Study of J/ψ → ηϕπ+π− at BESIII /M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

Электронный ресурс
Другой Автор
Ablikim, M.
Ai, X. C.
Chelkov, G. A.
Achasov, M. N.
Источник
Physical Review D 2015 Vol. 91, № 5. P. 052017-1-052017-11
Аннотация
Based on a sample of 2.25×108J/ψ events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/ψ→ηϕπ+π−. The Y(2175) resonance is observed in the invariant mass spectrum of ϕf0(980) with a statistical significance of greater than 10σ. The corresponding mass and width are determined to be M=2200±6(stat)±5(syst)  MeV/c2 and Γ=104±15(stat)±15(syst)  MeV, respectively, and the product branching fraction is measured to be B(J/ψ→ηY(2175),Y(2175)→ϕf0(980),f0(980)→π+π−)=(1.20±0.14(stat)±0.37(syst))×10−4. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of J/ψ→ϕf1(1285) with f1(1285)→ηπ+π− and set upper limits on the branching fractions for J/ψ→ϕη(1405)/ϕX(1835)/ϕX(1870) with η(1405)/X(1835)/X(1870)→ηπ+π− at the 90% confidence level.
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$a Based on a sample of 2.25×108J/ψ events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/ψ→ηϕπ+π−. The Y(2175) resonance is observed in the invariant mass spectrum of ϕf0(980) with a statistical significance of greater than 10σ. The corresponding mass and width are determined to be M=2200±6(stat)±5(syst)  MeV/c2 and Γ=104±15(stat)±15(syst)  MeV, respectively, and the product branching fraction is measured to be B(J/ψ→ηY(2175),Y(2175)→ϕf0(980),f0(980)→π+π−)=(1.20±0.14(stat)±0.37(syst))×10−4. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of J/ψ→ϕf1(1285) with f1(1285)→ηπ+π− and set upper limits on the branching fractions for J/ψ→ϕη(1405)/ϕX(1835)/ϕX(1870) with η(1405)/X(1835)/X(1870)→ηπ+π− at the 90% confidence level.
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$a BESIII, детектор
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$a BEPCII, коллайдер
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$a Achasov, M. N.
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$a Томский государственный университет $b Радиофизический факультет $b Научные подразделения РФФ
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статьи в журналах
Резюме
Based on a sample of 2.25×108J/ψ events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/ψ→ηϕπ+π−. The Y(2175) resonance is observed in the invariant mass spectrum of ϕf0(980) with a statistical significance of greater than 10σ. The corresponding mass and width are determined to be M=2200±6(stat)±5(syst)  MeV/c2 and Γ=104±15(stat)±15(syst)  MeV, respectively, and the product branching fraction is measured to be B(J/ψ→ηY(2175),Y(2175)→ϕf0(980),f0(980)→π+π−)=(1.20±0.14(stat)±0.37(syst))×10−4. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of J/ψ→ϕf1(1285) with f1(1285)→ηπ+π− and set upper limits on the branching fractions for J/ψ→ϕη(1405)/ϕX(1835)/ϕX(1870) with η(1405)/X(1835)/X(1870)→ηπ+π− at the 90% confidence level.