Bulletin of the American Physical Society
4th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 59, Number 10
Tuesday–Saturday, October 7–11, 2014; Waikoloa, Hawaii
Session MF: Postdeadline Session I |
Hide Abstracts |
Room: King's 2 |
Saturday, October 11, 2014 2:00PM - 2:15PM |
MF.00001: Transition form factors via lattice QCD Raul Briceno Lattice QCD has proven to be a fully predictive tool for studying low-energy hadronic physics directly from QCD. There are a number of matrix elements involving hadronic two-body initial and/or final states for which a lattice QCD calculation would lead to significant advancement for nuclear and particle physics, e.g., parity violation in the nuclear sector. In this talk I address challenges associated with studying observables for processes involving two particles or more, and I present a framework for studying one-to-two transition form factors. [Preview Abstract] |
Saturday, October 11, 2014 2:15PM - 2:30PM |
MF.00002: eRHIC -- future High-Luminosity, High- Energy Electron-Ion Collider at BNL Vladimir Litvinenko I will present our plans for future electron-ion collider (EIC), based on the existing Relativistic Heavy Ion Collider (RHIC) hadron facility. We plan adding a polarized electron-beam driven by Energy-Recovery Linac with energy tunable within the 5-21-GeV range to collide with variety of species in the existing RHIC-accelerator complex, from polarized protons with a top energy of 250 GeV, to heavy fully striped ions with energies up to 100 GeV/u. I will present original design of the collider using two FFAG arcs for16-passes of electron beam as well as the design parameters. I will discuss progress of an intensive R{\&}D program towards eRHIC, which is underway at BNL. [Preview Abstract] |
(Author Not Attending)
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MF.00003: NLO transverse momentum broadening and QCD evolution of jet transport parameter Hongxi Xing, Zhong-Bo Kang, Enke Wang, Xin-Nian Wang There have been a lot of efforts focused on qualitative and quantitative studies of the properties of the sQGP through jet quenching. However, it is not clear whether the properties of the medium such as the jet transport parameter as probed by a propagating jet is unique and intrinsic to the medium, independent of the hard processes that produce the energetic jets. This is a problem of factorization of multiple scattering in QCD and so far has eluded many theoretical efforts. In this talk, we show you the first complete NLO calculation of transverse momentum broadening in SIDIS e$+$A , Drell-Yan and Higgs in p$+$A collisions. We demonstrate for the first time how QCD factorization holds for multiple parton scattering and the universality of the associated quark-gluon and gluon-gluon correlation functions or properties of nuclear matter contained therein as probed by a propagating parton, independent of the hard processes that create the fast partons. Our calculation also identifies the QCD evolution equation for this quark-gluon and gluon-gluon correlation functions, which determines the QCD scale and jet energy dependence of the jet transport parameter. We further solve the QCD evolution equation of jet transport parameter numerically and determine the scale and energy dependence of the jet transport parameter in cold and hot dense medium, which paves the way to extract the precise information of nuclear medium. [Preview Abstract] |
Saturday, October 11, 2014 2:45PM - 3:00PM |
MF.00004: A Measurement of the Proton Spin Dependent Structure Function, $g_2$, at Low $Q^2$ Toby Badman Measurements of the nucleon spin-dependent structure functions have proven to be powerful tools in testing the validity of a number of effective theories of Quantum Chromodynamics. The neutron spin structure functions ($g_1^n$, $g_2^n$) and the proton spin structure function ($g^{p}_{1}$) have been measured to very high precision over a wide kinematic range. However, the proton structure function, $g^{p}_{2}$, remains largely unmeasured. The primary goal of JLab Hall A experiment E08-027 is to perform an inclusive measurement of the proton $g_2$ structure function in the low momentum transfer range of ($0.02 < Q^2 < 0.2 $GeV$^2$). The experiment will allow us to test the Burkhardt-Cottingham Sum Rule at low $Q^2$ as well as extract the longitudinal-transverse generalized spin polarizability and compare it to predictions made by Chiral Perturbation Theory. The experiment acquired data at Jefferson Lab in Hall A during March - May of 2012. The details of the experiment will be presented, along with online results and an overview of the analysis progress. [Preview Abstract] |
Saturday, October 11, 2014 3:00PM - 3:15PM |
MF.00005: Jet quenching phenomenology from soft-collinear effective theory with Glauber gluons Ivan Vitev, Grigory Ovanesyan, Robin Lashoff-Regas, Philip Saad, Ivan Vitev We present the first application of a recently-developed effective theory of jet propagation in matter ${\rm SCET_G}$ to inclusive hadron suppression in nucleus-nucleus collisions at the LHC. ${\rm SCET_G}$-based splitting kernels allow us to go beyond the traditional energy loss approximation and unify the treatment of vacuum and medium-induced parton showers. In the soft gluon emission limit, we establish a simple analytic relation between the QCD evolution and energy loss approaches to jet quenching. We quantify the uncertainties associated with the implementation of the in-medium modification of hadron production cross sections and show that the coupling between the jet and the medium can be constrained with better than 10\% accuracy. [Preview Abstract] |
Saturday, October 11, 2014 3:15PM - 3:30PM |
MF.00006: Towards the high pT v2 and open heavy flavor in AA using a pQCD+hydro approach Jiechen Xu, Miklos Gyulassy We present numerical results of the high $p_T$ pion, open heavy flavor, and non-photonic electron $R_{AA}$ and $v_2$ at RHIC and LHC from the new CUJET2.0 model, where the running coupling DGLV opacity series is coupled with 2+1D viscous hydrodynamical fluids. CUJET2.0 solved the ``heavy quark energy loss puzzle" -- the $R_{AA}^{\pi,D,e^-}(p_T)$ computed from this model is highly consistent with existing data -- and it predicts a robust crossing between $R_{AA}^{\pi,D}(p_T)$ and $R_{AA}^{B}(p_T)$. We find that within CUJET2.0, the 50\% underestimate of $v_2^{\pi}(p_T)$ at both RHIC and LHC can be accounted for by relaxing the assumption that $\alpha_{max}$, an assumed upper bound of the running coupling in the infrared, is independent of the local temperature field and allowing as small as 10\% enhancement of the path averaged $\alpha_{max}$ from in-plane to out-of-plane paths. We speculate the origin of such variations and provide predictions of $v_2^{D,B,e^-}(p_T>5)$ from CUJET2.0 as future tests to help elucidating this ``tricky azimuthal dependence" of jet quenching seen at RHIC and LHC. (Reference: J. Xu, A. Buzzatti, and M. Gyulassy, ``Azimuthal Jet Flavor Tomography with CUJET2.0 of Nuclear Collisions at RHIC and LHC'', arXiv:1402.2956. To appear in JHEP. ) [Preview Abstract] |
Saturday, October 11, 2014 3:30PM - 3:45PM |
MF.00007: Initial-State Bremsstrahlung versus Final-State Hydrodynamic Sources of Azimuthal Harmonics at RHIC and LHC Miklos Gyulassy, Peter Levai, Ivan Vitev, Tamas Biro Recent azimuthal correlation data from the Beam Energy Scan (BES) and d+Au runs at RHIC/BNL and, the surprising similarity of multiparticle cummulant azimuthal harmonics in p+Pb and Pb+Pb at LHC have challenged the uniqueness of local equilibrium ``perfect fluid'' interpretations of those data. We report results derived in arXiv:1405.7825 [hep-ph] on azimuthal harmonics arising from initial-state non-abelian ``wave interference'' effects predicted by perturbative QCD sourced by Color Scintillation Arrays (CSA) of color antennas associated with multiple projectile and target soft beam jets. We find a remarkable similarity between azimuthal harmonics sourced by initial state CSA and those predicted with final state perfect fluid models of high energy p+A reactions. [Preview Abstract] |
Saturday, October 11, 2014 3:45PM - 4:00PM |
MF.00008: Excitation energy dependence of fission fragment yield curves John Lestone It is well known that fission yield curves depend on excitation energy. For low-energy fission of actinides the yield curves are asymmetric with the heavy mass peak centered near $A \sim 140$. At many tens of MeV of excitation energy the yield curves become symmetric. For some applied applications the small yield-curve changes associated with moving from thermal-neutron induced fission to fast-neutron induced fission are of great importance. An analysis of the small changes in the $^{238}$U(n,$f)$ yield curves at inducing neutron energies of 2 and 5.5 MeV, and the differences between the $^{240}$Pu spontaneous fission and $^{239}$Pu(n$_{\mathrm{th}}$,$f)$ yield curves suggest that the yield curves are not determined by the nuclear potential energy surface near the fission saddle point, but instead defined by the nuclear potential energy surface at large deformation close to the scission configuration. The widths of the mass peaks in the low-energy fission of actinides appear to be due to Langevin-driven shape fluctuations in a heat bath with a temperature of $\sim$ 0.8 MeV. [Preview Abstract] |
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