Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-17
Phys.Rev.D71:073003,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 9 eps figures
Scientific paper
10.1103/PhysRevD.71.073003
We consider the top-antitop invariant mass distributions for production of unpolarized and polarized top quark pairs at LHC, in the theoretical framework of the MSSM. Assuming a "moderately" light SUSY scenario, we derive the leading logarithmic electroweak contributions at one loop in a region of large invariant mass, $M_{t\bar t}\simeq1$ TeV, for the unpolarized differential cross section $d\sigma/dM_{t\bar t}$ and for the differential longitudinal top polarization asymmetry $A_t(M_{t\bar t})$. We perform a realistic evaluation of the expected uncertainties of the two quantities, both from a theoretical and from an experimental point of view, and discuss the possibility of obtaining, from accurate measurements of the two mass distributions, stringent consistency tests of the model, in particular identifications of large $\tan\beta$ effects.
Beccaria Matteo
Bentvelsen Stan
Cobal Marina
Renard Fernand M.
Verzegnassi Claudio
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