摘要
我们对e^(+)e^(-)→ωπ^(0)π^(0)、e^(+)e^(-)→ωπ^(+)π^(-)和e^(+)e^(-)→ωη进行了联合分析来研究2.2 GeV附近可能的激发态。我们通过对这些过程的玻恩截面形状谱的联合拟合来得到共振态参数。在加入一个共振态的拟合中,质量和宽度分别为(2207±14)MeV/c^(2)和(104±16)MeV。结果和之前的测量结果一致。在加入两个共振态的拟合中,第一个共振态的质量和宽度分别为(2160±36)MeV/c^(2)(解1)、(2154±12)MeV/(解2)和(141±74)MeV(解1)、(152±77)MeV(解2)。第二个共振态的质量和宽度分别为(2298±19)MeV/c^(2)(解1)、(2309±6)MeV/(解2)和(106±77)MeV(解1)、(99±23)MeV(解2)。结果与ω(4S)和ω(3D)参数的理论预言一致。基于这些拟合结果,我们还研究了e^(+)e^(-)→ωπ^(+)π^(-)的中间态两体过程。在加入一个共振态的拟合中,■的结果与之前的结果部分符合。在加入两个共振态的拟合中,■的结果与理论预言在同一数量级。本文的工作可以为研究轻味矢量介子家族提供有效信息。
In this work,a combined analysis is performed on the processes of■and■to study possible excited states at approximately 2.2 GeV.The resonance parameters are extracted by simultaneous fits of the Born cross section line shapes of these processes.In the fit with one resonance,the mass and width are fitted to be(2207±14)Mev/c^(2)(solution II)and(141±74)Mev(solution I),(152±77)Mev(solution II),respectively.The mass and width for the second resonance are fitted to be(2298±19)Mev/c^(2)(solution I),(2309±6)Mev/c^(2)(solution II)and(106±77)Mev(solution I),(99±23)MeV(solution II),respectively.The result is consistent with the theoretical prediction ofω(4S)andω(3D).The intermediate subprocesses in■are analyzed using the resonance parameters of the previous fits in this work.In the fit with one resonance,the fitting result of■is partially consistent with the previous result.In the fit with two resonances,the fitting result of■BR is of the same order of magnitude as the theoretical prediction.This work may provide useful information for studying the light flavor vector meson family.
作者
吴言
周钦松
鄢文标
黄光顺
Yan Wu;Qinsong Zhou;Wenbiao Yan;Guangshun Huang(Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China;School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China;Research Center for Hadron and CSR Physics,Lanzhou University&Institute of Modern Physics of CAS,Lanzhou 730000,China)
出处
《中国科学技术大学学报》
CAS
CSCD
北大核心
2023年第7期24-33,69,70,共12页
JUSTC
基金
supported by the National Natural Science Foundation of China(12035013)
Joint Large-Scale Scientific Facility Funds(U1732263)
National Key R D Program of China(2020YFA0406403).
关键词
ω激发态
同时拟合
轻味矢量介子
ωexcited states
simultaneous fit
light flavor vector meson
