A model in which the soft collisions of the nucleon are described in terms of interactions of its two constituents (a quark and a diquark) is proposed. When adjusted to describe precisely the elastic proton-proton scattering data and supplemented with the idea of wounded constituents, the model accounts rather well for the centrality dependence of particle production in the central rapidity reg...

A general formalism, based on factorization theorem and pQCD hard interactions, is developed for the description of single spin effects in hadron-hadron inclusive processes. The transverse momentum, k⊥, of the quarks inside the hadrons and of the hadrons relatively to the fragmenting quark, is taken into account in distribution and fragmentation functions, and leads to possible non zero single ...

We employ the relativistic constituent quark model to give a unified description of the leptonic and semileptonic decays of pseudoscalar mesons (π, K, D, Ds, B, Bs). The calculated leptonic decay constants and form factors are found to be in good agreement with available experimental data and other approaches. We reproduce the results of spin-flavor symmetry in the heavy quark limit.

Heavy quark and direct photon production in hadronic collisions are processes of great interest. The discovery of the top has increased efforts in the calculation of heavy quark production cross sections while direct photon production is important for determinations of gluon distributions. Near threshold for the production of the final state in these processes one can resum logarithmic correcti...

ast week, member states of the World Health Organization (WHO) advanced another step in the nearly 1-year rigorous process of selecting its next director-general. Candidates for the position presented their vision of international health work and the role of this global health body. Having worked at WHO in a number of capacities in the area of infectious diseases, I know well that international...

the most important factor in donor-recipient matching for hematopoietic stem cell transplantation is their hla typing. for many patients, we can not find a full-matched donor. in high risk patients, one locus  mismatched related donors are suitable alternatives. (1, 2) since the matching of patients and their siblings usually is based on low resolution hla typing, the matching of one locus mism...

what counts as wise? Second, does the public, after considerable thought, think that our society has a moral obligation to pursue lines of research which may benefit present and future generations? I say “moral obligation” because it is sometimes implied by advocates of recombinant D N A research that science would be guilty of a sin of omission if it did not continue and promote research so pr...

The alternative to the standard formulation of the quark-parton model is proposed. Our approach is based on the solution of the master equations relating the structure and distribution functions, which consistently takes into account the intrinsic quark motion in contradistinction to the standard infinite momentum approach, in which this motion is latently suppressed. The model well reproduces ...

The addition of an Abelian family symmetry to the Minimal Supersymmetric Standard Model reproduces the observed hierarchies of quark and lepton masses and quark mixing angles, only if it is anomalous. Green-Schwarz compensation of its anomalies requires the electroweak mixing angle to be sin2 θw = 3/8 at the string scale, without any assumed GUT structure, suggesting a superstring origin for th...