Observation of a Resonant Structure in e+eK+Kπ0π0e^{+}e^{-} \to K^{+}K^{-}\pi^{0}\pi^{0}

Collaboration
Jan 13, 2020
8 pages
Published in:
  • Phys.Rev.Lett. 124 (2020) 11, 112001
  • Published: Mar 19, 2020
e-Print:
Experiments:

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Abstract: (APS)
A partial-wave analysis is performed for the process e+e-→K+K-π0π0 at the center-of-mass energies ranging from 2.000 to 2.644 GeV. The data samples of e+e- collisions, collected by the BESIII detector at the BEPCII collider with a total integrated luminosity of 300  pb-1, are analyzed. The total Born cross sections for the process e+e-→K+K-π0π0, as well as the Born cross sections for the subprocesses e+e-→ϕπ0π0, K+(1460)K-, K1+(1400)K-, K1+(1270)K-, and K*+(892)K*-(892), are measured versus the center-of-mass energy. The corresponding results for e+e-→K+K-π0π0 and ϕπ0π0 are consistent with those of BABAR with better precision. By analyzing the cross sections for the four subprocesses, K+(1460)K-, K1+(1400)K-, K1+(1270)K-, and K*+(892)K*-(892), a structure with mass M=(2126.5±16.8±12.4)  MeV/c2 and width Γ=(106.9±32.1±28.1)  MeV is observed with an overall statistical significance of 6.3σ, although with very limited significance in the subprocesses e+e-→K1+(1270)K- and K*+(892)K*-(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).
  • Elementary Particles and Fields
  • electron positron: annihilation
  • electron positron: colliding beams
  • K: pair production
  • structure
  • partial wave analysis
  • Beijing Stor
  • statistical
  • tree approximation
  • Born approximation