منابع مشابه
A Study of Heavy Flavoured Meson Fragmentation Functions in e+e− annihilation
We compare QCD theoretical predictions for heavy flavoured mesons fragmentation spectra in e+e− annihilation with data from CLEO, BELLE and LEP. We include several effects in our calculation: nextto-leading order initial conditions, evolution and coefficient functions. Soft-gluon effects are resummed at next-to-leading-log accuracy. A matching condition for the crossing of the bottom threshold ...
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We demonstrate that symmetric-key cryptography can be used for both read and write access control. One-time write access can be granted by handing over an encryption key, and our encryption framework allows the revocation of previously granted rights. The number of keys to be managed explicitly grows linearly with the number of access control policies a user defines, making security manageable....
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I discuss the heavy quark expansion for the inclusive widths of heavy-light hadrons, which predicts quite well the experimental ratios of Bq meson lifetimes. As for Λb, current determinations of O(m−3 b ) contribution to τ(Λb) do not allow to explain the small measured value of τ(Λb)/τ(Bd). As a final topic, I discuss the implications of the measurement of the Bc lifetime. 1. Lifetimes of heavy...
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ژورنال
عنوان ژورنال: Pramana
سال: 2012
ISSN: 0304-4289,0973-7111
DOI: 10.1007/s12043-012-0388-0