Direct search for light gluinos NA48 Collaboration

AbstractWe present the results for a direct search for light gluinos through the appearance of h“3p 0 with high transversemomentum in the vacuum tank of the NA48 experiment at CERN. We find one event within a lifetime range of 10 y9 –10 y3 s and another one between 10 y10 –10 9 s. Both events are consistent with the expected background from neutrons in thebeam, produced by 450 GeV protons impinging on the Be targets, which interact with the residual air in the tank. From thesedata we give limits on the production of the hypothetical gg ˜˜ bound state, the R 0 hadron, and its R 0 “hg decay in the R 0 mass range between 1 and 5 GeV. q1999 Elsevier Science B.V. All rights reserved. 1 Present address: CERN, CH-1211 Geneva 23, Switzerland. 2 Present address: Physics-Astronomy Building, Michigan StateUniversity, East Lansing, MI 48824, USA. 3 Permanent address: Dipartimento di Fisica Sperimentaledell’Universita e Sezione dell’INFN di Torino, I-10125 Torino, ` Italy. 4 Corresponding author. E-mail: mayda.velasco@cern.ch