Publication: Measurement of e+e- → π0π0ψ(3686) at √s from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
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Authors
Tapan, İlhan
Authors
Achasov, M. N.
Ahmed, S.
Albrecht, M.
Amoroso, A.
An, F. F.
An, Q.
Bai, J. Z.
Bakina, O.
Ferroli, R. Baldini
Ban, Y.
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Amer Physical Soc
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Abstract
We investigate the process e(+)e(-) -> K (K) over barJ/psi at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb(-1) of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions e(+)e(-) -> K(+)K(-)J/psi and K(S)(0)K(S)(0)J/psi are measured as a function of center-of-mass energy. The energy dependence of the cross section for e(+)e(-) -> K(+)K(-)J/psi is shown to differ from that for pi(+)pi(-)J/psi in the region around the Y(4260). In addition, there is evidence for a structure around 4.5 GeV in the e(+)e(-) -> K(+)K(-)J/psi cross section that is not present in pi(+)pi(-)J/psi.
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Decay, Science & technology, Physical sciences, Astronomy & astrophysics, Physics, particles & fields, Astronomy & astrophysics, Physics