Nuclear Theory·nucl-th

Wednesday·July 24, 2024

9 papers—4 primary·5 cross-listed

05
Entanglement Enabled Intensity Interferometry in ultrarelativistic ultraperipheral nuclear collisions
James Daniel Brandenburg🇺🇸 · Haowu Duan🇺🇸 · Zhoudunming Tu🇺🇸 · Raju Venugopalan🇺🇸 · Zhangbu Xu🇺🇸
An important tool in studying the sub-femtoscale spacetime structure of matter in ultrarelativistic heavy-ion collisions is Hanbury-Brown-Twiss (HBT) intensity interferometry of identical particles in the final state of such collisions. We show here that a variant of an entanglement enabled intensity interferometry ( $E^{2} I^{2}$ ) proposed by Cotler and Wilczek provides a powerful alternative to HBT interferometry in extracting fundamental nonperturbative features of QCD at high energies. In particular, we show that the spatial distributions of color singlet (pomeron) configurations in nuclei can be obtained from exclusive resonant decays of $ρ$ -mesons into $π^{\pm}$ -pairs in ultrarelativistic ultraperipheral nuclear collisions (UPCs) at RHIC and the LHC. The $E^{2} I^{2}$ framework developed here is quite general. It can be employed to extract information on the spin structure of pomeron couplings as well as enhance the discovery potential for rare odderon configurations from exclusive vector meson decays into few-particle final states both in UPCs and at the Electron-Ion Collider.
↳ hep-phhep-thnucl-exnucl-thPRResearch(2025)·15 citations
06
The CSS Hamiltonian: high energy evolution of rapidity dependent observables
Haowu Duan🇺🇸 · Alex Kovner🇺🇸 · Michael Lublinsky🇮🇱
We consider evolution of observables which depend on a small but fixed value of longitudinal momentum fraction $x$ , to high rapidity, such that $η > ln 1/ x$ . We show that this evolution is not given by the JIMWLK (or BK) equation. We derive the evolution Hamiltonian - $H_{C S S - J I M W L K}$ which generates this evolution in the cases of dilute and dense projectile wave function. The two limits yield identical results for $H_{C S S - J I M W L K}$ . We show that the resulting evolution for the gluon TMD is identical to the (double logarithmic) perturbative Collins-Soper-Sterman evolution equation in the longitudinal resolution parameter at a fixed and very large transverse resolution.
↳ hep-phhep-thnucl-thPRD(2025)·10 citations
07
COLOSS: Complex-scaled Optical and couLOmb Scattering Solver
Junzhe Liu · Jin Lei · Zhongzhou Ren
We introduce COLOSS, a program designed to address the scattering problem using a bound-state technique known as complex scaling. In this method, the oscillatory boundary conditions of the wave function are transformed into exponentially decaying ones, accommodating the long-range Coulomb interaction. The program implements the Woods-Saxon form of a realistic optical potential, with all potential parameters included in a well-designed input format for ease of use. This design offers users straightforward access to compute $S$-matrices and cross-sections of the scattering process. We provide thorough discussions on the precision of Lagrange functions and their benefits in evaluating matrix elements. Additionally, COLOSS incorporates two distinct rotation methods, making it adaptable to potentials without analytical expressions. Comparative results demonstrate that COLOSS achieves high accuracy when compared with the direct integration method, Numerov, underscoring its utility and effectiveness in scattering calculations.
↳ physics.comp-phnucl-thComput.Phys.Commun.(2025)·4 citations
08
$ω$ meson from lattice QCD
Haobo Yan🇩🇪 · Maxim Mai🇩🇪 · Marco Garofalo🇩🇪 · Ulf-G. Meißner🇩🇪 · Chuan Liu🇨🇳 · Liuming Liu🇨🇳 · Carsten Urbach🇩🇪
Many excited states in the hadron spectrum have large branching ratios to three-hadron final states. Understanding such particles from first principles QCD requires input from lattice QCD with one-, two-, and three-meson interpolators as well as a reliable three-body formalism relating finite-volume spectra at unphysical pion mass values to the scattering amplitudes at the physical point. In this work, we provide the first-ever calculation of the resonance parameters of the $ω$ meson from lattice QCD, including an update of the formalism through matching to effective field theories. The main result of this pioneering study, the pole position of the $ω$ meson at $s_{ω} = (778.0 (11.2) - i 3.0 (5)) MeV$ , agrees reasonably well with experiment. In addition we provide an estimate of the $ω - ρ$ mass difference as $29 (15) MeV$ .
↳ hep-lathep-phnucl-thPRL(2024)·58 citations
09
Joint Inference of Population, Cosmology, and Neutron Star Equation of State from Gravitational Waves of Dark Binary Neutron Stars
Tathagata Ghosh🇮🇳 · Bhaskar Biswas🇩🇪 · Sukanta Bose🇮🇳 · Shasvath J. Kapadia🇮🇳
Gravitational waves (GWs) from binary neutron stars (BNSs) are expected to be accompanied by electromagnetic (EM) emissions, which help identify the host galaxy. Since GWs directly measure their luminosity distances, joint GW-EM observations from BNSs help with the study of cosmology, particularly the Hubble constant, unaffected by cosmic distance ladder systematics. However, detecting the EM emissions is not always possible. Additionally, the tidal deformability of neutron stars (NSs), combined with the knowledge of the NS EoS, can break the degeneracy between mass parameters and redshift, allowing for the inference of the Hubble constant. While several studies have aimed to infer the Hubble constant using dark BNSs (without EM counterparts), none have consistently combined the uncertainties of population, cosmology, and NS EoS within a Bayesian framework. In this study, we propose a novel Bayesian analysis to jointly constrain the NS EoS, population, and cosmological parameters using a population of dark BNSs detected through GW observations. We demonstrate the statistical robustness of our method using $50$ simulated BNS events following Gaussian and double Gaussian mass distributions, detected by Advanced LIGO and Advanced Virgo detectors operating at O5 sensitivity. We show that such measurements can constrain the Hubble constant with a precision of $≲ 35%$ ( $90%$ credible interval). This level of precision is unattainable without incorporating NS EoS, especially when observing BNS mergers without EM counterpart information. We also report the Hubble constant measurements obtained from a more realistic set of $5$ simulated BNS events.
↳ gr-qcastro-ph.COastro-ph.HEnucl-thAstrophys.J.Suppl.(2025)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE

Entanglement Enabled Intensity Interferometry in ultrarelativistic ultraperipheral nuclear collisions

The CSS Hamiltonian: high energy evolution of rapidity dependent observables

COLOSS: Complex-scaled Optical and couLOmb Scattering Solver

ω meson from lattice QCD

Joint Inference of Population, Cosmology, and Neutron Star Equation of State from Gravitational Waves of Dark Binary Neutron Stars

Affiliations

$ω$ meson from lattice QCD