Search for pair-production of long-lived heavy charged particles in e +e − annihilation

A search for pair-production of long-lived, heavy, singly-charged particles has been performed with data collected by the ALEPH detector at a centre-of-mass energy of 172 GeV. Data at s =161, 136 and 130 GeV are also included to improve the sensitivity to lower masses. No candidate is found in the d...

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Veröffentlicht in:	Physics letters. B 1997-07, Vol.405 (3), p.379-388
Hauptverfasser:	Barate, R, Decamp, D, Ghez, P, Goy, C, Nief, J.-Y, Casado, M.P, Miquel, R, Orteu, S, Pascual, A, Riu, I, Teubert, F, de Palma, M, Gelao, G, Ruggieri, F, Huang, X, Abbaneo, D, Frank, M, Lehraus, I, Mato, P, Moneta, L, Pusztaszeri, J.-F, Schneider, O, Wachsmuth, H, Barrès, A, Boyer, C, Falvard, A, Monteil, S, Hansen, P.H, Wäänänen, A, Markou, C, Blondel, A, Valassi, A, Corden, M, Jaffe, D.E, Antonelli, A, Bologna, G, Casper, D, Passalacqua, L, Knowles, I.G, Geweniger, C, Putzer, A, Werner, S, Binnie, D.M, Cameron, W, Dornan, P.J, Girone, M, Martin, E.B, Stacey, A.M, Kuhn, D, Crawford, G, Whelan, E.P, Hoffmann, C, Rohne, E, Bujosa, G, Calvet, D, Coyle, P, Konstantinidis, N, Motsch, F, Rousseau, D, Talby, M, Ragusa, F, Büscher, V, Kroha, H, Lutz, G, Wolf, G, Grivaz, J.-F, Schune, M.-H, Zerwas, D, Calderini, G, Carpinelli, M, Dell'Orso, R, Ferrante, I, Giassi, A, Ligabue, F, Lusiani, A, Messineo, A, Sciabà, A, Tenchini, R, Tonelli, G, Vannini, C, Blair, G.A, Chambers, J.T, Thompson, J.C, Lançon, E, Rosowsky, A, Trabelsi, A, Vallage, B, Taylor, G, Combley, F, Newton, W.M, Cowan, G, Apollonio, M, Williams, R.W, González, S, Hayes, O.J, Jin, S, Scott, I.J, Wu, Sau Lan, Wu, X, Zobernig, G
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	A search for pair-production of long-lived, heavy, singly-charged particles has been performed with data collected by the ALEPH detector at a centre-of-mass energy of 172 GeV. Data at s =161, 136 and 130 GeV are also included to improve the sensitivity to lower masses. No candidate is found in the data. A model-independent 95% confidence level upper limit on the production cross section at 172 GeV of 0.2–0.4 pb is derived for masses between 45 and 86 GeV/ c 2. This cross section limit implies, assuming the MSSM, a lower limit of 67 (69) GeV/ c 2 on the mass of right- (left-) handed long-lived scalar taus or scalar muons and of 86 GeV/ c 2 on the mass of long-lived charginos.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/S0370-2693(97)00715-6