We discuss the onset of the dominance of the Glauber-GribovLandshoff (GGL) component of pQCD hard two-gluon (2G) exchange contribution to hard elastic ππ scattering at moderate energies . Such a hard ππ scattering could via final state interaction on the γγ → π+π− reaction in which pQCD quark-exchange contribution is known to be short of strength. While in the nonrelativistic approximation the ...

We construct an effective Lagrangian describing the interaction of soft pions and kaons with mesons containing a heavy quark and light degrees of freedom in an orbital p wave. The formalism is easily extended to heavy mesons and baryons in arbitrary excited states. We calculate the leading contributions to the strong decays D∗ 2 → Dπ, D∗ 2 → D∗π and D1 → D∗π. We confirm the relations between th...

Interactions in coupled channels ππ, KK̄ and an effective 2π2π in scalar-isoscalar wave have been analysed. Influence of interchannel couplings on analytical structure of multichannel interaction amplitudes has been studied. Interplay of S-matrix zeroes and poles and their relation with parameters of scalar resonances has been investigated. PACS numbers: 11.80.Gw, 13.60.Le, 13.75.Lb, 14.40.Cs St...

The significance of final-state interactions inBd → ππ decays is quantitatively demonstrated by taking elastic ππ ⇀↽ ππ and inelastic ππ ⇀↽ DD̄ rescattering effects into consideration. We find that the present experimental data on B d → ππ can well be understood in this approach without fine-tuning of the input parameters, and large CP-violating asymmetries are expected to manifest themselves in...

The significance of final-state interactions in Bd → ππ decays is phenomenologically demonstrated by taking elastic ππ ⇀↽ ππ and inelastic ππ ⇀↽ DD̄ rescattering effects into consideration. We find that the present experimental data on B d → ππ can well be understood in this approach without fine-tuning of the input parameters, and large CP-violating asymmetries are expected to manifest themselv...

A qualitative and quantitative energetic and structural study of dibenzyl ketone (DBK) and benzyl ethyl ketone (BEK) was carried out in order to obtain insights into the type and magnitude of aromatic interactions that these systems present in their different phases. The crystal structure of DBK was obtained by X-ray crystallography, and it shows that the conformation adopted in the crystalline...

I review the ways that have been proposed to measure the quark transversity distribution in the nucleon. I then explain a proposal, developed by Xuemin Jin, Jian Tang and myself, to measure transversity through the final state interaction between two mesons (ππ, KK, or πK) produced in the current fragmentation region in deep inelastic scattering on a transversely polarized nucleon.

Properties and temperature behavior of π and σ bound states are studied in the framework of the nonlocal model with a separable interaction kernel based on the quark Dyson-Schwinger and the meson Bethe-Salpeter equations. Mπ(T ), fπ(T ), Mσ(T ) and Γσ→ππ(T ) are considered above and below the deconfinement and chiral restoration transitions.