Speaker
Mansoora Shamim
(Kansas State University)
Description
Searches in the framework of R-parity conserving supergravity inspired models
have been performed in data collected by the D\O\ detector at Tevatron $p\bar
{p}$ collider at a center-of-mass energy of $\sqrt{s} = 1.96$~TeV. Topologies
analyzed consist of acoplanar-jets and multijets events with large missing
transverse energy in the final state.
In the first search, generic squarks and gluinos productions were investigated
in 1~fb$^{-1}$ of data. The data show good agreement with the standard
model expectations and improved mass limits have been derived. Lower limits
of 375~GeV and 289~GeV were derived at 95\% C.L on the squarks and gluino
masses, respectively, with $\tan \beta = 3$, $A_0 = 0$ and $\mu < 0$.
Previous limits obtained by D\O\ collaboration are improved by about 50~GeV.
Supergravity inspired models suggest the existence of light supersymmetric
partners of the third generation quarks: a light stop for moderate values of
$\tan\beta$, a light sbottom for large $\tan\beta$. If the stop or sbottom is the
next-to-lightest supersymmetric particle, the expected decay channels are
$\tilde{t}\to c \tilde{\chi}^0_1$ and $\tilde{b}\to b\tilde{\chi}^0_1$,
respectively, with $\tilde{\chi}^0_1$ assumed to be the lightest
supersymmetric particle. Pair production of stops or sbottoms will therefore
lead to the signature of two acoplanar heavy flavor jets and missing transverse
energy. The searches for such final states are performed, improving significantly
upon the results from Run I of the Tevatron.
Author
Mansoora Shamim
(Kansas State University)
Co-author
D0 Collaboration
