Impact of Glasma on heavy quark observables in nucleus-nucleus collisions at LHC

Sun, Yifeng; Coci, Gabriele; Das, Santosh K.; Plumari, Salvatore; Ruggieri, Marco; Greco, V.

doi:10.1016/j.physletb.2019.134933

Cited by 59 publications

(42 citation statements)

References 62 publications

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“…In this section we present the basic formalism which we use to compute transverse momentum broadening of highly relativistic test particles as they traverse the glasma. The methods we use are largely based on the definition of momentum broadening via a lightlike Wilson loop [22][23][24] and, equivalently, the dynamics of classical colored particles [25][26][27][28][29]. We review these approaches and derive a gauge invariant expression for transverse momentum broadening of an ultrarelativistic colored particle.…”

Section: Basic Formalismmentioning

confidence: 99%

Anisotropic momentum broadening in the 2+1D glasma: Analytic weak field approximation and lattice simulations

2020

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In heavy ion collisions, transverse momentum broadening quantifies the modification of a hard probe due to interactions with the quark-gluon plasma (QGP). We calculate momentum broadening in the glasma, which is the highly nonisotropic precursor stage of the QGP right after the collision. We show that the glasma leads to anisotropic momentum broadening: high energy partons accumulate more momentum along the beam axis than transverse to it. The physical origin of anisotropic broadening can be traced back to differences in the shapes of chromoelectric and chromomagnetic flux tubes in the glasma. We provide semianalytic results for momentum broadening in the dilute glasma and numerical results from real-time lattice simulations of the nonperturbative dense glasma.

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Section: Basic Formalismmentioning

confidence: 99%

Anisotropic momentum broadening in the 2+1D glasma: Analytic weak field approximation and lattice simulations

2020

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“…Unlike e.g. in [68][69][70][71] we do not explicitly follow the motion of the quarks or quarkonia in the color field.…”

Section: Introductionmentioning

confidence: 99%

Heavy quark diffusion in an overoccupied gluon plasma

Boguslavski

Kurkela

Lappi

et al. 2020

J. High Energ. Phys.

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We extract the heavy-quark diffusion coefficient κ and the resulting momentum broadening 〈p2〉 in a far-from-equilibrium non-Abelian plasma. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of 〈p2〉, followed by linear growth with time due to Langevin-type dynamics and damped oscillations around this growth at the plasmon frequency. We show that these novel oscillations are not easily explained using perturbative techniques but result from an excess of gluons at low momenta. These oscillation are therefore a gauge invariant confirmation of the infrared enhancement we had previously observed in gauge-fixed correlation functions. We argue that the kinetic theory description of such systems becomes less reliable in the presence of this IR enhancement.

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“…The QPM approach accounts for the nonperturbative dynamics by T −dependent quasi-particle masses, with m 2 q = 1/3g 2 (T )T 2 and m 2 g = 3/4g 2 (T )T 2 , plus a T −dependent background field known as a bag constant, with g(T ) tuned to fit the thermodynamics of the lattice QCD [51,52]. This approach has been shown to lead to a good description of the experimental data for both R A A ( p T ) and v 2 of charmed and bottomed mesons, both at RHIC and LHC employing an enhancement factor K ∼ 2 of the drag and diffusion coefficients [53][54][55].…”

Section: Numerical Resultsmentioning

confidence: 99%

The signature of charge dependent directed flow observables by electromagnetic fields in heavy ion collisions

2021

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We discuss the generation of the directed flow $$v_1(p_T,y_z)$$ v 1 ( p T , y z ) induced by the electromagnetic field as a function of $$p_T$$ p T and $$y_z$$ y z . Despite the complex dynamics of charged particles due to strong interactions generating several anisotropies in the azimuthal angle, it is possible at $$p_T > m$$ p T > m to directly correlate the splitting in $$v_1$$ v 1 of heavy quarks with different charges to some main features of the magnetic field, and in particular its values at formation and freeze-out time. We further found that the slope of the splitting $$d\Delta v_1/dy_z|_{y_z=0}$$ d Δ v 1 / d y z | y z = 0 of positively and negatively charged particles at high $$p_T$$ p T can be formulated as $$d\Delta v_1/dy_z|_{y_z=0}=-\alpha \frac{\partial \ln f}{\partial p_T}+\frac{2\alpha -\beta }{p_T}$$ d Δ v 1 / d y z | y z = 0 = - α ∂ ln f ∂ p T + 2 α - β p T , where f is the $$p_T$$ p T spectra of the charged particles and the constants $$\alpha $$ α and $$\beta $$ β (order of MeV) are constrained by the y component of magnetic fields and the sign of $$\alpha $$ α is simply determined by the difference $$\Delta [tB_y(t)]$$ Δ [ t B y ( t ) ] in the center of colliding systems at the formation time of particles and at the time when particles leave the effective range of electromagnetic fields or freeze out. The formula is derived from general considerations and is confirmed by several related numerical simulations; it supplies a useful guide to quantify the effect of different magnetic field configurations and provides an evidence of why the measurement of $$\Delta v_1$$ Δ v 1 of charm, bottom and leptons from $$Z^0$$ Z 0 decay and their correlations are a powerful probe of the initial e.m. fields in ultra-relativistic collisions.

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Impact of Glasma on heavy quark observables in nucleus-nucleus collisions at LHC

Cited by 59 publications

References 62 publications

Anisotropic momentum broadening in the 2+1D glasma: Analytic weak field approximation and lattice simulations

Anisotropic momentum broadening in the 2+1D glasma: Analytic weak field approximation and lattice simulations

Heavy quark diffusion in an overoccupied gluon plasma

The signature of charge dependent directed flow observables by electromagnetic fields in heavy ion collisions

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