Publication:
Search for the dark photon in B 0 → A′A′, A′ → e + e −, μ + μ −, and π + π − decays at Belle

Дата
2021
Авторы
Park, S. -H.
Kwon, Y. -J.
Adachi, I.
Aihara, H.
Pakhlov, P.
Journal Title
Journal ISSN
Volume Title
Издатель
Научные группы
Логотип проекта
Научная группа
Belle Collaboration
Организационные подразделения
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Организационная единица
Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
Выпуск журнала
Аннотация
© 2021, The Author(s).We present a search for the dark photon A′ in the B0 → A′A′ decays, where A′ subsequently decays to e+e−, μ+μ−, and π+π−. The search is performed by analyzing 772 × 106BB¯ events collected by the Belle detector at the KEKB e+e− energy-asymmetric collider at the ϒ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c2 ≤ mA′ ≤ 2.62 GeV/c2, and we set upper limits of the branching fraction of B0 → A′A′ at the 90% confidence level. The products of branching fractions, ℬ(B0→A′A′)×ℬ(A′→e+e−)2 and ℬ(B0→A′A′)×ℬ(A′→μ+μ−)2, have limits of the order of 10−8 depending on the A′ mass. Furthermore, considering A′ decay rate to each pair of charged particles, the upper limits of ℬ (B→ A′ A′) are of the order of 10−8–10−5. From the upper limits of ℬ (B→ A′ A′) , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10−2–10−1 at mh′≃mB0 ± 40 MeV/c2 and 10−1–1 at mh′≃mB0 ± 3 GeV/c2. [Figure not available: see fulltext.]
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Цитирование
Search for the dark photon in B 0 → A′A′, A′ → e + e −, μ + μ −, and π + π − decays at Belle / Park, S.-H. [et al.] // Journal of High Energy Physics. - 2021. - 2021. - № 4. - 10.1007/JHEP04(2021)191
URI
https://www.doi.org/10.1007/JHEP04(2021)191
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85104718575&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000644192500001
 https://openrepository.mephi.ru/handle/123456789/23946
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