Quarkonium with Effective Field Theories

Nora Brambilla (TU Munich)
DESY Auditorium, 16.45 h

Quantum Chromodynamics (QCD) is the sector of the Standard Model of
particle physics that describes the strong interaction, deceptively simple
to formulate but notoriously difficult to solve.
Heavy quarkonium is a multiscale system that probes the different energy
regimes of QCD, from the high-energy region, where an expansion in the
coupling constant is possible and precision studies may be done, to the
low-energy region, dominated by confinement and the many manifestations of
the nonperturbative strong dynamics. Properties of production and
absorption of quarkonium in a nuclear medium are also crucial for the
study of QCD at high density and temperature.
On the theoretical side, the construction of new nonrelativistic effective
field theories for quarkonium has recently revolutionized the field
providing both a conceptual framework and a powerful calculational tool.
The effective field theory approach provides a clean separation and a
systematic treatment of all the individual scales relevant to the
system, thereby decoupling the strongly coupled dynamics and pinpointing
the relevant degrees of freedom.
On the experimental side, the diversity, quantity and accuracy of the
data collected in the last few years is
impressive and includes huge samples of quarkonia at tau-charm and B
factories, hadroproduction at Fermilab, production in photon-gluon fusion
at DESY, heavy ion production at RHIC and SPS, featuring the observation
of many new states and new unexpected processes. More will come in the
near future from LHC, tau-charm factories and Panda at FAIR.
   I will discuss these theoretical and experimental advancements and their
implications for our understanding of strong interactions.

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