A Study of Charmonium Systems across the Deconfinement Transition.pdfVIP

1 BI-TP 2002/19, DESY 02-108 A Study of Charmonium Systems across the Deconfinement Transition ∗ a† a a b Saumen Datta , Frithjof Karsch , Peter Petreczky and Ines Wetzorke aFakult¨at f¨ur Physik, Universit¨at Bielefeld, D33615 Bielefeld, Germany. bNIC/DESY Zeuthen, Platanenallee 6, D-15738 Zeuthen, Germany. 2 0 0 We present results from lattice studies of charmonium systems near the deconfinement transition temperature. 2 On quenched isotropic lattices with lattice spacings between 0.02 and 0.05 fm, qq¯ systems with quark masses g close to the charm mass and with different spin-parity quantum numbers are studied in the temperature range 0.9T −3T . Results for temporal correlators of local operators, and the spectral functions constructed from them, u c c A are discussed. For the pseudoscalar and vector channels, the correlators are observed to change very little across the deconfinement transition, unlike in the case of the light quarks. 7 1 v 2 The behavior of charmonia across the decon- smeared operators is not a good idea since it can 1 finement transition has been a subject of consid- mimick bound states [3]. We therefore use point- 0 erable interest ever since the breakthrough paper to-point correlators, and study the temporal cor- 8 of Matsui and Satz [1]. Unlike light mesons, relators, Eq. (1), with JH = cc,¯ cγ¯ 5c, cγ¯ µc 0 charmonia may exist as bound states even after and cγ