Production Of The Top-pions From The Higgsless-top-Higgs Model At The LHC

Content: The Standard Model(SM) of elementary particle has achieved much success. How- ever, the scalar sector suffers from the problems of too many free prameters, triviality and unnaturalness, etc. Therefore SM can only be an effective field theory below some high energy scale. There may be new physics beyond the SM. To completely avoid the problems arising from the elementary higgs field in the standard model(SM), various models for dynamical electroweak symmetry breaking(EWSB) have been proposed, among which the topcolor scenario is attrac- tive because it can explain the large top mass and provide a possible EWSB mechanism. The common feature of this kind of models is that topcolor interactions make small contributions to EWSB and give rise to most part of the top mass, while EWSB is mainly induced by technicolor or other strong interactions.Recently, the model building along with the TeV-scale extra dimensional scenario has been widely studied. For extra dimensional descriptions of the topcolor scenario, there are two sepa- rate 5 dimensional anti de Sitter spaces(AdS₅^′s) with each sector having its own corresponding infrared(IR) brahe. The light fermions propagate in an AdSs sector, while the third generation quarks would propagate in other AdS₅ sector, and sources for EWSB are localized on both of these IR branes. Using the appropriate boundary and matching conditions, there are three possibilities for EWSB: Higgs-top-Higgs, Higgsless-top-Higgs, and Higgsless-Higgsless. For the Higgsless-top-Higgs case, most of EWSB comes from the higgsless sector, and the top quark gets its mass from a top-Higgs on the other IR brahe.In the context of the Higgsless-top-Higgs model, we discuss the production of these new particles at the CERN Large Hadron Collider(LHC) via various suitable mechanisms and esti- mate their production rates. First, the neutral top-pionÏ€_t^o can be abundantly produced via the gluon-gluon fusion and bottom-bottom fusion processes. Second, the main decay modes of the heavy neutral top-pionÏ€_t^o are t(?) and gg, thus the neutral top-pionÏ€_t^o can generate significant corrections to the t(?) production at the LHC via the process pp→π_t^o +X→t(?)+X. At last, for a heavy charged scalar, the dominant production process at the LHC is its associated production with a top quark via gluon bottom fusion. The LHC has good potential for discovering a heavy charged scalar through this process. We find that, as long as the top-pions are not too heavy,they can be abundantly produced at the LHC. The possible signatures of these new particles might be detected at the LHC experiments.