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Measurement of B(J/ψ→η'e+e−) and search for a dark photon
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0002-6945-716x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0003-4937-2270
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Number of Authors: 4522019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 1, article id 012013Article in journal (Refereed) Published
Abstract [en]

Using a data sample of (1310.6 +/- 7.0) x 10(6) J/psi decay events collected with the BESIII detector at BEPCII, we study the electromagnetic Dalitz decay J/psi -> eta ' e(+)e(-) with two dominant eta' decay modes, eta' -> gamma pi(+)pi(-) and eta' -> pi(+)pi(-)eta . The branching fraction is determined to be B(J/psi -> eta ' e(+)e(-)) = (6.59 +/- 0.07 +/- 0.17) x 10(-5), which improves in precision by a factor of 2 over the previous BESIII measurement. A search for the dark photon (gamma') is performed via J/psi -> eta'gamma',gamma' -> e(+)e(-). Excluding the w and phi mass regions, no significant signal is observed in the mass range from 0.1 to 2.1 GeV/e2. We set upper limits at the 90% confidence level on B(J/psi -> eta 'gamma') x B(gamma' -> e(+)e(-)), B(J/psi -> eta 'gamma') and the mixing strength as a function of dark photon mass. This is among the first searches for dark photons in charmonium decays.

Place, publisher, year, edition, pages
2019. Vol. 99, no 1, article id 012013
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-377349DOI: 10.1103/PhysRevD.99.012013ISI: 000456798900002OAI: oai:DiVA.org:uu-377349DiVA, id: diva2:1290426
Funder
Swedish Research Council
Note

Title in WoS: Measurement of B(J/psi -> eta ' e(+)e(-)) and search for a dark photon

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.012013

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-02-20Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejLi, CuiPapenbrock, MichaelPettersson, JoachimSchönning, KarinWolke, Magnus

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Physical Review D: covering particles, fields, gravitation, and cosmology
Subatomic PhysicsAstronomy, Astrophysics and Cosmology

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