arXiv subjects

Geert Jan van Oldenborgh

Publications and source records attributed to Geert Jan van Oldenborgh.

20 records · Page 2Linked to original sources

arXiv1993

Supersymmetric Signals in $γγ$ Collisions

We study the occurrence of final states with only an electron-positron pair and missing transverse momentum as a signal of \susy\ in photon-photon collisions. Suitable high energy photon beams may be provided at linear colliders by back-scattering laser beams on electron beams. The final states considered represent a typical signature for the production and decay of selctron and chargino pairs within the \mssm. We show that, away from the kinematical threshold, selctrons produce this signal far more abundantly than charginos. The standard model background is dominated by W-pair production. We propose a series of kinematical cuts which reduce this background to an acceptable level. With a 1 TeV collider operated in the $γγ$-mode, we find that interesting and complementary tests of \susic\ models can be performed for selctron masses up to 350 GeV.

hep-ph↗

arXiv1992

Supersymmetric Signals in Electron-Photon Collision

Associated selectron-neutralino production in the process $e^-γ\to\tilde e^-\tildeχ^0$ provides a striking supersymmetric signal: events with a single high $p_\perp$ electron and otherwise only invisible particles. For $e^-γ$ collisions obtained at high energy linear colliders through back-scattering of a laser beam, this reaction is shown to be complementary to selectron pair production in the processes $e^+e^-\to\tilde e^+\tilde e^-$ and $e^-e^-\to\tilde e^-\tilde e^-$, and to be a probe of heavy selectrons beyond the kinematical limit of pair production. The standard model background from $e^-γ\to e^-Z^0$ and $W^-ν$ is studied and substantially reduced by rapidity and transverse momentum cuts. The minimum required integrated luminosities for observing this \susic\ signal are given as functions of several model parameters and collider energies.

hep-ph↗