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dc.contributor.author
NA64 Collaboration
dc.contributor.author
Banerjee, Debapriya
dc.contributor.author
Cooke, David
dc.contributor.author
Crivelli, Paolo
dc.contributor.author
Depero, Emilio
dc.contributor.author
Radics, Balint
dc.contributor.author
Rubbia, André
dc.contributor.author
et al.
dc.date.accessioned
2018-06-27T08:46:55Z
dc.date.available
2018-06-22T13:53:02Z
dc.date.available
2018-06-27T08:46:55Z
dc.date.issued
2018-06-08
dc.identifier.issn
0031-9007
dc.identifier.issn
1079-7114
dc.identifier.other
10.1103/PhysRevLett.120.231802
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/271713
dc.identifier.doi
10.3929/ethz-b-000271713
dc.description.abstract
We report the first results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e+e− pairs observed in the excited 8Be∗ nucleus decays. Because of its coupling to electrons, the X could be produced in the bremsstrahlung reaction e−Z→e−ZX by a 100 GeV e− beam incident on an active target in the NA64 experiment at the CERN Super Proton Synchrotron and observed through the subsequent decay into a e+e− pair. With 5.4×1010 electrons on target, no evidence for such decays was found, allowing us to set first limits on the X−e− coupling in the range 1.3×10−4≲εe≲4.2×10−4 excluding part of the allowed parameter space. We also set new bounds on the mixing strength of photons with dark photons (A′) from nonobservation of the decay A′→e+e− of the bremsstrahlung A′ with a mass ≲23  MeV.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Physical Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2018-06-08
ethz.journal.title
Physical Review Letters
ethz.journal.volume
120
en_US
ethz.journal.issue
23
en_US
ethz.journal.abbreviated
Phys. rev. lett.
ethz.pages.start
231802
en_US
ethz.size
6 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
NA64 - Search for Dark Sectors in Missing Energy Events
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
New York, NY
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03503 - Rubbia, André / Rubbia, André
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03503 - Rubbia, André / Rubbia, André
ethz.grant.agreementno
169133
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.date.deposited
2018-06-22T13:53:16Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-06-27T08:46:59Z
ethz.rosetta.lastUpdated
2020-02-15T13:45:08Z
ethz.rosetta.versionExported
true
ethz.COinS
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