Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-01-27
Phys.Rev.D80:035026,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages. Equation (3.43) in v1 corrected, equations renumbered, reference added, other minor corrections
Scientific paper
10.1103/PhysRevD.80.035026
The lighter top squark in supersymmetry can live long enough to form hadronic bound states if it has no kinematically allowed two-body decays that conserve flavor. In this case, scalar stoponium may be observable through its diphoton decay mode at the CERN Large Hadron Collider, enabling a uniquely precise measurement of the top-squark mass. The viability of the signal depends crucially on the branching ratio to diphotons. We compute the next-to-leading order QCD radiative corrections to stoponium annihilation decays to hadrons, photons, and Higgs scalar bosons. We find that the effect of these corrections is to significantly decrease the predicted branching ratio to the important diphoton channel. We also find a greatly improved renormalization-scale dependence of the diphoton branching ratio prediction.
Martin Stephen P.
Younkin James E.
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