340 research outputs found
Phenomenology of Charginos and Neutralinos in the Light Gaugino Scenario
The light gaugino scenario predicts that the lighter chargino mass is less
than m_W, gluino and lightest neutralino masses are <~ 1 GeV, and the dominant
decay mode of charginos and non-LSP neutralinos is generically to three jets.
The excess "4j" events observed by ALEPH in e+ e- annihilation at 133 GeV may
be evidence that m(C_1) = 53 GeV. If so, m(N_2) = 110-121 GeV, m(N_2) = 38-63
GeV, m(N_3) = 75-68 GeV; m(sneu_e) is probably ~m(C_1). A detailed analysis of
the multi-jet events is needed to exclude this possibility. Consequences for
FNAL and higher energy LEP running are given.Comment: 12 pages, 1 fig
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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