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LHC Accessible Second Higgs Boson in the Left-Right Model · Around

2013

LHC Accessible Second Higgs Boson in the Left-Right Model

Mohapatra, Rabindra N., Zhang, Yongchao

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A second Higgs doublet arises naturally as a parity partner of the standard model (SM) Higgs, once SM is extended to its left-right symmetric version (LRSM) to understand the origin of parity violation in weak interactions as well as to accommodate small neutrino masses via the seesaw mechanism.

The flavor changing neutral Higgs (FCNH) effects in the minimal version of this model (LRSM), however, push the second Higgs mass to more than 15 TeV making it inaccessible at the LHC.
Furthermore since the second Higgs mass is directly linked to the $W_R$ mass, discovery of a "low" mass $W_R$ ($M_{W_R}\leq 5-6$ TeV) at the LHC would require values for some Higgs self couplings larger than one.
In this paper we present an extension of LRSM by adding a vector-like $SU(2)_R$ quark doublet which weakens the FCNH constraints allowing the second Higgs mass to be near or below TeV and a third neutral Higgs below 3 TeV for a $W_R$ mass below 5 TeV.

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For some recent discussions of second Higgs boson in colliders, see E. Brownson, N. Craig, U. Heintz, G. Kukartsev, M. Narain, N. Parashar and J. Stupak, arXiv:1308.6334 [hep-ex]; N. Craig, J. Galloway and S. Thomas, arXiv:1305.2424 [hep-ph]; C. -Y. Chen, S. Dawson and M. Sher, Phys. Rev. D 88
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