A bstract We compute the proper real-time interaction potential between a static quark and antiquark in classical lattice gauge theory at finite temperature. Our central result is determination of screened real-part this potential, we reconfirm presence an imaginary part. The real part intimately related to back-reaction sources onto fields, incorporated via Gauss’s law. Differences treatment q...

The mass modifications of the open charm ([Formula: see text] and [Formula: text]) mesons, their effects on decay widths as well charmonium state, to mesons text]), are investigated in presence strong magnetic fields. These studied accounting for mixing pseudoscalar vector text], mixings), with parameter, a phenomenological three-point vertex interaction determined from observed radiative width...

Taking into account the effect of final state interaction, we calculate the non-zero (näive) T -odd transverse momentum dependent distribution h1 (x,k 2 ⊥) of the pion in a quark-spectator-antiquark model with effective pion-quark-antiquark coupling as a dipole form factor. Using the model result we estimate the cos 2φ asymmetries in the unpolarized πN Drell-Yan process which can be expressed a...

We investigate the interaction between a heavy quark-antiquark pair in color octet configuration gluon plasma. calculate nonperturbatively an effective thermal potential for such through study of correlation function hybrid state with $Q \bar{Q}$ and adjoint source static limit. discuss extraction potential, present results plasma moderately high temperatures $\lesssim 2 T_c$. The implications ...

We summarize recent results on the nonperturbative quark-gluon interaction in Landau gauge QCD. Our analytical analysis of the infrared behaviour of the quark-gluon vertex reveals infrared singularities, which lead to an infrared divergent running coupling and a linear rising quark-antiquark potential when chiral symmetry is broken. In the chirally symmetric case we find an infrared fixed point...

In reference to the recently observed high Q, large x events in deep-inelastic positron–proton scattering at HERA, various leptoquark and supersymmetric scenarios are discussed. We study the impact of virtual leptoquark or R-parity breaking squark exchange as well as generic contact interaction on the production of quark–antiquark pairs in ee annihilation, in particular at LEP2. ∗ Supported by ...

In this talk I give a short summary of the basics of conventional and exotic meson spectroscopy, and consider in particular those issues in the charmonium and charmonium hybrid sectors which can be addressed by a future antiproton facility at GSI. 1 QCD and Confinement The QCD lagrangian describes the strong interaction in terms of the couplings between the elementary pointlike quark (antiquark...