Nuclear Theory·nucl-th

Wednesday·October 12, 2022

7 papers—2 primary·5 cross-listed

03
State Preparation in the Heisenberg Model through Adiabatic Spiraling
Anthony N. Ciavarella🇺🇸 · Stephan Caspar🇺🇸 · Marc Illa🇺🇸 · Martin J. Savage🇺🇸
An adiabatic state preparation technique, called the adiabatic spiral, is proposed for the Heisenberg model. This technique is suitable for implementation on a number of quantum simulation platforms such as Rydberg atoms, trapped ions, or superconducting qubits. Classical simulations of small systems suggest that it can be successfully implemented in the near future. A comparison to Trotterized time evolution is performed and it is shown that the adiabatic spiral is able to outperform Trotterized adiabatics.
↳ quant-phcond-mat.quant-gashep-latnucl-thQuantum(2023)·17 citations
04
Photoproduction of $e^{+} e^{-}$ in peripheral isobar collisions
Shuo Lin🇨🇳 · Ren-Jie Wang🇨🇳 · JIan-Fei Wang🇨🇳 · Hao-Jie Xu🇨🇳 · Shi Pu🇨🇳 · Qun Wang🇨🇳
We investigate the photoproduction of di-electrons in peripheral collisions of $_{44}^{96} Ru +_{44}^{96} Ru$ and $_{40}^{96} Zr +_{40}^{96} Zr$ at 200 GeV. With the charge and mass density distributions given by the calculation of the density functional theory, we calculate the spectra of transverse momentum, invariant mass and azimuthal angle for di-electrons at 40-80\% centrality. The ratios of these spectra in Ru+Ru collisions over to Zr+Zr collisions are shown to be smaller than $(44/40)^{4}$ (the ratio of $Z^{4}$ for Ru and Zr) at low transverse momentum. The deviation arises from the different mass and charge density distributions in Ru and Zr. So the photoproduction of di-leptons in isobar collisions may provide a new way to probe the nuclear structure.
↳ hep-phnucl-thPRD(2023)·18 citations
05
Stronger $C$ -odd color charge correlations in the proton at higher energy
Adrian Dumitru🇺🇸 · Heikki Mäntysaari🇫🇮 · Risto Paatelainen🇫🇮
The non-forward eikonal scattering matrix for dipole-proton scattering at high energy obtains an imaginary part due to a $C$ -odd three gluon exchange. We present numerical estimates for the perturbative Odderon amplitude as a function of dipole size, impact parameter, their relative azimuthal angle, and light-cone momentum cutoff $x$ . The proton is approximated as $ψ_{qqq} ∣ q q q ⟩ + ψ_{qqqg} ∣ q q q g ⟩$ , where $ψ_{qqq}$ is a non-perturbative three quark model wave function while the gluon emission is computed in light-cone perturbation theory. We find that the Odderon amplitude increases as $x$ decreases from 0.1 to 0.01. At yet lower $x$ , the reversal of this energy dependence would reflect the onset of universal small- $x$ renormalization group evolution.
↳ hep-phnucl-thPRD(2023)·12 citations
06
Lattice QCD studies on decuplet baryons as meson-baryon bound states in the HAL QCD method
Kotaro Murakami🇯🇵 · Yutaro Akahoshi🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Kenji Sasaki🇯🇵
We study decuplet baryons from meson-baryon interactions in lattice QCD, in particular, $Δ$ and $Ω$ baryons from P-wave $I = 3/2$ $N π$ and $I = 0$ $Ξ K ˉ$ interactions, respectively. Interaction potentials are calculated in the HAL QCD method using 3-quark-type source operators at $m_{π} \approx 410 MeV$ and $m_{K} \approx 635 MeV$ , where $Δ$ as well as $Ω$ baryons are stable. We use the conventional stochastic estimate of all-to-all propagators combined with the all-mode averaging to reduce statistical fluctuations. We have found that the $Ξ K ˉ$ system has a weaker attraction than the $N π$ system while the binding energy from the threshold is larger for $Ω$ than $Δ$ . This suggests that an inequality $m_{N} + m_{π} - m_{Δ} < m_{Ξ} + m_{K ˉ} - m_{Ω}$ comes mainly from a smaller spatial size of a $Ξ K ˉ$ bound state due to a larger reduced mass, rather than its interaction. Root-mean-square distances of bound states in both systems are small, indicating that $Δ$ and $Ω$ are tightly bound states and thus can be regarded qualitatively as composite states of 3 quarks. Results of binding energies agree with those obtained from temporal 2-point functions within large systematic errors, which arise dominantly from the lattice artifact at short distances.
↳ hep-lathep-phnucl-thPTEP(2023)·7 citations
07
The Sphaleron Rate from 4D Euclidean Lattices
Marc Barroso Mancha🇩🇪 · Guy D. Moore🇩🇪
We develop a new method to determine thermal activation rates, such as for bubble nucleation, topology change, \textsl{etc.}, using 4-dimensional Euclidean methods. This allows nonperturbative study on the lattice. We then investigate the strong sphaleron rate in pure-glue QCD at temperatures between 1.3 $\Tc$ and 1000 $T_{c}$ , making contact with previous results but extending them down close to the critical temperature. The extension to full QCD will be straightforward. Limitations of the proposal (the inability to compute a certain dynamical prefactor, puzzling large-volume behavior, and the inability to treat temperatures $T < 1.3 T_{c}$ ) are also discussed.
↳ hep-lathep-phnucl-thJHEP(2023)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE

State Preparation in the Heisenberg Model through Adiabatic Spiraling

Photoproduction of e+e− in peripheral isobar collisions

Stronger C-odd color charge correlations in the proton at higher energy

Lattice QCD studies on decuplet baryons as meson-baryon bound states in the HAL QCD method

The Sphaleron Rate from 4D Euclidean Lattices

Affiliations

Photoproduction of $e^{+} e^{-}$ in peripheral isobar collisions

Stronger $C$ -odd color charge correlations in the proton at higher energy