Study of the reaction e[superscript +]e[superscript -]→J/ψπ[superscript +]π[superscript -] via initial-state radiation at BABAR
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Lees-2012-Study of the reaction.pdf
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Author(s)
Dujmic, Denis
Sciolla, Gabriella
Cowan, Ray F
Date Issued
September 2012
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. et al. “Study of the reaction e[superscript +]e[superscript -]→J/ψπ[superscript +]π[superscript -] via initial-state radiation at BABAR.” Physical Review D 86.5 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We study the process e[superscript +]e[superscript -]→J/ψπ[superscript +]π[superscript -] 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 454 fb[superscript -1]. We investigate the J/ψπ[superscript +]π[superscript -] mass distribution in the region from 3.5 to 5.5 GeV/c[superscript 2]. Below 3.7 GeV/c[superscript 2] the ψ(2S) signal dominates, and above 4 GeV/c[superscript 2] there is a significant peak due to the Y(4260). A fit to the data in the range 3.74–5.50 GeV/c[superscript 2] yields a mass value 4245±5(stat)±4(syst) MeV/c[superscript 2] and a width value 114[subscript -15][superscript +16](stat)±7(syst) MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01 GeV/c[superscript 2]. In addition, we investigate the π[superscript +]π[superscript -] system which results from Y(4260) decay.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.86.051102
