42 research outputs found
CP Violating Asymmetry in Stop Decay into Bottom and Chargino
In the MSSM with complex parameters, loop corrections to the decay of a stop
into a bottom quark and a chargino can lead to a CP violating decay rate
asymmetry.
We calculate this asymmetry at full one-loop level and perform a detailed
numerical study, analyzing the dependence on the parameters and complex phases
involved. In addition, we take the Yukawa couplings of the top and bottom quark
running. We account for the constraints on the parameters coming from several
experimental limits.
Asymmetries of several percent are obtained. We also comment on the
feasibility of measuring this asymmetry at the LHC.Comment: Contributed talk given by Sebastian Frank in June 2009 at SUSY09 -
17th International Conference on Supersymmetry and the Unification of
Fundamental Interactions, Northeastern University, Boston, USA. To appear in
the AIP conference proceedings, 4 pages, 7 figures (fixed links in
references
CP violation in charged Higgs boson decays into tau and neutrino
We calculate the CP-violating rate asymmetry of H^\pm decays into tau and
neutrino at one loop in the MSSM with complex parameters. We find that the
asymmetry is typically of the order of 10^-3, depending mainly on the phases of
the trilinear coupling A_\tau and of the gaugino mass M_1.Comment: 9 pages, 3 figures, uses JHEP3.cl
CP violation in charged Higgs decays in the MSSM
In the MSSM with complex parameters loop corrections to the decays and with and lead to
CP-violating asymmetries: a decay rate asymmetry, a forward-backward asymmetry
and an energy asymmetry. We derive explicit formulas for them and perform a
detailed numerical analysis. We study the dependence on the parameters and the
phases involved. In particular, the influence of the running Yukawa coupling is
taken into account. The decay rate asymmetry can go up to 25%, the
forward-backward and the energy asymmetry up to 10%.Comment: 18 pages, 13 postscript figures, JHEP style, Feynman graphs replaced,
one reference adde
CP-violating asymmetries in top-quark production and decay in annihilation within the MSSM
We obtain analytic formulae for the cross section of the sequential processes
of and in the laboratory frame where the
dependence on triple product correlations of the type (\hat(q}_1 x \hat{q}_2 .
\hat{q}_3), induced by CP violation both in the production and the decay are
explicitely shown. Different observables sensitive to CP violation are defined
and calculated in the Minimal Supersymmetric Standard Model (MSSM). The
observables sensitive to CP violation are of the order of . The
dependence on the masses of the supersymmetric particles is also shown.Comment: 17 pages of LateX plus five uuencoded Postscript figures, LateX file
and PS-figures are also available via anonymous ftp at
ftp://info.oeaw.ac.at/pub/hephy-pub/62
CP violating asymmetries in single top quark production at the Tevatron p pbar collider
Analytic expressions for the angular distributions of the -quarks
associated with single -quark production in and of the leptons from the subsequent decay are
obtained in the laboratory system. CP violation in the -production vertex is
assumed. Different angular and total cross section CP violating asymmetries are
considered. Relations testing CP violation solely in the -decay vertex are
also obtained. A numerical analysis is performed in the MSSM with a CP
violating phase of the trilinear coupling . The asymmetries are
typically of the order - .Comment: The numerical results are corrected and some changes that meet the
requirements of Phys. Rev. D are mad
Searches for new physics
Review of prospects for discovery of new physics signals at LEP2. The areas covered include SUSY, exotic fermions, BESS models, leptoquarks, virtual effects and CP violating observables