Theory Seminar

KEK 素粒子原子核研究所・理論セミナー



TITLE SUPERSYMMETRY, LHC AND DARK MATTER
(英語 / in English)
SPEAKER Dr. Xerxes Tata
University of Hawaii
DATE: December 19 (Mon.) 14:00 − 15:00
PLACE: Kenkyu-Honkan 1F, Meeting Room 1



    ABSTRACT

The hypothesis of weak scale supersymmetry ameliorates the gauge hierarchy problem, yields gauge couplings consistent with grand unification, and when augmented by R-parity conservation, provides natural candidates for the observed dark matter (DM). We review strategies for SUSY searches at the LHC, and project its reach in terms of sparticle masses in a relatively model-indendent manner. Assuming that the neutralino is a stable thermal relic from standard Big Bang cosmology, the measured density of cold DM selects out special regions in the parameter space of any underlying SUSY model with concomitant implications for collider physics, dark matter searches and low energy measurements. We examine the thermal neutralino relic density within the mSUGRA model as well as in various one-parameter extensions of mSUGRA (where we relax the underlying untested universality assumption) constructed to yield the measured relic density, and show that these implications, are in general, model-dependent. We nevertheless point out some relatively robust implications of the relic density determination for the LHC. Changing tracks, we describe a new bottom-up strategy for extracting neutralino mass parameters at the LHC and discuss its limitations. We conclude with an outlook for the future.