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Measurement of the ...
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Ablikim, M.Inst High Energy Phys, Beijing 100049, Peoples R China
(author)
Measurement of the branching fraction of and search for a CP-violating asymmetry in η′ → π+π−e+e− at BESIII
- Article/chapterEnglish2021
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American Physical Society,2021
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LIBRIS-ID:oai:DiVA.org:uu-446895
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446895URI
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https://doi.org/10.1103/PhysRevD.103.092005DOI
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Language:English
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Summary in:English
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For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.103.092005
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The rare decay η′ → π+π−e+e− is studied using a sample of 1.3×109 J/ψ events collected with the BESIII detector at BEPCII in 2009 and 2012. The branching fraction is measured with improved precision to be (2.42±0.05stat±0.08syst)×10−3. Due to the inclusion of new data, this result supersedes the last BESIII result on this branching fraction. In addition, the CP-violating asymmetry in the angle between the decay planes of the π+π−-pair and the e+e−-pair is investigated. A measurable value would indicate physics beyond the standard model; the result is ACP=(2.9±3.7stat±1.1syst)%, which is consistent with the standard model expectation of no CP-violation. The precision is comparable to the asymmetry measurement in the K0L → π+π−e+e− decay where the observed (14±2)% effect is driven by a standard model mechanism.
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Adlarson, PatrikUppsala universitet,Kärnfysik(Swepub:uu)patad399
(author)
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Biernat, JacekUppsala universitet,Kärnfysik(Swepub:uu)jacbi188
(author)
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Ikegami Andersson, WalterUppsala universitet,Kärnfysik(Swepub:uu)walan603
(author)
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Johansson, TordUppsala universitet,Kärnfysik(Swepub:uu)tordjoha
(author)
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Kupsc, AndrzejUppsala universitet,Kärnfysik(Swepub:uu)andrkups
(author)
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Pettersson, JoachimUppsala universitet,Kärnfysik(Swepub:uu)joape785
(author)
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Schönning, Karin,1978-Uppsala universitet,Kärnfysik(Swepub:uu)kasch734
(author)
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Thorén, ViktorUppsala universitet,Kärnfysik(Swepub:uu)vikth925
(author)
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Wolke, MagnusUppsala universitet,Kärnfysik(Swepub:uu)mawol031
(author)
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Zou, J. H.Inst High Energy Phys, Beijing 100049, Peoples R China
(author)
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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 Society103:92470-00102470-0029
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Kupsc, Andrzej
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