Light Gluino and the Running of alphas
Cheng-Wei Chiang, Zumin Luo, Jonathan L. Rosner
Abstract
A gluino in the mass range 12--16 GeV combined with a light (2--5.5 GeV) bottom squark, as has been proposed recently to explain an excess of b quark hadroproduction, would affect the momentum-scale dependence (``running'') of the strong coupling constant alphas in such a way as to raise its value at MZ by about 0.014 +/- 0.001. If one combines sources of uncertainty at low (mb) and high (MZ) mass scales, one can only distinguish such an effect at slightly more than the 2 sigma level. Prospects for improvement in this situation, which include better lattice QCD simulations and better measurements at MZ, are discussed.
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