7,940 research outputs found
Monojet and Single Photon Signals from Universal Extra Dimensions
The usual universal extra dimensions scenario does not allow for single
production of first level Kaluza-Klein (KK) excitations of matter due to the KK
number conservation. However, if the matter fields are localized on a fat brane
embedded in a higher dimensional space, matter-gravitation interactions violate
KK number, and the production of single KK excitations becomes possible. In
this paper we analyze the production of a single KK matter excitation together
with a graviton in the final state, and study the potential for discovery at
the Tevatron and Large Hadron Collider.Comment: 15 pages, 5 figure
Ionospheric effects in active retrodirective array and mitigating system design
The operation of an active retrodirective array (ARA) in an ionospheric environment (that is either stationary or slowly-varying) was examined. The restrictions imposed on the pilot signal structure as a result of such operation were analyzed. A 3 tone pilot beam system was defined which first estimates the total electron content along paths of interest and then utilizes this information to aid the phase conjugator so that correct beam pointing can be achieved
- …