4.7 Article

Study of the decay Ds+ → π+ π+ π-η and observation of the W-annihilation decay Ds+ → a0(980)+ρ0

期刊

PHYSICAL REVIEW D
卷 104, 期 7, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.L071101

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资金

  1. National Key Research and Development Program of China [2020YFA0406400, 2020YFA0406300]
  2. National Natural Science Foundation of China (NSFC) [11625523, 11635010, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11961141012]
  3. Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
  4. NSFC [U1732263, U1832107, U1832207]
  5. CAS [U1732263, U1832107, U1832207]
  6. CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH040]
  7. 100 Talents Program of CAS
  8. INPAC
  9. Shanghai Key Laboratory for Particle Physics and Cosmology
  10. ERC [758462]
  11. European Union Horizon 2020 research and innovation programme [894790]
  12. German Research Foundation DFG under Collaborative Research Center CRC 1044 [443159800]
  13. Istituto Nazionale di Fisica Nucleare, Italy
  14. Ministry of Development of Turkey [DPT2006K-120470]
  15. National Science and Technology fund
  16. Olle Engkvist Foundation [200-0605]
  17. STFC (United Kingdom)
  18. Knut and Alice Wallenberg Foundation (Sweden) [2016.0157]
  19. Royal Society, UK [DH140054, DH160214]
  20. Swedish Research Council
  21. U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-0012069]
  22. German Research Foundation DFG under FOR 2359 [443159800]
  23. German Research Foundation DFG under GRK 214 [443159800]

向作者/读者索取更多资源

The first observation of the decay mode D-s(+) ->pi(+) pi(+) pi(-) eta was made, with an amplitude analysis conducted to reveal the substructures and branching fractions within this decay. The dominant intermediate process and W-annihilation process were identified, with the latter showing a significantly higher branching fraction compared to other similar decays.
The decay D-s(+) -> pi(+) pi(+) pi(-)eta is observed for the first time, using e(+)e(-) collision data corresponding to an integrated luminosity of 6.32 fb(-1), 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(D-s(+) -> pi(+) pi(+) pi(-)eta) = (3.12 +/- 0.13(stat) +/- 0.09(syst))% The first amplitude analysis of this decay reveals the substructures in D-s(+) -> pi(+) pi(+) pi(-)eta and determines the relative fractions and the phases among these substructures. The dominant intermediate process is D-s(+) -> a(1)(1260)(+)eta, a(1)(1260)(+) -> rho(770)(0)pi(+) with a branching fraction of (1.73 +/- 0.14(stat) +/- 0.08(syst))%. We also observe the W-annihilation process D-s(+) -> a(0)(980)(+) rho(770)(0), a(0)(980)(+) -> pi(+)eta. with a branching fraction of (0.21 +/- 0.08(stat) +/- 0.05(syst))%, which is larger than the branching fractions of other measured pure W-annihilation decays by 1 order of magnitude.

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