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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

文献类型:期刊论文

作者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
出版日期2017-04-06
卷号95期号:7页码:13
ISSN号2470-0010
DOI10.1103/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
URI标识http://www.irgrid.ac.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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