Gluon mediated exclusive hadronic decays of b quarks are studied within the standard model ~SM! and the constrained minimally supersymmetric standard model ~MSSM!. For all allowed regions of the MSSM parameter space (A , tan b ,m0 ,m1/2) the penguin magnetic dipole form factor F2 R is dominant over the electric monopole and can be larger than the magnetic dipole form factor of the SM. However, ...

Gluon mediated exclusive hadronic decays of b quarks are studied within the standard model (SM) and the constrained minimally supersymmetric standard model (MSSM). For all allowed regions of the MSSM parameter space (A, tan β, m 0 , m 1/2) the penguin magnetic dipole form factor F R 2 is dominant over the electric dipole and can be larger than the magnetic dipole form factor of the SM. However,...

For a graph $G = (V, E)$, a partition $pi = {V_1,$ $V_2,$ $ldots,$ $V_k}$ of the vertex set $V$ is an textit{upper domatic partition} if $V_i$ dominates $V_j$ or $V_j$ dominates $V_i$ or both for every $V_i, V_j in pi$, whenever $i neq j$. The textit{upper domatic number} $D(G)$ is the maximum order of an upper domatic partition. We study the properties of upper domatic number and propose an up...

We investigate two high energy radiation mechanisms, the proton synchrotron and the electron inverse Compton emission, and explore their possible signatures in the broad-band spectra and in the keV to GeV light curves of gamma-ray burst afterglows. We develop a simple analytical approach, allowing also for the effects of photon-photon pair production, and explore the conditions under which one ...

This paper deals with computing topological invariants such as connected components, boundary surface genus, and homology groups. For each input data set, we have designed or implemented algorithms to calculate connected components, boundary surfaces and their genus, and homology groups. Due to the fact that genus calculation dominates the entire task for 3D object in 3D space, in this paper, w...