Browsing by Author "Müller, B"

Now showing 1 - 7 of 7
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    Electric charge separation in strong transient magnetic fields
    (Physical Review C - Nuclear Physics, 2010-07-21) Asakawa, M; Majumder, A; Müller, B
    We discuss various mechanisms for the creation of an asymmetric charge fluctuation with respect to the reaction plane among hadrons emitted in relativistic heavy-ion collisions. We show that such mechanisms exist in both the hadronic gas and the partonic phases of quantum chromodynamics. The mechanisms considered here all require the presence of a strong magnetic field (the "chiral magnetic effect"), but they do not involve parity or charge-parity violations. We analyze how a transient local electric current fluctuation generated by the chiral magnetic effect can dynamically evolve into an asymmetric charge distribution among final-state hadrons in momentum space. We estimate the magnitude of the event-by-event fluctuations of the final-state charge asymmetry owing to partonic and hadronic mechanisms. © 2010 The American Physical Society.
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    Electron-Ion Collider: The next QCD frontier: Understanding the glue that binds us all
    (European Physical Journal A, 2016-09-01) Accardi, A; Albacete, JL; Anselmino, M; Armesto, N; Aschenauer, EC; Bacchetta, A; Boer, D; Brooks, WK; Burton, T; Chang, NB; Deng, WT; Deshpande, A; Diehl, M; Dumitru, A; Dupré, R; Ent, R; Fazio, S; Gao, H; Guzey, V; Hakobyan, H; Hao, Y; Hasch, D; Holt, R; Horn, T; Huang, M; Hutton, A; Hyde, C; Jalilian-Marian, J; Klein, S; Kopeliovich, B; Kovchegov, Y; Kumar, K; Kumerički, K; Lamont, MAC; Lappi, T; Lee, JH; Lee, Y; Levin, EM; Lin, FL; Litvinenko, V; Ludlam, TW; Marquet, C; Meziani, ZE; McKeown, R; Metz, A; Milner, R; Morozov, VS; Mueller, AH; Müller, B; Müller, D; Nadel-Turonski, P; Paukkunen, H; Prokudin, A; Ptitsyn, V; Qian, X; Qiu, JW; Ramsey-Musolf, M; Roser, T; Sabatié, F; Sassot, R; Schnell, G; Schweitzer, P; Sichtermann, E; Stratmann, M; Strikman, M; Sullivan, M; Taneja, S; Toll, T; Trbojevic, D; Ullrich, T; Venugopalan, R; Vigdor, S; Vogelsang, W; Weiss, C; Xiao, BW; Yuan, F; Zhang, YH; Zheng, L
    © 2016, The Author(s). This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on the structure and interactions of gluon-dominated matter, with the intent to articulate it to the broader nuclear science community. It was commissioned by the managements of Brookhaven National Laboratory (BNL) and Thomas Jefferson National Accelerator Facility (JLab) with the objective of presenting a summary of scientific opportunities and goals of the EIC as a follow-up to the 2007 NSAC Long Range plan. This document is a culmination of a community-wide effort in nuclear science following a series of workshops on EIC physics over the past decades and, in particular, the focused ten-week program on “Gluons and quark sea at high energies” at the Institute for Nuclear Theory in Fall 2010. It contains a brief description of a few golden physics measurements along with accelerator and detector concepts required to achieve them. It has been benefited profoundly from inputs by the users’ communities of BNL and JLab. This White Paper offers the promise to propel the QCD science program in the US, established with the CEBAF accelerator at JLab and the RHIC collider at BNL, to the next QCD frontier.
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    Issues with the search for critical point in QCD with relativistic heavy ion collisions
    (Physical Review C, 2020-03-01) Asakawa, M; Kitazawa, M; Müller, B
    © 2020 American Physical Society. A systematic search for a critical point in the phase diagram of QCD matter is under way at the Relativistic Heavy Ion Collider (RHIC) and is planned at several future facilities. Its existence, if confirmed, and its location will greatly enhance our understanding of QCD. In this article, we emphasize several important issues that are often not fully recognized in theoretical interpretations of experimental results relevant to the critical point search. We discuss ways in which our understanding on these issues can be improved.
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    Momentum broadening of a fast parton in a perturbative quark-gluon plasma
    (Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009-12-17) Majumder, A; Müller, B; Mrówczyński, S
    The average transverse momentum transfer per unit path length to a fast parton scattering elastically in a perturbative quark-gluon plasma is related to the radiative energy loss of the parton. We first calculate the momentum transfer coefficient q^ in terms of a classical Langevin problem and then define it quantum mechanically through a scattering matrix element. After treating the well-known case of a quark-gluon plasma in equilibrium, we consider an off-equilibrium unstable plasma. As a specific example, we treat the two-stream plasma with unstable modes of longitudinal chromoelectric field. In the presence of the instabilities, q^ is shown to exponentially grow in time. © 2009 The American Physical Society.
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    Quasilinear transport approach to equilibration of quark-gluon plasmas
    (Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010-03-18) Mrówczyński, S; Müller, B
    We derive the transport equations of quark-gluon plasma in the quasilinear approximation. The equations are either of the Balescu-Lenard or Fokker-Planck form. The plasma's dynamics is assumed to be governed by longitudinal chromoelectric fields. The isotropic plasma, which is stable, and the two-stream system, which is unstable, are considered in detail. A process of equilibration is briefly discussed in both cases. The peaks of the two-stream distribution are shown to rapidly dissolve in time. © 2010 The American Physical Society.
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    relation at next-to-leading order in QCD
    (Physical Review D, 2021-10-01) Müller, B
    The relation between the specific shear viscosity and the dimensionless jet quenching parameter in perturbative QCD is explored at next-to-leading order in the coupling constant. It is shown that the relation changes little, although both transport coefficients independently are subject to large modifications at the next-to-leading order level. This finding confirms that the relationship is robust.
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    Triangular flow in event-by-event ideal hydrodynamics in Au+Au collisions at √SNN = 200A GeV
    (Physical Review C - Nuclear Physics, 2010-11-30) Petersen, H; Qin, GY; Bass, SA; Müller, B
    The first calculation of triangular flow ν3 in Au+Au collisions at √sNN = 200A GeV from an event-by-event (3 + 1) d transport+hydrodynamics hybrid approach is presented. As a response to the initial triangularity Ie{cyrillic, ukrainian}3 of the collision zone, ν3 is computed in a similar way to the standard event-plane analysis for elliptic flow ν2. It is found that the triangular flow exhibits weak centrality dependence and is roughly equal to elliptic flow in most central collisions. We also explore the transverse momentum and rapidity dependence of ν2 and ν3 for charged particles as well as identified particles. We conclude that an event-by-event treatment of the ideal hydrodynamic evolution startingwith realistic initial conditions generates the main features expected for triangular flow. © 2010 The American Physical Society.