Our current knowledge about glueballs and hybrid mesons from lattice QCD simulations is briefly reviewed.

New BABAR results on B mesons and quarkonia are presented: an analysis of B+ → X(3872)K+ and B0 → X(3872)K0 decays with X(3872) → J/ψπ+π−, a precise measurement of the B mass difference ΔmB = m(B0)−m(B+) and a study of hadronic transition between Υ mesons. Contributed to the Proceedings of Moriond QCD 2008, 3/08/2008—3/15/2008, La Thuile, Italy SLAC, Stanford Univesity, Stanford, CA 94309

I review the growing theoretical indications that at high densities color SU(3) gauge symmetry is spontaneously broken by the formation of a quark pair condensate. This leads to a rich phase structure for QCD as a function of temperature and chemical potential. I also discuss the prospects for lattice QCD calculations at nite density, including the Glasgow algorithm and imaginary chemical poten...

We calculate the inclusive charmless semileptonic decay width of the B meson using a QCD-based approach. This approach is able to account for both dynamic and kinematic effects of nonperturbative QCD. The charmless semileptonic decay width is found to be enhanced by long-distance strong interactions by +(7± 5)% with respect to the free quark decay width. Using the resulting theoretical value fo...

A new method to construct event-generators based on next-to-leading order QCDmatrixelements and leading-logarithmic parton showers is proposed. Matrix elements of loop diagrams as well as those of a tree level can be generated using an automatic system. A soft/collinear singularity is treated using a leading-log subtraction method. Higher order re-summation of the soft/collinear correction by t...

We review the NLL QCD calculations for the branching ratio of B → Xsγ in the SM. In particular, we emphasize the problem related to the definition of the charm quark mass which leads to a rather large uncertainty of the NLL predictions. The various steps needed for a NNLL calculation, in which the mc issue can be settled, is also sketched. We briefly summarize the results of a calculation of th...

I calculate heavy-light decay constants in a nonrelativistic potential model. The resulting estimate of heavy quark symmetry breaking connicts with similar estimates from lattice QCD. I show that a semirelativistic potential model eliminates the connict. Using the results of heavy quark eeective theory allows me to identify and compensate for shortcomings in the model calculations in addition t...

We discuss the determination of deep-inelastic hadron structure in lattice QCD. By using a fictitious heavy quark, direct calculations of the Compton scattering tensor can be performed in Euclidean space that allow the extraction of the moments of structure functions. This overcomes issues of operator mixing and renormalisation that have so far prohibited lattice computations of higher moments....