A search for the pseudoscalar meson ηb is performed in two-photon interactions at LEP 2 with an integrated luminosity of 699 pb−1 collected at e+e− centre-of-mass energies from 181 GeV to 209 GeV. One candidate event is found in the six-charged-particle final state and none in the four-charged-particle final state, in agreement with the total expected background of about one event. Upper limits of eV, eV are obtained at 95% confidence level, which correspond to upper limits of 9.0% and 25% on these branching ratios.

Search for γγ→ηb in e+e− collisions at LEP 2 / A. Heister, S. Schael, R. Barate, R. Brunelière, I. De Bonis, D. Decamp, C. Goy, S. Jezequel, J.-P. Lees, F. Martin, E. Merle, M.-N. Minard, B. Pietrzyk, B. Trocmé, G. Boix, S. Bravo, M.P. Casado, M. Chmeissani, J.M. Crespo, E. Fernandez, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 530:(2002), pp. 56-66. [10.1016/S0370-2693(02)01329-1]

Search for γγ→ηb in e+e− collisions at LEP 2

FOCARDI, ETTORE;CIULLI, VITALIANO;
2002

Abstract

A search for the pseudoscalar meson ηb is performed in two-photon interactions at LEP 2 with an integrated luminosity of 699 pb−1 collected at e+e− centre-of-mass energies from 181 GeV to 209 GeV. One candidate event is found in the six-charged-particle final state and none in the four-charged-particle final state, in agreement with the total expected background of about one event. Upper limits of eV, eV are obtained at 95% confidence level, which correspond to upper limits of 9.0% and 25% on these branching ratios.
2002
530
56
66
A. Heister;S. Schael;R. Barate;R. Brunelière;I. De Bonis;D. Decamp;C. Goy;S. Jezequel;J.-P. Lees;F. Martin;E. Merle;M.-N. Minard;B. Pietr...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/658120
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