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Mass and lifetime limits on new long-lived particles in 300 GeV/c π? interactions |
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| Authors: | J Badier C Bemporad J Boucrot O Callot P Charpentier A M Cnops M Crozon P Delpierre J F Detoeuf G R Giannini R Hammarstr?m P Lariccia R Lorenzi J Mas A Michelini A Tilquin J K Walker NA Collaboration |
| Institution: | 1. Ecole Polytechnique, F-91128, Palaiseau, France 2. Istituto di Fisica, Universita di Pisa, Piazza Torricelli 2, I-56100, Pisa, Italy 3. Laboratoire de l'Accélérateur Linéaire, F-91405, Orsay, France 4. CEN-Saclay, F-91191, Gif-sur-Yvette, France 5. Sezione di Pisa, INFN, I-56010, Pisa, Italy 6. Collège de France, F-75231, Paris, France 7. CERN, CH-1211, Geneva 23, Switzerland |
| Abstract: | A sensitive search has been done for the production of new long-lived and penetrating particles by 300 GeV/c negative pions. No new state —decaying into at least two charged known particles —has been detected with mass above 1 GeV/c2 and lifetime in the range 5·10?11 s to 5·10?7s. We give upper limits on production cross sections, and consequences on the existence of heavy “axion-like” particles, heavy neutrinos and supersymmetric particles. In particular, this experiment excludes the existence of light gluinos with lifetime in the range 5·10?11 to 10?8s: this closes the last “window of opportunity” for gluinos withM<2 GeV/c2 and lifetime measurable in particle physics experiments. |
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