Measurement of higher-order multipole amplitudes in ψ (3686) →γχc1,2 with χc1,2 →γJ /ψ and search for the transition ηc (2S) →γJ /ψ /M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

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Другой Автор
Ablikim, M.
Ai, X. C.
Chelkov, G. A.
Achasov, M. N.
Источник
Physical Review D 2017 Vol. 95, № 7. P. 072004-1-072004-13
Аннотация
Using 106 ×106 ψð3686Þ events collected with the BESIII detector, we measure multipole amplitudes for the decay ψð3686Þ → γχc1;2 → γγJ=ψ beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for ψð3686Þ → γχc1;2 → γγJ=ψ and the normalized electricoctupole amplitudes for ψð3686Þ → γχc2, χc2 → γJ=ψ are determined. The M2 amplitudes for ψð3686Þ → γχc1 and χc1;2 → γJ=ψ are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of ψð3686Þ and J=ψ decays to χc1;2, b1 2=b2 2 ¼ 1.35 0.72 and a1 2=a2 2 ¼ 0.617 0.083, which agree well with theoretical expectations. By considering the multipole contributions of χc1;2, we measure the product branching fractions for the cascade decays ψð3686Þ → γχc0;1;2 → γγJ=ψ and search for the process ηcð2SÞ → γJ=ψ through ψð3686Þ → γηcð2SÞ. The product branching fraction for ψð3686Þ → γχc0 → γγJ=ψ is 3σ larger than published measurements, while those of ψð3686Þ → γχc1;2 → γγJ=ψ are consistent. No significant signal for the decay ψð3686Þ → γηcð2SÞ → γγJ=ψ is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.
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$a Measurement of higher-order multipole amplitudes in ψ (3686) →γχc1,2 with χc1,2 →γJ /ψ and search for the transition ηc (2S) →γJ /ψ $c M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]
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$a Using 106 ×106 ψð3686Þ events collected with the BESIII detector, we measure multipole amplitudes for the decay ψð3686Þ → γχc1;2 → γγJ=ψ beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for ψð3686Þ → γχc1;2 → γγJ=ψ and the normalized electricoctupole amplitudes for ψð3686Þ → γχc2, χc2 → γJ=ψ are determined. The M2 amplitudes for ψð3686Þ → γχc1 and χc1;2 → γJ=ψ are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of ψð3686Þ and J=ψ decays to χc1;2, b1 2=b2 2 ¼ 1.35  0.72 and a1 2=a2 2 ¼ 0.617  0.083, which agree well with theoretical expectations. By considering the multipole contributions of χc1;2, we measure the product branching fractions for the cascade decays ψð3686Þ → γχc0;1;2 → γγJ=ψ and search for the process ηcð2SÞ → γJ=ψ through ψð3686Þ → γηcð2SÞ. The product branching fraction for ψð3686Þ → γχc0 → γγJ=ψ is 3σ larger than published measurements, while those of ψð3686Þ → γχc1;2 → γγJ=ψ are consistent. No significant signal for the decay ψð3686Þ → γηcð2SÞ → γγJ=ψ is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.
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Предмет
статьи в журналах
Резюме
Using 106 ×106 ψð3686Þ events collected with the BESIII detector, we measure multipole amplitudes for the decay ψð3686Þ → γχc1;2 → γγJ=ψ beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for ψð3686Þ → γχc1;2 → γγJ=ψ and the normalized electricoctupole amplitudes for ψð3686Þ → γχc2, χc2 → γJ=ψ are determined. The M2 amplitudes for ψð3686Þ → γχc1 and χc1;2 → γJ=ψ are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of ψð3686Þ and J=ψ decays to χc1;2, b1 2=b2 2 ¼ 1.35 0.72 and a1 2=a2 2 ¼ 0.617 0.083, which agree well with theoretical expectations. By considering the multipole contributions of χc1;2, we measure the product branching fractions for the cascade decays ψð3686Þ → γχc0;1;2 → γγJ=ψ and search for the process ηcð2SÞ → γJ=ψ through ψð3686Þ → γηcð2SÞ. The product branching fraction for ψð3686Þ → γχc0 → γγJ=ψ is 3σ larger than published measurements, while those of ψð3686Þ → γχc1;2 → γγJ=ψ are consistent. No significant signal for the decay ψð3686Þ → γηcð2SÞ → γγJ=ψ is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.