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.09554 [pdf]
SCPMA(2018)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

Toward Initial Conditions of Conserved Charges Part I: Spatial Correlations of Quarks and Antiquarks

Universality of Generalized Parton Distributions in Light-Front Holographic QCD

Proposal to look for the anomalous isotopic symmetry breaking in central diffractive production of the f1​(1285) and a00​(980) resonances at the LHC

Neutrinos, supernovae, and the origin of the heavy elements

Affiliations

Proposal to look for the anomalous isotopic symmetry breaking in central diffractive production of the $f_{1} (1285)$ and $a_{0}^{0} (980)$ resonances at the LHC