Top squarks and bottom squarks in the minimal supersymmetric standard model with complex parameters
Abstract
We present a phenomenological study of top squarks (t1,2) and bottom squarks (b1,2) in the minimal supersymmetric standard model (MSSM) with complex parameters At, Ab, μ, and M1. In particular we focus on the CP phase dependence of the branching ratios of t1,2 and b1,2 decays. We give the formulas of the two-body decay widths and present numerical results. We find that the effect of the phases on the t1,2 and b1,2 decays can be quite significant in a large region of the MSSM parameter space. This could have important implications for t1,2 and b1,2 searches and the MSSM parameter determination in future collider experiments. We have also estimated the accuracy expected in the determination of the parameters of ti and bi by a global fit of the measured masses, decay branching ratios, and production cross sections at e+e- linear colliders with polarized beams. Analyzing two scenarios, we find that the fundamental parameters apart from At and Ab can be determined with errors of 1% to 2%, assuming an integrated luminosity of 1 ab-1 and a sufficiently large center of mass system (c.m.s.) energy to produce also the heavier t2 and b2 states. The parameter At can be determined with an error of 2 3%, whereas the error on Ab is likely to be of the order of 50%.
- Publication:
-
Physical Review D
- Pub Date:
- August 2004
- DOI:
- 10.1103/PhysRevD.70.035003
- arXiv:
- arXiv:hep-ph/0311338
- Bibcode:
- 2004PhRvD..70c5003B
- Keywords:
-
- 14.80.Ly;
- 12.60.Jv;
- Supersymmetric partners of known particles;
- Supersymmetric models;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 31 pages, 8 figures, comments and references added, conclusions unchanged