Measurement of the $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ Cross Section Via Initial-State Radiation at Belle

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2 November 2007

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 99 (18) , 182004
https://doi.org/10.1103/physrevlett.99.182004

Abstract

The cross section for

e^{+} e^{-} \to π^{+} π^{-} J / ψ

between 3.8 and

5.5 GeV / c^{2}

is measured using a

548 {fb}^{- 1}

data sample collected on or near the

Υ (4 S)

resonance with the Belle detector at KEKB. A peak near

4.25 GeV / c^{2}

, corresponding to the so called

Y (4260)

, is observed. In addition, there is another cluster of events at around

4.05 GeV / c^{2}

. A fit using two interfering Breit-Wigner shapes describes the data better than one that uses only the

Y (4260)

, especially for the lower-mass side of the 4.25 GeV enhancement.

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This publication has 14 references indexed in Scilit:

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