Search for nearly mass degenerate charginos and neutralinos at LEP - INSPIRE

DataBETA

Search for nearly mass degenerate charginos and neutralinos at LEP

OPAL

Collaboration

Oct, 2002

26 pages

Published in:

Eur.Phys.J.C 29 (2003) 479-489

e-Print:

hep-ex/0210043 [hep-ex]

DOI:

10.1140/epjc/s2003-01237-x

Report number:

CERN-EP-2002-063

Experiments:

CERN-LEP-OPAL

View in:

reference search89 citations

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Abstract: (arXiv)

A search was performed for charginos with masses close to the mass of the lightest neutralino in e+e- collisions at centre-of-mass energies of 189-209 GeV recorded by the OPAL detector at LEP. Events were selected if they had an observed high-energy photon from initial state radiation, reducing the dominant background from two-photon scattering to a negligible level. No significant excess over Standard Model expectations has been observed in the analysed data set corresponding to an integrated luminosity of 570pb-1. Upper limits were derived on the chargino pair-productin cross-section, and lower limits on the chargino mass were derived in the context of the Minimal Supersymmetric Extension of the Standard Model for the gravity and anomaly mediated Supersymmetry breaking scenarios.

Note:

26 pages, 9 figures

electron positron: colliding beams
electron positron: annihilation
supersymmetry: symmetry breaking
sparticle: search for
sparticle: pair production
chargino: decay
R parity: invariance
neutralino
sparticle: mass difference
channel cross section: upper limit

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