Nuclear Theory·nucl-th

Tuesday·July 4, 2023

12 papers—6 primary·6 cross-listed

07
[Submitted on 30 Jun 2023] (cross-list from hep-ph)
Properties of the $T_{cc} (3875)^{+}$ and $T_{c ˉ c ˉ} (3875)^{-}$ (and their heavy-quark spin partners) in nuclear matter
Victor Montesinos🇪🇸 · Miguel Albaladejo🇪🇸 · Juan Nieves🇪🇸 · Laura Tolos🇪🇸
We discuss the modification of the properties of the tetraquark-like $T_{cc} (3875)^{+}$ and $T_{c ˉ c ˉ} (3875)^{-}$ states in dense nuclear matter. We consider the $T_{cc}^{+}$ and $T_{c ˉ c ˉ}^{-}$ in vacuum as purely isoscalar $D^{*} D$ and $D^{*} D$ $S$ -wave bound states, respectively, dynamically generated from a heavy-quark effective interaction between the charmed mesons. We compute the $D$ , $D$ , $D^{*}$ , and $D^{*}$ spectral functions embedded in a nuclear medium and use them to determine the corresponding $T_{cc}^{+}$ and $T_{c ˉ c ˉ}^{-}$ self energies and spectral functions. We find important modifications of the $D^{*} D$ and $D^{*} D$ scattering amplitudes and of the pole position of these exotic states already for $ρ_{0} /2$ , with $ρ_{0}$ the normal nuclear density. We also discuss the dependence of these results on the $D^{*} D$ ( $D^{*} D$ ) molecular component in the $T_{cc}^{+}$ ( $T_{c ˉ c ˉ}^{-}$ ) wave-function. Owing to the different nature of the $D^{(*)} N$ and $D^{(*)} N$ interactions, we find characteristic changes of the in-medium properties of the $T_{cc} (3875)^{+}$ and $T_{c ˉ c ˉ} (3875)^{-}$ , which become increasingly visible as the density increases. The experimental confirmation of the found distinctive density-pattern will give support to the molecular picture of these tetraquark-like states, since in the case they were colourless compact quark structures the density behaviour of their respective nuclear medium spectral functions would likely be similar. Finally, we perform similar analyses for the isoscalar $J^{P} = 1^{+}$ heavy-quark spin symmetry partners of the $T_{cc}^{+}$ ( $T_{cc}^{*+}$ ) and the $T_{c ˉ c ˉ}^{-}$ ( $T_{c ˉ c ˉ}^{*-}$ ) by considering the $D^{* 0} D^{*+}$ and $D^{* 0} D^{*-}$ scattering $T -$ matrices.
Comments:
17 pages, 9 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2306.17673 [pdf]
PRC(2023)·25 citations
08
[Submitted on 30 Jun 2023] (cross-list from quant-ph)
Simple Hamiltonian for Quantum Simulation of Strongly Coupled 2+1D SU(2) Lattice Gauge Theory on a Honeycomb Lattice
Berndt Müller🇺🇸 · Xiaojun Yao🇺🇸
We find a simple spin Hamiltonian to describe physical states of $2 + 1$ dimensional SU(2) lattice gauge theory on a honeycomb lattice with a truncation of the electric field representation at $j_{max} = \frac{1}{2}$ . The simple spin Hamiltonian only contains local products of Pauli matrices, even though Gauss's law has been completely integrated out.
Comments:
17 pages, 3 figures; v2: minor changes
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2307.00045 [pdf]
PRD(2023)·42 citations
09
[Submitted on 1 Jul 2023] (cross-list from hep-ph)
Dynamics of heavy flavour in a weakly magnetized hot QCD medium
Debarshi Dey🇮🇳 · Binoy krishna Patra🇮🇳
We obtain the spatial and momentum diffusion coefficients ( $D_{s}$ and $κ$ ), and the collisional energy loss ( $d E / d x$ ) of a heavy quark (HQ) traversing through a thermal medium of quarks and gluons in a weak magnetic field ( $B$ ), for the two cases of the HQ moving either parallel or perpendicular to $B$ . For that purpose, we consider Coulomb scatterings ( $t$ -channel) of the HQ with the light quarks, obtained from the imaginary part of the HQ self-energy via the cutting rules. Both the normalised (by $T^{3}$ ) %\textit{momentum} diffusion coefficients, $κ$ , as well as $d E / d x$ , for charm quarks are larger than that for bottom quarks due to the larger mass of the latter. Also, the effect of $B$ is more feeble on the bottom quark, compared to the charm quark. Comparatively, the magnitudes of both $κ$ and $d E / d x$ are significantly smaller for the case of $v ⊥ B$ . For both the cases, our results show that the momentum transfer between the HQ and the medium takes place preferentially along the direction of HQ velocity, thus leading to a significant increase in the momentum diffusion anisotropy, compared to $B = 0$ . We also calculate the (scaled) spatial diffusion coefficient, which we find to be independent of the heavy flavor mass and is almost unaffected by changes in $B$ .
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2307.00420 [pdf]
PRD(2024)·9 citations
10
[Submitted on 2 Jul 2023] (cross-list from hep-ph)
Neutral current neutrino and antineutrino scattering off the polarized nucleon
Krzysztof M. Graczyk🇵🇱 · Beata E. Kowal🇵🇱
The elastic and inelastic neutral current $ν$ ( $ν$ ) scattering off the polarized nucleon is discussed. The inelastic scattering concerns the single-pion production process. We show that the spin asymmetries' measurement can help to distinguish between neutrino and antineutrino neutral current scattering processes. The spin asymmetries also encode information about a type of target. Eventually, detailed studies of the inelastic spin asymmetries can improve understanding of the resonant-nonresonant pion production mechanism.
Comments:
10 pages, 5 figures, one table
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2307.00661 [pdf]
PRD(2023)·4 citations
11
[Submitted on 3 Jul 2023] (cross-list from hep-ph)
The Standard Model theory of neutron beta decay
Mikhail Gorchtein🇩🇪 · Chien-Yeah Seng🇺🇸
We review the status of the Standard Model theory of neutron beta decay. Particular emphasis is put on the recent developments in the electroweak radiative corrections. Given that some existing approaches give slightly different results, we thoroughly review the origin of discrepancies, and provide our recommended value for the radiative correction to the neutron and nuclear decay rates. The use of dispersion relation, lattice Quantum Chromodynamics and effective field theory framework allows for high-precision theory calculations at the level of $1 0^{- 4}$ , turning neutron beta decay into a powerful tool to search for new physics, complementary to high-energy collider experiments. We offer an outlook to the future improvements.
Comments:
Invited review article for Universe, Special Issue: Neutron lifetime 26 pages; Accepted version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2307.01145 [pdf]
Universe(2023)·26 citations
12
[Submitted on 3 Jul 2023] (cross-list from hep-ph)
Extraction of the strong coupling with HERA and EIC inclusive data
Salim Cerci🇹🇷 · Zuhal Seyma Demiroglu🇺🇸 · Abhay Deshpande🇺🇸 · Paul R. Newman🇬🇧 · Barak Schmookler🇺🇸 · Deniz Sunar Cerci🇹🇷 · Katarzyna Wichmann🇩🇪
Sensitivity to the strong coupling $α_{S} (M_{Z}^{2})$ is investigated using existing Deep Inelastic Scattering data from HERA in combination with projected future measurements from the Electron Ion Collider (EIC) in a next-to-next-to-leading order QCD analysis. A potentially world-leading level of precision is achievable when combining simulated inclusive neutral current EIC data with inclusive charged and neutral current measurements from HERA, with or without the addition of HERA inclusive jet and dijet data. The result can be obtained with substantially less than one year of projected EIC data at the lower end of the EIC centre-of-mass energy range. Some questions remain over the magnitude of uncertainties due to missing higher orders in the theoretical framework.
Comments:
12 pages, 4 figures
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:
2307.01183 [pdf]
EPJC(2023)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE

Properties of the Tcc​(3875)+ and Tcˉcˉ​(3875)− (and their heavy-quark spin partners) in nuclear matter

Simple Hamiltonian for Quantum Simulation of Strongly Coupled 2+1D SU(2) Lattice Gauge Theory on a Honeycomb Lattice

Dynamics of heavy flavour in a weakly magnetized hot QCD medium

Neutral current neutrino and antineutrino scattering off the polarized nucleon

The Standard Model theory of neutron beta decay

Extraction of the strong coupling with HERA and EIC inclusive data

Affiliations

Properties of the $T_{cc} (3875)^{+}$ and $T_{c ˉ c ˉ} (3875)^{-}$ (and their heavy-quark spin partners) in nuclear matter