In the context of gauge/gravity duals with flavor, we examine heavy-light mesons which involve a heavy and a light quark. For this purpose we embed two D7 brane probes at different positions into the gravity background. We establish the non-Abelian Dirac-Born-Infeld (DBI) action for these probes, in which the U(2) matrix describing the embedding is diagonal. The fluctuations of the brane probes...

Vector mesons are produced copiously in peripheral relativistic heavy-ion collisions. Virtual photons from one ion can fluctuate into quark-antiquark pairs and scatter from the second ion, emerging as vector mesons. The emitter and target are indistinguishable, so emission from the two ions will interfere. Vector mesons have negative parity so the interference is destructive, reducing the produ...

Photoproduction of D± s mesons has been measured in the ZEUS detector at HERA and compared with predictions of NLO pQCD calculations. The ratio of D∗± s to D ∗± cross sections has been compared to results from e+e− experiments. Orbitally excited P-wave charm mesons have been observed in the D∗±π∓ final state. The fraction of D∗± ’s originating from these mesons has been calculated and compared ...

We calculate the partonic cross sections for the hadroproduction of polarized χcJ mesons using the factorization formalism of nonrelativistic QCD. We also describe how the polarization is passed on to the J/ψ mesons in the radiative feed-down χcJ → J/ψ+ γ and in the double-cascade decays of ψ′ mesons via χcJ intermediate states. These represent the missing ingredients needed to predict the pola...

I review a proposed pattern of the light scalar mesons with qq̄ mesons and glueball above 1 GeV and terraquark mesoniums below 1 GeV. Several challenges and caveats of calculating these light scalar mesons with dynamical fermions are discussed.

Mesons are the most fundamental objects allowing a study of quark and gluon con-nement and, more generally, the strong interaction at low energy. The spectroscopy of light mesons is a challenge: the glueballs predicted on the basis of Quantum Chromodynamics are expected amidst the light mesons. However, identifying light mesons and determining their quantum numbers are particularly diicult task...