CERN Accelerating science

Preprints
Report number	DELPHI-97-119 ; HEP'97 #589
Title	Search for R-Parity violating effects at $\sqrt{s}$ 161 and 172 GeV
Author(s)	Arnoud, Y (Grenoble, CEN) ; Barbier, R (Lyon, IPN) ; Berat, C (Grenoble, CEN) ; Witek, M (Cracow, INP) ; Vassilopoulos, N (Oxford U.) ; Sajot, G (Grenoble, CEN) ; Richard, F (Orsay) ; Nicolaidou, R (Grenoble, CEN) ; Pimenta M (LIP, Lisbon) ; Papadopoulou, Th D (Natl. Tech. U., Athens) ; Palka, H (Cracow, INP) ; Onofre, A (LIP, Lisbon) ; Lola, S (CERN) ; Kluit, P (NIKHEF, Amsterdam) ; Katsanevas, S (Lyon, IPN) ; Gris, P ; Fichet, S (Paris U., VI-VII) ; Cieslik, K (Cracow, INP) ; Boonekamp, M
Publication	1997
Imprint	1997
Number of pages	49
Presented at	International Europhysics Conference on High-Energy Physics, Jerusalem, Israel, 19 - 25 Aug 1997
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LEP ; DELPHI
Abstract	Searches for charginos, neutralinos and sleptons in e+ e collisions at center-of-mass energies of 161 and 172 GeV have been performed on DELPHI data, under the assumptions that R-Parity is not conserved and that the dominant R-Parity violating couplings involve only leptonic or only quark elds. Particular emphasis is given in decays involving, the minimally constrained by low-energy studies, third generation couplings including 's and b quarks in the decay products. Squark decays are also studied for the same energies assuming that the dominant R-Parity violating couplings involve a mixture of leptonic and quark elds. In the above studies, it is assumed that the strength of the couplings is such that the lifetimes can be neglected. These searches are used to constraint domains of the parameter space, previously explored under the assumption of R-Parity conservation. Further, the single sparticle production, possible when R-parity is not conserved, is studied. In particular the single squark production and the production of a sneutrino resonance in the s-channel decaying to a single chargino and a charged lepton are studied. Finally, DELPHI analysis of the indirect eects of particles carrying lepton and quark numbers, exchanged in the t-channel, are interpreted in terms of R-parity violating squark exchanges.
Other source	Inspire