Nuclear Theory·nucl-th

Thursday·November 3, 2016

11 papers—5 primary·6 cross-listed

06
Neutrino Interactions and Long-Baseline Experiments
Ulrich Mosel🇩🇪
The extraction of neutrino mixing parameters and the CP-violating phase requires knowledge of the neutrino energy. This energy must be reconstructed from the final state of a neutrino-nucleus reaction since all long-baseline experiments use nuclear targets. This reconstruction requires detailed knowledge of the neutrino reactions with bound nucleons and of the final state interactions of hadrons with the nuclear environment. Quantum-kinetic transport theory can be used to build an event generator for this reconstruction that takes basic nuclear properties, such as binding, into account. Some examples are discussed that show the effects of nuclear interactions on observables in long-baseline experiments
↳ hep-exhep-phnucl-thPoS(2016)·1 citation
07
Estimate on Spin Asymmetry for Drell-Yan Process at Fermilab with Tensor-Polarized Deuteron
S. Kumano🇯🇵 · Qin-Tao Song🇯🇵
There are four new structure functions for the spin-1 deuteron in comparison with the ones for the spin-1/2 proton, and they are called $b_{1}$ , $b_{2}$ , $b_{3}$ , and $b_{4}$ . The twist-2 structure functions $b_{1}$ and $b_{2}$ are expressed by tensor-polarized parton distribution functions in the deuteron. HERMES measurements of $b_{1}$ are much different from the prediction of the standard deuteron model with D-state admixture. It indicates that the structure functions $b_{1}$ and $b_{2}$ probe an interesting new aspect in the deuteron. There is an approved experiment at JLab to measure $b_{1}$ and it is expected to start in 2019. On the other hand, the measurement of tensor-polarized distributions is under consideration at Fermilab by the Drell-Yan process with the unpolarized proton beam and tensor-polarized deuteron target. It is expected to provide crucial information on tensor-polarized antiquark distributions. Since the distributions are small quantities, it is important to estimate the tensor-polarized spin asymmetry theoretically to find experimental feasibility for an actual proposal at Fermilab.
↳ hep-phhep-exnucl-exnucl-thJPS Conf.Proc.(2017)·2 citations
08
The one loop gluon emission light cone wave function
Tuomas Lappi🇫🇮 · Risto Paatelainen🇪🇸
Light cone perturbation theory has become an essential tool to calculate cross sections for various small- $x$ dilute-dense processes such as deep inelastic scattering and forward proton-proton and proton-nucleus collisions. Here we set out to do one loop calculations in an explicit helicity basis in the four dimensional helicity scheme. As a first process we calculate light cone wave function for one gluon emission to one-loop order in Hamiltonian perturbation theory on the light front. We regulate ultraviolet divergences with transverse dimensional regularization and soft divergences with using a cut-off on longitudinal momentum. We show that when all the renormalization constants are combined, the ultraviolet divergences can be absorbed into the standard QCD running coupling constant, and give an explicit expression for the remaining finite part.
↳ hep-phnucl-thAnnals Phys.(2017)·40 citations
09
Heavy-Quark Diffusion Dynamics in Quark-Gluon Plasma under Strong Magnetic Fields
Koichi Hattori🇨🇳 · Kenji Fukushima🇯🇵 · Ho-Ung Yee🇺🇸 · Yi Yin🇺🇸
We discuss heavy-quark dynamics in the quark-gluon plasma under a strong magnetic field induced by colliding nuclei. By the use of the diagrammatic resummation techniques for Hard Thermal Loop and the external magnetic field, we show analytic results of heavy-quark diffusion coefficient and drag force which become anisotropic due to the preferred spatial orientation in the magnetic field. We argue that the anisotropic diffusion coefficient gives rise to an enhancement/suppression of the heavy-quark elliptic flow depending on the transverse momentum.
↳ hep-phnucl-exnucl-thNucl.Part.Phys.Proc.(2017)·8 citations
10
Quarkonium production at collider energies in Small- $x$ formalism
Kazuhiro Watanabe🇨🇳
I present a short review of recent studies of quarkonium production in proton-proton and proton-nucleus collisions at collider energies in Small- $x$ formalism.
↳ hep-phhep-exnucl-exnucl-thFew Body Syst.(2017)·6 citations
11
Cosmological Implications of QGP Bulk Viscosity
Sampurn Anand🇮🇳 · Abhishek Atreya🇮🇳 · Jitesh R. Bhatt🇮🇳
Recent studies of the hot QCD matter indicate that the bulk viscosity ( $ζ$ ) of quark-gluon plasma (QGP) rises sharply near the critical point of the QCD phase transition. In this work, we show that such a sharp rise of the bulk viscosity will lead to an effective negative pressure near the critical temperature, $T_{c}$ which in turn drives the Universe to inflate. This inflation has a natural graceful exist when the viscous effect evanesce. We estimate that, depending upon the peak value of $ζ$ , universe expands by a factor of $10$ to $80$ times in a very short span ( $Δ t \sim 1 0^{- 8}$ seconds). Another important outcome of the bulk viscosity dominated dynamics is the cavitation of QGP around $T \sim 1.5 T_{c}$ . This would lead to the phenomenon of formation of cavitation bubbles within the QGP phase. The above scenario is independent of the order of QCD phase transition. We delineate some of the important cosmological consequences of the inflation and the cavitation.
↳ hep-phgr-qchep-thnucl-th1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Neutrino Interactions and Long-Baseline Experiments

Estimate on Spin Asymmetry for Drell-Yan Process at Fermilab with Tensor-Polarized Deuteron

The one loop gluon emission light cone wave function

Heavy-Quark Diffusion Dynamics in Quark-Gluon Plasma under Strong Magnetic Fields

Quarkonium production at collider energies in Small-x formalism

Cosmological Implications of QGP Bulk Viscosity

Affiliations

Quarkonium production at collider energies in Small- $x$ formalism