The formation of the eta' in the reaction e(+)e(-)-->e(+)e(-)eta'-->e(+)e(-)pi(+)pi(-)gamma has been measured by the L3 detector at a centre-of-mass energy of 91 GeV. The radiative width of the eta' has been found to be Gamma(gamma gamma)=4.17+/-0.10(stat.)+/-0.27(sys.)keV. The Q(2) dependence of the eta' formation cross section has been measured for Q(2) less than or equal to 10 GeV2 and the eta' electromagnetic transition form factor has been determined. The form factor can be parametrised by a pole form with Lambda=0.900+/-0.046(stat.)+/-0.022(sys.)GeV. It is also consistent with recent non-perturbative QCD calculations. (C) 1998 Elsevier Science B.V.
Measurement of eta '(958) formation in two-photon collisions at LEP1 / M. Acciarri;O. Adriani;M. Aguilar-Benitez;S. Ahlen;J. Alcaraz;G. Alemanni;J. Allaby;A. Aloisio;G. Alverson;M. G. Alviggi;G. Ambrosi;H. Anderhub;V. P. Andreev;T. Angelescu;F. Anselmo;A. Arefiev;T. Azemoon;T. Aziz;P. Bagnaia;L. Baksay;R. C. Ball;S. Banerjee;S. Banerjee;K. Banicz;A. Barczyk;R. Barillere;L. Barone;P. Bartalini;A. Baschirotto;M. Basile;R. Battiston;A. Bay;F. Becattini;U. Becker;F. Behner;J. Berdugo;P. Berges;B. Bertucci;B. L. Betev;S. Bhattacharya;M. Biasini;A. Biland;G. M. Bilei;J. J. Blaising;S. C. Blyth;G. J. Bobbink;R. Bock;A. Bohm;L. Boldizsar;B. Borgia;D. Bourilkov;M. Bourquin;D. Boutigny;S. Braccini;J. G. Branson;V. Brigljevic;I. C. Brock;A. Buffini;A. Buijs;J. D. Burger;W. J. Burger;J. Busenitz;X. D. Cai;M. Campanelli;M. Capell;G. C. Romeo;G. Carlino;A. M. Cartacci;J. Casaus;G. Castellini;F. Cavallari;N. Cavallo;C. Cecchi;M. Cerrada;F. Cesaroni;M. Chamizo;Y. H. Chang;U. K. Chaturvedi;S. V. 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Measurement of eta '(958) formation in two-photon collisions at LEP1
ADRIANI, OSCAR;BECATTINI, FRANCESCO;D'ALESSANDRO, RAFFAELLO;
1998
Abstract
The formation of the eta' in the reaction e(+)e(-)-->e(+)e(-)eta'-->e(+)e(-)pi(+)pi(-)gamma has been measured by the L3 detector at a centre-of-mass energy of 91 GeV. The radiative width of the eta' has been found to be Gamma(gamma gamma)=4.17+/-0.10(stat.)+/-0.27(sys.)keV. The Q(2) dependence of the eta' formation cross section has been measured for Q(2) less than or equal to 10 GeV2 and the eta' electromagnetic transition form factor has been determined. The form factor can be parametrised by a pole form with Lambda=0.900+/-0.046(stat.)+/-0.022(sys.)GeV. It is also consistent with recent non-perturbative QCD calculations. (C) 1998 Elsevier Science B.V.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.