Search for Longlived Charged Massive Particles at CDF.pdfVIP

Search for Long-lived Charged Massive Particles at CDF Amy Connolly For the CDF Collaboration Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA Email: connolly@cdfsg6.lbl.gov A search for long-lived charged massive particles in CDF’s Run1b data sample is presented. The search looks for highly ionizing tracks which would result from slowly moving massive particles. We search for strongly produced particles using a stable color triplet quark as a reference model, and a separate search was performed for weakly produced particles using long-lived sleptons in Gauge- Mediated Supersymmetry Breaking as a reference model. No excess over background was observed, and we derive limits on the cross-sections for production of these particles. Prospects for RunII are 9 also discussed. 9 9 1 I. INTRODUCTION r p A Many models for new physics include particles which may live long enough to traverse our detector. Such a particle may be long-lived due to a new conserved quantum number (such as R-parity in SUSY), or its decays may be 8 suppressed. If these particles are charged, they could be detected directly [1,2,4]. 1 The most stringest limits from direct searches for such particles come from LEPII and CDF. LEPII has set mass v limits of about 82 GeV/c2 on stable sleptons within the framework of Gauge-Mediated Supersymmetry Breaking 0 2 1 (GMSB) [