Observation of e + e - → φ χ c 1 and φ χ c 2 at s = 4.600 GeV


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Ablikim M., Achasov M., Ahmed S., Albrecht M., Amoroso A., An F., ...Daha Fazla

Physical Review D, cilt.97, sa.3, 2018 (SCI-Expanded) identifier identifier

Özet

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of s=4.600 GeV, we search for the production of e+e-→φχc0,1,2. A search is also performed for the charmonium-like state X(4140) in the radiative transition e+e-→γX(4140) with X(4140) subsequently decaying into φJ/ψ. The processes e+e-→φχc1 and φχc2 are observed for the first time, each with a statistical significance of more than 10σ, and the Born cross sections are measured to be (4.2-1.0+1.7±0.3) and (6.7-1.7+3.4±0.5) pb, respectively, where the first uncertainties are statistical and the second systematic. No significant signals are observed for e+e-→φχc0 and e+e-→γX(4140) and upper limits on the Born cross sections at 90% C.L. are provided at s=4.600 GeV.