Evidence for e+e-→γχc1,2 at center-of-mass energies from 4.009 to 4.360 GeV

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M. Ablikim, M. N. Achasov, X. C. Ai and et al. (BESⅢ collaboration). Evidence for e+e-→γχc1,2 at center-of-mass energies from 4.009 to 4.360 GeV[J]. Chinese Physics C, 2015, 39(4): 041001. doi: 10.1088/1674-1137/39/4/041001
M. Ablikim, M. N. Achasov, X. C. Ai and et al. (BESⅢ collaboration). Evidence for e+e-→γχc1,2 at center-of-mass energies from 4.009 to 4.360 GeV[J]. Chinese Physics C, 2015, 39(4): 041001.  doi: 10.1088/1674-1137/39/4/041001 shu
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Received: 2014-10-25
Revised: 1900-01-01
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Evidence for e+e-→γχc1,2 at center-of-mass energies from 4.009 to 4.360 GeV

Abstract: Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 GeV with the BES0 detector operating at the BEPC/ collider, we perform a search for the process e+e-→γχc,j (J =0, 1, 2) and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc,j), as well as their upper limits at the 90% con dence level (C.L.) are determined at each center-of-mass energy.

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