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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Ablikim, M.1; Achasov, M. N.67; Ahmed, S.14; Ai, X. C.1; Albayrak, O.5; Albrecht, M.4; Ambrose, D. J.50; Amoroso, A.55,57; An, F. F.1; An, Q.52,62,63
刊名Physical review letters
出版日期2016-07-21
卷号117期号:4页码:7
ISSN号0031-9007
DOI10.1103/physrevlett.117.042002
通讯作者Ablikim, m.()
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.
WOS关键词BARYONIUM ; GLUEBALL ; X(1835) ; STATE ; QCD
WOS研究方向Physics
WOS类目Physics, Multidisciplinary
语种英语
出版者AMER PHYSICAL SOC
WOS记录号WOS:000380123400003
URI标识http://www.irgrid.ac.cn/handle/1471x/2374536
专题中国科学院大学
通讯作者Ablikim, M.
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, D-102617 Beijing, Germany
4.Ruhr Univ Bochum, D-44780 Bochum, Germany
5.Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
6.Cent China Normal Univ, Wuhan 100190, 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.GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia
10.GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany
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GB/T 7714
Ablikim, M.,Achasov, M. N.,Ahmed, S.,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):7.
APA Ablikim, M..,Achasov, M. N..,Ahmed, S..,Ai, X. C..,Albayrak, O..,...&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),7.
MLA Ablikim, M.,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):7.

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