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The two types of Cherenkov gluons at LHC energies
Beside comparatively low energy Cherenkov gluons observed at RHIC, there
could be high energy gluons at LHC, related to the high energy region of
positive real part of the forward scattering amplitude. In both cases they give
rise to particles emitted along some cone. The characteristics of the cones
produced by these two types of gluons are different. Therefore different
experiments are needed to detect them. The cosmic ray event which initiated
this idea is described in detail.Comment: 6 pages, talk at IWCF2006, Hangzhou, Chin
Cherenkov gluons at RHIC and LHC
The coherent hadron production analogous to Cherenkov radiation of photons
gives rise to the ring-like events. Being projected on the ring diameter they
produce the two-bump structure recently observed for the away-side jets at
RHIC. The position of the peaks and their height determine such properties of
the hadronic medium as its nuclear index of refraction, the parton density, the
free path length and the energy loss of Cherenkov gluons. Beside comparatively
low energy gluons observed at RHIC, there could be high energy gluons at LHC,
related to the high energy region of positive real part of the forward
scattering amplitude and possessing different characteristics.Comment: 6 pages, talk at QM2006 modified with new reference
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