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Study of e+e- → ωχcJ at center of mass energies from 4.21 to 4.42 GeV M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

Contributor(s): Ablikim, M | Ai, X. C | Chelkov, G. A | Achasov, M. N | Томский государственный университет Радиофизический факультет Научные подразделения РФФMaterial type: ArticleArticleSubject(s): BESIII, детектор | BEPCII, коллайдер | электроныGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review Letters Vol. 114, № 9. P. 092003-1-092003-7Abstract: Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e+e−→ωχcJ (J=0, 1, 2). The process e+e−→ωχc0 is observed for the first time, and the Born cross sections at s√=4.23 and 4.26 GeV are measured to be (55.4±6.0±5.9) and (23.7±5.3±3.5)  pb, respectively, where the first uncertainties are statistical and the second are systematic. The ωχc0 signals at the other seven energies and the e+e−→ωχc1 and ωχc2 signals are not significant, and the upper limits on the cross sections are determined. By examining the ωχc0 cross section as a function of center of mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e+e−→π+π−J/ψ. Assuming the ωχc0 signals come from a single resonance, we extract the mass and width of the resonance to be (4230±8±6)  MeV/c2 and (38±12±2)  MeV, respectively, and the statistical significance is more than 9σ.
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Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e+e−→ωχcJ (J=0, 1, 2). The process e+e−→ωχc0 is observed for the first time, and the Born cross sections at s√=4.23 and 4.26 GeV are measured to be (55.4±6.0±5.9) and (23.7±5.3±3.5)  pb, respectively, where the first uncertainties are statistical and the second are systematic. The ωχc0 signals at the other seven energies and the e+e−→ωχc1 and ωχc2 signals are not significant, and the upper limits on the cross sections are determined. By examining the ωχc0 cross section as a function of center of mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e+e−→π+π−J/ψ. Assuming the ωχc0 signals come from a single resonance, we extract the mass and width of the resonance to be (4230±8±6)  MeV/c2 and (38±12±2)  MeV, respectively, and the statistical significance is more than 9σ.

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