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Observation of the ...
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Ablikim, M.Inst High Energy Phys, Beijing 100049, Peoples R China
(author)
Observation of the hindered electromagnetic Dalitz decay psi(3686) -> e(+) e(-)eta(c)
- Article/chapterEnglish2022
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American Physical Society,2022
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LIBRIS-ID:oai:DiVA.org:uu-498947
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-498947URI
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https://doi.org/10.1103/PhysRevD.106.112002DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.106.112002
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Using a data sample of (448.1 +/- 2.9) x 10(6) psi(3686) decays collected at an e(+)e(& minus;) center-of-mass energy of 3.686 GeV by the BESIII detector at Beijing Electron Positron Collider II, we report an observation of the hindered electromagnetic Dalitz decay psi(3686) -> e(+)e(& minus;)eta(c) with a significance of 7.9 sigma. The branching fraction is determined to be B(psi(3686) -> e(+)e(& minus;)eta(c)) = (3.77 +/- 0.40(stat) +/- 0.18(syst)) x 10(& minus;5), agreeing well with the prediction of the vector meson dominance model. This is the first measurement of the electromagnetic Dalitz transition between the psi(3686) and the eta(c), which provides new insight into the electromagnetic properties of this decay, and offers new opportunities to measure the absolute branching fractions of eta(c) decays.
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Adlarson, PatrikUppsala universitet,Kärnfysik(Swepub:uu)patad399
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Johansson, TordUppsala universitet,Kärnfysik(Swepub:uu)tordjoha
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Kupsc, AndrzejUppsala universitet,Kärnfysik,Natl Ctr Nucl Res, PL-02093 Warsaw, Poland(Swepub:uu)andrkups
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Schönning, Karin,1978-Uppsala universitet,Kärnfysik(Swepub:uu)kasch734
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Thorén, ViktorUppsala universitet,Kärnfysik(Swepub:uu)vikth925
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Wolke, MagnusUppsala universitet,Kärnfysik(Swepub:uu)mawol031
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Zou, J. H.Inst High Energy Phys, Beijing 100049, Peoples R China
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Inst High Energy Phys, Beijing 100049, Peoples R ChinaKärnfysik
(creator_code:org_t)
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In:Physical Review D: American Physical Society106:112470-00102470-0029
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