Study of b-quarks in the minimal supersymmetric standard model at large tan beta.

摘要

The Minimal Supersymmetric Standard Model (MSSM) at large tan beta naturally leads to enhanced coupling of some Higgs bosons to b quarks, as well as the possibility of a very light sbottom, b˜ . We investigate the 5sigma discovery prospects at the CERN Large Hadron Collider of a neutral Higgs boson produced with a single energetic b quark followed by Higgs decay into mu+mu - or tau+tau- lepton pairs. Promising results are found for Higgs masses up to 600 GeV and 1 TeV for muon and tau decays respectively. This process greatly improves the discovery potential of the LHC beyond the inclusive channel pp → &phis; 0 → mu+mu-/tau+tau - + X. We also study constraints on the light b˜ (2--5 GeV) and light gluino (12--16 GeV) window from data collected at the CERN LEP collider. It is shown that existing data for 3-jet events as well as that for Z → bb bb decays could contain hidden signatures of sbottoms.