Thu·Nov 3, 2016Thursday·November 3, 2016

1. 01*

   Collectivity in small collision systems : an initial state perspective

   Sören Schlichting🇺🇸 · Prithwish Tribedy🇺🇸

   Measurements of multi-particle correlations in the collisions of small systems such as $p+p$, $p/d{/}^{3}He+A$ show striking similarity to the observations in heavy ion collisions. A number of observables measured in the high multiplicity events of these systems resemble features that are attributed to collectivity driven by hydrodynamics. However alternative explanations based on initial state dynamics are able to describe many characteristic features of these measurements. In this brief review we highlight some of the recent developments and outstanding issues in this direction.

   ↳ hep-phnucl-exnucl-thAdv.High Energy Phys.(2016)·96 citations
2. 02*

   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
3. 03*

   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
4. 04*

   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
5. 05*

   Determining the dominant partial wave contributions from angular distributions of single- and double-polarization observables in pseudoscalar meson photoproduction

   Y. Wunderlich🇩🇪 · F. Afzal🇩🇪 · A. Thiel🇩🇪 · R. Beck🇩🇪

   This work presents a simple method to determine the significant partial wave contributions to experimentally determined observables in pseudoscalar meson photoproduction. First, fits to angular distributions are presented and the maximum orbital angular momentum ${\text{L}}_{\max }$ needed to achieve a good fit is determined. Then, recent polarization measurements for $\gamma p\to {\pi }^{0}p$ from ELSA, GRAAL, JLab and MAMI are investigated according to the proposed method. This method allows us to project high-spin partial wave contributions to any observable as long as the measurement has the necessary statistical accuracy. We show, that high precision and large angular coverage in the polarization data are needed in order to be sensitive to high-spin resonance-states and thereby also for the finding of small resonance contributions. This task can be achieved via interference of these resonances with the well-known states. For the channel $\gamma p\to {\pi }^{0}p$, those are the $N(1680){\frac{5}{2}}^{+}$ and $\Delta (1950){\frac{7}{2}}^{+}$, contributing to the $F$-waves.

   ↳ physics.data-annucl-exphysics.ins-detEPJA(2017)·37 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.