Reach of Fermilab Tevatron upgrades in gauge-mediated supersymmetry breaking models

Baer, Howard; Mercadante, P. G.; Tata, Xerxes; Wang, Yili

doi:10.1103/physrevd.60.055001

Cited by 45 publications

(66 citation statements)

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“…We can imagine other physics that may make it possible to circumvent experimental limits such as those from b → sγ. For example, it has been pointed out [29] that if the right-handed neutrino mass is significantly below the GUT scale and if m 2 10 = 2m 2 16 , third generation scalars would be radiatively driven to much lower masses than other matter scalars, and further, that when D-terms are included, radiative electroweak symmetry breaking is still possible [30]. In this case, since the degeneracy between squarks is badly broken, it is possible that gluino-mediated contributions to b → sγ (which are generally thought to be small) may be significant.…”

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confidence: 99%

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Superparticle mass spectra fromSO(10)grand unified models with Yukawa coupling unification

et al. 2000

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We examine the spectrum of superparticles obtained from the minimal SO(10) grand unified model, where it is assumed the gauge symmetry breaking yields the Minimal Supersymmetric Standard Model (MSSM) as the effective theory at M GU T ∼ 2 × 10 16 GeV. In this model, unification of Yukawa couplings implies a value of tan β ∼ 45 − 55. At such high values of tan β, assuming universality of scalar masses, the usual mechanism of radiative electroweak symmetry breaking breaks down. We show that a set of weak scale sparticle masses consistent with radiative electroweak symmetry breaking can be generated by imposing non-universal GUT scale scalar masses consistent with universality within SO(10) plus extra D-term contributions associated with the reduction in rank of the gauge symmetry group when SO(10) spontaneously breaks to SU (3)×SU (2)×U (1). We comment upon the consequences of the sparticle mass spectrum for collider searches for supersymmetry. One implication of SO(10) unification is that the light bottom squark can be by far the lightest of the squarks. This motivates a dedicated search for bottom squark pair production at pp and e + e − colliders.PACS numbers: 14.80. Ly, 13.85.Qk, 11.30.Pb Typeset using REVT E X 1 Unification of the Standard Model (SM) of strong, weak and electromagnetic interactions within a single Lie group such as SU(5) or SO(10) has a long history and many attractive features [1]. SU(5) is the smallest grand unifying group, and predicts the quantization of electric charge, the unification of gauge couplings and the unification of bottom and tau Yukawa couplings at scales of Q = M GU T ≃ 10 15 GeV [2]. The SO(10) theory incorporates all the matter fields of the SM into the 16-dimensional spinor representation, ψ 16 , of SO(10) [3]. In minimal SO(10), not only the gauge couplings but all the Yukawa couplings (within a generation) are unified at Q = M GU T . If the right-handed neutrino field present in ψ 16 acquires a large Majorana mass, it decouples from the theory, and a small neutrino mass is induced via the see-saw mechanism [4].The supersymmetric version of this model, with supersymmetry (SUSY) softly broken at a scale < ∼ 1 TeV naturally stabilizes the hierarchy between the weak scale and the grandunification scale. Supersymmetry also raises the unification scale to M GU T ≃ 2 × 10 16 GeV, which helps reduce the rate for proton decay to below the level of experimental bounds. In addition, the introduction of supersymmetry with soft SUSY breaking (SSB) masses of order the weak scale allows for the near unification of gauge coupling constants [5]. In supergravity-based models, it is usually assumed that all scalar masses receive a common, while all gauginos receive a common mass m 1/2 and all trilinear SSB terms unify to A 0 . The SSB masses and couplings are then evolved via renormalization group equations (RGEs) fromHu term is driven to negative values, which results in radiative breaking of electroweak symmetry, provided the top quark mass is large (e.g. 175 GeV).In addition...

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“…The exception in this case is that theb 1 mass is only 140 GeV, and is directly accessible to Fermilab Tevatron collider searches, according to Ref. [23].…”

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Superparticle mass spectra fromSO(10)grand unified models with Yukawa coupling unification

et al. 2000

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“…The most difficult scenario is the stau NLSP where Tevatron reach would correspond to a gluino mass of about 800 GeV while in the most favorable scenario (co-NLSP) the reach will extend up to gluino mass of 1000 GeV [13]. In similar studies for the LHC [14] it was found that the LHC will have a reach of mg ∼ 3 TeV in the favorable scenario of co-NLSP and mg ∼ 2 TeV in the stau NLSP scenarios.…”

Section: Gmsbmentioning

confidence: 68%

“…tan β is also important to determine the nature of the NLSP. In the studies of reference [13,14] C grav is set to 1, which permits the prompt decay of the NLSP, neglecting possible handles coming from tracks or displaced vertices, so this reach projections are conservatives. In a given region the studies can be presented as a function of Λ, which sets the mass scale of the model.…”

Section: Gmsbmentioning

confidence: 99%

Search for supersymmetry at the LHC

Mercadante¹

2004

Braz. J. Phys.

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“…In GMSB theories one introduces vector-like quarks and leptons whose role is to break supersymmetry. These theories have received considerable attention in recent years [3], largely due to their high predictability and their emphasis on a dynamical origin for SUSY breaking.…”

Section: Introductionmentioning

confidence: 99%

Supersymmetric spectrum in SO(10) GUTs with gauge-mediated supersymmetry breaking

1999

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We investigate a large class of supersymmetric SO(10) grand unified theories within the framework of gauge-mediated supersymmetry breaking. We start with the most general messenger sector and imbedd the standard model gauge group into eitherWe find that the conditions of the perturbativity of the gauge couplings and unification at the GUT scale severely restrict the messenger sector and lead to testable phenomenological predictions for the sparticle masses. One of the most notable features of the class of supersymmetric SO(10) grand unified theories introduced here is that among the many possible cases there are only a few consistent models, all of which share an essentially unique mass spectrum.

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Reach of Fermilab Tevatron upgrades in gauge-mediated supersymmetry breaking models

Cited by 45 publications

References 46 publications

Superparticle mass spectra fromSO(10)grand unified models with Yukawa coupling unification

Superparticle mass spectra fromSO(10)grand unified models with Yukawa coupling unification

Search for supersymmetry at the LHC

Supersymmetric spectrum in SO(10) GUTs with gauge-mediated supersymmetry breaking

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