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T. Skwarnicki
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J. C. Wang
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G. Bonvicini
D. Cinabro
M. Dubrovin
A. Lincoln
A. Bornheim
S. P. Pappas
A. J. Weinstein
R. A. Briere
G. P. Chen
J. Chen
T. Ferguson
G. Tatishvili
H. Vogel
M. E. Watkins
J. L. Rosner
N. E. Adam
J. P. Alexander
K. Berkelman
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J. E. Duboscq
K. M. Ecklund
R. Ehrlich
L. Fields
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L. Gibbons
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S. Z. Li
R. Poling
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A. Smith

Published in:

Physical Review D 73,7 (2006) 071101;


The two-photon width of chi(c2)(P-3(2)) state of charmonium has been measured using 14.4 fb(-1) of e(+)e(-) data taken at root s=9.46-11.30 GeV with the CLEO III detector. The gamma gamma-fusion reaction studied is e(+)e(-)-> e(+)e(-)gamma gamma, gamma gamma ->chi(c2)->gamma J/psi ->gamma e(+)e(-)(mu(+)mu(-)). We measure Gamma(gamma gamma)(chi(c2))B(chi(c2)->gamma J/psi)B(J/psi -> e(+)e(-)+mu(+)mu(-))=13.2 +/- 1.4(stat)+/- 1.1(syst) eV, and obtain Gamma(gamma gamma)(chi(c2))=559 +/- 57(stat)+/- 48(syst)+/- 36(br) eV. This result is in excellent agreement with the result of gamma gamma-fusion measurement by Belle and is consistent with that of the (p) over barp ->chi(c2)->gamma gamma measurement, when they are both reevaluated using the recent CLEO result for the radiative decay chi(c2)->gamma J/psi.


heavy quarkonia;; decay-rates;; cleo;; resonance;; detector

Date of this Version

January 2006



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