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Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment
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2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, 356-361 p.Article in journal (Refereed) PublishedText
Abstract [en]

Abstract The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, ε 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.

Place, publisher, year, edition, pages
2016. Vol. 757, 356-361 p.
Keyword [en]
Dark matter, Dark forces, Dark photon, U boson
National Category
Subatomic Physics
URN: urn:nbn:se:uu:diva-289366DOI: 10.1016/j.physletb.2016.04.019ISI: 000376800300048OAI: diva2:925043
EU, European Research Council, RII3-CT-2004-506078EU, FP7, Seventh Framework Programme, 227431 FP7-INFRASTRUCTURES-2008-1
Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2016-07-11Bibliographically approved

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Caldeira Balkeståh, LiCao, B.Heijkenskjöld, LenaIkegami Andersson, WalterJohansson, TordKupsc, A.Papenbrock, MichaelWolke, Magnus
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Nuclear Physics
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Physics Letters B
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