Improved exclusion limit for light dark matter from e+e− annihilation in NA64; Physical Review D; Vol. 104, iss. 9

Improved exclusion limit for light dark matter from e+e− annihilation in NA64; Physical Review D; Vol. 104, iss. 9

Bibliografiska uppgifter
Parent link:	Physical Review D: covering particles, fields, gravitation, and cosmology Vol. 104, iss. 9.— 2021.— [L091701, 7 p.]
Institutionella upphovsmän:	Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики, Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Övriga upphovsmän:	Andreev Yu. M. Yury Mikhaylovich, Banerjee D., Bernhard J., Bondi M., 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
Sammanfattning:	Title screen 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.
Språk:	engelska
Publicerad:	2021
Ämnen:	электронный ресурс труды учёных ТПУ
Länkar:	http://earchive.tpu.ru/handle/11683/74920 https://doi.org/10.1103/PhysRevD.104.L091701
Materialtyp:	Elektronisk Bokavsnitt
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668029

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