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
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Автор |
Banerjee, D.
Burtsev, Vitaly Evgenjevich Chumakov, Aleksandr Grigorjevich Crivelli, Paolo Dusaev, Renat Ramilyevich Lyubovitskiy (Lyubovitskij), Valery Efimovich Trifonov, Andrey Yurievich Vasilishin, Bogdan Ivanovich |
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Тематика |
бозоны
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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.
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Дата |
2020-01-23T09:34:49Z
2020-01-23T09:34:49Z 2018 |
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Тип |
Article
Published version (info:eu-repo/semantics/publishedVersion) Journal article (info:eu-repo/semantics/article) |
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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 |
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Язык |
en
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Права |
Open access (info:eu-repo/semantics/openAccess)
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Формат |
application/pdf
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Издатель |
Томский политехнический университет
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Источник |
Physical Review Letters
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