Hadron phenomenology and QCD Coulomb gauge formulation theory

por Felipe J. Llanes Estrada (Universidad Complutense)

martes 15 jun. 2010 10:00 → 11:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

An important application of the conceptual framework is the possibility of employing the Franck-Condon principle of molecular physics to study decays of quarkonium above open-flavor threshold. Since the velocity of the decay mesons tracks the velocity of the initial state quarks, the pattern of decays is a window to the structure of the parent hadron. This is illustrated by recent Belle data on the Upsilon(5s). Another application is our suggestion of employing the excited baryon spectrum (particularly maximum-J Delta resonances) to learn about the running of the quark mass through the mid-momentum regime. This is accomplished thanks to the insensitivity to chiral symmetry breaking high in the spectrum: QCD can have at the same time chiral symmetry realized in Goldstone mode (low-lying spectrum) and Wigner mode (high spectrum) and the transition between both depends on how fast the effective quark mass falls with momentum.