Nuclear Theory·nucl-th

Tuesday·January 9, 2018

17 papers—12 primary·5 cross-listed

13
[Submitted on 2 Jan 2018] (cross-list from hep-ph)
On the clustering properties of produced particles in high-energy $pp$ collisions
Cheuk-Yin Wong🇺🇸 · Hanpu Jiang🇺🇸 · Nanxi Yao🇺🇸 · Liwen Wen🇺🇸 · Gang Wang🇺🇸 · Huan Zhong Huang🇺🇸
Minijets provide useful information on parton interactions in the low transverse-momentum (low- $p_{T}$ ) region. Because minijets produce clusters, we study the clustering properties of produced particles in high-energy $pp$ collisions as a first step to identify minijets. We develop an algorithm to find clusters by using the k-means clustering method, in conjunction with a k-number (cluster number) selection principle in the space of pseudorapidity and azimuthal angles. We test the clustering algorithm using events generated by PYTHIA 8.1, for $pp$ collision at $s = 200$ GeV. We find that clustering of low- $p_{T}$ hadrons occurs in high multiplicity events. However similar clustering properties are also present for particles produced randomly in a finite pseudorapidity and azimuthal angle space. To distinguish the dynamics from random generations of events, it is necessary to examine the correlation between particles and between clusters. We find that the correlations between clusters may provide a useful tool to distinguish the underlying dynamics of the reaction mechanism.
Comments:
22 pages, 21 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1801.00759 [pdf]
PRD(2020)·4 citations
14
[Submitted on 3 Jan 2018] (cross-list from astro-ph.SR)
The formation of the heaviest elements
Anna Frebel (MIT) · Timothy C. Beers (Notre Dame)
The rapid neutron-capture process needed to build up many of the elements heavier than iron seems to take place primarily in neutron-star mergers, not supernova explosions.
Comments:
This version removed by arXiv administrators for inappropriate format
Subjects:
Solar and Stellar Astrophysics (astro-ph.SR); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1801.01190 [pdf]
Phys.Today·9 citations
15
[Submitted on 7 Jan 2018] (cross-list from hep-ph)
Properties of $Σ_{Q}^{*}$ , $Ξ_{Q}^{*}$ and $Ω_{Q}^{*}$ heavy baryons in cold nuclear matter
K. Azizi🇮🇷 · N. Er🇹🇷
The in-medium properties of the heavy spin-3/2 $Σ_{Q}^{*}$ , $Ξ_{Q}^{*}$ and $Ω_{Q}^{*}$ baryons with $Q$ being $b$ or $c$ quark are investigated. The shifts in some spectroscopic parameters of these particles due to the saturated cold nuclear matter are calculated. The variations of those parameters with respect to the changes in the density of the cold nuclear medium are studied, as well. It is observed that the parameters of $Σ_{Q}^{*}$ baryons are considerably affected by the nuclear matter compared to the $Ξ_{Q}^{*}$ and $Ω_{Q}^{*}$ particles that roughly do not see the medium. The results obtained may be used in analyses of the data to be provided by the in-medium experiments like PANDA.
Comments:
13 Pages, 10 Figures and 3 Tables. Some typos have been corrected
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1801.02168 [pdf]
NPA(2018)·12 citations
16
[Submitted on 7 Jan 2018] (cross-list from hep-ph)
$η$ and $η^{'}$ photoproduction with EtaMAID including Regge phenomenology
V.L. Kashevarov🇩🇪 · L. Tiator🇩🇪 · M. Ostrick🇩🇪
We present a new version of the EtaMAID model for $η$ and $η^{'}$ photoproduction on nucleons. The model includes 23 nucleon resonances parameterized with Breit-Wigner shapes. The background is described by vector and axial-vector meson exchanges in the $t$ channel using the Regge cut phenomenology. Parameters of the resonances were obtained from a fit to available experimental data for $η$ and $η^{'}$ photoproduction on protons and neutrons. The nature of the most interesting observations in the data is discussed.
Comments:
5 pages, 5 figures, talk presented at the Mini-Workshop "Advances in Hadronic Resonances", Bled, Slovenia, July 2-9, 2017
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1801.02196 [pdf]
Bled Workshops Phys.(2017)·1 citation
17
[Submitted on 8 Jan 2018] (cross-list from cond-mat.quant-gas)
Interatomic interaction effects on second-order momentum correlations and Hong-Ou-Mandel interference of double-well-trapped ultracold fermionic atoms
Benedikt B. Brandt · Constantine Yannouleas · Uzi Landman
Identification and understanding of the evolution of interference patterns in two-particle momentum correlations as a function of the strength of interatomic interactions are important in explorations of the nature of quantum states of trapped particles. Together with the analysis of two-particle spatial correlations, they offer the prospect of uncovering fundamental symmetries and structure of correlated many-body states, as well as opening vistas into potential control and utilization of correlated quantum states as quantum information resources. With the use of the second-order density matrix constructed via exact diagonalization of the microscopic Hamiltonian, and an analytic Hubbard-type model, we explore here the systematic evolution of characteristic interference patterns in the two-body momentum and spatial correlation maps of two entangled ultracold fermionic atoms in a double well, for the entire attractive- and repulsive-interaction range. We uncover statistics-governed bunching and antibunching, as well as interaction-dependent interference patterns, in the ground and excited states, and interpret our results in light of the Hong-Ou-Mandel interference physics, widely exploited in photon indistinguishability testing and quantum information science.
Comments:
18 pages, 8 color figures. A new section V was added; it describes entanglement aspects and the connection to the Hong-Ou-Mandel interference physics. Also the whole range for both repulsive and attractive interparticle interaction is now investigated. For related papers, see http://www.prism.gatech.edu/~ph274cy/
Subjects:
Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
1801.02295 [pdf]
PRA(2018)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE

On the clustering properties of produced particles in high-energy pp collisions

The formation of the heaviest elements

Properties of ΣQ∗​, ΞQ∗​ and ΩQ∗​ heavy baryons in cold nuclear matter

η and η′ photoproduction with EtaMAID including Regge phenomenology

Interatomic interaction effects on second-order momentum correlations and Hong-Ou-Mandel interference of double-well-trapped ultracold fermionic atoms

Affiliations

On the clustering properties of produced particles in high-energy $pp$ collisions

Properties of $Σ_{Q}^{}$ , $Ξ_{Q}^{}$ and $Ω_{Q}^{*}$ heavy baryons in cold nuclear matter

$η$ and $η^{'}$ photoproduction with EtaMAID including Regge phenomenology