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Measurement of e (+...
Measurement of e (+) e (-) -> gamma chi(c0,c1,c2) cross sections at center-of-mass energies between 3.77 and 4.60 GeV
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- Ablikim, M. (författare)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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- Adlarson, Patrik (författare)
- Uppsala universitet,Kärnfysik
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- Ikegami Andersson, Walter (författare)
- Uppsala universitet,Kärnfysik
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- Johansson, Tim (författare)
- Uppsala universitet,Kärnfysik
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- Kupsc, Andrzej (författare)
- Uppsala universitet,Kärnfysik
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- Pettersson, Jennie (författare)
- Uppsala universitet,Kärnfysik,Uppsala Univ, Box 516, SE-75120 Uppsala, Sweden
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- Schönning, Karin, 1978- (författare)
- Uppsala universitet,Kärnfysik
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- Thorén, Viktor (författare)
- Uppsala universitet,Kärnfysik
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- Wolke, Magnus (författare)
- Uppsala universitet,Kärnfysik
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- Zou, J. H. (författare)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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(creator_code:org_t)
- American Physical Society, 2021
- 2021
- Engelska.
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Ingår i: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 104:9
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- BESIII detector at BEPCII. We observe for the first time e(+)e(-)->gamma chi(c1; c2) signals at root s = 4.180 GeV with statistical significances of 7.6s and 6.0s, respectively. The production cross section of e(+)e(-)->gamma chi(c1; c2) at each center-of-mass energy is also measured. We find that the line shape of the e(+)e(-) ->gamma chi(c1) cross section can be described with conventional charmonium states psi(3686), psi(3770), psi(4040), psi(4160). Compared with this, for the e(+)e(-) ->gamma chi(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=c(2) and G(tot) 1/4 =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 5.8s, and its parameters agree with the Yo4360THORN resonance previously reported in e(+)e(-)-> pi+pi(-)psi(3686), and the Y(4390) in e(+)e(-). pi(+)pi(-) h(c) within uncertainties. No significant signal for the e(+)e(-->)gamma chi(c0) process is observed, and the upper limits of Born cross sections sigma(B)(e(+)e(-)->gamma chi(c0)) at 90% confidence level are reported.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
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