Conveners
Correlations and fluctuations: 1
- Ulrich Heinz (The Ohio State University)
Correlations and fluctuations: 2
- George Fai (U)
Correlations and fluctuations: 3
- Jurgen Schukraft (CERN)
Correlations and fluctuations: 4
- Alberica Toia (Johann-Wolfgang-Goethe Univ. (DE))
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Ron Belmont (Wayne State University (US))20/05/2014, 11:10Collective DynamicsContributed TalkWhile no P- or CP-violation has ever been observed in the strong sector of the Standard Model, there is no first principles reason for it not to be present. Theoretical calculations have shown the possibility of P-violating bubbles in the QCD vacuum, which in combination with the strong magnetic field created in off-central heavy-ion collisions leads to the Chiral Magnetic Effect...Go to contribution page
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Umut Gursoy (University of Utrecht (NL))20/05/2014, 11:30Correlations and FluctuationsContributed TalkThe hot QCD matter produced in any heavy ion collision with a nonzero impact parameter is produced within a strong magnetic field. We study the imprint that these fields leave on the azimuthal distributions and correlations of the produced charged hadrons. The magnetic field is time-dependent and the medium is expanding, which leads to the induction of charged currents due to the...Go to contribution page
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Prof. Sergei Voloshin (Wayne State University)20/05/2014, 11:50Correlations and FluctuationsContributed TalkRecently, the STAR Collaboration has reported a strong dependence of the elliptic flow of positive and negative pions on the net charge density [1]. This measurement attracted a lot of community attention, as the signal appeared to be of the magnitude and the sign of that predicted by the theory of the Chiral Magnetic Wave [2]. At the same time the interpretation of the results and...Go to contribution page
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Quan Wang (University of Kansas (US))20/05/2014, 12:10Correlations and FluctuationsContributed TalkMotivated by two- and four-particle azimuthal correlation measurements that suggest possible collective flow for charged particles emitted in pPb collisions at $\sqrt{s_{NN}}$ =5.02 TeV, we extend the correlation results for these collisions using the six- and eight-particle cumulant methods, and the Lee-Yang Zeros method. CMS has an extensive program studying azimuthal harmonic coefficients...Go to contribution page
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Dominik Karol Derendarz (Polish Academy of Sciences (PL))20/05/2014, 12:30Correlations and FluctuationsContributed TalkWe report on measurements of the anisotropy of charged particles in lead-lead collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV, using multi-particle cumulants calculated with the generating function method. The results on the transverse momentum, pseudorapidity and centrality dependence of the elliptic flow (v2) obtained from two-, four-, six- and eight-particle cumulants are presented....Go to contribution page
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Li Yan20/05/2014, 12:50Correlations and FluctuationsContributed TalkWe propose a new, universal parametrization of the probability distribution of initial anisotropies in proton-proton, proton-nucleus and nucleus-nucleus collisions. The distribution of fluctuation-driven anisotropies, such as the initial triangularity $\varepsilon_3$, is described by a one-parameter power distribution. When a mean anisotropy in the reaction plane is also present, as in the...Go to contribution page
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Lingshan Xu (Purdue University (US))20/05/2014, 14:20Collective DynamicsContributed TalkTwo-particle long-range pseudorapidity ($\Delta$$\eta$) correlations are observed in pPb collisions at the LHC. Previous correlation measurements have been averaged over both the trigger and associated particle $\eta$. In order to explore the possible pseudorapidity dependence of the long-range correlations in asymmetric pPb collisions, a new analysis of two-particle correlations with trigger...Go to contribution page
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Leonardo Milano (CERN)20/05/2014, 14:40Correlations and FluctuationsContributed TalkThe observation of long-range correlations on the near- and away-side (also known as the double-ridge) in high-multiplicity p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV and its similarity to Pb-Pb collisions remains one of the open questions from the p-Pb run at the Large Hadron Collider. It has been attributed to mechanisms that involve initial-state effects, such as gluon saturation and...Go to contribution page
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Sooraj Krishnan Radhakrishnan (State University of New York (US))20/05/2014, 15:00Correlations and FluctuationsContributed TalkDetailed measurement of the Fourier harmonics ($v_n$) associated with the azimuthal modulation of two-particle correlation structures over $-5 < \delta\eta < 5$ in 31 nb$^{-1}$ p + Pb collisions are presented. The $v_n$ results are presented as a function of $p_T$, \eta, and event activity characterized by the number of reconstructed tracks in $-2.5 < \eta < 2.5$, and the total transverse...Go to contribution page
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Dr shengli huang (PHENIX Collaboration)20/05/2014, 15:20Correlations and FluctuationsContributed TalkTraditionally $p(d)$$+$A collisions at RHIC and the LHC were considered as a tool to study cold nuclear matter effects. Production of the hot and dense medium in such collisions was not expected. However recent measurements has challenged this assumption with the observation of long-range correlations in angular distributions of hadron pairs with low transverse momentum. The observed...Go to contribution page
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Monika Sharma (Vanderbilt University (US))20/05/2014, 15:40Collective DynamicsContributed TalkObservation of a long-range near-side two-particle correlation (known as the "Ridge") in high-multiplicity pp and pPb collisions opened up new opportunities of exploring novel QCD dynamics in small collision systems. To further investigate the origin of this phenomenon, new measurements of two-particle correlations with identified $\pi^0$, $K^0_s$ and Lambda trigger particles in 5.02 TeV pPb...Go to contribution page
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Dr Bjoern Schenke (Brookhaven National Lab)21/05/2014, 09:00Correlations and FluctuationsContributed TalkThe IP-Glasma initial state model [1,2] coupled to relativistic viscous fluid dynamics successfully describes particle spectra, anisotropic flow, and its fluctuations in central to mid-central heavy-ion collisions [3]. Here we extend the study to more peripheral events and determine if the description remains robust. We then perform a direct comparison of peripheral A+A events with p+A and p+p...Go to contribution page
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Igor Kozlov (McGill University)21/05/2014, 09:20Correlations and FluctuationsContributed TalkWe perform 3+1D viscous hydrodynamic calculations of proton-nucleus and nucleus-nucleus collisions. The goal is to ascertain the nature of the striking correlations seen in recent proton-nucleus collisions. In particular, one would like to know: is the observed ridge a signature of collective behavior? Can the highest multiplicity collision systems be accurately described as a...Go to contribution page
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Prof. Joseph Kapusta (University of Minnesota)21/05/2014, 09:40Correlations and FluctuationsContributed TalkWe construct a model of baryon diffusion which has the desired properties of causality and analyticity. The model also has the desired property of colored noise, meaning that the noise correlation function is not a Dirac delta function in space and time; rather, it depends on multiple time and length constants. The model can readily be incorporated in 3+1 dimensional 2nd order viscous...Go to contribution page
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Dr Jussi Auvinen (Frankfurt Institute for Advanced Studies)21/05/2014, 10:00Collective DynamicsContributed TalkThe midrapidity slope d$v_1$/d$y$ of the directed flow $v_1$ has been predicted to be sensitive to the possible first-order phase transition between the hadron gas and the quark-gluon plasma. The recent STAR data from the RHIC beam energy scan (BES) show that the net-proton d$v_1$/d$y$ changes sign twice within the collision energy range 7.7 - 39 GeV. To further investigate this phenomenon,...Go to contribution page
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Laszlo Csernai (Department of Physics and Technology)21/05/2014, 10:20Correlations and FluctuationsContributed TalkWith increasing beam energies the angular momentum of the fireball in peripheral heavy ion collisions is increasing. The earlier predicted rotation effect and Kelvin Helmholtz Instability, leads to space-time momentum correlations among the emitted particles. For these reactions two particle correlations are studied. A specific combination of two particle correlation measurements is proposed,...Go to contribution page
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Sunil Manohar Dogra (UNESP - Universidade Estadual Paulista (BR))21/05/2014, 11:10Correlations and FluctuationsContributed TalkMultidimensional and one-dimensional quantum-statistical (Bose-Einstein) correlations are measured in proton-proton collisions at 0.9, 2.76 and 7 TeV, and in proton-lead collisions at 5.02 TeV/nucleon pair center-of-mass energy with the CMS detector at the LHC. The correlation functions are extracted in terms of different components of the relative momentum of the pair, in order to investigate...Go to contribution page
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Dhevan Raja Gangadharan (Lawrence Berkeley National Lab. (US))21/05/2014, 11:30Correlations and FluctuationsContributed TalkTwo-pion Bose-Einstein correlations are often used to extract the radius of the particle emitting source at freeze-out. The extraction of the radii in low multiplicity systems is complicated by the presence of background correlations such as mini-jets. Such backgrounds can be suppressed through the use of three-pion cumulant correlations. We present two- and three-pion Bose-Einstein...Go to contribution page
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Prof. Yuri Sinyukov (Bogolyubov Institute for Theoretical Physics)21/05/2014, 11:50Correlations and FluctuationsContributed TalkThe femtoscopic scales for identical pions and kaons are presented at different centralities for the top energy RHIC and LHC A+A collisions in comparison with ones for p+p collisions. The later results are obtained in hydrokinetic model (HKM) in view of the quantum uncertainty principle. The three-dimensional pion and kaon emission source functions are extracted from the HKM model...Go to contribution page
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Shinichi Esumi (University of Tsukuba (JP))21/05/2014, 12:10Correlations and FluctuationsContributed TalkThe initial density distribution in a heavy ion collision fluctuates due to the finite number of participating nucleons, which leads to higher harmonic flow as recently measured at RHIC and the LHC. Such spatial fluctuations may be preserved until kinetic freeze-out, depending on the strength of the initial fluctuations, the flow profile, the expansion time, and viscosity of the created...Go to contribution page
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Nuggehalli AJITANAND (Stony Brook University)21/05/2014, 12:30Collective DynamicsContributed TalkRecent results obtained at RHIC and the LHC have revealed the presence of unexpected collective effects in central $p(d)$$+$A collisions. Different techniques and physical observables have been utilized to understand whether these collective effects have a similar origin to heavy ion collisions or can be explained solely by cold nuclear matter effects. Two-pion Bose-Einstein correlation...Go to contribution page
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Chiho Nonaka (Nagoya University)21/05/2014, 12:50Collective DynamicsContributed TalkRecently the results of azimuthal HBT measurements with respect to the second and third order event plane are presented by PHENIX [1]. They extract $\epsilon_2$ and $\epsilon_3$ from the HBT radii which contain information about not only the source shape at freezeout but also the space-time evolution of QGP matter. They show the relation between initial $\epsilon_{2, 3}$ which are...Go to contribution page
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Vera Loggins (Wayne State University (US))21/05/2014, 13:10Correlations and FluctuationsContributed TalkFemtoscopy of non-central heavy-ion collisions provides access to information on the geometry of the effective pion-emitting source. In particular, its shape can be studied by measuring femtoscopic radii as a function of the emission angle relative to the collision plane of symmetry. We present the first measurements of azimuthally differential femtoscopy in Pb-Pb collisions $\sqrt{s_{\rm...Go to contribution page