The two-photon width Gamma(gamma gamma) of the eta(c) meson has been measured with the L3 detector at LEP. The eta(c) is studied in the decay modes pi(+)pi(-) pi(+)pi(-), pi(+)pi(-)K(+)K(-), K(s)(0)K(+/-)pi(-/+), K(+)K(-)pi(0), pi(+)pi(-)eta, pi(+)pi(-)eta', and rho(+)rho(-) using an integrated luminosity of 140 pb(-1) at root s similar or equal to 91 GeV and of 52 pb(-1) at root s similar or equal to 183 GeV. The result is Gamma(gamma gamma)(eta(c)) = 6.9 +/- 1.7 star +/- 0.8 sys +/- 2.0(BR) keV. The Q(2) dependence of the eta(c) cross section is studied for Q(2) < 9 GeV2. It is found to be better described by a Vector Meson Dominance model form factor with a J-pole than with a rho-pole. In addition, a signal of 29 +/- 11 events is observed at the chi(c0) mass. Upper limits for the two-photon widths of the chi(c0), chi(c2) and eta(c)' are also given. (C) 1999 Elsevier Science B.V. All rights reserved.

Formation of the eta(c) in two-photon collisions at LEP / Acciarri, M., Achard, P., Adriani, O., AGUILAR BENITEZ, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alviggi, M.g., Ambrosi, G., Anderhub, H., Andreev, V.p., Angelescu, T., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Baksay, L., Balandras, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 461:(1999), pp. 155-166. [10.1016/S0370-2693(99)00784-4]

Formation of the eta(c) in two-photon collisions at LEP

BAGNAIA, Paolo;BARONE, Luciano Maria;FERRONI, Fernando;GENTILE, Simonetta;GIAGU, Stefano;LUCI, Claudio;ORGANTINI G;
1999

Abstract

The two-photon width Gamma(gamma gamma) of the eta(c) meson has been measured with the L3 detector at LEP. The eta(c) is studied in the decay modes pi(+)pi(-) pi(+)pi(-), pi(+)pi(-)K(+)K(-), K(s)(0)K(+/-)pi(-/+), K(+)K(-)pi(0), pi(+)pi(-)eta, pi(+)pi(-)eta', and rho(+)rho(-) using an integrated luminosity of 140 pb(-1) at root s similar or equal to 91 GeV and of 52 pb(-1) at root s similar or equal to 183 GeV. The result is Gamma(gamma gamma)(eta(c)) = 6.9 +/- 1.7 star +/- 0.8 sys +/- 2.0(BR) keV. The Q(2) dependence of the eta(c) cross section is studied for Q(2) < 9 GeV2. It is found to be better described by a Vector Meson Dominance model form factor with a J-pole than with a rho-pole. In addition, a signal of 29 +/- 11 events is observed at the chi(c0) mass. Upper limits for the two-photon widths of the chi(c0), chi(c2) and eta(c)' are also given. (C) 1999 Elsevier Science B.V. All rights reserved.
1999
01 Pubblicazione su rivista::01a Articolo in rivista
Formation of the eta(c) in two-photon collisions at LEP / Acciarri, M., Achard, P., Adriani, O., AGUILAR BENITEZ, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alviggi, M.g., Ambrosi, G., Anderhub, H., Andreev, V.p., Angelescu, T., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Baksay, L., Balandras, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 461:(1999), pp. 155-166. [10.1016/S0370-2693(99)00784-4]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/242053
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