21,371 research outputs found
Charmless hadronic B decays and the recent CLEO data
In the light of recent experimental data from the CLEO Collaboration we
study, the decays of B mesons to a pair of pseudoscalar (P) mesons, and a
vector (V) meson and a pseudoscalar meson, in the framework of factorization.
In order to obtain the best fit for the recent CLEO data, we critically examine
the values of several input parameters to which the predictions are sensitive.
These input parameters are the form factors, the strange quark mass, (N_c is the effective number of color), the CKM matrix elements
and in particular, the weak phase . It is possible to give a
satisfactory account of the recent experimental results in and VP
decays, with constrained values of a \emph{single} . We identify the decay
modes in which CP asymmetries are expected to be large.Comment: 24 pages, 11 figures, LaTex; Version to appear in Phys. Rev.
Leptoquark explanation of HERA anomaly in the context of gauge unification
We examine the consequences of leptoquark explanation of HERA anomaly in the
context of R parity conserving supersymmetric gauge unified theory with the
gauge unification scale at GeV. We pointed out the difficulty of
constructing a grandunified theory. However gauge unification is still possible
at GeV when additional multiplets are introduced. We determine
the mass spectrum of these additional fields (fermions and scalars) in gauge
mediated and supergravity scenarios. Unique signatures and mass bounds are
discussed.Comment: 19 pages(Latex), 1 PS Figur
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