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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

AuthorAblikim, 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
SourcePhysical review letters
Issued Date2016-07-21
Volume117Issue:4Pages:7
ISSN0031-9007
DOI10.1103/physrevlett.117.042002
Corresponding AuthorAblikim, m.()
English AbstractUsing 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 KeywordBARYONIUM ; GLUEBALL ; X(1835) ; STATE ; QCD
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
Language英语
WOS IDWOS:000380123400003
PublisherAMER PHYSICAL SOC
URIhttp://www.irgrid.ac.cn/handle/1471x/2374536
Collection中国科学院大学
Corresponding AuthorAblikim, M.
Affiliation1.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
Recommended Citation
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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