5,133 research outputs found
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
Detecting Gluino-Containing Hadrons
When SUSY breaking produces only dimension-2 operators, gluino and photino
masses are of order 1 GeV or less. The gluon-gluino bound state has mass
1.3-2.2 GeV and lifetime > 10^{-5} - 10^{-10} s. This range of mass and
lifetime is largely unconstrained because missing energy and beam dump
techniques are ineffective. With only small modifications, upcoming K^0 decay
experiments can study most of the interesting range. The lightest
gluino-containing baryon (uds-gluino) is long-lived or stable; experiments to
find it and the uud-gluino are also discussed.Comment: 13 pp, 1 figure (uuencoded). Descendant of hep-ph/9504295,
hep-ph/9508291, and hep-ph/9508292, focused on experimental search
techniques. To be published in Phys Rev Let
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