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Observation of a Charged (D(D)over-bar*)(+/-) Mass Peak in e(+)e(-) -> pi D(D)over-bar* at root s=4.26 GeV
BESIII Callaboration
2014
发表期刊PHYSICAL REVIEW LETTERS
卷号112期号:2
通讯作者Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100049, Peoples R China.
摘要We report on a study of the process e(+)e(-) -> pi(+/-) (D (D) over bar*)(-/+) at root s = 4.26 GeV using a 525 pb(-1) data sample collected with the BESIII detector at the BEPCII storage ring. A distinct charged structure is observed in the (D (D) over bar*)(-/+) invariant mass distribution. When fitted to a mass- dependent- width Breit- Wigner line shape, the pole mass and width are determined to be M-pole (3883: 9 +/- 1.5 (stat) +/- 4.2 dsyst__ MeV= c(2) and Gamma(pole) = (24: 8 +/- 3.3 (stat) +/- 11: 0 (syst)) MeV. The mass and width of the structure, which we refer to as Z(c)(3885), are 2 sigma and 1 sigma, respectively, below those of the Z(c)(3900) -> pi(+/-) J/psi peak observed by BESIII and Belle in pi(+)pi(-) J/psi final states produced at the same center- of- mass energy. The angular distribution of the pi Z(c)(3885) system favors a J(P) = J(P) = 1(+) quantum number assignment for the structure and disfavors 1(-) or 0(-). The Born cross section times the (D (D) over bar*) branching fraction of the Z(c)(3885) is measured to be sigma(e(+)e(-) -> pi(+/-)Z(c)(3885)(-/+)) x B(Z(c)(3885)-/+ -> (D (D) over bar*)(-/+) = (83.5 +/- 6.6 (stat) +/- 22.0 (syst)) pb. Assuming the Z(c)(3885) -> (D (D) over bar*)(-/+) signal reported here and the Z(c)(3900) -> pi J/psi signal are from the same source, the partial width ratio (Gamma(Z(c)(3885) -> D (D) over bar*)/Gamma(Z(c)(3900) -> pi J/psi)) = 6.2 +/- 1.1 (stat) +/- 2.7 (syst) is determined.
关键词ANNIHILATION CHARMONIUM STATE
学科领域Physics
DOI10.1103/PhysRevLett.112.022001
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000331941300008
引用统计
被引频次:145[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213661
专题实验物理中心
作者单位中国科学院高能物理研究所
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BESIII Callaboration. Observation of a Charged (D(D)over-bar*)(+/-) Mass Peak in e(+)e(-) -> pi D(D)over-bar* at root s=4.26 GeV[J]. PHYSICAL REVIEW LETTERS,2014,112(2).
APA BESIII Callaboration.(2014).Observation of a Charged (D(D)over-bar*)(+/-) Mass Peak in e(+)e(-) -> pi D(D)over-bar* at root s=4.26 GeV.PHYSICAL REVIEW LETTERS,112(2).
MLA BESIII Callaboration."Observation of a Charged (D(D)over-bar*)(+/-) Mass Peak in e(+)e(-) -> pi D(D)over-bar* at root s=4.26 GeV".PHYSICAL REVIEW LETTERS 112.2(2014).
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