Polarized Tops from Stop Decays at the LHC

Details Polarized Tops from Stop Decays at the LHC Polarized Tops from Stop Decays at the LHC

2008-11-06

arxiv.org/abs/0811.1024v2

JHEP 0903:141,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 9 figures, reference and note added

Scientific paper

10.1088/1126-6708/2009/03/141

In supersymmetric models, scalar top quarks, or stops, generically have parity-violating couplings to top quarks. As a result, tops produced in stop decays should be polarized. In this paper, we will argue that this effect may be observable at the LHC with realistic integrated luminosities, provided that one of the stops is copiously produced and can decay to a top and a neutralino. We define the "effective" stop mixing angle, which determines the degree of top polarization, and discuss the prospects for a measurement of this angle at the LHC. If some information about the neutralino mixing matrix is available, this measurement can be used to constrain the mixing angle in the stop sector, one of the most important ingredients in assessing the naturalness of electroweak symmetry breaking in the MSSM.

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