There is a growing interest for the search of new light gauge bosons. The small mass of a new boson can turn various kinds of low-energy experiments to a new discovery machine, depending on their couplings to the Standard Model particles. It is important to understand the properties of each type of gauge boson and their current constraints for a given mass. While the dark photon (which couples to the electric charges) and the U(1)B-L gauge boson have been well studied in an extensive mass range, the U(1)L gauge boson has not been fully investigated yet. We consider the gauge boson of the U(1)L in a wide mass range mZ′≈ 0-1012eV and investigate the constraints on its coupling from various experiments, discussing the similarities and differences from the dark photon and the U(1)B-L gauge boson.
Bibliographical noteFunding Information:
The work of Y. S. Jeong and C. S. Kim was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government of the Ministry of Education, Science and Technology (MEST) (Grant Nos. 2011-0017430 and 20110020333) and Institute of Physics and Applied Physics (IPAP). The work of H.-S. Lee was supported in part by the CERN-Korea fellowship and the IBS (Project Code IBS-R018-D1). Y. S. Jeong thanks KIAS for the hospitality while the part of this work was performed
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Astronomy and Astrophysics