Nuclear Theory·nucl-th

Wednesday·August 16, 2017

8 papers—5 primary·3 cross-listed

06
Anomalous thermoelectric phenomena in lattice models of multi-Weyl semimetals
E. V. Gorbar · V. A. Miransky · I. A. Shovkovy · P. O. Sukhachov
The thermoelectric transport coefficients are calculated in a generic lattice model of multi-Weyl semimetals with a broken time-reversal symmetry by using the Kubo's linear response theory. The contributions connected with the Berry curvature-induced electromagnetic orbital and heat magnetizations are systematically taken into account. It is shown that the thermoelectric transport is profoundly affected by the nontrivial topology of multi-Weyl semimetals. In particular, the calculation reveals a number of thermal coefficients of the topological origin which describe the anomalous Nernst and thermal Hall effects in the absence of background magnetic fields. Similarly to the anomalous Hall effect, all anomalous thermoelectric coefficients are proportional to the integer topological charge of the Weyl nodes. The dependence of the thermoelectric coefficients on the chemical potential and temperature is also studied.
↳ cond-mat.mes-hallnucl-thPRB(2017)·34 citations
07
The Role of QCD Monopoles in Jet Quenching
Adith Ramamurti🇺🇸 · Edward Shuryak🇺🇸
QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein condensation (BEC) at $T < T_{c}$ creates electric confinement and flux tubes. The "magnetic scenario" of QCD proposes that scattering on the non-condensed component of the monopole ensemble at $T > T_{c}$ is responsible for the unusual kinetic properties of QGP. In this paper, we study the contribution of the monopoles to jet quenching phenomenon, using the BDMPS framework and hydrodynamic backgrounds. In the lowest order for cross sections, we calculate the nuclear modification factor, $R_{AA},$ and azimuthal anisotropy, $v_{2}$ , of jets, as well as the dijet asymmetry, $A_{j}$ , and compare those to the available data. We find relatively good agreement with experiment when using realistic hydrodynamic backgrounds. In addition, we find that event-by-event fluctuations are not necessary to reproduce $R_{AA}$ and $v_{2}$ data, but play a role in $A_{j}$ . Since the monopole-induced effects are maximal at $T \approx T_{c}$ , we predict that their role should be significantly larger, relative to quarks and gluons, at lower RHIC energies.
↳ hep-phnucl-thPRD(2018)·14 citations
08
Mass spectra and radiative transitions of doubly heavy baryons in a relativized quark model
Qi-Fang Lü🇨🇳 · Kai-Lei Wang🇨🇳 · Li-Ye Xiao🇨🇳 · Xian-Hui Zhong🇨🇳
We study the mass spectra and radiative decays of doubly heavy baryons within the diquark picture in a relativized quark model. The mass of the $J^{P} = 1/ 2^{+}$ $Ξ_{cc}$ ground state is predicted to be 3606 MeV, which is consistent with the mass of $Ξ_{cc}^{++} (3621)$ newly observed by the LHCb collaboration. The predicted mass gap between two $S$ wave states, $Ξ_{cc}^{*}$ ( $J^{P} = 3/ 2^{+}$ ) and $Ξ_{cc}$ ( $J^{P} = 1/ 2^{+}$ ), is 69 MeV. Furthermore, the radiative transitions of doubly heavy baryons are also estimated by using the realistic wave functions obtained from relativized quark model. The radiative decay widths of $Ξ_{cc}^{*++} \to Ξ_{cc}^{++} γ$ and $Ξ_{cc}^{*+} \to Ξ_{cc}^{+} γ$ are predicted to be about 7 and 4 keV, respectively. These predictions of doubly heavy baryons can provide helpful information for future experimental searches.
↳ hep-phhep-exnucl-thPRD(2017)·119 citations

Affiliations

first authorsco-authorsvia INSPIRE

Anomalous thermoelectric phenomena in lattice models of multi-Weyl semimetals

The Role of QCD Monopoles in Jet Quenching

Mass spectra and radiative transitions of doubly heavy baryons in a relativized quark model

Affiliations