Supersymmetry — lost or found?

Barnett, R. M.; Haber, Howard E.; Kane, Gordon L.

doi:10.1016/0550-3213(86)90135-5

Cited by 85 publications

(18 citation statements)

References 89 publications

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“…Turning now to cross section calculations, I am not aware of any recent pQCD calculations of gluino production at a hadron collider, except for very massive gluinos. The old analyses [3,45] should be updated, making an attempt to estimate the uncertainty in the gluino distribution, as well as including 1-loop corrections which have proved very important for ordinary pQCD predictions. From deep inelastic and Drell-Yan experiments, the quark and antiquark distributions are reasonably well fixed.…”

Section: Theoretical Comments: Gluino Lifetime and Production Estimatesmentioning

confidence: 99%

Experiments to find or exclude a long-lived, light gluino

Farrar

1995

Phys. Rev. D

104

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Gluinos in the mass range ∼ 1 1 2 − 3 1 2 GeV are absolutely excluded. Lighter gluinos are allowed, except for certain ranges of lifetime. Only small parts of the mass-lifetime parameter space are excluded for larger masses unless the lifetime is shorter than ∼ 2 × 10 −11 mg 1GeV sec. Refined mass and lifetime estimates for R-hadrons are given, present direct and indirect experimental constraints are reviewed, and experiments to find or definitively exclude these possibilities are suggested.In this paper I address the question of whether long-lived gluinos having mass less than ∼ 1.5 or greater than 3.5 GeV are excluded on other grounds.Many experiments which are commonly cited as ruling out gluinos of this mass range actually provide only weak limits when one takes account of the gluino lifetime. These experiments as well as the most powerful indirect constraints, which are also presently unable to exclude this mass range, will be reviewed below. My purpose here is to propose tests which will unambiguously demonstrate or exclude the existance of light gluinos.An inevitable consequence of the existance of a long-lived gluino is the existance of neutral hadrons containing them. Generically, hadrons containing a single gluino are called R-hadrons [12]. The lightest of these would be the neutral, flavor singlet gg "glueballino", called R 0 . There would also be R-mesons,qqg, and R-baryons,qqqg, with theqq or qqq in a color octet.Unlike ordinary baryons which are unable on account of fermi statistics to be in a flavor singlet state, there is a neutral flavor-singlet R-baryon, udsg, called S 0 below. It should be particularly strongly bound by QCD hyperfine interactions, and probably is the lightest of the R-baryons [2,13], even lighter than the R-nucleons.The strategy pursued here is to identify production and detection mechanisms for the R 0 for which reliable rate estimates can be made, so that searches which are sufficiently sensitive will definitively rule them out or find them. First, we use theoretical arguments to estimate R-hadron masses as a function of gluino mass. Then experiments are proposed to settle the question.2 R-hadron mass estimates photon energy spectrum, and thus be excluded by CUSB.

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Section: Theoretical Comments: Gluino Lifetime and Production Estimatesmentioning

confidence: 99%

Experiments to find or exclude a long-lived, light gluino

Farrar

1995

Phys. Rev. D

104

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“…Experimental limits are rather indirect. If produced in accelerator experiments, charged or colored super partners could be readily detected, and so lower limits on their masses can be obtained (98). However, although neutral LSPs may be produced, they will not be directly detectable.…”

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confidence: 99%

Detection of Cosmic Dark Matter

Primack¹,

Seckel²,

Sadoulet³

1988

Annu. Rev. Nucl. Part. Sci.

446

235

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“…The first process is independent of the squark mass while there is some squark mass dependence in the second process due to the possibility of t and u channel squarks. Neglecting the gluino mass the parton level differential cross sections for gluino pair production are (from [11])…”

mentioning

confidence: 99%

Inclusive JetETDistributions and Light Gluinos

Clavelli¹,

Терехов²

1996

Phys. Rev. Lett.

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In the light gluino variant of the minimal supersymmetric model gluino pairs can be readily produced in collider experiments even if the squarks are arbitrarily heavy. This enhances the jet transverse energy distributions. In addition the slower running of the strong coupling constant in the presence of light gluinos leads to a further enhancement at higher transverse energies relative to the standard QCD expectations. Finally, the enhanced squark gluino production would lead to a Jacobian peak in the E T distribution at about MQ/2. These effects are of about the right magnitude to explain anomalies observed by the CDF and D0 collaborations.

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Supersymmetry — lost or found?

Cited by 85 publications

References 89 publications

Experiments to find or exclude a long-lived, light gluino

Experiments to find or exclude a long-lived, light gluino

Detection of Cosmic Dark Matter

Inclusive JetETDistributions and Light Gluinos

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