Title

Experimental Investigation of the Two-Photon Widths of the χc0 and the χc2 Mesons

Document Type

Article

Publication Date

7-24-2001

Abstract

Using 12.7fb of data collected with the CLEO detector at CESR, we observed two-photon production of the cc states χ and χ in their decay to Π Π Π Π . We measured Γγγ(χc)×B(χc→Π+Π-Π+Π-) to be 75·13(stat)·8(syst)eV for the χc0 and 6.4·1.8(stat)·0.8(syst)eV for the χ , implying γγγ(χ )=3.76·0.65(stat)·0.41(syst)·1.69(br)keV and Γγγ(χ )=0.53·0.15(stat)·0.06(syst)·0.22(br)keV. Also, cancellation of dominant experimental and theoretical uncertainties permits a precise comparison of Γγγ(χ )/Γγγ(χ ), evaluated to be7.4·2.4(stat)·0.5(syst)·0.9(br), with QCD-based predictions. © 2001 The American Physical Society. -1 − + - + - c0 c2 c2 c0 c2 c0 c2

Publication Name

Physical Review Letters

Volume Number

87

Issue Number

6

DOI

10.1103/PhysRevLett.87.061801

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