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Title: | Improved exclusion limit for light dark matter from e+e− annihilation in NA64 |
Authors: | Andreev, Yury Mikhaylovich Banerjee, D. Bernhard, J. Bondi, M. Chumakov, Aleksandr Grigorjevich Dusaev, Renat Ramilyevich Lyubovitskiy (Lyubovitskij), Valery Efimovich Trifonov, Andrey Yurievich Vasilishin, Bogdan Ivanovich |
Issue Date: | 2021 |
Publisher: | American Physical Society |
Citation: | Improved exclusion limit for light dark matter from e+e− annihilation in NA64 / Yu. M. Andreev, D. Banerjee, J. Bernhard [et al.] // Physical Review D. — 2021. — Vol. 104, iss. 9. — [L091701, 7 p.]. |
Abstract: | The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson A′ were set by the NA64 experiment for the mass region mA′≲250 MeV, by analyzing data from the interaction of 2.84×1011 100-GeV electrons with an active thick target and searching for missing-energy events. In this work, by including A′ production via secondary positron annihilation with atomic electrons, we extend these limits in the 200-300 MeV region by almost an order of magnitude, touching for the first time the dark matter relic density constrained parameter combinations. Our new results demonstrate the power of the resonant annihilation process in missing energy dark-matter searches, paving the road to future dedicated e+ beam efforts. |
URI: | http://earchive.tpu.ru/handle/11683/74920 |
Appears in Collections: | Репринты научных публикаций |
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reprint-nw-39240.pdf | 601,29 kB | Adobe PDF | View/Open |
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