Nuclear Theory·nucl-th

Friday·June 12, 2015

7 papers—4 primary·3 cross-listed

01
Forward-backward multiplicity fluctuation and longitudinal harmonics in high-energy nuclear collisions
Jiangyong Jia🇺🇸 · Sooraj Radhakrishnan🇺🇸 · Mingliang Zhou🇺🇸
An analysis method is proposed to study the forward-backward (FB) multiplicity fluctuation in high-energy nuclear collisions, built on the earlier work of Bzdak and Teaney. The method allows the decomposition of the centrality dependence of average multiplicity from the dynamical event-by-event (EbyE) fluctuation of multiplicity in pseudorapidity. Application of the method to AMPT and HIJING models shows that the long-range component of the FB correlation is captured by a few longitudinal harmonics, with the first component driven by the asymmetry in the number of participating nucleons in the two colliding nuclei. The higher-order longitudinal harmonics are found to be strongly damped in AMPT compare to HIJING, due to weaker short-range correlations as well as the final-state effects present in the AMPT model. Two-particle pseudorapidity correlation reveals interesting charge-dependent short-range structures that are absent in HIJING model. The proposed method opens an avenue to elucidate the particle production mechanism and early time dynamics in heavy-ion collisions. Future analysis directions and prospects of using the pseudorapidity correlation function to understand the centrality bias in $p$ + $p$ , $p$ +A and A+A collisions are discussed.
nucl-thhep-phPRC(2016)·57 citations
02
Ab initio alpha-alpha scattering
Serdar Elhatisari🇩🇪 · Dean Lee🇺🇸 · Gautam Rupak🇺🇸 · Evgeny Epelbaum🇩🇪 · Hermann Krebs🇩🇪 · Timo A. Lähde🇩🇪 · Thomas Luu🇩🇪 · Ulf-G. Meißner🇩🇪
Processes involving alpha particles and alpha-like nuclei comprise a major part of stellar nucleosynthesis and hypothesized mechanisms for thermonuclear supernovae. In an effort towards understanding alpha processes from first principles, we describe in this letter the first ab initio calculation of alpha-alpha scattering. We use lattice effective field theory to describe the low-energy interactions of nucleons and apply a technique called the adiabatic projection method to reduce the eight-body system to an effective two-cluster system. We find good agreement between lattice results and experimental phase shifts for S-wave and D-wave scattering. The computational scaling with particle number suggests that alpha processes involving heavier nuclei are also within reach in the near future.
nucl-thcond-mat.quant-gashep-latnucl-exNature(2015)·197 citations
03
Spectral statistics of rare-earth nuclei: Investigation of shell model configuration effect
H. Sabri
The spectral statistics of even-even rare-earth nuclei are investigated by using all the available empirical data for Ba, Ce, Nd, Sm, Gd, Dy, Er, Yb and Hf isotopes. The Berry- Robnik distribution and Maximum Likelihood estimation technique are used for analyses. An obvious deviation from GOE is observed for considered nuclei and there are some suggestions about the effect due to mass, deformation parameter and shell model configurations.
nucl-thNPA(2015)·9 citations
04
Charged-current quasielastic scattering of muon antineutrino and neutrino in the MINERvA experiment
Artur M. Ankowski🇺🇸
One of the largest sources of systematic uncertainties in ongoing neutrino-oscillation measurements is the description of nuclear effects. Its considerable reduction is expected thanks to the dedicated studies of (anti)neutrino-nucleus interactions in the MINERvA experiment. In this article, the calculations within the spectral function approach are compared to the charged-current quasielastic cross sections reported from MINERvA. The obtained results show that the effect of final-state interactions on the (anti)muon kinematics plays pivotal role in reproducing the experimental data.
nucl-thhep-exhep-phPRD(2015)·11 citations
05
Universal Relations for Range Corrections to Efimov Features
Chen Ji · Eric Braaten · Daniel R. Phillips · Lucas Platter
In a three-body system of identical bosons interacting through a large S-wave scattering length $a$ , there are several sets of Efimov features related by discrete scale invariance. Effective field theory was recently used to derive universal relations between these Efimov features that include the first-order correction due to a nonzero effective range $r_{s}$ . We reveal a simple pattern in these range corrections that had not been previously identified. The pattern is explained by the renormalization group for the effective field theory, which implies that the Efimov three-body parameter runs logarithmically with the momentum scale at a rate proportional to $r_{s} / a$ . The running Efimov parameter also explains the empirical observation that range corrections can be largely taken into account by shifting the Efimov parameter by an adjustable parameter divided by a. The accuracy of universal relations that include first-order range corrections is verified by comparing with various theoretical calculations using models with nonzero range.
↳ cond-mat.quant-gasnucl-thPRA(2015)·23 citations
06
Simulating Chiral Magnetic and Separation Effects with Spin-Orbit Coupled Atomic Gases
Xu-Guang Huang🇨🇳
The chiral magnetic and chiral separation effects---quantum-anomaly-induced electric current and chiral current along an external magnetic field in parity-odd quark-gluon plasma---have received intense studies in the community of heavy-ion collision physics. We show that analogous effects occur in rotating trapped Fermi gases with Weyl-Zeeman spin-orbit coupling where the rotation plays the role of an external magnetic field. These effects can induce a mass quadrupole in the atomic cloud along the rotation axis which may be tested in future experiments. Our results suggest that the spin-orbit coupled atomic gases are potential simulators of the chiral magnetic and separation effects.
↳ cond-mat.quant-gascond-mat.mes-hallhep-phnucl-thSci.Rep.(2016)·29 citations
07
Entanglement and Fast Quantum Thermalization in Heavy Ion Collisions
Chiu Man Ho🇺🇸 · Stephen D. H. Hsu🇺🇸
Let $A$ be subsystem of a larger system $A \cup B$ , and $ψ$ be a typical state from the subspace of the Hilbert space $H_{A B}$ satisfying an energy constraint. Then $ρ_{A} (ψ) = Tr_{B} ∣ ψ ⟩ ⟨ ψ ∣$ is nearly thermal. We discuss how this observation is related to fast thermalization of the central region ( $\approx A$ ) in heavy ion collisions, where $B$ represents other degrees of freedom (soft modes, hard jets, collinear particles) outside of $A$ . Entanglement between the modes in $A$ and $B$ plays a central role: the entanglement entropy $S_{A}$ increases rapidly in the collision. In gauge-gravity duality, $S_{A}$ is related to the area of extremal surfaces in the bulk, which can be studied using gravitational duals.
↳ hep-thhep-phnucl-thMod.Phys.Lett.A(2016)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE

Forward-backward multiplicity fluctuation and longitudinal harmonics in high-energy nuclear collisions

Ab initio alpha-alpha scattering

Spectral statistics of rare-earth nuclei: Investigation of shell model configuration effect

Charged-current quasielastic scattering of muon antineutrino and neutrino in the MINERvA experiment

Universal Relations for Range Corrections to Efimov Features

Simulating Chiral Magnetic and Separation Effects with Spin-Orbit Coupled Atomic Gases

Entanglement and Fast Quantum Thermalization in Heavy Ion Collisions

Affiliations