# Search for a Scalar Top almost degenerate with the lightest Neutralino in $e^+ e^-$ collisions at $\sqrt{s}$ up to 202 GeV

Abstract : Data collected at centre-of-mass energies from 189 GeV to 202 GeV by the ALEPH detector at LEP, corresponding to an integrated luminosity of 411 pb-1, are analysed in a search for the scalar top in the decay channels 'stop -> c/u neutralino' for small mass differences between the stop and the lightest neutralino. No evidence for deviations from the Standard Model expectation is found and a lower limit of 59 GeV/c**2 is set for the stop mass, independent of the stop to neutralino mass difference and of the stop lifetime.
Document type :
Journal articles

Cited literature [17 references]

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Submitted on : Friday, September 15, 2000 - 1:53:45 PM
Last modification on : Sunday, June 26, 2022 - 11:42:46 AM
Long-term archiving on: : Friday, May 29, 2015 - 5:05:42 PM

### Identifiers

• HAL Id : in2p3-00005671, version 1

### Citation

R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, et al.. Search for a Scalar Top almost degenerate with the lightest Neutralino in $e^+ e^-$ collisions at $\sqrt{s}$ up to 202 GeV. Physics Letters B, Elsevier, 2000, 488, pp.234-246. ⟨in2p3-00005671⟩

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