2008
DOI: 10.1103/physrevd.78.055017
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Higgs boson mass, sparticle spectrum, and the little hierarchy problem in an extended MSSM

Abstract: We investigate the impact of TeV-scale matter belonging to complete vectorlike multiplets of unified groups on the lightest Higgs boson in the MSSM. We find that consistent with perturbative unification and electroweak precision data the mass m h can be as large as 160 GeV. These extended MSSM models can also render the little hierarchy problem less severe, but only for lower values of m h ( 125) GeV. We present estimates for the sparticle mass spectrum in these models.

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Cited by 145 publications
(124 citation statements)
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“…It was shown in ref. [15,16] that introducing vector like particles at the TeV scale with suitable couplings to the MSSM Higgs can provide a significant contribution to the lightest CP-even Higgs mass. We will see that the presence of vector like particles can allow the stop quarks to be as light as the current experimental bound.…”
Section: (2)mentioning
confidence: 99%
“…It was shown in ref. [15,16] that introducing vector like particles at the TeV scale with suitable couplings to the MSSM Higgs can provide a significant contribution to the lightest CP-even Higgs mass. We will see that the presence of vector like particles can allow the stop quarks to be as light as the current experimental bound.…”
Section: (2)mentioning
confidence: 99%
“…The couplings k, k ′ gives rise to 1-loop effects that can significantly raise the lightest Higgs scalar boson mass due to a lack of complete cancellation between scalar and fermion loops, especially for large k if tan β is not small. This was the motivation of [8], but as noted in similar contexts in [10,11] and remarked on further below, it is doubtful whether this really ameliorates the supersymmetric little hierarchy problem.…”
Section: Mssm Extended By Vector-like Fields Coupled To a New Conmentioning
confidence: 99%
“…Similar effects have been noted before in the case of vector-like fermions without an additional gauge group in refs. [10], [11], [13]. Qualitatively, the model with SU(2) X and no new Yukawa coupling seems to be the least fine-tuned of the extended models.…”
Section: The µ Parameter and The Little Hierarchy Problemmentioning
confidence: 99%
“…The latter are heavy spin 1/2 particles that transform as triplets under colour and whose left-and right-handed couplings have the same Quantum Chromo-Dynamics (QCD) and Electro-Weak (EW) quantum numbers. These states are predicted by various theoretical models (composite Higgs models [5][6][7][8][9][10][11][12], models with extra dimensions, little Higgs models [13,14], models with gauging of the flavour group [15][16][17][18], non-minimal supersymmetric extensions of the Standard Model (SM) [19][20][21][22][23][24], Grand Unified Theories [25,26]) and can be observed in a large number of final states, depending on how they interact with SM particles (see for example [27-29, 32, 33] for general reviews). Usually experimental searches for vector-like quarks adopt a phenomenological approach, assuming that only one new Q V state is present beyond the SM and, in order to be as model independent as possible, searches usually consider QCD pair production, although very recently single production has also been explored [35].…”
Section: Introductionmentioning
confidence: 99%