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Nelson, B.; Knasel, T.M.; Lindquist, J.; Phillips, Peter R.; Reibel, K.; Romanowski, T. A.; Schwartz, Matthew D.; Stevens, A.; Sumner, R.L.; Swallow, E. C.; Watson, J.M.; Winston, R.; Wolfe, D.

doi:10.1103/physrevlett.31.901

Cited by 12 publications

(13 citation statements)

References 29 publications

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“…These data [27][28][29][30][31][32] have been obtained a few decades ago with low intensity beams and therefore are not very extensive and not of high quality. Nevertheless, we will show that they give sufficient constraints on constructing models of KY interactions.…”

Section: ͑10͒mentioning

confidence: 99%

Dynamical coupled-channel model of kaon-hyperon interactions

et al. 2004

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The pi N --> KY and KY --> KY reactions are studied using a dynamical coupled-channel model of meson-baryon interactions at energies where the baryon resonances are strongly excited. The channels included are: pi N, K \Lambda, and K\Sigma. The resonances considered are: N^* [S_{11}(1650), P_{11}(1710), P_{13}(1720),D_{13}(1700)]; \Delta^* [S_{31}(1900), P_{31}(1910), P_{33}(1920)]; \Lambda ^* [S_{01}(1670), P_{01}(1810)] \Sigma^* [P_{11}(1660), D_{13}(1670)]; and K^*(892). The basic non-resonant \pi N --> KY and KY --> KY transition potentials are derived from effective Lagrangians using a unitary transformation method. The dynamical coupled-channel equations are simplified by parametrizing the pi N -->pi N amplitudes in terms of empirical pi N partial-wave amplitudes and a phenomenological off-shell function. Two models have been constructed. Model A is built by fixing all coupling constants and resonance parameters using SU(3) symmetry, the Particle Data Group values, and results from a constituent quark model. Model B is obtained by allowing most of the parameters to vary around the values of model A in fitting the data. Good fits to the available data for pi^- p to K^0 \Lambda, K^0 \Sigma^0 have been achieved. The investigated kinematics region in the center-of-mass frame goes from threshold to 2.5 GeV. The constructed models can be imbedded into associated dynamical coupled-channel studies of kaon photo- and electro-production reactions.Comment: 35 pages, 11 Figure

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Section: ͑10͒mentioning

confidence: 99%

Dynamical coupled-channel model of kaon-hyperon interactions

et al. 2004

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“…The only possible signal for SUSY is then pair production of two gluinos. Gluinos can only be produced via two processes: e + e − → qq g g [27,28,29], which can take place at tree-level, and e + e − → g g [30,31,28], which takes place via loop diagrams (involving squarks and quarks). As discussed later, the latter process is very model dependent and can be highly suppressed.…”

Section: Constraints From Lep and Lep2mentioning

confidence: 99%

Heavy gluino as the lightest supersymmetric particle

1999

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We consider the possibility that the lightest supersymmetric particle is a heavy gluino. After discussing models in which this is the case, we demonstrate that the g-LSP could evade cosmological and other constraints by virtue of having a very small relic density. We then consider how neutral and charged hadrons containing a gluino will behave in a detector, demonstrating that there is generally substantial apparent missing momentum associated with a produced g-LSP. We next investigate limits on the g-LSP deriving from LEP, LEP2 and RunI Tevatron experimental searches for excess events in the jets plus missing momentum channel and for stable heavily-ionizing charged particles. The range of m g that can be excluded depends upon the path length of the g in the detector, the amount of energy it deposits in each hadronic collision, and the probability for the g to fragment to a pseudo-stable charged hadron after a given hadronic collision. We explore how the range of excluded m g depends upon these ingredients, concluding that for non-extreme cases the range 3 GeV < ∼ m g < ∼ 130 − 150 GeV can be excluded at 95% CL based on currently available OPAL and CDF analyses. We find that RunII at the Tevatron can extend the excluded region (or discover the g) up to m g ∼ 160 − 180 GeV. For completeness, we also analyze the case where the g is the NLSP (as possible in gauge-mediated supersymmetry breaking) decaying via g → g + gravitino. We find that the Tevatron RunI data excludes m g ≤ 240 GeV. Finally, we discuss application of the procedures developed for the heavy g-LSP to searches for other stable strongly interacting particles, such as a stable heavy quark.

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“…They have been studied in ÿ P ! K 0 near the K threshold [23,24] in an attempt to determine the relative -parity, and more recently [25] in P ! 0 P near the N threshold, where they can yield informations on the -nucleon scattering lengths.…”

mentioning

confidence: 99%

Determination of thea0−a2Pion Scattering Length fromK+→π+
Cabibbo
¹

2004
Phys. Rev. Lett.
147
7
190
0
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Search for Structure inπ−p→ΛK0atΣK

Cited by 12 publications

References 29 publications

Dynamical coupled-channel model of kaon-hyperon interactions

Dynamical coupled-channel model of kaon-hyperon interactions

Heavy gluino as the lightest supersymmetric particle

Determination of thea0−a2Pion Scattering Length fromK+→π+
Cabibbo
¹

2004
Phys. Rev. Lett.
147
7
190
0
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Search for Structure inπ−p→ΛK0atΣK

Cited by 12 publications

References 29 publications

Dynamical coupled-channel model of kaon-hyperon interactions

Dynamical coupled-channel model of kaon-hyperon interactions

Heavy gluino as the lightest supersymmetric particle

Determination of thea0−a2Pion Scattering Length fromK+→π+Cabibbo1 2004Phys. Rev. Lett.14771900View full textAdd to dashboardCite

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Determination of thea0−a2Pion Scattering Length fromK+→π+
Cabibbo
¹

2004
Phys. Rev. Lett.
147
7
190
0
View full text Add to dashboard Cite