Perturbative width of open rigid strings Bakry, A. S.; Deliyergiyev, M. A.; Galal, A. A. ...
Physical review. D,
05/2022, Letnik:
105, Številka:
9
Journal Article
The potential and the density profile of the QCD flux-tube are investigated within the framework of the Luscher-Weisz (LW) string action with two boundary terms. The Numerical simulations involve 4D ...SU(3) Yang-Mills LGT at finite temperature. In general, we detect signatures of the two boundary terms considered in the LWstring action. Near the end of QCD Plateau, the LW string is yielding a static potential which is in a good agreement with the lattice data for source separations
R
≥ 0.3 fm. However, at
T/Tc
= 0.9, the fit to the potential data improves with a good fit attained at
R
≥ 0.7 fm. The mean-square width of the energy profile at
T/Tc
= 0.9 matches well the width of the LW string over distance scales
R
≥ 0.5 fm.
We investigate the implications of Nambu-Goto (NG), Lüscher Weisz (LW) and Polyakov-Kleinert (PK) effective string actions for the Casimir energy and the width of the quantum delocalization of the ...string in 4-dim pure SU(3) Yang-Mills lattice gauge theory. At a temperature closer to the critical point T/T
c
=0.9, we found that the next to leading-order (NLO) contributions from the expansion of the NG string in addition to the boundary terms in LW action to decrease the deviations from the lattice data in the intermediate distance scales for both the quark-antiquark
QQ̅
potential and broadening of the color tube compared to the free string approximation. We conjecture possible stiffness of the QCD string through studying the effects of extrinsic curvature term in PK action and find a good fitting behavior for the lattice Monte-Carlo data at both long and intermediate quark separations regions.
The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A ...hardening of the spectrum is observed at an energy of about 1.3 TeV, similar to previous observations. In addition, a spectral softening at about 34 TeV is revealed for the first time with large statistics and well controlled systematic uncertainties, with an overall significance of 4.3σ. The DAMPE spectral measurements of both cosmic protons and helium nuclei suggest a particle charge dependent softening energy, although with current uncertainties a dependence on the number of nucleons cannot be ruled out.
We explore the limit at which the effective baryonic Y-string model of the junction approaches the mesonic stringlike behavior. We calculate and compare the numerical values of the static potential ...and energy-density correlators of diquark-quark and quark-antiquark configurations. The gauge model is pure Yang-Mills \(SU(3)\) lattice gauge theory at coupling \(\beta=6.0\) and finite temperature. The diquark setup is approximated as two quarks confined within a sphere of radius \(0.1\) fm. The lattice data of the potential and energy show that the string binding the diquark-quark configuration displays an identical behavior to the quark-antiquark confining string. However, with the temperature increase to a small enough neighborhood of the critical point \(T_{c}\), the gluonic similarities between the two systems do not manifest neither at short nor intermediate distance scales \(R<1.0\) fm. The comparison between the potential and the second moment of the action-density correlators for both systems shows significant splitting. This suggests that subsisted baryonic decoupled states overlap with the mesonic spectrum. The baryonic junction's model for the potential and the profile returns a good fit to the numerical lattice data of the diquark-quark arrangement. However, near the critical point, the mesonic string displays large deviations compared to fits of the corresponding quark-antiquark data.
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