quarkonium 1S spectrum in large-β0 approximation and renormalon cancellation

O ( α 5 S m ) quarkonium 1 S spectrum in large - β 0 approximation and renormalon cancellation

Quarkonium Production at Z and in Υ(1s) Decay

The conventional color-singlet model was challenged by the recent data on quarkonium production. Discrepancies in production rates were observed at the Tevatron, at LEP, and in fixed-target experiments. The newly advocated color-octet mechanism provides a plausible solution to the anomalous quarkonium production observed at the Tevatron. The color-octet mechanism should also affect other quarko...

Perturbative QCD Potential, Renormalon Cancellation and Phenomenological Potentials

We examine the total energy Etot(r) = 2mpole + VQCD(r) of the bb̄ system within perturbative QCD up to O(αS). We extend a previous analysis by incorporating effects of the non-zero charm-quark mass in loops. We find that, once the renormalon cancellation is performed, Etot(r) agrees well with typical phenomenological potentials for heavy quarkonia at distances 0.5 GeV ∼ r ∼ 3 GeV. We also examin...

Determination of the b-mass using renormalon cancellation

Methods of Borel integration to calculate the binding ground energies and mass of bb̄ quarkonia are presented. The methods take into account the leading infrared renormalon structure of the ”soft” binding energy E(s) and of the quark pole masses mq , and the property that the contributions of these singularities in M(s) = 2mq +E(s) cancel. The resummation formalisms are applied to quantities whi...

meson and the light - heavy quarkonium spectrum

We compute the c ¯ b spectrum from a first principle Salpeter equation obtained in a preceding paper. For comparison we report also the heavy-light quarko-nium spectrum and the hyperfine separations previously presented only in a graphical form. Notice that all results are parameter free. The spectrum and properties of the c ¯ b systems have been calculated various times in the past in the fram...