Publication: Observation of e(+)e(-) -> eta J/psi at center-of-mass energy root s=4.009 GeV
Date
Authors
Tapan, İlhan
Authors
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.
Advisor
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American Physical Society
Journal Title
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Volume Title
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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Keywords
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).