A knowledge of the radial distributions of quarks inside hadrons could lead to a better understanding of the QCD description of these hadrons and possibly suggest forms for phenomenological models. As a step in this direction, we have measured the charge (vector) and matter (scalar) densities of a heavy-light meson. More explicitly, the heavy-light meson is simplified to being an infinitely hea...

We develop a bottom-up approach to constructing a theory of fermion masses and mixing angles based on the gauge group SU(3) × G where SU(3) is a family symmetry and G contains a unified group such as SO(10) or its Pati-Salam subgroup, together with other discrete symmetries. We construct a realistic model and show that it can provide an excellent description of quark and lepton masses and mixin...

We study the dynamics of a ‘composite’ or ‘dressed’ quark in stronglycoupled large-Nc N = 4 super-Yang-Mills, making use of the AdS/CFT correspondence. We show that the standard string dynamics nicely captures the physics of the quark and its surrounding non-Abelian field configuration, making it possible to derive a relativistic equation of motion that incorporates the effects of radiation dam...

Locally Weighted Learning is a class of function approximation techniques, where a prediction is done by using an approximated local model around the current point of interest. This paper gives an general overview on the topic and shows two different solution algorithms. Finally some successful applications of LWL in the field of Robot Learning are presented.

We calculate the next-to-leading corrections to the jet vertex which is relevant for the Mueller-Navelet-jets production in pp̄ collisions and for the forward jet cross section in ep collisions. In this first part we present the results of the vertex for an incoming quark. Particular emphasis is given to the separation of the collinear divergent part and the central region of the produced gluon.

The implications of the positivity constraint, |g γ(P 2) 1 (x,Q 2)| ≤ F γ(P 2) 1 (x,Q 2), on the presently unknown spin–dependent structure function g γ(P 2) 1 (x,Q 2) of real and virtual photons are studied at scales Q2 ≫ P 2 where longitudinally polarized photons dominate physically relevant cross sections. In particular it is shown how to implement the physical constraints of positivity and ...

Recent development of the universal seesaw mass matrix model is reviewed. The model was proposed in order to explain why quark and lepton masses are so small compared with the electroweak scale ΛL = 〈φL〉 = 174 GeV. However, the recently observed top-quark mass mt ≃ 180 GeV seems to make an objection against the seesaw mass picture. For this problem, it has recently pointed out that the seesaw m...

We compute the inclusive decay rates b → D − s (D * − s)c including lowest order QCD corrections on the quark legs, and compare with existing CLEO data. Unlike the short distance QCD corrections, that are of higher order, these corrections are of order α s. In the on-shell renormalization scheme and for α s (m b) ∼ = 0.2 we find a correction of −10 % to the inclusive rate computed using factori...

We propose an extended Nambu–Jona-Lasinio model to include the heavy mesons with the heavy quark symmetry. The quark current-current interaction is generalized to include the heavy quark currents. In order to comply with the heavy quark spin symmetry at the heavy quark limit, the quark mass dependence of the interaction strength is introduced. The light and heavy pseudo-scalar and vector meson,...

We study the dynamics of a ‘composite’ or ‘dressed’ quark in stronglycoupled large-Nc N = 4 super-Yang-Mills, making use of the AdS/CFT correspondence. We show that the standard string dynamics nicely captures the physics of the quark and its surrounding non-Abelian field configuration, making it possible to derive a relativistic equation of motion that incorporates the effects of radiation dam...