Measurement of higher-order multipole amplitudes in psi(3686) -> gamma chi(c1,2) with chi(c1,2) -> gamma j/psi and search for the transition eta(c)(2s) -> gamma j/psi | |
Ablikim, M.1; Achasov, M. N.9,66; Ai, X. C.1; Albayrak, O.5; Albrecht, M.4; Ambrose, D. J.50; Amoroso, A.55,57; An, F. F.1; An, Q.52,62; Bai, J. Z.1 | |
刊名 | Physical review d
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2017-04-06 | |
卷号 | 95期号:7页码:13 |
ISSN号 | 2470-0010 |
DOI | 10.1103/physrevd.95.072004 |
通讯作者 | Gao, q.(gaoq@ihep.ac.cn) ; Liu, zhiqing(jingzhi@ihep.ac.cn) |
英文摘要 | Using 106 x 10(6) psi(3686) events collected with the besiii detector, we measure multipole amplitudes for the decay psi(3686) ->; gamma chi(c1,2) -> gamma gamma j/psi beyond the dominant electric-dipole amplitudes. the normalized magnetic-quadrupole (m2) amplitude for psi(3686) -> gamma chi(c1,2) -> gamma gamma j/psi and the normalized electric-dipole amplitudes for psi(3686) -> gamma chi(c2) -> gamma j/psi and determined. the m2 amplitudes for psi(3686) -> gamma chi(c1) and ; chi(c1,2) -> gamma j/psi are found to differ significantly from zero and are consistent with theoretical predictions. we also obtain the ratios of m2 contributions of psi(3686) and j/psi decays to;2,chi(c1,2,) b(2)(1/)b(2)(2) = 1.35 +/- 0.72 and a(2)(1/)a(2)(2) = 0.617 +/- 0.083,,which agree well with theoretical expectations. by considering the multipole contributions of chi(c1,2), we measure the product branching fractions for the cascade decays psi(3686) -> gamma chi(c 0,1,2) -> gamma gamma j/psi and search for the process eta(c)(2s) -> gamma j/psi through psi(3686) -> gamma eta(c)(2s).the product branching fraction for psi(3686) -> gamma chi(c0) -> gamma gamma j/psi is 3 sigma larger than published measurements, while those of psi(3686) -> gamma chi(c1,2) -> gamma gamma j/psi are consistent. no significant signal for the decay psi(3686) -> gamma eta(c) (2s) -> gamma gamma j/psi is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined. |
WOS关键词 | CHARMONIUM |
WOS研究方向 | Astronomy & Astrophysics ; Physics |
WOS类目 | Astronomy & Astrophysics ; Physics, Particles & Fields |
语种 | 英语 |
出版者 | AMER PHYSICAL SOC |
WOS记录号 | WOS:000399391000001 |
内容类型 | 期刊论文 |
URI标识 | http://www.corc.org.cn/handle/1471x/2177451 |
专题 | 高能物理研究所 |
通讯作者 | Gao, Q.; Liu, Zhiqing |
作者单位 | 1.Inst High Energy Phys, Beijing 100049, Peoples R China 2.Beihang Univ, Beijing 100191, Peoples R China 3.Beijing Inst Petrochem Technol, Beijing 102617, Peoples R China 4.Bochum Ruhr Univ, D-44780 Bochum, Germany 5.Carnegie Mellon Univ, Pittsburgh, PA 15213 USA 6.Cent China Normal Univ, Wuhan 430079, Peoples R China 7.China Ctr Adv Sci & Technol, Beijing 100190, Peoples R China 8.COMSATS Inst Informat Technol, Def Rd,Off Raiwind Rd, Lahore 54000, Pakistan 9.G I Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia 10.GSI Helmholtzcentre Heavy Ion Res GmbH, D-64291 Darmstadt, Germany |
推荐引用方式 GB/T 7714 | Ablikim, M.,Achasov, M. N.,Ai, X. C.,et al. Measurement of higher-order multipole amplitudes in psi(3686) -> gamma chi(c1,2) with chi(c1,2) -> gamma j/psi and search for the transition eta(c)(2s) -> gamma j/psi[J]. Physical review d,2017,95(7):13. |
APA | Ablikim, M..,Achasov, M. N..,Ai, X. C..,Albayrak, O..,Albrecht, M..,...&Zou, J. H..(2017).Measurement of higher-order multipole amplitudes in psi(3686) -> gamma chi(c1,2) with chi(c1,2) -> gamma j/psi and search for the transition eta(c)(2s) -> gamma j/psi.Physical review d,95(7),13. |
MLA | Ablikim, M.,et al."Measurement of higher-order multipole amplitudes in psi(3686) -> gamma chi(c1,2) with chi(c1,2) -> gamma j/psi and search for the transition eta(c)(2s) -> gamma j/psi".Physical review d 95.7(2017):13. |
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