Nuclear Theory·nucl-th

Thursday·August 9, 2018

6 papers—2 primary·4 cross-listed

01
Constraints on the hybrid equation of state with a crossover hadron-quark phase transition in the light of GW170817
Cheng-Ming Li🇨🇳 · Yan Yan🇨🇳 · Jin-Jun Geng🇨🇳 · Yong-Feng Huang🇨🇳 · Hong-Shi Zong🇨🇳
In this paper, we use the recent updated source properties of GW170817 to constrain the hybrid equation of state (EOS) constructed by a three-window modeling between the hadronic EOS and quark EOS. Specifically, the hadronic EOS is described by NL3 $ω ρ$ model whose corresponding pure neutron star (NS) is already excluded by the constraint of tidal deformability (TD) from GW170817, and the quark EOS is calculated with 2+1 flavors Nambu-Jona-Lasinio (NJL) model. We also consider other four constraints on the hybrid EOS. As a result, we find the parameter set ( $B^{\frac{1}{4}}, μ ~, Γ$ ) can be well constrained, indicating the possible existence of the hybrid star (HS) with a crossover inside. The type of the two stars in the binary system for nine representative hybrid EOSs is shown in this paper too. Furthermore, the HSs restricted by five constraints do not suggest a pure quark core but a mixed-phase in center.
nucl-thPRD(2018)·52 citations
02
Extraction of $γ n \to π N$ observables from deuteron-target data
Satoshi X. Nakamura (Universidade Cruzeiro do Sul)🇧🇷
An examination is conducted on a commonly used procedure for extracting (un)polarized $γ n \to π^{-} p$ and $γ n \to π^{0} n$ observables from $d (γ, π^{-}) pp$ and $d (γ, π^{0}) p n$ data, using a model that consists of the impulse term and the final-state interaction (FSI) terms due to nucleon- and pion-exchange. Recent experimental and theoretical analyses used an extraction method that does not impose a cut on the final $π N$ invariant mass $W$ . I demonstrate that the use of this method can result in the $γ n \to π N$ observables that are seriously distorted by the nucleon Fermi motion, and that one can efficiently avoid this problem by imposing a cut on $W$ . It is also shown that the use of kinematical cuts of recent experimental analyses can still leave in the selected samples substantial FSI effects that must be corrected in extracting the $γ n \to π N$ cross sections. In terms of the nucleon- and pion-exchange mechanisms, I give the first qualitative explanation of the FSI corrections, obtained in a recent MAMI experiment, for extracting $γ n \to π^{0} n$ cross sections.
nucl-thhep-phnucl-exPRC(2018)·14 citations
03
Proof of NRQCD Color Octet Factorization of P-Wave Heavy Quarkonium Production In Non-Equilibrium QCD at RHIC and LHC
Gouranga C Nayak🇺🇸
Recently we have proved NRQCD color octet factorization of S-wave and P-wave heavy quarkonia production at all orders in coupling constant in QCD in vacuum at high energy colliders in Eur. Phys. J. C76 (2016) 448 and in arXiv:1807.04722 [hep-ph] respectively. In this paper we extend this to prove NRQCD color octet factorization of P-wave heavy quarkonium production in non-equilibrium QCD at RHIC and LHC at all orders in coupling constant. This proof is necessary to study the quark-gluon plasma at RHIC and LHC.
↳ hep-phnucl-th2 citations
04
Extracting many-body color charge correlators in the proton from exclusive DIS at large Bjorken x
Adrian Dumitru🇺🇸 · Gerald A. Miller🇺🇸 · Raju Venugopalan🇺🇸
We construct a general QCD light front formalism to compute many-body color charge correlators in the proton. These form factors can be extracted from deeply inelastic scattering measurements of exclusive final states in analogy to electromagnetic form factors extracted in elastic electron scattering experiments. Particularly noteworthy is the potential to extract a novel Odderon form factor, either indirectly from exclusive $J /Ψ$ measurements, or directly from exclusive measurements of the $η_{c}$ or tensor mesons at large Bjorken x. Besides the intrinsic information conveyed by these color charge correlators on the spatio-temporal tomography at the sub-femtoscopic scale at large x, the corresponding cumulants extend the domain of validity of McLerran-Venugopalan type weight functionals from small x and large nuclei to nucleons and light nuclei at large $x$ , as well as to non-zero momentum transfer. This may significantly reduce nonperturbative systematic uncertainties in the initial conditions for QCD evolution equations at small $x$ and could be of strong relevance for the phenomenology of present and future collider experiments.
↳ hep-phnucl-thPRD(2018)·45 citations
05
Thermoelectric effect and Seebeck coefficient for hot and dense hadronic matter
Jitesh R. Bhatt🇮🇳 · Arpan Das🇮🇳 · Hiranmaya Mishra🇮🇳
We investigate the thermoelectric effect for baryon rich plasma produced in heavy ion collision experiments. We estimate the associated Seebeck coefficient for the hadronic matter. Using kinetic theory within relaxation time approximation we calculate the Seebeck coefficient of a hadronic medium with a temperature gradient. The calculation is performed for hadronic matter modeled by hadron resonance gas model with hadrons and resonance states up to a cutoff in the mass as 2.25 GeV. We argue that the thermoelectric current produced by such effect can produce magnetic field in heavy ion collision experiments.
↳ hep-phnucl-thPRD(2019)·30 citations
06
Tidal Deformabilities and Neutron Star Mergers
Tianqi Zhao🇺🇸 · James M. Lattimer🇺🇸
Finite size effects in a neutron star merger are manifested, at leading order, through the tidal deformabilities (Lambdas) of the stars. If strong first-order phase transitions do not exist within neutron stars, both neutron stars are described by the same equation of state, and their Lambdas are highly correlated through their masses even if the equation of state is unknown. If, however, a strong phase transition exists between the central densities of the two stars, so that the more massive star has a phase transition and the least massive star does not, this correlation will be weakened. In all cases, a minimum Lambda for each neutron star mass is imposed by causality, and a less conservative limit is imposed by the unitary gas constraint, both of which we compute. In order to make the best use of gravitational wave data from mergers, it is important to include the correlations relating the Lambdas and the masses as well as lower limits to the Lambdas as a function of mass. Focusing on the case without strong phase transitions, and for mergers where the chirp mass M_chirp<1.4M_sun, which is the case for all observed double neutron star systems where a total mass has been accurately measured, we show that the dimensionless Lambdas satisfy Lambda_1/Lambda_2= q^6, where q=M_2/M_1 is the binary mass ratio; $M$ is mass of each star, respectively. Moreover, they are bounded by q^{n_-}>Lambda_1/Lambda_2> q^{n_{0+}+qn_{1+}}, where n_-<n_{0+}+qn_{1+}; the parameters depend only on M_chirp, which is accurately determined from the gravitational-wave signal. We also provide analytic expressions for the wider bounds that exist in the case of a strong phase transition. We argue that bounded ranges for Lambda_1/Lambda_2, tuned to M_chirp, together with lower bounds to Lambda(M), will be more useful in gravitational waveform modeling than other suggested approaches.
↳ astro-ph.HEastro-ph.SRgr-qcnucl-thPRD(2018)·122 citations

Affiliations

first authorsco-authorsvia INSPIRE

Constraints on the hybrid equation of state with a crossover hadron-quark phase transition in the light of GW170817

Extraction of γn→πN observables from deuteron-target data

Proof of NRQCD Color Octet Factorization of P-Wave Heavy Quarkonium Production In Non-Equilibrium QCD at RHIC and LHC

Extracting many-body color charge correlators in the proton from exclusive DIS at large Bjorken x

Thermoelectric effect and Seebeck coefficient for hot and dense hadronic matter

Tidal Deformabilities and Neutron Star Mergers

Affiliations

Extraction of $γ n \to π N$ observables from deuteron-target data