Higgs boson mass, sparticle spectrum, and the little hierarchy problem in an extended MSSM

Babu, K. S.; Gogoladze, Ilia; Rehman, Mansoor Ur; Shafi, Qaisar

doi:10.1103/physrevd.78.055017

Cited by 144 publications

(124 citation statements)

References 41 publications

(28 reference 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%

Higgs boson production and decay: Effects from light third generation and vectorlike matter

2012

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We study the implications of light third generation sparticles on the production cross section and decay widths of a light CP-even Higgs boson. For simplicity, we consider scenarios in which only one of the sfermions from the third generation is light. For each case, we attempt to explain the apparently large enhancement in the Higgs production and decay in the diphoton channel with small deviations in the ZZ channel. In the MSSM framework we find that only a light stau can explain these observations while keeping the lightest CP-even Higgs boson mass in the interval 123 GeV m h 127 GeV. For the light stop scenario, the observations related to the diphoton and ZZ channel can be accommodated but, in order to satisfy the Higgs mass bound, one needs to go beyond the MSSM. In particular, we invoke vector like particles with masses around a TeV. These new particles preserve gauge coupling unification and provide additional contributions to the Higgs mass. With these new contributions a 126 GeV Higgs mass is easily achieved. We also find that with only a light sbottom quark, the above mentioned excess is hard to accommodate.

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Section: (2)mentioning

confidence: 99%

Higgs boson production and decay: Effects from light third generation and vectorlike matter

2012

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“…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%

Quirks in supersymmetry with gauge coupling unification

Martin

2011

Phys. Rev. D

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I investigate the phenomenology of supersymmetric models with extra vectorlike supermultiplets that couple to the Standard Model gauge fields and transform as the fundamental representation of a new confining non-Abelian gauge interaction. If perturbative gauge coupling unification is to be maintained, the new group can be SU(2), SU(3), or SO(3). The impact on the sparticle mass spectrum is explored, with particular attention to the gaugino mass dominated limit in which the supersymmetric flavor problem is naturally solved. The new confinement length scale is astronomical for SO(3), so the new particles are essentially free. For the SU(2) and SU(3) cases, the new vector-like fermions are quirks; pair production at colliders yields quirk-antiquirk states bound by stable flux tubes that are microscopic but long compared to the new confinement scale. I study the reach of the Tevatron and LHC for the optimistic case that in a significant fraction of events the quirk-antiquirk bound state will lose most of its energy before annihilating as quirkonium.

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“…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%

Towards model-independent approach to the analysis of interference effects in pair production of new heavy quarks

Barducci

Belyaev

Blamey

et al. 2014

J. High Energ. Phys.

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We propose a model independent approach for the analysis of interference effects in the process of QCD pair production of new heavy quarks of different species that decay into Standard Model particles, including decays via flavour changing neutral currents. By adopting as ansatz a simple analytical formula we show that one can accurately describe the interference between two different such particle pairs leading to the same final state using information about masses, total widths and couplings. A study of the effects on differential distributions is also performed showing that, when interference plays a relevant role, the distributions of the full process can be obtained by a simple rescaling of the distributions of either quark contributing to the interference term. We also present the range of validity of the analytical expression that we have found.

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Higgs boson mass, sparticle spectrum, and the little hierarchy problem in an extended MSSM

Cited by 144 publications

References 41 publications

Higgs boson production and decay: Effects from light third generation and vectorlike matter

Higgs boson production and decay: Effects from light third generation and vectorlike matter

Quirks in supersymmetry with gauge coupling unification

Towards model-independent approach to the analysis of interference effects in pair production of new heavy quarks

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