Higgs Properties in the Fourth Generation MSSM: Boosted Signals Over the 3G Plan

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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 familiar Higgs sector. In most of the 3GMSSM parameter space, the lighter CP-even h is {approx} 115-125 GeV and mostly Standard Model-like while H,A,H{sup {+-}} are all relatively heavy. Furthermore, the ratio of Higgs vevs, tan {beta}, is relatively unconstrained. In contrast to this, in the 4GMSSM, heavy fourth generation fermion loops drive the masses of h,H,H{sup {+-}} to large values while the CP-odd boson, A, can remain relatively light and tan {beta} is restricted ... continued below

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19 pages

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Cotta, R.C.; Hewett, J.L.; Ismail, A.; Le, M.-P.; Rizzo, T.G. & /SLAC August 15, 2011.

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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 familiar Higgs sector. In most of the 3GMSSM parameter space, the lighter CP-even h is {approx} 115-125 GeV and mostly Standard Model-like while H,A,H{sup {+-}} are all relatively heavy. Furthermore, the ratio of Higgs vevs, tan {beta}, is relatively unconstrained. In contrast to this, in the 4GMSSM, heavy fourth generation fermion loops drive the masses of h,H,H{sup {+-}} to large values while the CP-odd boson, A, can remain relatively light and tan {beta} is restricted to the range 1/2 {approx}< tan {beta} {approx}< 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 {yields} A may lead to a potential signal in the {tau}{sup +}{tau}{sup -} channel at the LHC, A may first be observed in the {gamma}{gamma} 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 {approx} 115-120 and tan {beta} < 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.

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19 pages

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  • Journal Name: Submitted to Physical Review D; Journal Volume: 84; Journal Issue: 7

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  • Report No.: SLAC-PUB-14454
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevD.84.075019 | External Link
  • Office of Scientific & Technical Information Report Number: 1022545
  • Archival Resource Key: ark:/67531/metadc833279

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 15, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 8:10 p.m.

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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/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.