Speaker
Prof.
Brent Nelson
(Northeastern University)
Description
Extensions of the MSSM often predict the existence of new fermions
and their scalar superpartners which are vectorlike with respect to the
standard model gauge group but may be chiral under additional gauge factors.
In this paper we explore the production and decay of an important example, i.e.,
a heavy isosinglet charge -1/3 quark and its scalar partner, using the charge
assignments of a 27-plet of E_6 for illustration. We emphasize
that, depending on the symmetries of the low energy theory, such exotic particles
may decay by leptoquark or diquark couplings (which may nevertheless preserve a form
of $R$-parity). Such supersymmetric decay chains will compete with -- and often
obscure -- the signatures of "standard" MSSM superpartners at the LHC. We demonstrate
how to recognize the presence of the exotic superpartners and how well-established
SUSY search algorithms for the LHC will need to be modified.
[Based on a paper with Paul Langacker of Princeton and Junhai Kang of the Univeristy
of Maryland, to appear at the end of May]
Author
Prof.
Brent Nelson
(Northeastern University)
Co-author
Prof.
Paul Lagacker
(Princeton University and Institute of Advanced Study)
