Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-06-30
Eur.Phys.J. C33 (2004) 433-442
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 5 figures, 2 tables; comments and references added; two tables added; version to appear in Eur. Phys. J
Scientific paper
10.1140/epjc/s2003-01521-9
We define a CP sensitive asymmetry in the sfermion decays $\ti f \to f \ti\chi^0_j \ell \bar \ell, f \ti\chi^0_j q \bar q$, based on triple product correlations between the momenta of the outgoing fermions. We study this asymmetry in the MSSM with complex parameters. We show that the asymmetry is sensitive to the phases of the parameters $\mu$ and $M_1$. The leading contribution stems from the decay chain $\ti f\to f \ti\chi^0_j\to f \ti\chi^0_1 Z\to f \ti\chi^0_1 \ell \bar \ell (f \ti\chi^0_1 q \bar q)$, for which we obtain analytic formulae for the amplitude squared. The asymmetry can go up to 3% for $\ti f\to f \ti\chi^0_1 \ell \bar \ell$, and up to 20% for $\ti f\to f \ti\chi^0_1 q \bar q$. We also estimate the rates necessary to measure the asymmetry.
Bartl Alfred
Fraas Hans
Kernreiter Thomas
Kittel Olaf
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