18,865 research outputs found
Intrinsic charm content of the nucleon and charmness-nucleon sigma term
In the extended chiral constituent quark model, the intrinsic
content of the nucleon is investigated. The probabilities of the
quark-antiquark components in the nucleon wave functions are calculated by
taking the nucleon to be admixtures of three- and five-quark components, with
the relevant transitions handled {\it via} the P mechanism.
Predictions for the probability of the in the nucleon wave function
and the charmness-nucleon sigma term are presented. Our numerical results turn
out to be consistent with the predictions from various other approaches
reported in the literature.Comment: Accepted for publication in Phys. Rev.
Neutrinos, Weak Interactions, and r-process Nucleosynthesis
Two of the key issues in understanding the neutron-to-proton ratio in a
core-collapse supernova are discussed. One of these is the behavior of the
neutrino-nucleon cross sections as supernova energies. The other issue is the
many-body properties of the neutrino gas near the core when both one- and
two-body interaction terms are included.Comment: To be published in the Proceedings of "International Symposium on
Structure of Exotic Nuclei and Nuclear Forces (SENUF 06)", March 2006, Tokyo,
Japa
Implementation of controlled SWAP gates for quantum fingerprinting and photonic quantum computation
We propose a scheme to implement quantum controlled SWAP gates by directing
single-photon pulses to a two-sided cavity with a single trapped atom. The
resultant gates can be used to realize quantum fingerprinting and universal
photonic quantum computation. The performance of the scheme is characterized
under realistic experimental noise with the requirements well within the reach
of the current technology.Comment: 4 page
Angular Momentum Conservation Law for Randall-Sundrum Models
In Randall-Sundrum models, by the use of general Noether theorem, the
covariant angular momentum conservation law is obtained with the respect to the
local Lorentz transformations. The angular momentum current has also
superpotential and is therefore identically conserved. The space-like
components of the angular momentum for Randall-Sundrum models are
zero. But the component is infinite.Comment: 10 pages, no figures, accepted by Mod. Phys. Lett.
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