1,360 research outputs found
SUSY--QCD corrections to scalar quark decays into charginos and neutralinos
We calculate the supersymmetric QCD corrections in order to the
decays \squark_i \to q' \chargino_j (i,j = 1,2) and \squark_i \to q
\neutralino_k (k = 1,...4) within the Minimal Supersymmetric Standard Model.
In particular we consider the decays of squarks of the third generation,
\stop_i and \sbottom_i (i = 1,2), where the left--right mixing must be
taken into account. The corrections turn out to be of about 10\%, except for
higgsino--like charginos or neutralinos, where they can go up to 40\%.Comment: 15 pages (including 5 figures). Tiny corrections in the text are
made. An acknowledgement is added. Figures 2 - 5 are replaced by new ones
(change in one curve in each figure). To be published in Phys. Lett.
CP sensitive observables in chargino production and decay into a W boson
We study CP sensitive observables in chargino production in electron-positron
collisions with subsequent two-body decay of one chargino into a W boson. We
identify the CP odd elements of the W boson density matrix and propose CP
sensitive triple-product asymmetries of the chargino decay products. We
calculate the density-matrix elements, the CP asymmetries and the cross
sections in the Minimal Supersymmetric Standard Model with complex parameters
\mu and M_1 for an e+ e- linear collider with \sqrt{s} = 800 GeV and
longitudinally polarized beams. The asymmetries can reach 7% and we discuss the
feasibility of measuring these asymmetries.Comment: 23 pages, 7 figure
CP violation in chargino production and decay into sneutrino
We study CP odd asymmetries in chargino production E+ E- --> ~Chi(+-)(1)
\~Chi(-+)(2) and the subsequent two-body decay of one chargino into a
sneutrino. We show that in the Minimal Supersymmetric Standard Model with
complex parameter \mu the asymmetries can reach 30 %. We discuss the
feasibility of measuring these asymmetries at a linear collider with \sqrt{s} =
800 GeV and longitudinally polarized beams.Comment: 10 pages, 3 figure
Impact of CP phases on stop and sbottom searches
We study the decays of top squarks (stop_{1,2}) and bottom squarks
(sbottom_{1,2}) in the Minimal Supersymmetric Standard Model (MSSM) with
complex parameters A_t, A_b, mu and M_1. We show that including the
corresponding phases substantially affects the branching ratios of stop_{1,2}
and sbottom_{1,2} decays in a large domain of the MSSM parameter space. We find
that the branching ratios can easily change by a factor of 2 and more when
varying the phases. This could have an important impact on the search for
stop_{1,2} and sbottom_{1,2} and the determination of the MSSM parameters at
future colliders.Comment: 17 pages, 5 figures, LaTeX2
Impact of bosonic decays on the search for stau_2 and tau-sneutrino
We perform a detailed study of the decays of the heavier tau slepton (stau_2)
and tau-sneutrino (snu_tau) in the Minimal Supersymmetric Standard Model
(MSSM). We show that the decays into Higgs or gauge bosons, i.e. stau_2 ->
stau_1 + (h^0, H^0, A^0 or Z^0), stau_2 -> snu_tau + (H^- or W^-), and snu_tau
-> stau_1 + (H^+ or W^+), can be very important due to the sizable tau Yukawa
coupling and large mixing parameters of stau. Compared to the decays into
fermions, such as stau_2 -> tau + neutralino_i and stau_2 -> nu_tau +
chargino_j^-, these bosonic decay modes can have significantly different decay
distributions. This could have an important influence on the search for stau_2
and snu_tau and the determination of the MSSM parameters at future colliders.Comment: 12 pages, 3 figures, LaTeX2
Production of Stop, Sbottom, and Stau at LEP2
We present a comprehensive study of pair production and decay of stops,
sbottoms, and staus in annihilation at LEP2. We give numerical
predictions within the Minimal Supersymmetric Standard Model for cross sections
and decay rates, and discuss the important signatures. In the case of stau
production we also study the polarization of the tau in the decays stau_1 ->
tau + neutralino_{1,2}.Comment: 15 pages, LateX, 13 figures appended as uuencoded PS-file. LateX file
and figures are also available via anonymous ftp at
ftp://info.oeaw.ac.at/pub/hephy-pub/64
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