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Study of the reaction e^{+}e^{-}→J/ψπ^{+}π^{-} via initial-state radiation at BABAR

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Lees, J., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D., Kerth, L. et al.
. (2012) Study of the reaction e^{+}e^{-}→J/ψπ^{+}π^{-} via initial-state radiation at BABAR. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.86 (No.5). Article no.051102 . ISSN 1550-7998

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Abstract

We study the process e +e -→J/ψπ +π - with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the BABAR detector at center-of-mass energies 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454fb -1. We investigate the J/ψπ +π - mass distribution in the region from 3.5 to 5.5GeV/c2. Below 3.7GeV/c2 the ψ(2S) signal dominates, and above 4GeV/c2 there is a significant peak due to the Y(4260). A fit to the data in the range 3.74-5.50GeV/c2 yields a mass value 4245±5(stat)±4(syst)MeV/c2 and a width value 114-15+16(stat) ±7(syst)MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01GeV/c2. In addition, we investigate the π +π - system which results from Y(4260) decay. © 2012 American Physical Society.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Date: 2012
Volume: Vol.86
Number: No.5
Page Range: Article no.051102
Identification Number: 10.1103/PhysRevD.86.051102
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
URI: http://wrap.warwick.ac.uk/id/eprint/50198

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