Phys. Rev. Lett. 91, 091801 (2003) [4 pages]Interference Study of the χc0(13P0) in the Reaction p̅ p→π0π0Received 4 June 2003; published 28 August 2003 Fermilab experiment E835 has observed p̅ p annihilation production of the charmonium state χc0 and its subsequent decay into π0π0. Although the resonant amplitude is an order of magnitude smaller than that of the nonresonant continuum production of π0π0, an enhanced interference signal is evident. A partial wave expansion is used to extract physics parameters. The amplitudes J=0 and 2, of comparable strength, dominate the expansion. Both are accessed by L=1 in the entrance p̅ p channel. The product of the input and output branching fractions is determined to be B(p̅ p→χc0)×B(χc0→π0π0)=(5.09±0.81±0.25)×10-7. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.091801
DOI:
10.1103/PhysRevLett.91.091801
PACS:
13.25.Gv, 13.75.Cs, 14.40.Gx
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