We discuss the two and three particle light-cone distribution amplitudes (DAs) of pseudoscalar nonsinglet mesons of twist 3 and 4. Using nonlocal operator identities and conformal expansion, we derive closed expressions for several DAs. We also include meson-mass corrections which prove to be dominant in the twist 4 DAs of K and η mesons. Explicit parametrizations for the DAs of π, K and η meso...

We present results of a 2+1+1 flavor twisted mass lattice QCD computation of the spectrum of D mesons and Ds mesons and of charmonium. Particular focus is put on the positive parity D states (so-called D∗∗ mesons) with quantum numbers JP = 0+, 1+ and 2+. Besides computing their masses we are also separating and classifying the two JP = 1 states according to the angular momentum/spin of their li...

Glueballs remain an experimentally undiscovered expectation of QCD. Lattice QCD (As well as other theoretical approaches) predicts a spectrum glueballs, with the tensor (${J}^{PC}={2}^{++}$) glueball being second lightest, behind scalar glueball. Here, using chiral hadronic model, we compute decay ratios into various meson channels. We find to primarily two vector mesons, dominated by $\ensurem...

Effective Chiral Lagrangian is derived from QCD in the framework of Field Correlator Method. It contains the effects of both confinement and chiral symmetry breaking due to a special structure of the resulting quark mass operator. It is shown that this Lagrangian describes light pseudoscalar mesons, and Gell-Mann-OakesRenner relations for pions, eta and K mesons are reproduced. Spectrum of radi...

Exotic and higher spin (> 1) mesons are still not throughly investigated in lattice QCD. Using a set of derivative based operators we report our exploratory study of these mesons in charmonium region. We use a 123 × 48 anisotropic (ξ = 3) clover lattice with inverse temporal lattice spacing a−1 = 6.05 GeV. Techniques developed in this exploratory study will be utilized in our future comprehensi...

We discuss exclusive decays of large spin mesons into mesons in models of large Nc quenched QCD at strong coupling using string theory. The rate of the processes are calculated by studying the splitting of a macroscopic string on the relevant dual gravity backgrounds. We study analytic formulas for the decay rates of mesons made up of very heavy or very light quarks. e-mails: [email protected]...