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Measurement of the ...
Measurement of the branching fraction of and search for a CP-violating asymmetry in η′ → π+π−e+e− at BESIII
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- Ablikim, M. (author)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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- Adlarson, Patrik (author)
- Uppsala universitet,Kärnfysik
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- Biernat, Jacek (author)
- Uppsala universitet,Kärnfysik
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- Ikegami Andersson, Walter (author)
- Uppsala universitet,Kärnfysik
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- Johansson, Tord (author)
- Uppsala universitet,Kärnfysik
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- Kupsc, Andrzej (author)
- Uppsala universitet,Kärnfysik
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- Pettersson, Joachim (author)
- Uppsala universitet,Kärnfysik
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- Schönning, Karin, 1978- (author)
- Uppsala universitet,Kärnfysik
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- Thorén, Viktor (author)
- Uppsala universitet,Kärnfysik
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- Wolke, Magnus (author)
- Uppsala universitet,Kärnfysik
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- Zou, J. H. (author)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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(creator_code:org_t)
- American Physical Society, 2021
- 2021
- English.
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In: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 103:9
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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Abstract
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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.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Ablikim, M.
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Adlarson, Patrik
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Biernat, Jacek
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Ikegami Andersso ...
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Johansson, Tord
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Kupsc, Andrzej
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show more...
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Pettersson, Joac ...
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Schönning, Karin ...
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Thorén, Viktor
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Wolke, Magnus
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Zou, J. H.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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Physical Review ...
- By the university
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Uppsala University