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Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN

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Заглавие Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN
 
Автор Banerjee, D.
Burtsev, Vitaly Evgenjevich
Chumakov, Aleksandr Grigorjevich
Crivelli, Paolo
Dusaev, Renat Ramilyevich
Lyubovitskiy (Lyubovitskij), Valery Efimovich
Trifonov, Andrey Yurievich
Vasilishin, Bogdan Ivanovich
 
Тематика бозоны
фотоны
 
Описание 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.
 
Дата 2020-01-23T09:34:49Z
2020-01-23T09:34:49Z
2018
 
Тип Article
Published version (info:eu-repo/semantics/publishedVersion)
Journal article (info:eu-repo/semantics/article)
 
Идентификатор Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN / D. Banerjee [et al.] // Physical Review Letters. — 2018. — Vol. 120, iss. 23. — [231802, 6 p.].
http://earchive.tpu.ru/handle/11683/57547
10.1103/PhysRevLett.120.231802
 
Язык en
 
Права Open access (info:eu-repo/semantics/openAccess)
 
Формат application/pdf
 
Издатель Томский политехнический университет
 
Источник Physical Review Letters