Measurement of e + e − → γ χ c 0 , c 1 , c 2 cross sections at center-of-mass energies between 3.77 and 4.60 GeV

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, D. Y.; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chen, Z. J.; Cheng, W. S.; Cibinetto, G.; Cossio, F.; Cui, X. F.; Dai, H. L.; Dai, X. C.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, S. X.; Fan, Y. L.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Feng, J. H.; Fritsch, M.; Fu, C. D.; Gao, Y.; Gao, Y.; Gao, Y.; Gao, Y. G.; Garzia, I.; Ge, P. 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doi:10.1103/PhysRevD.104.092001

Title: Measurement of $e^{+} e^{-} \to γ χ_{c 0, c 1, c 2}$ cross sections at center-of-mass energies between 3.77 and 4.60 GeV

Journal Article · Mon Nov 01 00:00:00 EDT 2021 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.104.092001· OSTI ID:1828468

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

The e⁺e^-→γχ_cJ (J = 0, 1, 2) processes are studied at center-of-mass energies ranging from 3.773 to 4.600 GeV, using a total integrated luminosity of 19.3 fb^-1 e⁺e^- annihilation data accumulated with the BESIII detector at BEPCII. We observe for the first time e⁺e^-→γχ_c1,_c2 signals at $$\sqrt{s}$$ = 4.180 GeV with statistical significances of 7.6σ and 6.0σ, respectively. The production cross section of e⁺e^-→γχ_c1,_c2 at each center-of-mass energy is also measured. We find that the line shape of the e⁺e^- →γχ_c1 cross section can be described with conventional charmonium states ψ(3686), ψ(3770), ψ(4040), ψ(4160). Compared with this, for the e⁺e^- →γχ_c2 channel, one more additional resonance is added to describe the cross section line shape. Its mass and width are measured to be M=4371.7±7.5±1.8 MeV/c2 and Γ^tot = 51.1±17.6±1.9 MeV, where the first uncertainties are statistical and the second systematic. The significance of this resonance is estimated to be 5.8σ, and its parameters agree with the Y(4360) resonance previously reported in e⁺e^- →π⁺π^-ψ(3686), and the Y(4390) in e⁺e^- →π⁺π^-hc within uncertainties. No significant signal for the e⁺e^- →γχ_c0 process is observed, and the upper limits of Born cross sections σ B(e⁺e^- →γχ_c0) at 90% confidence level are reported.

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Research Organization:: Indiana Univ., Bloomington, IN (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC-0012069; QYZDJ-SSW-SLH040; CRC 1044; FOR 2359; GRK 214; 200-0605; SC0012069

OSTI ID:: 1828468

Alternate ID(s):: OSTI ID: 1979930

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 104 Journal Issue: 9; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Measurement of e + e − → γ χ c 0 , c 1 , c 2 cross sections at center-of-mass energies between 3.77 and 4.60 GeV

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Title: Measurement of $e^{+} e^{-} \to γ χ_{c 0, c 1, c 2}$ cross sections at center-of-mass energies between 3.77 and 4.60 GeV