Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-18
Phys.Rev. D67 (2003) 035008
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 2 figures; text modified and references added for journal publication
Scientific paper
10.1103/PhysRevD.67.035008
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 alpha_s in such a way as to raise its value at M_Z by about 0.014 +/- 0.001. If one combines sources of uncertainty at low (m_b) and high (M_Z) 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 M_Z, are discussed.
Chiang Cheng-Wei
Luo Zumin
Rosner Jonathan L.
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