Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-)
文献类型：期刊论文
| 作者 | Ping, R. G.; Ablikim, M.; Achasov, M. N.; Ahmed, S.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F. |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2016 |
| 卷号 | 117期号:4页码:42002 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.117.042002 |
| 文献子类 | Article |
| 英文摘要 | Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. |
| 电子版国际标准刊号 | 1079-7114 |
| 语种 | 英语 |
| WOS记录号 | WOS:000380123400003 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/287040]  |
| 专题 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Ping, R. G.,Ablikim, M.,Achasov, M. N.,et al. Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-)[J]. PHYSICAL REVIEW LETTERS,2016,117(4):42002. |
| APA | Ping, R. G..,Ablikim, M..,Achasov, M. N..,Ahmed, S..,Ai, X. C..,...&Zou, J. H..(2016).Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-).PHYSICAL REVIEW LETTERS,117(4),42002. |
| MLA | Ping, R. G.,et al."Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-)".PHYSICAL REVIEW LETTERS 117.4(2016):42002. |
入库方式： OAI收割
来源：高能物理研究所
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