Particle Production in Strong Electromagnetic Fields in Relativistic Heavy-Ion Collisions

Tuchin, Kirill

doi:10.1155/2013/490495

Cited by 439 publications

(471 citation statements)

References 106 publications

(156 reference statements)

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“…The conductivity of the quark-gluon plasma slows the decay of the magnetic field, delaying the decay of the magnetic field in the plasma to long after the spectators are gone. Reliable estimates here also await a future magnetohydrodynamic analysis of heavy ion collisions, but perhaps | B| can remain as large as (0.1 GeV) 2 for a few fm/c [85][86][87][88], although this is more likely to be an overestimate than an underestimate.…”

Section: Jhep10(2015)018mentioning

confidence: 91%

Chiral drag force

Rajagopal

Sadofyev

2015

J. High Energ. Phys.

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Abstract:We provide a holographic evaluation of novel contributions to the drag force acting on a heavy quark moving through strongly interacting plasma. The new contributions are chiral in the sense that they act in opposite directions in plasmas containing an excess of left-or right-handed quarks. The new contributions are proportional to the coefficient of the axial anomaly, and in this sense also are chiral. These new contributions to the drag force act either parallel to or antiparallel to an external magnetic field or to the vorticity of the fluid plasma. In all these respects, these contributions to the drag force felt by a heavy quark are analogous to the chiral magnetic effect (CME) on light quarks. However, the new contribution to the drag force is independent of the electric charge of the heavy quark and is the same for heavy quarks and antiquarks, meaning that these novel effects do not in fact contribute to the CME current. We show that although the chiral drag force can be non-vanishing for heavy quarks that are at rest in the local fluid rest frame, it does vanish for heavy quarks that are at rest in a suitably chosen frame. In this frame, the heavy quark at rest sees counterpropagating momentum and charge currents, both proportional to the axial anomaly coefficient, but feels no drag force. This provides strong concrete evidence for the absence of dissipation in chiral transport, something that has been predicted previously via consideration of symmetries. Along the way to our principal results, we provide a general calculation of the corrections to the drag force due to the presence of gradients in the flowing fluid in the presence of a nonzero chemical potential. We close with a consequence of our result that is at least in principle observable in heavy ion collisions, namely an anticorrelation between the direction of the CME current for light quarks in a given event and the direction of the kick given to the momentum of all the heavy quarks and antiquarks in that event.

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Section: Jhep10(2015)018mentioning

confidence: 91%

Chiral drag force

Rajagopal

Sadofyev

2015

J. High Energ. Phys.

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“…However the presence of electrical charges (such as the quarks in the QGP) means there is finite electrical conductivity. By Lenz's law the change in magnetic field is opposed by the charge carriers in the conductor, so the temporal decay of the magnetic field is significantly slowed [18,19].…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions atsNN=2.76TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

Phys. Rev. C

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We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the mean charge of the particles and their pseudorapidity separation. We argue that this differential correlator is better suited to distinguish the differences in positive and negative charges expected due to the CMW and the background effects, such as local charge conservation coupled with strong radial and anisotropic flow.

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“…Since m 2 H ≫ eB in both scenarios explored on the OPE side, in this paper we expand the charged pseudoscalar propagator in powers of eB=m 2 H in the phenomenological part of the QCDSR. Given that magnetic fields of the order eB ∼ m 2 π [2, 3,35,36] are the most relevant for the study of heavy ion collisions at RHIC and LHC, in Ref. [37] the calculations presented in this paper will be generalized to consider effects from magnetic fields of arbitrary strength.…”

Section: E the Phenomenological Sidementioning

confidence: 99%

Modification of theBmeson mass in a magnetic field from QCD sum rules

et al. 2014

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In this paper, we extend the well-known QCD sum rules used in the calculation of the mass of heavy mesons to estimate the modification of the charged B-meson mass, m B , in the presence of an external Abelian magnetic field, eB. Two simplifying limits were considered: the weak field limit, in which the external field satisfies eB ≪ m 2 (with m being any of the masses involved); and the strong field limit, in which the field strength is small in comparison to the bottom quark mass (or the B-meson mass) squared, but it is large compared to the mass of the light quarks, i.e., m 2 u;d ≪ eB ≪ m 2 b;B . We found that m B decreases with the magnetic field in both of these limits.

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Particle Production in Strong Electromagnetic Fields in Relativistic Heavy-Ion Collisions

Cited by 439 publications

References 106 publications

Chiral drag force

Chiral drag force

Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions atsNN=2.76TeV

Modification of theBmeson mass in a magnetic field from QCD sum rules

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