Speaker
Prof.
Bernd Kniehl
(II. Inst. f. Theor. Phys., Univ. Hamburg)
Description
We review the present landscape of heavy-quarkonium theory, its tests
by worldwide collider and fixed-target experiments, and the future
perspectives offered by the LHC. Special emphasis is placed on the
effective quantum field theory of nonrelativistic QCD (NRQCD), endowed
with the factorization theorem conjectured by Bodwin, Braaten, and Lepage,
which arguably constitutes the most probable candidate theory at the
present time. Being impressively consolidated at the next-to-leading
order by the world's data on unpolarized J/psi production, NRQCD
factorization has now reached the crossroads because the predicted
universality of the long-distance matrix elements is challenged by
recent measurements of J/psi polarization and eta_c yield.
Primary author
Prof.
Bernd Kniehl
(II. Inst. f. Theor. Phys., Univ. Hamburg)
