Nuclear Theory·nucl-th

Wednesday·August 24, 2022

12 papers—7 primary·5 cross-listed

08
[Submitted on 21 Aug 2022] (cross-list from hep-ph)
On the question of quark confinement in the Abelian U(1) QED gauge interaction
Cheuk-Yin Wong🇺🇸
If we approximate light quarks as massless and apply the Schwinger confinement mechanism to light quarks, we will reach the conclusion that a light quark $q$ and its antiquark $q ˉ$ will be confined as a $q q ˉ$ boson in the Abelian U(1) QED gauge interaction in (1+1)D, as in an open string. From the work of Coleman, Jackiw, and Susskind, we can infer further that the Schwinger confinement mechanism persists even for massive quarks in (1+1)D. Could such a QED-confined $q q ˉ$ one-dimensional open string in (1+1)D be the idealization of a flux tube in the physical world in (3+1)D, similar to the case of QCD-confined $q q ˉ$ open string? If so, the QED-confined $q q ˉ$ bosons may show up as neutral QED mesons in the mass region of many tens of MeV (PRC81(2010)064903 & JHEP2020(8)165). Is it ever possible that a quark and an antiquark be produced and interact in QED alone to form a confined QED meson? Is there any experimental evidence for the existence of a QED meson (or QED mesons)? The observations of the anomalous soft photons, the X17 particle, and the E38 particle suggest that they may bear the experimental evidence for the existence of such QED mesons. Further confirmation and investigations on the X17 and E38 particles will shed definitive light on the question of quark confinement in QED in (3+1)D. Implications of quark confinement in the QED interaction are discussed.
Comments:
70 pages, 16 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2208.09920 [pdf]
Front.Phys.(Beijing)(2023)·5 citations
09
[Submitted on 22 Aug 2022] (cross-list from hep-th)
Determining all thermodynamic transport coefficients for an interacting large N quantum field theory
Max Weiner🇺🇸 · Paul Romatschke🇺🇸
Thermodynamic transport coefficients can be calculated directly from quantum field theory without requiring analytic continuation to real time. We determine all second-order thermodynamic transport coefficients for the uncharged N-component massless (critical) scalar field theory with quartic interaction in the large N limit, for any value of the coupling. We find that in the large N limit, all thermodynamic transport coefficients for the interacting theory can be expressed analytically in terms of the in-medium mass and sums over modified Bessel functions. We expect our technique to allow a similar determination of all thermodynamic transport coefficients for all theories that are solvable in the large N limit, including certain gauge theories.
Comments:
19 pages, 3 figures
Subjects:
High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2208.10502 [pdf]
JHEP(2023)·11 citations
10
[Submitted on 22 Aug 2022] (cross-list from hep-lat)
Three-body scattering and quantization conditions from $S$ matrix unitarity
Andrew W. Jackura🇺🇸
Two methodologies have been presented in the literature which connect relativistic three-particle scattering amplitudes with lattice QCD spectra -- the ``relativistic effective field theory'' approach and the ``finite-volume unitarity'' method. While both methods have been shown to be equivalent in various works, it has not been shown how to arrive at the relativistic effective field theory results directly from $S$ matrix unitarity. In this work, we provide a simple proof of the relativistic effective field theory form of the scattering equations directly from unitarity. Motivated by the finite-volume unitarity approach, we then postulate a set of quantization conditions which relate the finite-volume energy spectra to the $K$ matrices which drive the short-distance physics in the scattering equations, obtaining all previously known results for three identical particles. This work also presents new relations which provide a new pathway to generalize the results to arbitrary systems.
Comments:
34 pages, 8 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2208.10587 [pdf]
PRD(2023)·34 citations
11
[Submitted on 23 Aug 2022] (cross-list from hep-ph)
$P_{cc}^{N}$ states in a unitarized coupled-channel approach
Chao-Wei Shen🇩🇪 · Yong-hui Lin🇩🇪 · Ulf-G. Meißner🇩🇪
Starting from an effective Lagrangian with heavy quark spin symmetry embedded, the coupled-channel dynamics of the doubly charmed systems $D^{(*)} Σ_{c}^{(*)}$ is investigated. The potential underlying our investigation includes $t$ -channel pseudoscalar and vector meson exchanges. A series of $S$ -wave bound states with isospin $I = 1/2$ is found by applying the first iterated solution of the $N / D$ method: one state with binding energy $23$ MeV in the $5/ 2^{-}$ $D^{*} Σ_{c}^{*}$ channel, three states with binding energy $26$ , $30$ and $7$ MeV (relative to the thresholds from low to high, respectively) in the $3/ 2^{-}$ $D Σ_{c}^{*}$ - $D^{*} Σ_{c}$ - $D^{*} Σ_{c}^{*}$ system and three states with binding energy $32$ , $8$ and $16$ MeV in the $1/ 2^{-}$ $D Σ_{c}$ - $D^{*} Σ_{c}$ - $D^{*} Σ_{c}^{*}$ system. Those $P_{cc}^{N}$ states serve as the open-charm partners of the hidden charm pentaquarks $P_{ψ}^{N}$ observed by the LHCb Collaboration.
Comments:
9 pages, 6 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2208.10865 [pdf]
EPJC(2023)·16 citations
12
[Submitted on 23 Aug 2022] (cross-list from hep-ph)
Multiplicity, transverse momentum and pseudorapidity dependence of open-heavy flavored hadron production in proton+proton collisions at $s$ = 13 TeV using PYTHIA8
Bhagyarathi Sahoo🇮🇳 · Suman Deb🇮🇳 · Raghunath Sahoo🇮🇳
Recently, with the upgradation of LHC, it is realized that study of heavy-flavored hadrons, namely $Λ_{c}^{+}$ and $D^{0}$ in hadronic collisions, could reveal the possibility of thermalization of charm quarks. With this motivation, we study the production dynamics of these hadrons using a pQCD-inspired Monte Carlo event generator called PYTHIA8 in proton+proton collisions at $s$ = 13 TeV. The production dynamics of these hadrons are analyzed through charged-particle multiplicity, transverse momentum, and pseudorapidity. With the help of the established PYTHIA8 tunes to mimic the behavior of flow-like features, we investigated the variation of effective temperature and degree of non-extensivity using thermodynamically consistent non-extensive Tsallis statistics. We further attempted to establish a connection between the initial state and final state by estimating the correlation between the number of multi-partonic interactions ( $n_{MPI}$ ) with the Knudsen number.
Comments:
13 pages and 6 captioned figures. Same as the published version in IJMPE
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2208.10901 [pdf]
IJMPE(2024)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

On the question of quark confinement in the Abelian U(1) QED gauge interaction

Determining all thermodynamic transport coefficients for an interacting large N quantum field theory

Three-body scattering and quantization conditions from S matrix unitarity

PccN​ states in a unitarized coupled-channel approach

Multiplicity, transverse momentum and pseudorapidity dependence of open-heavy flavored hadron production in proton+proton collisions at s​= 13 TeV using PYTHIA8

Affiliations

Three-body scattering and quantization conditions from $S$ matrix unitarity

$P_{cc}^{N}$ states in a unitarized coupled-channel approach

Multiplicity, transverse momentum and pseudorapidity dependence of open-heavy flavored hadron production in proton+proton collisions at $s$ = 13 TeV using PYTHIA8