Two-photon formation of the charmonium resonance chi(c2), has been studied with the L3 detector at LEP. The chi(c2) is identified through its decay chi(c2) --> gamma J/psi, with a subsequent decay J/psi --> e(+)e(-) or J/psi --> mu(+)mu(-). With an integrated luminosity of 140 pb(-1) at root s similar or equal to 91 GeV and 52 pb(-1) at root s similar or equal to 183 GeV, we measure the two-photon width of the chi(c2) to be Gamma(gamma gamma)(chi(c2)) = 1.02 +/- 0.40 (stat.) +/- 0.15 (sys.) +/- 0.09(BR.) keV. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

chi(c2) formation in two-photon collisions at LEP / M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, M. G. Alviggi, G. Ambrosi, H. Anderhub, V. P. Andreev, T. Angelescu, F. Anselmo, A. Arefiev, T. Azemoon, T. Aziz, P. Bagnaia, L. Baksay, A. Balandras, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 453:(1999), pp. 73-82. [10.1016/S0370-2693(99)00279-8]

chi(c2) formation in two-photon collisions at LEP

ADRIANI, OSCAR;BECATTINI, FRANCESCO;D'ALESSANDRO, RAFFAELLO;
1999

Abstract

Two-photon formation of the charmonium resonance chi(c2), has been studied with the L3 detector at LEP. The chi(c2) is identified through its decay chi(c2) --> gamma J/psi, with a subsequent decay J/psi --> e(+)e(-) or J/psi --> mu(+)mu(-). With an integrated luminosity of 140 pb(-1) at root s similar or equal to 91 GeV and 52 pb(-1) at root s similar or equal to 183 GeV, we measure the two-photon width of the chi(c2) to be Gamma(gamma gamma)(chi(c2)) = 1.02 +/- 0.40 (stat.) +/- 0.15 (sys.) +/- 0.09(BR.) keV. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
1999
453
73
82
M. Acciarri;P. Achard;O. Adriani;M. Aguilar-Benitez;J. Alcaraz;G. Alemanni;J. Allaby;A. Aloisio;M. G. Alviggi;G. Ambrosi;H. Anderhub;V. P. ...espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/775442
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 25
social impact