J. Milke”*, T. Antonib, W.D. Apela, F. Badea bt, K. Bekk”, A. Bercuciat, H. Bliimerab, H. Bozdog”, I.M. Branc&, C. Biittnerb, A. Chilingarian d, K. Daumillerb, P. Dolla, J. Englera, F. Fefilerb, H.J. Gils”, R. Glasstetterb, R. Haeuslerb, A. Haungsa, D. Hecka, J.R. Harandelb, A. Iwanbt, K.-H. Kampertba, H.O. Klagesa, G. Maiera, H.J. Mathesa, H.J. Mayera, M. Millera, R. Obenlanda, 3. OehlschlSger...

Motivated by the recent lattice data that J/ψ will survive up to 1.6Tc, we calculate the thermal width of J/ψ at finite temperature in perturbative QCD. The inputs of the calculation are the parton quarkonium dissociation cross sections at the NLO in QCD, which were previously obtained by Song and Lee, and a gaussian charmonium wave function, whose size were fitted to an estimate by Wong by sol...

Abstract In the past twenty years, hadron spectroscopy has made immense progress. Experimental facilities have observed different multiquark states during these years. There are models and phenomenological potentials to study nature of interquark interaction. this work, we reviewed quark used in spectroscopy.

The non-perturbative parton distributions in hadrons are derived from simple physical arguments resulting in an analytical expression for the valence parton distributions. The sea partons arise mainly from pions in hadronic fluctuations. The model gives new insights and a good description of structure function data. Hard processes involving hadrons are calculated by folding perturbative QCD mat...