[Jlab-seminars] Theory Center Seminar

[Mary Fox]

*In addition to the seminar, "Women in Physics in the US: Numbers, 
Challenge, and Solutions," on Thurs., April 5, Dr. Simmons will give the 
following physics talk on Wed., April 4:/
/*

Theory Center Seminar
Wed., April 4, 2012
CEBAF Center, Room L104
3:00 p.m. (coffee at 2:45 p.m.)


Elizabeth H. Simmons              
Dean, Lyman Briggs College and Professor of Physics
Michigan State University

*Strong Top Quark Dynamics in the LHC Era*
*
*
Ongoing LHC searches for the standard model Higgs Boson in WW or ZZ 
decay modes strongly constrain the top-Higgs state predicted in many 
models with new dynamics that preferentially affects top quarks. Such a 
state couples strongly to top-quarks, and is therefore produced through 
gluon fusion at a rate that can be greatly enhanced relative to the rate 
for the standard model Higgs boson. As we discuss in this talk, a 
top-Higgs state with mass less than 300 GeV is excluded at 95% CL if the 
associated top-pion has a mass of 150 GeV, and the constraint is even 
stronger if the mass of the top-pion state exceeds the top-quark mass or 
if the top-pion decay constant is a substantial fraction of the weak 
scale. Bounds from searches for a Higgs boson decaying to photon pairs 
or from the rare process b -> s photon are also very informative.  When 
combined, these results have significant implications for theories with 
strong top dynamics, such as topcolor-assisted technicolor, top-seesaw 
models, and certain Higgsless models.

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