Center for Axion and Precision Physics Research
[CAPP Student Achievement] Invited Presentation at th 10th BK21 Young Physicists Workshop (February 8, 2018)
Mr. Beomki Yeo (CAPP Student Assistant) was invited to make a presentation at the 10th BK21 Young Physicists Workshop at Seoul National University on February 8, 2018.
Mr. Yeo gave a presentation on Future Experimental Improvement for the Search of Lepton Number-Violation Processes in the eμ Sector.
Beomki Yeo1, Yoshitaka Kuno2, MyeongJae Lee3, and Kai Zuber4
1Department of Physics, Korea Advanced Institue of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
2 Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
3 Center for Axion and Precision Physics Research, Institute for Basic Science (IBS), Daejeon 34051, Republic of Korea
4 Institute for Nuclear and Particle Physics, Technische Universität Dresden, 01069 Dresden, Germany
E-mail address (Presenter): byeo@kaist.ac.kr
The conservation of lepton flavor and total lepton number are no longer guaranteed in the Standard Model after the discovery of neutrino oscillations. Along with the neutrinoless double beta decay, the muon to positon conversion in a muonic atom is one of the most promising channels to investigate the lepton number violation (LNV) processes, and measurement of this conversion is planned in future muon to electron conversion experiments with a muonic atom in a muon-stoppoing target.
In this presentation, we first introduce the theoretical/experimental backgrounds of LNV processes and the state-of-the-art muon to electron conversion experiments, where the measurement of muon to positron will take place as well. Then, we propose experimental strategies to maximize the sensitivity of the muon to positron conversion experiment by introducing the new requirement of the mass relation of M(A,Z-2) < M(A,Z-1), where M(A,Z) is the mass of the muon-stopping target nucleus, to eliminate the backgrounds from radiative muon capture. The sensitivity of the muon to positron conversion is expected to be improved by 4 orders of magnitude in forthcoming experiments using a proper target nucleus that satisfies the mass relation.
References
[1] B. Yeo, et al., Phys. Rev. D 96, 075027 (2017)
[2] T. Geib, A. Merle, and K. Zuber, Phys. Lett. B 764, 157 (2017)
[3] T. Geib and A. Merle, Phys. Rev. D 95, 055009 (2017)
[4] J. M. Berryman, A. de Gouvêa, K. J. Kelly, and A. Kobach, Phys. Rev. D 95, 115010 (2017)