Improved measurements of two-photon widths of the chi(cj) states and helicity analysis for chi(c2) -> gamma gamma
文献类型：期刊论文
| 作者 | Ablikim, M.1; Achasov, M. N.9,70; Ahmed, S.14; Albrecht, M.4; Amoroso, A.43,44,60,62; An, F. F.1; An, Q.43,44,57; Bai, J. Z.1; Bai, Y.42; Bakina, O.27 |
| 刊名 | Physical review d
 |
| 出版日期 | 2017-11-28 |
| 卷号 | 96期号:9页码:11 |
| ISSN号 | 2470-0010 |
| DOI | 10.1103/physrevd.96.092007 |
| 通讯作者 | Fan, j. z.(fanjz@ihep.ac.cn) |
| 英文摘要 | Based on 448.1 x 10(6) psi(3686) events collected with the besiii detector, the decays psi(3686) -> gamma chi(cj), chi(cj) -> gamma gamma(j = 0, 1, 2) are studied. the decay branching fractions of chi(c0,2) -> gamma gamma are measured to be b(chi(c0) -> gamma gamma) = (1.93 +/- 0.08 +/- 0.05 +/- 0.05) x 10(-4) and b(chi(c2) -> gamma gamma) = (3.10 +/- 0.09 +/- 0.07 +/- 0.11) x 10(-4) which correspond to two-photon decay widths of gamma(gamma gamma)(chi(c0)) = 2.03 +/- 0.08 +/- 0.06 +/- 0.13 kev and gamma(gamma gamma)(chi(c2)) = 0.60 +/- 0.02 +/- 0.01 +/- 0.04 kev with a ratio of r = gamma(gamma gamma)(chi(c2))/gamma(gamma gamma)(chi(c0)) = 0.295 +/- 0.014 +/- 0.007 +/- 0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of b(psi(3686) -> gamma chi(c0,2)) and the total widths gamma(chi(c0,2)), respectively. for the forbidden decay of chi(c1) -> gamma gamma, no signal is observed, and an upper limit on the two-photon width is obtained to be gamma(gamma gamma)(chi(c1)) < 5.3 ev at the 90% confidence level. the ratio of the two-photon widths between helicity-zero and helicity-two components in the decay chi(c2) -> gamma gamma is also measured to be f(0/2) = gamma(lambda=0)(gamma gamma) (chi(c2))/gamma(lambda=2)(gamma gamma) (chi(c2)) = (0.0 +/- 0.6 +/- 1.2) x 10(-2), where the uncertainties are statistical and systematic, respectively. |
| WOS关键词 | QUARKONIA ; ANNIHILATION ; CHROMODYNAMICS ; E(+)E(-) ; BESIII ; RATES |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| WOS类目 | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 语种 | 英语 |
| WOS记录号 | WOS:000416315000002 |
| 出版者 | AMER PHYSICAL SOC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2178289 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Fan, J. Z. |
| 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, Hubei, 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.SB RAS, GI Budker Inst Nucl Phys BINP, Novosibirsk 630090, Russia 10.GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany |
| 推荐引用方式 GB/T 7714 | Ablikim, M.,Achasov, M. N.,Ahmed, S.,et al. Improved measurements of two-photon widths of the chi(cj) states and helicity analysis for chi(c2) -> gamma gamma[J]. Physical review d,2017,96(9):11. |
| APA | Ablikim, M..,Achasov, M. N..,Ahmed, S..,Albrecht, M..,Amoroso, A..,...&Zou, J. H..(2017).Improved measurements of two-photon widths of the chi(cj) states and helicity analysis for chi(c2) -> gamma gamma.Physical review d,96(9),11. |
| MLA | Ablikim, M.,et al."Improved measurements of two-photon widths of the chi(cj) states and helicity analysis for chi(c2) -> gamma gamma".Physical review d 96.9(2017):11. |
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