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Precise Measurement of the e(+)e(-) ->pi(+)pi(-) J/psi Cross Section at Center-of-Mass Energies from 3.77 to 4.60 GeV
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia..
Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany..
Inst High Energy Phys, Beijing 100049, Peoples R China..
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 9, 092001Article in journal (Refereed) Published
Abstract [en]

The cross section for the process e(+)e(-)-> pi(+) pi(-) J/psi is measured precisely at center-of-mass energies from 3.77 to 4.60 GeV using 9 fb(-1) of data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in a fit to the cross section. The first resonance has a mass of (222.0 +/- 3.1 +/- 1.4) MeV/ c(2) and a width of (44.1 +/- 4.3 +/- 2.0)MeV, while the second one has a mass of (4320.0 +/- 10.4 +/- 7.0)MeV/c(2) and a width of (101.4(- 19.7)(+25.3) +/- 10.2) MeV, where the first errors are statistical and second ones are systematic. The first resonance agrees with the Y(4260) resonance reported by previous experiments. The precision of its resonant parameters is improved significantly. The second resonance is observed in e(+)e(-)-> pi(+) pi(-) J/psi for the first time. The statistical significance of this resonance is estimated to be larger than 7.6 sigma. The mass and width of the second resonance agree with the Y(4360) resonance reported by the BABAR and Belle experiments within errors. Finally, the Y(4008) resonance previously observed by the Belle experiment is not confirmed in the description of the BESIII data.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 118, no 9, 092001
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-319539DOI: 10.1103/PhysRevLett.118.092001ISI: 000396043900003OAI: oai:DiVA.org:uu-319539DiVA: diva2:1087366
Funder
EU, FP7, Seventh Framework Programme, 627240
Available from: 2017-04-06 Created: 2017-04-06 Last updated: 2017-04-06Bibliographically approved

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