Searches for beyond Sm Higgs Boson at the Tevatron

The Higgs mechanism is the heart of the Standard Model (SM) providing masses to gauge bosons via electroweak symmetry breaking (EWSB). However, the SM fails to explain the origin of the Higgs mechanism and has certain naturalness problems, such as the extreme fine tuning required to keep the higher order corrections to the higgs mass under control (the so called hierarchy problem). In popular SM extensions, such as minimal SUSY (MSSM)1 and Little(st) Higgs 2 models, the EWSB is radiatively generated and these models are free from many of the above difficulties. In these models, the higgs sector is typically more complex, requiring additional neutral and charged higgs bosons in MSSM, and even doubly charged higgs bosons in Little Higgs, SUSY with extended higgs sector, and Left-Right symmetric 3 models. While the production cross section of higgs bosons is usually model dependent, the phenomenology in terms of decay modes and production mechanisms are often similar for a wide variety of new phenomena scenarios. This simplifies the interpretation of the experimental results: while the cross section driven mass limits are usually model dependent, production cross section limits obtained for certain benchmark scenarios are often applicable to other models.