2021 Impact factor 4.991
Particles and Fields

Eur. Phys. J. C 25, 339-351 (2002)
DOI: 10.1007/s10052-002-01005-z

Search for gauge mediated SUSY breaking topologies in e +e - collisions at centre-of-mass energies up to 209 GeV

The ALEPH Collaboration

( Received: 14 March 2002 / Published online: 20 September 2002 )

A total of 628 $\mbox{\,pb$^{-1}$ }$ of data collected with the ALEPH detector at centre-of-mass energies from 189 to 209 GeV is analysed in the search for gauge mediated SUSY breaking (GMSB) topologies. These topologies include two acoplanar photons, non-pointing single photons, acoplanar leptons, large impact parameter leptons, detached slepton decay vertices, heavy stable charged sleptons and multi-leptons plus missing energy final states. No evidence is found for new phenomena, and lower limits on masses of supersymmetric particles are derived. A scan of a minimal GMSB parameter space is performed and lower limits are set for the next-to-lightest supersymmetric particle (NLSP) mass at 54 $\mbox{\,GeV$/c^2$ }$ and for the mass scale parameter $\Lambda$ at 10 $\mbox{\,TeV$/c^2$ }$, independently of the NLSP lifetime. Including the results from the neutral Higgs boson searches, a NLSP mass limit of 77 $\mbox{\,GeV$/c^2$ }$ is obtained and values of $\Lambda$ up to 16 $\mbox{\,TeV$/c^2$ }$ are excluded.

© Società Italiana di Fisica, Springer-Verlag 2002