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C harmonia formation in QGP PRC 89, 044903 (2014)

C harmonia formation in QGP PRC 89, 044903 (2014). Taesoo Song (Johann Wolfgang Goethe University). M otivation. It takes much longer time for quarkonium to be formed in QGP compared to in vacuum. T. Song, S. H. Lee, and C. M. Ko , PRC 87, 034910 (2013)

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C harmonia formation in QGP PRC 89, 044903 (2014)

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  1. Charmonia formation in QGPPRC 89, 044903 (2014) TaesooSong (Johann Wolfgang Goethe University) Quark Matter 2014

  2. Motivation • It takes much longer time for quarkonium to be formed in QGP compared to in vacuum. T. Song, S. H. Lee, and C. M. Ko, PRC 87, 034910 (2013) • It is not well known nuclear medium effect on quarkonium production before its formation. ? Q quarkonium formation Hard collision Q Quark Matter 2014

  3. Color evaporation model In vauum In QGP Quark Matter 2014

  4. from lattice free energy F(r=∞,T) decreasing with T Eur. Phys. J. C61:811 (2009) Quark Matter 2014

  5. from Langevin equation p dependence of KL and KT from pQCD (anti-)charm distribution in QGP G. Moore, D. Teaney, PRC71, 064904 (2005) diffusion constant D from lQCD H. T. Ding, et al. PRD86, 014509 (2012) Quark Matter 2014

  6. J/Ψ formation time in QGP at formation time in QGP T. Song, C. M. Ko, S. H. Lee, PRC87, 034901 (2013) Quark Matter 2014

  7. Results • Decreasing with T suppresses charomina formation • Softened spectrum, , enhances charmonia formation • As a result, charmonia production is suppressed about by a half. • Considering J/Ψ is the only survived charmonium in QGP, its production is not suppressed in QGP. (50 % of charmonia are J/Ψ in vacuum) • Rather it is enhanced taking into account feed-down effect. () Quark Matter 2014

  8. Summary • Using the color evaporation model, charmonia formation in QGP is calculated. • Charm quark mass decreasing with temperature suppresses the charmonium formation. • The invariant mass of pair which decreases in QGP due to scattering enhances the charmonium formation. • As a result, charmoniumproduction is suppressed by a half in QGP. • However, J/Ψ production is not suppressed, because it is the only survived charmonium in QGP, and rather enhanced considering the feed-down effect. Quark Matter 2014

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