Enhanced heavy quark-pair production in strong SU(2) color field

Abstract

Non-perturbative charm and bottom quark-pair production is investigated in the early stage of heavy ion collisions. Following our earlier works, the time-dependent study is based on a kinetic description of fermion-pair production in strong non-Abelian fields. We introduce time-dependent chromo-electric external field with a pulse-like time evolution, which simulates the overlap of two colliding heavy ions. The calculations is performed in a SU(2) color model with finite current quark masses. Yields of heavy quark-pairs are compared to the ones of light and strange quark-pairs. We show that the small inverse duration time of the field pulse determines the efficiency of the quark-pair production. Thus we do not see the expected suppression for heavy quark production, as follows from the Schwinger formula for constant field, but rather an enhanced heavy quark production at ultrarelativistic energies. We convert pulse duration time-dependent results into collisional energy dependence and introduce flavour-dependent energy string tensions, which can be used in string based model calculations at RHIC and LHC energies.

11 pages, 9 figures

References in corpus (13)

• Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Some Features of the Glasma
• Measurement of high-p_T Single Electrons from Heavy-Flavor Decays in p+p Collisions at sqrt(s) = 200 GeV
• Heavy flavor in heavy-ion collisions at RHIC and RHIC II
• Particle production in field theories coupled to strong external sources. II: Generating functions
• Multiparticle correlations in the Schwinger mechanism
• Transient field fluctuations effects in d+Au and Au+Au collisions at \sqrt{s_nn} = 200 GeV
• Transverse and longitudinal momentum spectra of fermions produced in strong SU(2) fields
• Soft Open Charm Production in Heavy-Ion Collisions
• Backreaction and Particle Production in (3+1)-dimensional QED
• Fermion particle production in semi-classical Boltzmann-Vlasov transport theory
• Strange hadron yields and ratios in heavy ion collisions at RHIC energy
• Strange hadron ratios from quark coalescence at RHIC and LHC

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• Finite pulse effects on $e^{+}{e}^{-}$ pair creation from strong electric fields
• Hyperon/meson ratios in rare high-multiplicity $pp$ collisions at energies available at the Large Hadron Collider, and potential signatures for mini-quark-gluon plasma formation
• Klein-Gordon Equation in Hydrodynamical Form
• Quark and Gluon Production from a Boost-invariantly Expanding Color Electric Field
• Open Charm Production in $p+p$ and Pb + Pb collisions at the CERN Large Hadron Collider
• Chiral Magnetic Effect in the Dirac-Heisenberg-Wigner formalism
• Multiplicity dependent $p_T$ distributions of identified particles in pp collisions at 7 TeV within HIJING/$B\bar{B}$ v2.0 model