Nuclear Theory·nucl-th

Tuesday·October 20, 2020

17 papers—12 primary·5 cross-listed

13
Investigating Heavy-flavor vs Light-flavor Puzzle with Event Topology and Multiplicity in Proton+Proton Collisions at $s$ = 13 TeV using PYTHIA8
Suman Deb🇮🇳 · Raghunath Sahoo🇮🇳 · Dhananjaya Thakur🇨🇳 · Sushanta Tripathy🇲🇽 · Arvind Khuntia🇵🇱
Heavy-flavored hadrons are unique probes to study the properties of hot and dense QCD medium produced in ultra-relativistic heavy-ion collisions at RHIC and the LHC. Transverse spherocity is one of the event-topology variables used to separate jetty and isotropic events from the pool of event samples. This study aims to understand the production dynamics of heavy-flavors through the transverse momentum spectra, double differential yield and mean transverse momentum of J/ $ψ$ , $D^{0}$ and $Λ_{c}^{+}$ as a function of charged-particle multiplicity and transverse spherocity. Further to investigate the possibility of hardonization of the charm quarks, transverse spherocity dependence ratios like $Λ_{c}^{+}$ / $D^{0}$ and $Λ^{0}$ / $K^{-}$ are studied. For the current analysis, the events are generated by using 4C tuned PYTHIA8 for pp at $s$ = 13 TeV, which is quite successful in explaining the heavy-flavor particle production at the LHC energies.
↳ nucl-exhep-exhep-phhep-th+1J.Phys.G(2021)·8 citations
14
Advanced extraction of the deuteron charge radius from electron-deuteron scattering data
Jingyi Zhou🇺🇸 · Vladimir Khachatryan🇺🇸 · Haiyan Gao🇺🇸 · Douglas W. Higinbotham🇺🇸 · Asia Parker🇺🇸 · Xinzhan Bai🇺🇸 · Dipangkar Dutta🇺🇸 · Ashot Gasparian🇺🇸 · Kondo Gnanvo🇺🇸 · Mahbub Khandaker🇺🇸 · Nilanga Liyanage🇺🇸 · Eugene Pasyuk🇺🇸 · Chao Peng🇺🇸 · Weizhi Xiong🇺🇸
To extract the charge radius of the proton, $r_{p}$ , from the electron scattering data, the PRad collaboration at Jefferson Lab has developed a rigorous framework for finding the best functional forms - the fitters - for a robust extraction of $r_{p}$ from a wide variety of sample functions for the range and uncertainties of the PRad data. In this paper we utilize and further develop this framework. Herein we discuss methods for searching for the best fitter candidates as well as a procedure for testing the robustness of extraction of the deuteron charge radius, $r_{d}$ , from parametrizations based on elastic electron-deuteron scattering data. The ansatz proposed in this paper for the robust extraction of $r_{d}$ , for the proposed low- $Q^{2}$ DRad experiment at Jefferson Lab, can be further improved once there are more data.
↳ nucl-exhep-phnucl-thPRC(2021)·10 citations
15
Pulsar glitches from quantum vortex networks
Giacomo Marmorini🇯🇵 · Shigehiro Yasui🇯🇵 · Muneto Nitta🇯🇵
Neutron stars or pulsars are very rapidly rotating compact stars with extremely high density. One of the unsolved long-standing problems of these enigmatic celestial bodies is the origin of pulsars' glitches, i.e., the sudden rapid deceleration in the rotation speed of neutron stars. Although many glitch events have been reported, there is no consensus on the microscopic mechanism responsible for them. One of the important characterizations of the glitches is the scaling law $P (E) \sim E^{- α}$ of the probability distribution for a glitch with energy $E$ . Here, we reanalyse the accumulated up-to-date observation data to obtain the exponent $α \approx 0.88$ for the scaling law, and propose a simple microscopic model that naturally deduces this scaling law without any free parameters. Our model explains the appearance of these glitches in terms of the presence of quantum vortex networks arising at the interface of two different kinds of superfluids in the core of neutron stars; a $p$ -wave neutron superfluid in the inner core which interfaces with the $s$ -wave neutron superfluid in the outer core, where each integer vortex in the $s$ -wave superfluid connects to two half-quantized vortices in the $p$ -wave superfluid through structures called "boojums."
↳ astro-ph.HEhep-phnucl-thSci.Rep.(2024)·16 citations
16
On the Possibility of Dibaryon Formation near the N*(1440)N threshold -- the Isoscalar Single-Pion Production Revisited
H. Clement🇩🇪 · T. Skorodko🇩🇪 · E. Doroshkevich🇷🇺
The isoscalar single-pion production exhibits a broad bump in the energy dependence of the total cross section, which does not correspond to the usual opening of the $N^{*} (1440)$ production channel with subsequent pion decay. In arxiv:2102.05575 it was interpreted as a narrow Breit-Wigner structure, which leads in a sequential single-pion production process to a possible explanation of the $d^{*} (2380)$ resonance. We demonstrate that such an attempt fails already, when confronted with the data base for isoscalar single-pion production. We investigate whether the observed bump structure rather points to the formation of dibaryon states with $I (J^{P}) = 0 (1^{+})$ and $0 (1^{-})$ near the $N^{*} (1440) N$ threshold. This situation would be similar to the situation at the $Δ (1232) N$ threshold, where the signature of a number of dibaryonic resonances has been found.
↳ nucl-exhep-exhep-phnucl-thPRC(2022)·14 citations
17
The high energy spectrum of internal positrons from radiative muon capture on nuclei
Ryan Plestid🇺🇸 · Richard J. Hill🇺🇸
The Mu2e and COMET collaborations will search for nucleus-catalyzed muon conversion to positrons ( $μ^{-} \to e^{+}$ ) as a signal of lepton number violation. A key background for this search is radiative muon capture where either: 1) a real photon converts to an $e^{+} e^{-}$ pair "externally" in surrounding material, or 2) a virtual photon mediates the production of an $e^{+} e^{-}$ pair "internally". If the $e^{+}$ has an energy approaching the signal region then it can serve as an irreducible background. In this work we describe how the near end-point internal positron spectrum can be related to the real photon spectrum from the same nucleus, which encodes all non-trivial nuclear physics.
↳ hep-phhep-exnucl-thPRD(2021)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Investigating Heavy-flavor vs Light-flavor Puzzle with Event Topology and Multiplicity in Proton+Proton Collisions at s​ = 13 TeV using PYTHIA8

Advanced extraction of the deuteron charge radius from electron-deuteron scattering data

Pulsar glitches from quantum vortex networks

On the Possibility of Dibaryon Formation near the N*(1440)N threshold -- the Isoscalar Single-Pion Production Revisited

The high energy spectrum of internal positrons from radiative muon capture on nuclei

Affiliations

Investigating Heavy-flavor vs Light-flavor Puzzle with Event Topology and Multiplicity in Proton+Proton Collisions at $s$ = 13 TeV using PYTHIA8