Higgs Properties in the Fourth Generation MSSM: Boosted Signals Over the 3G Plan Page: 1 of 20
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Higgs Properties in the Fourth Generation MSSM:
Boosted Signals Over the 3G Plan *
R.C. Cotta, J.L. Hewett, A. Ismail, M.-P. Le and T.G. Rizzot
SLAC National Accelerator Laboratory,
2575 Sand Hill Rd, Menlo Park, CA 94025, USA
The generalization of the MSSM to the case of four chiral fermion generations
(4GMSSM) can lead to significant changes in the phenomenology of the otherwise fa-
miliar Higgs sector. In most of the 3GMSSM parameter space, the lighter CP-even h
is - 115 - 125 GeV and mostly Standard Model-like while H, A, HW are all relatively
heavy. Furthermore, the ratio of Higgs vevs, tan 0, is relatively unconstrained. In con-
trast to this, in the 4GMSSM, heavy fourth generation fermion loops drive the masses
of h, H, HW to large values while the CP-odd boson, A, can remain relatively light and
tan 0 is restricted to the range 1/2 < tan 7 < 2 due to perturbativity requirements
on Yukawa couplings. We explore this scenario in some detail, concentrating on the
collider signatures of the light CP-odd Higgs at both the Tevatron and LHC. We find
that while gg - A may lead to a potential signal in the T+T- channel at the LHC, A
may first be observed in the yy channel due to a highly loop-enhanced cross section
that can be more than an order of magnitude greater than that of a SM Higgs for A
masses of - 115 - 120 and tan 0 < 1. We find that the CP-even states h, H are highly
mixed and can have atypical branching fractions. Precision electroweak constraints,
particularly for the light A parameter space region, are examined in detail.
*Work supported by the Department of Energy, Contract DE-AC02-76SF00515
te-mail: randoo, hewett, aismail, myphuong, firstname.lastname@example.org
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Cotta, R.C.; Hewett, J.L.; Ismail, A.; Le, M.-P.; Rizzo, T.G. & /SLAC. Higgs Properties in the Fourth Generation MSSM: Boosted Signals Over the 3G Plan, article, August 15, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc833279/m1/1/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.