${\rm Y}(1S)$ transverse momentum spectra through dissociation and regeneration in heavy ion collisions

Abstract

We calculate the transition between a quarkonium state and an unbound heavy quark-antiquark pair through gluo-dissociation and inelastic parton scattering using a partonic picture that interpolates between the formal limits based on potential nonrelativistic QCD (pNRQCD) at different temperatures. While the thermal width increases with momentum and temperature, the quarkonium regeneration is affected by the heavy quark distribution function which depends on the diffusion constant. By solving the Boltzmann equation with the dissociation and regeneration terms, we investigate the medium modifications of quarkonium momentum spectra. Our numerical results indicate that the ${\rm Y}(1S)$ $R_{AA}$ at high transverse momentum are influenced by the regeneration effects depending on the heavy quark diffusion. In this picture, the published CMS data that show an almost transverse momentum independence can be explained by the interplay between the suppression by dissociation and enhancement by regeneration at low and high transverse momenta, respectively. With the same input, we also calculate the transverse momentum dependence of the ${\rm Y}(1S)$ $v_2$ and show that it lies within the limits of the available data.

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Cited by in corpus (10)

• Coupled Boltzmann Transport Equations of Heavy Quarks and Quarkonia in Quark-Gluon Plasma
• Quantum evolution of quarkonia with correlated and uncorrelated noise
• Measurement of the azimuthal anisotropy of ${\rm Y}$(1S) and ${\rm Y}$(2S) mesons in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• QCD Challenges from pp to A-A Collisions
• Prospects for quarkonium studies at the high-luminosity LHC
• Fireball tomography from bottomonia elliptic flow in relativistic heavy-ion collisions
• The impact of fluctuating initial conditions on bottomonium suppression in 5.02 TeV heavy-ion collisions
• Model study on ${\rm Y}(nS)$ modification in small collision systems
• Energy loss of heavy quarkonia in hot QCD plasmas
• Transport coefficients of heavy quarkonia comparing with heavy quark coefficients