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Hunting long-lived gluinos at the Pierre Auger Observatory

AutorAnchordoqui, Luis A.; Delgado, Antonio; García Canal, Carlos A.; Sciutto, Sergio J.
Palabras claveGluinos
Particle Collision
Particle Physics
High Energy Physics
Fecha de publicación2-oct-2007
ResumenEventual signals of split sypersymmetry in cosmic ray physics are analyzed in detail. The study focusses particularly on quasi-stable colorless R-hadrons originating through confinement of long-lived gluinos (with quarks, anti-quarks, and gluons) produced in pp collisions at astrophysical sources. Because of parton density requirements, the gluino has a momentum which is considerable smaller than the energy of the primary proton, and so production of heavy (mass ~ 500 GeV) R-hadrons requires powerful cosmic ray engines able to accelerate particles up to extreme energies, somewhat above 10^{13.6} GeV. Using a realistic Monte Carlo simulation with the AIRES engine, we study the main characteristics of the air showers triggered when one of these exotic hadrons impinges on a stationary nucleon of the Earth atmosphere. We show that R-hadron air showers present clear differences with respect to those initiated by standard particles. We use this shower characteristics to construct observables which may be used to distinguish long-lived gluinos at the Pierre Auger Observatory.
DescripciónA ps version of the paper with high resolution figures is available at: http://www.hep.physics.neu.edu/staff/doqui/rhadron_highres.ps
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