https://doi.org/10.1140/epjc/s10052-016-4561-3
Regular Article - Theoretical Physics
The new interaction suggested by the anomalous 
Be transition sets a rigorous constraint on the mass range of dark matter
1
School of Science, Southwest University of Science and Technology, Mianyang, 621010, China
2
School of Physics, Nankai University, Tianjin, 300071, China
* e-mail: jialb@mail.nankai.edu.cn
Received:
24
August
2016
Accepted:
7
December
2016
Published online:
24
December
2016
The WIMPs are considered to belong to the favorable dark matter (DM) candidates, but the upper bounds on the interactions between DM and standard model (SM) particles obtained by the upgraded facilities of DM direct detection get lower and lower. Researchers turn their attention to the search for less massive DM candidates, i.e. light dark matter of the MeV scale. The recently measured anomalous transition in Be suggests that there exists a vectorial boson which may mediate the interaction between DM and SM particles. Based on this scenario, we combine the relevant cosmological data to constrain the mass range of DM, and we have found that there exists a model parameter space where the requirements are satisfied, a range of 
16.7 MeV for scalar DM, and 
MeV for vectorial DM is demanded. Then a possibility of directly detecting such light DM particles via DM–electron scattering is briefly studied in this framework.
© The Author(s), 2016
