Search for single top production in e +e - collisions at √s = 189-202 GeV

R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. P. Lees, F. Martin, E. Merle, M. N. Minard, B. Pietrzyk, H. Przysiezniak, R. Alemany, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Graugés, A. JusteM. Martinez, G. Merino, R. Miquel, Ll M. Mir, P. Morawitz, A. Pacheco, I. C. Park, I. Riu, A. Colaleo, D. Creanza, M. De Palma, G. Iaselli

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7 Citations (Scopus)

Abstract

Single top production via flavour changing neutral currents in the reactions e +e - → t̄c/u is searched for in approximately 411 pb -1 of data collected by ALEPH at centre-of-mass energies in the range between 189 and 202 GeV. In total, 58 events are selected in the data to be compared with 50.3 expected from Standard Model backgrounds. No deviation from the Standard Model expectation is observed. Upper limits at 95% CL on single top production cross sections at √s = 189-202 GeV are derived. A model-dependent limit on the sum of branching ratios BR(t → Zc) + BR(t → Zu) < 17% is obtained. (C) 2000 Elsevier Science B.V.
Original languageEnglish
Pages (from-to)33-45
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume494
Issue number1-2
DOIs
Publication statusPublished - 23 Nov 2000

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