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Observation of e(+)e(-) -> eta J/psi at center-of-mass energy root s=4.009 GeV

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Tapan, İlhan

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Ablikim, M.
Achasov, Mikhail N.
Ambrose, D. J.
An, Fenfen F.
An, Q.
An, Z. H.
Bai, J. Z.
Ban, Y.
Becker, J.
Bennett, J. V.

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American Physical Society

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Abstract

Using a 478 pb(-1) data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider storage ring at a center-of-mass energy of root s = 4.009 GeV, the production of e(+)e(-) -> eta J/psi is observed for the first time with a statistical significance of greater than 10 sigma. The Born cross section is measured to be (32.1 +/- 2.8 +/- 1.3) pb, where the first error is statistical and the second systematic. Assuming the eta J/psi signal is from a hadronic transition of the psi(4040), the fractional transition rate is determined to be B(psi(4040) -> eta J/psi) = (5.2 +/- 0.5 +/- 0.2 +/- 0.5) x 10(-3), where the first, second, and third errors are statistical, systematic, and the uncertainty from the psi(4040) resonant parameters, respectively. The production of e(+)e(-) -> pi(0)J/psi is searched for, but no significant signal is observed, and B(psi(4040) -> pi(0)J/psi) < 2.8 x 10(-4) is obtained at the 90% confidence level.

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Astronomy & astrophysics, Physics

Citation

Ablikim, M. vd. (2012). "Observation of e(+)e(-) -> eta J/psi at center-of-mass energy root s=4.009 GeV". Physical Review D, 86(7).

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