Observation of a Resonant Structure in e+e-→K+K-π0π0

BESIII Collaboration

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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- A nd 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).

Original languageEnglish
Article number112001
Number of pages8
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 20 Mar 2020
Externally publishedYes

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