Update of the search for charginos nearly mass-degenerate with the lightest neutralino

Christopher Parkes, P. Abreu, W. Adam, T. Adye, P. Adzic, I. Ajinenko, Z. Albrecht, T. Alderweireld, G. D. Alekseev, R. Alemany, T. Allmendinger, P. P. Allport, S. Almehed, U. Amaldi, N. Amapane, S. Amato, E. G. Anassontzis, P. Andersson, A. Andreazza, S. AndringaP. Antilogus, W. D. Apel, Y. Arnoud, B. Åsman, J. E. Augustin, A. Augustinus, P. Baillon, A. Ballestrero, P. Bambade, F. Barao, G. Barbiellini, R. Barbier, D. Y. Bardin, G. Barker, A. Baroncelli, M. Battaglia, M. Baubillier, K. H. Becks, M. Begalli, A. Behrmann

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The data collected by DELPHI in 1998 at the centre-of-mass energy of 189 GeV have been used to update the search for charginos nearly mass-degenerate with the lightest supersymmetric particle, which is assumed to be the lightest neutralino. Mass differences below ΔM = 3 GeV/c 2 are considered. No excess of events with respect to the Standard Model expectation has been observed, and exclusions in the plane of ΔM versus chargino mass are given. The new ΔM independent lower limit on the mass of the chargino is 62.4 GeV/c 2 in the higgsino scenario (which includes the gaugino mass unification scenario), if all sfermions are heavier than the lightest chargino. In the approximation of large sfermion masses the limit is 59.8 GeV/c 2, independently of the field content. (C) 2000 Published by Elsevier Science B.V.
    Original languageEnglish
    Pages (from-to)95-106
    Number of pages11
    JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume485
    Issue number1-3
    DOIs
    Publication statusPublished - 13 Jul 2000

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