Bounds on the Gluino Mass from a Global Parton Density Analysis
Abstract
Parton distribution functions for protons are devised in which a light gluino is included along with standard model quark, antiquark, and gluon constituents. A global analysis of a large set of hadronic scattering data provides empirical constraints on the allowed range of the gluino mass as a function of the value of the strong coupling strength alphas(MZ). We find that the gluino mass mg > 12 GeV for the standard model world-average value alphas(MZ)=0.118. Gluino masses as small as 10 GeV are admissible provided that alphas(MZ) > 0.12, about one standard deviation above the world-average value. Current hadron scattering data are insensitive to the presence of gluinos heavier than about 100 - 150 GeV.
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