5,729 research outputs found
New Signatures of Squarks
When the gluino is light and long lived, missing energy is a poor signature
for both squarks and gluinos. Instead, production in and
collisions characteristically results in events with jets.
Methods are proposed for deciding whether an observed excess of 4-jet events is
due to production. The recent report by ALEPH of observation of 14
4-jet events when 7 were expected is discussed.Comment: 12/22/95 version (put on net 1/1/96) elaborates remarks on squarks as
possible source of ALEPH 4-jet excess and adds a ref. latex, 10 pages
(including 1 figure), uufile
Tidal Disruption Flares as the Source of Ultra-high Energy Cosmic Rays
The optical spectral energy distributions of two tidal disruption flares
identified by van Velzen et al. (2011) in archival SDSS data, are found to be
well-fit by a thin-accretion-disk model. Furthermore, the inferred Supermassive
Black Hole mass values agree well with the SMBH masses estimated from the host
galaxy properties. Integrating the model SEDs to include shorter wavelength
contributions provides an estimate of the bolometric luminosities of the
accretion disks. The resultant bolometric luminosities are well in excess of
the minimum required for accelerating UHECR protons. In combination with the
recent observational estimate of the TDF rate (van Velzen and Farrar, these
Proceedings), the results presented here strengthen the case that transient
jets formed in tidal disruption events may be responsible for accelerating all
or most UHECRs.Comment: 4 pages, 4 figures, invited talk at the ESA Workshop on TIdal
Disruption Events and AGN Outbursts, Madrid, June 25-27, 201
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