Nuclear Theory·nucl-th

Tuesday·August 14, 2018

13 papers—8 primary·5 cross-listed

09
[Submitted on 2 Aug 2018] (cross-list from hep-th)
M-Theory Exotic Scalar Glueball Decays to Mesons at Finite Coupling
Vikas Yadav🇮🇳 · Aalok Misra🇮🇳
Using the pull-back of the perturbed type IIA metric corresponding to the perturbation of arXiv:hep-th/1306.4339's M-theory uplift of arXiv:hep-th/0902.1540's UV-complete top-down type IIB holographic dual of large- $N$ thermal QCD, at finite coupling, we obtain the interaction Lagrangian corresponding to exotic scalar glueball( $G_{E}$ )- $ρ / π$ -meson interaction, linear in the exotic scalar glueball and up to quartic order in the $π$ mesons. In the Lagrangian, the coupling constants are determined as (radial integrals of) arXiv:hep-th/1306.4339's M-theory uplift's metric components and six radial functions appearing in the M-theory metric perturbations. Assuming $M_{G} > 2 M_{ρ}$ , we then compute $ρ \to 2 π, G_{E} \to 2 π, 2 ρ, ρ + 2 π$ decay widths as well as the direct and indirect (mediated via $ρ$ mesons) $G_{E} \to 4 π$ decays. For numerics, we choose $f 0 [1710]$ and compare with previous calculations. We emphasize that our results can be made to match PDG data (and improvements thereof) exactly by appropriate tuning of some constants of integration appearing in the solution of the M-theory metric perturbations and the $ρ$ and $π$ meson radial profile functions - a flexibility that our calculations permits.
Comments:
v3:49 pages, LaTeX, 2 Figures, accepted journal (JHEP) version
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1808.01182 [pdf]
JHEP(2018)·15 citations
10
[Submitted on 10 Aug 2018] (cross-list from hep-ph)
Novel tools and observables for jet physics in heavy-ion collisions
Harry Arthur Andrews🇬🇧 · Liliana Apolinario🇨🇭 · Redmer Alexander Bertens🇵🇹 · Christian Bierlich🇺🇸 · Matteo Cacciari🇸🇪 · Yi Chen🇫🇷 · Yang-Ting Chien🇨🇭 · Leticia Cunqueiro Mendez🇺🇸 · Michal Deak🇺🇸 · David d'Enterria🇵🇱 · Fabio Dominguez🇪🇸 · Philip Coleman Harris🇺🇸 and 16 other authors
Studies of fully-reconstructed jets in heavy-ion collisions aim at extracting thermodynamical and transport properties of hot and dense QCD matter. Recently, a plethora of new jet substructure observables have been theoretically and experimentally developed that provide novel precise insights on the modifications of the parton radiation pattern induced by a QCD medium. This report, summarizing the main lines of discussion at the 5th Heavy Ion Jet Workshop and CERN TH institute "Novel tools and observables for jet physics in heavy-ion collisions" in 2017, presents a first attempt at outlining a strategy for isolating and identifying the relevant physical processes that are responsible for the observed medium-induced jet modifications. These studies combine theory insights, based on the Lund parton splitting map, with sophisticated jet reconstruction techniques, including grooming and background subtraction algorithms.
Comments:
25 pages, report from the CERN TH institute "Novel tools and observables for jet physics in heavy-ion collisions", version accepted for publication in J. Phys. G
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1808.03689 [pdf]
J.Phys.G(2020)·133 citations
11
[Submitted on 10 Aug 2018] (cross-list from hep-ph)
Equation of state for QCD with a critical point from the 3D Ising Model
Paolo Parotto🇺🇸
Current knowledge of the finite-density QCD equation of state from first principles is limited to a Taylor expansion in the baryonic chemical potential around $μ_{B} = 0$ . By means of a scaling form for the equation of state of the 3D Ising model and a non-universal, parametrized map to QCD coordinates, we construct a family of equations of state matching state of the art first principle Lattice QCD calculations and including the correct critical behavior, which can be readily employed in hydrodynamical simulations of heavy ion collisions at finite density, covering most of the BES range at RHIC. This contribution reports on work done within the Fluctuations/Equation of State working group of the BEST Collaboration.
Comments:
3 pages, 1 figure, Quark Matter 2018 conference proceeding
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1808.03695 [pdf]
NPA(2019)·4 citations
12
[Submitted on 13 Aug 2018] (cross-list from hep-ph)
Strange matter and kaon to pion ratio in SU(3) PNJL model
A. V. Friesen🇷🇺 · Yu. L. Kalinovsky🇷🇺 · V. D. Toneev🇷🇺
The behavior of strange matter in the frame of the SU(3)Polyakov-loop extended Nambu-Jona-Lasinio model including $U_{A} (1)$ anomaly is considered. We discuss the appearance of a peak in the ratio of the number of strange mesons to non-strange mesons known as the "horn". The PNJL model gives a schematic description of the chiral phase transition and meson properties at finite temperature and density. Using the model, we can show that the splitting of kaon and anti-kaon masses appears as a result of introduction of density. This may explain the difference in the $K^{+} / π^{+}$ ratio and $K^{-} / π^{-}$ ratio at low $s_{N N}$ and their tendency to the same value at high $s_{N N}$ . We also show that the rise in the ratio $K^{+} / π^{+}$ appears near CEP when we build the $K^{+} / π^{+}$ ratio along the phase transition diagram and it can be considered as a critical region signal.
Comments:
7 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1808.04179 [pdf]
PRC(2019)·11 citations
13
[Submitted on 13 Aug 2018] (cross-list from hep-ph)
Lowest-order electron-electron and electron-muon scattering in a strong magnetic field
Abhishek Tiwari🇮🇳 · Binoy Krishna Patra🇮🇳
In this work we have investigated how the much studied scattering processes in vacuum at the lowest-order, {\em viz.} electron-muon ( $e$ - $μ$ ) scattering in both $s$ - and $t$ -channel, Bhabha scattering, and Møller scattering, have been modified in the presence of a strong magnetic field ( $∣ e B ∣ >> m^{2}$ , $m$ is the mass of electron or muon). For that purpose, we have first calculated the square of the matrix element by summing over the spin states, using the spinors in the presence of a strong magnetic field and then obtain the crosssection by integrating over the available phase space for the final states and averaging over the initial states. The first noticeable observation in the spin-summed of the matrix element squared is that the interference term between $s$ - and $t$ -channel and $t$ - and $u$ -channel in Bhabha and Møller scattering, respectively are missing in the presence of strong magnetic field. We have found that in the presence of strong magnetic field, the crosssection of $e^{-} e^{+} \to μ^{-} μ^{+}$ annihilation process in the lowest order decreases inversely proportional to the fourth power of the center-of-mass energy ( $s$ ), compared to the inversely proportional to the square of center-of-mass energy in vacuum alone. Like in vacuum, the crosssection for $e$ - $μ$ scattering in $t$ channel, {\em i.e.} for $e^{-} μ^{-} \to e^{-} μ^{-}$ process, even in a strong magnetic field too diverges but the finite part decreases with $s$ much faster than in vacuum alone. Similarly the crosssections for both Bhabha and Møller scattering at the lowest-order diverges in the infrared limit. However, the finite term decreases with $s$ much faster than the vacuum alone. In addition there is finite negative contribution, which is independent of $s$ and decreases with the magnetic field.
Comments:
41 pages with 10 figures/diagrams
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1808.04236 [pdf]
6 citations

Affiliations

first authorsco-authorsvia INSPIRE

M-Theory Exotic Scalar Glueball Decays to Mesons at Finite Coupling

Novel tools and observables for jet physics in heavy-ion collisions

Equation of state for QCD with a critical point from the 3D Ising Model

Strange matter and kaon to pion ratio in SU(3) PNJL model

Lowest-order electron-electron and electron-muon scattering in a strong magnetic field

Affiliations