Single top production associated with a neutral scalar at LHC in topcolor-assisted technicolor

  • The topcolor-assisted technicolor (TC2) model predicts a number of neutral scalars like the top-pion (π0t) and the top-Higgs (h0t). These scalars have flavor-changing neutral-current (FCNC) top quark couplings, among which the top-charm transition couplings may be sizable. Such FCNC couplings induce single top productions associated with a neutral scalar at the CERN Large Hadron Collider (LHC) through the parton processes cg→t π0t and cg→t h0t. In this paper we examine these productions and find their production rates can exceed the 3σ sensitivity of the LHC in a large part of parameter space. Since in the Standard Model and the minimal supersymmetric model such rare productions have unobservably small production rates at the LHC, these rare processes will serve as a good probe for the TC2 model.

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LIU Guo-Li and ZHANG Huan-Jun. Single top production associated with a neutral scalar at LHC in topcolor-assisted technicolor[J]. Chinese Physics C, 2008, 32(9): 697-699. doi: 10.1088/1674-1137/32/9/004
LIU Guo-Li and ZHANG Huan-Jun. Single top production associated with a neutral scalar at LHC in topcolor-assisted technicolor[J]. Chinese Physics C, 2008, 32(9): 697-699.  doi: 10.1088/1674-1137/32/9/004 shu
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Received: 2007-11-08
Revised: 2007-11-23
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Single top production associated with a neutral scalar at LHC in topcolor-assisted technicolor

    Corresponding author: ZHANG Huan-Jun,

Abstract: 

The topcolor-assisted technicolor (TC2) model predicts a number of neutral scalars like the top-pion (π0t) and the top-Higgs (h0t). These scalars have flavor-changing neutral-current (FCNC) top quark couplings, among which the top-charm transition couplings may be sizable. Such FCNC couplings induce single top productions associated with a neutral scalar at the CERN Large Hadron Collider (LHC) through the parton processes cg→t π0t and cg→t h0t. In this paper we examine these productions and find their production rates can exceed the 3σ sensitivity of the LHC in a large part of parameter space. Since in the Standard Model and the minimal supersymmetric model such rare productions have unobservably small production rates at the LHC, these rare processes will serve as a good probe for the TC2 model.

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