نتایج جستجو برای: gluonic penguin
تعداد نتایج: 3056 فیلتر نتایج به سال:
The gluonic pole has been instrumental in explaining the mass of the η ′ and providing a plausible explanation for solving the spin crisis. We show that it also plays an important role in the description of the photoproduction of vector mesons at high momentum transfers at JLab energies. Recently the CLAS Collaboration at JLab has published new data on ρ-and φ-meson photoproduction at large mom...
We study the excited-state potential and the gluonic excitation in the static three-quark (3Q) system using SU(3) lattice QCD with 16 × 32 at β=5.8 and 6.0 at the quenched level. For about 100 different patterns of spatially-fixed 3Q systems, we accurately extract the excited-state potential V e.s. 3Q together with the ground-state potential V g.s. 3Q by diagonalizing the QCD Hamiltonian in the...
BACKGROUND Penguins are flightless aquatic birds widely distributed in the Southern Hemisphere. The distinctive morphological and physiological features of penguins allow them to live an aquatic life, and some of them have successfully adapted to the hostile environments in Antarctica. To study the phylogenetic and population history of penguins and the molecular basis of their adaptations to A...
Penguin feathers are highly modified in form and function, but there have been no fossils to inform their evolution. A giant penguin with feathers was recovered from the late Eocene (~36 million years ago) of Peru. The fossil reveals that key feathering features, including undifferentiated primary wing feathers and broad body contour feather shafts, evolved early in the penguin lineage. Analyse...
Second order O( 2 s ) corrections to the heavy quark production cross-section due to massless quarks and coloured scalars are calculated for all energies above threshold. Based on the method introduced in this letter also the gauge non-invariant second order corrections due to the pure gluonic selfenergy insertion and a certain class of O( 3 s ) and O( 4 s ) corrections are determined. For the ...
Using the next-to-leading order low energy effective Hamiltonian for ∆B = 1 transitions, the effects of electroweak penguin operators in some two-body decay modes of B s meson are estimated in the Standard Model (SM). We find that in B s → π+K− and B s → K+K− decay modes, the electroweak penguin effects are small, while in B s → πK̄0, φK̄0, φφ, the electroweak penguin operators enhance or reduce ...
PENGUIN is a grammar-based language for programming graphical user interfaces. Code for each thread of control in a multi-threaded application is confined to its own module, promoting modularity and reuse of code. Networks of PENGUIN components (each composed of an arbitrary number of modules) can be used to construct large reactive systems with parallel execution, internal protection boundarie...
Radiative penguin decays provide an indirect probe for physics beyond the Standard Model and contribute to the determination of the CKM matrix elements. Copious quantities of B mesons produced at the B–Factories permit precision measurements of radiative penguin decays. We review the experimental status of the radiative penguin processes b → s(d)γ.
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