منابع مشابه
Lifetimes of b-flavoured hadrons
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...
متن کاملEstimates of Flavoured Scalar Production in B -decays
Estimates are presented for the branching ratios of several two-particle B-meson decays into flavoured scalar mesons. It seems that there are no estimates of B-meson decays into scalar mesons. The purpose of this short note is to present such estimates. As will be shown, some two-particle decays of B-mesons into scalar mesons have sufficiently large branchings to be of current interest. 1. Havi...
متن کاملFlavoured Soft Leptogenesis
We study the impact of flavour in “soft leptogenesis” (leptogenesis induced by soft supersymmetry breaking terms). We address the question of how flavour effects can affect the region of parameters in which successful soft leptogenesis induced by CP violation in the right-handed sneutrino mixing is possible. We find that for decays which occur in the intermediate to strong washout regimes for a...
متن کاملPesto Flavoured Security
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....
متن کاملFlavoured Dark Matter Beyond MFV
We review a model of quark flavoured dark matter with new flavour violating interactions. This simplified model describes Dirac fermionic dark matter that is charged under a new U(3) flavour symmetry and couples to right-handed down quarks via a scalar mediator. The corresponding coupling matrix is assumed to be the only new source of flavour violation, which we refer to as the Dark Minimal Fla...
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ژورنال
عنوان ژورنال: Nature Reviews Immunology
سال: 2003
ISSN: 1474-1733,1474-1741
DOI: 10.1038/nri1072