Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel; European Physical Journal C; Vol. 81, iss. 10

Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel; European Physical Journal C; Vol. 81, iss. 10

Dettagli Bibliografici
Parent link:	European Physical Journal C Vol. 81, iss. 10.— 2021.— [959, 6 p.]
Enti autori:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики
Altri autori:	Cazzaniga C ., Odagiu P., Depero E. Emanuele, Donskov S. V. Sergey Vasiljevich, Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Trifonov A. Yu. Andrey Yurievich, Vasilishin B. I. Bogdan Ivanovich
Riassunto:	Title screen We report the results of a search for a new vector boson (A′) decaying into two dark matter particles χ1χ2 of different mass. The heavier χ2 particle subsequently decays to χ1 and an off-shell Dark Photon A′∗→e+e−. For a sufficiently large mass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in the muon anomalous magnetic moment at Fermilab. Remarkably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained re-analyzing the previous NA64 searches for an invisible decay A′→χχ¯¯¯ and axion-like or pseudo-scalar particles a→γγ. With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for A′A′ masses from 2meme up to 390 MeV and mixing parameter εε between 3×10−53×10−5 and 2×10−22×10−2.
Lingua:	inglese
Pubblicazione:	2021
Soggetti:	электронный ресурс труды учёных ТПУ
Accesso online:	https://doi.org/10.1140/epjc/s10052-021-09705-5
Natura:	Elettronico Capitolo di libro
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668075

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