Tue·Feb 10, 2015Tuesday·February 10, 2015

1. 01*

   Techniques for multiboson interferometry

   Dhevan Gangadharan🇺🇸

   The quantum statistics (QS) correlations of identical bosons are well known to be sensitive to the space-time extent and dynamics of the particle emitting source in high-energy collisions. While two-pion correlations are most often experimentally measured, the QS correlations of three-pions and higher are rarely explored. We present a set of techniques to isolate and analyze 3- and 4-pion QS correlations. In particular, the technique of built correlation functions allows one to more easily study the effects of quantum coherence at finite relative momenta instead of at the unmeasured intercept of correlation functions.

   ↳ nucl-thnucl-exPRC(2015)·28 citations
2. 02*

   Results of a direct search using synchrotron radiation for the low-energy ${}^{229}$Th nuclear isomeric transition

   Justin Jeet · Christian Schneider🇦🇹 · Scott T. Sullivan · Wade G. Rellergert · Saed Mirzadeh · A. Cassanho · H. P. Jenssen · Eugene V. Tkalya · Eric R. Hudson

   We report the results of a direct search for the ${}^{229}$Th ($I^p=3/2^{+}\leftarrow 5/2^{+}$) nuclear isomeric transition, performed by exposing ${}^{229}$Th-doped LiSrAlF${}_6$ crystals to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence. We also use existing nuclear physics data to establish a range of possible transition strengths for the isomeric transition. We find no evidence for the thorium nuclear transition between $7.3eV$ and $8.8eV$ with transition lifetime $(1-2)s\lesssim \tau \lesssim (2000-5600)s$. This measurement excludes roughly half of the favored transition search area and can be used to direct future searches.

   ↳ physics.atom-phnucl-exPRL(2015)·83 citations
3. 03*

   Back-to-back isolated photon-quarkonium production at the LHC and the transverse-momentum-dependent distributions of the gluons in the proton

   J.P. Lansberg🇫🇷

   The study of a quasi back-to-back isolated pair made of a heavy quarkonium, such as a J/psi or a Upsilon, and a photon produced in proton-proton collisions at the LHC, is probably the optimal way to get right away a first experimental determination of two gluon transverse-momentum-dependent distributions (TMDs) in an unpolarized proton, f1^g and h1^perp,g the latter giving the distribution of linearly polarized gluons. To substantiate this, we calculate the transverse-momentum-dependent effects that arise in the process under study and discuss the feasibility of their measurements.

   ↳ hep-phhep-exnucl-exnucl-thInt.J.Mod.Phys.Conf.Ser.(2016)·8 citations
4. 04*

   Lattice QCD Thermodynamics with Physical Quark Masses

   R.A. Soltz🇺🇸 · C. DeTar🇺🇸 · F. Karsch🇩🇪 · Swagato Mukherjee🇺🇸 · P. Vranas🇺🇸

   Over the past few years new physics methods and algorithms as well as the latest supercomputers have enabled the study of the QCD thermodynamic phase transition using lattice gauge theory numerical simulations with unprecedented control over systematic errors. This is largely a consequence of the ability to perform continuum extrapolations with physical quark masses. Here we review recent progress in lattice QCD thermodynamics, focussing mainly on results that benefit from the use of physical quark masses: the crossover temperature, the equation of state, and fluctuations of the quark number susceptibilities. In addition, we place a special emphasis on calculations that are directly relevant to the study of relativistic heavy ion collisions at RHIC and the LHC.

   ↳ hep-latnucl-exnucl-thAnn.Rev.Nucl.Part.Sci.(2015)·41 citations
5. 05*

   $v_4$, $v_5$, $v_6$, $v_7$: nonlinear hydrodynamic response versus LHC data

   Li Yan🇫🇷 · Jean-Yves Ollitrault🇫🇷

   Higher harmonics of anisotropic flow ($v_n$ with $n\ge 4$) in heavy-ion collisions can be measured either with respect to their own plane, or with respect to a plane constructed using lower-order harmonics. We explain how such measurements are related to event-plane correlations. We show that CMS data on $v_4$ and $v_6$ are compatible with ATLAS data on event-plane correlations. If one assumes that higher harmonics are the superposition of non-linear and linear responses, then the linear and non-linear parts can be isolated under fairly general assumptions. By combining analyses of higher harmonics with analyses of $v_2$ and $v_3$, one can eliminate the uncertainty from initial conditions and define quantities that only involve nonlinear hydrodynamic response coefficients. Experimental data on $v_4$, $v_5$ and $v_6$ are in good agreement with hydrodynamic calculations. We argue that $v_7$ can be measured with respect to elliptic and triangular flow. We present predictions for $v_7$ versus centrality in Pb-Pb collisions at the LHC.

   ↳ nucl-thhep-phnucl-exPLB(2015)·127 citations
6. 06*

   New developments in the statistical approach of parton distributions: tests and predictions up to LHC energies

   Claude Bourrely🇫🇷 · Jacques Soffer🇺🇸

   The quantum statistical parton distributions approach proposed more than one decade ago is revisited by considering a larger set of recent and accurate Deep Inelastic Scattering experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. This global next-to-leading order QCD analysis leads to a good description of several structure functions, involving unpolarized parton distributions and helicity distributions, in a broad range of $x$ and $Q^2$ and in terms of a rather small number of free parameters. There are several challenging issues and in particular the confirmation of a large positive gluon helicity distribution. The predictions of this theoretical approach will be tested for single-jet production and charge asymmetry in $W^{\pm }$ production in $\bar{p}p$ and $pp$ collisions up to LHC energies, using recent data and also for forthcoming experimental results.

   ↳ hep-phhep-exnucl-exNPA(2015)·70 citations
7. 07*

   Anisotropic Flow and Jet Quenching in Relativistic Nuclear Collisions

   Guang-You Qin🇨🇳

   The exploration of the strong-interaction matter under extreme conditions is one of the main goals of relativistic heavy-ion collisions. We provide some of the main results on the novel properties of quark-gluon plasma, with particular focus given to the strong collectivity and the color opaqueness exhibited by such hot and dense matter produced in high-energy nuclear collisions at RHIC and the LHC.

   ↳ hep-phnucl-exnucl-thIJMPE(2015)·10 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.