Study of the decay Ds+ -> pi+ pi+ pi- eta and observation of the W-annihilation decay Ds+ -> a0(980)+ rho0
Study of the decay Ds+ -> pi+ pi+ pi- eta and observation of the W-annihilation decay Ds+ -> a0(980)+ rho0
复制标题
衰变 Ds - Ï Ï Ï - η 的研究和 W 湮没衰变的观测 Ds - a0(980) Ï0
DOI：
10.1103/physrevd.104.l071101
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发表时间：
2021
影响因子：
5
通讯作者：
R. A. Br
中科院分区：
文献类型：
--
作者：
M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;R. Aliberti;A. Amoroso;M. R. An;Q. An;X. H. Bai;Y. Bai;O. Bakina;R. Baldini Ferroli;I. Balossino;Y. Ban;K. Begzsuren;N. Berger;M. Bertani;D. Bettoni;F. Bianchi;J. Bloms;A. Bortone;I. Boyko;R. A. Br
这次衰变是首次观测到的，使用的是北京谱仪III探测器在4.178到4.226 GeV之间的质心能量下收集的与积分光度相对应的碰撞数据。测得该衰变的绝对分支率为B(DS+→π+π+π-η)=(3.12±0.13stat±0.09syst)%。这种衰变的第一次幅度分析揭示了其中的子结构，并确定了这些子结构中的相对分数和相。主要的中间过程是DS+→A1(12 6 0)+η，A1(12 6 0)+→ρ(770)0π+，支化分数为我们还观察到了-湮没过程，其分支分数为，比其他测量的纯湮没衰变的分支分数大一个数量级。
The decayis observed for the first time, usingcollision data corresponding to an integrated luminosity of, collected by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be B(Ds+→π+π+π-η)=(3.12±0.13stat±0.09syst)%. The first amplitude analysis of this decay reveals the substructures inand determines the relative fractions and the phases among these substructures. The dominant intermediate process is Ds+→a1(1260)+η,a1(1260)+→ρ(770)0π+ with a branching fraction of. We also observe the-annihilation process,with a branching fraction of, which is larger than the branching fractions of other measured pure-annihilation decays by 1 order of magnitude.