Theory and phenomenology of the η c photo-and electroproduction is developed from the point of view of probing the odderon singularity in QCD which corresponds to the three gluon exchange mechanism. This mechanism leads to the cross-sections which are independent of W 2 for the exchange of three noninteracting gluons or exhibit increase with increasing W 2 (or 1/x) for the odderon intercept above unity. The η c electroproduction in the three gluon exchange mechanism is shown to be entirely controlled by the transversely polarised virtual photons. The magnitude of the η c photoproduction cross-section is estimated to be around 11-45 pb. The t-dependence of the differential cross-section is also discussed.
We study weak interaction rates involving Goldstone bosons in Color FlavorLocked (CFL) quark matter. Neutrino mean free path and the rate of energy loss due to neutrino emission in a thermal plasma of CFL pions and kaons is calculated. We find that in addition to neutrino scattering off thermal mesons, novel Cherenkov like processes wherein mesons are either emitted or absorbed contribute to the neutrino opacity. Lack of Lorentz invariance in the medium and loss of rotational invariance for processes involving mesons moving relative to the medium allow for novel processes such as π 0 → νν and e − π + → ν e . We explore and comment on various astrophysical implications of our finding.
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We analyze the phase diagram in effective chiral quark models (the
Nambu-Jona-Lasinio model, the sigma-model with quarks) and show that at the
mean-field level a phase with a periodically-modulated chiral fields separates
the usual phases with broken and restored chiral symmetry. A possible signal of
such a phase is the production of multipion jets travelling in opposite
directions, with individual pions having momenta of the order of several
hundred MeV. This signal can be interpreted in terms of disoriented chiral
condensates
The Isgur-Wise functions for the ground state to ground state semileptonic decays involving b → c transitions are calculated from the (modified) MIT bag model. It is checked that the results for the decays B → Dlν and B → D * lν agree well with experiment. Predictions for the decays Λ b → Λ c lν, B s → D s lν and B s → D * s lν are given and discussed.
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