TY - JOUR
T1 - μ-e conversion with four generations
AU - Deshpande, N. G.
AU - Enkhbat, T.
AU - Fukuyama, T.
AU - He, X. G.
AU - Tsai, L. H.
AU - Tsumura, K.
N1 - Funding Information:
We thank Dr. Goto and Dr. Nomura for useful discussions. This work was partially supported by USA DOE grant number DE-FG02-96ER40969 , Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan , # 20540282 and # 21104004 , NSC and NCTS of ROC, and SJTU 985 grant of China.
PY - 2011/9/26
Y1 - 2011/9/26
N2 - We study μ-e conversion with sequential four generations. A large mass for the fourth generation neutrino can enhance the conversion rate by orders of magnitude. We compare constraints obtained from μ-e conversion using experimental bounds on various nuclei with those from μ→eγ and μ→eēe. We find that the current bound from μ-e conversion with Au puts the most stringent constraint in this model. The relevant flavor changing parameter λ;μe=V*4μVe4 is constrained to be less than 1.6×10-5 for the fourth generation neutrino mass larger than 100 GeV. Implications for future μ-e conversion, μ→eγ and μ→eēe experiments are discussed.
AB - We study μ-e conversion with sequential four generations. A large mass for the fourth generation neutrino can enhance the conversion rate by orders of magnitude. We compare constraints obtained from μ-e conversion using experimental bounds on various nuclei with those from μ→eγ and μ→eēe. We find that the current bound from μ-e conversion with Au puts the most stringent constraint in this model. The relevant flavor changing parameter λ;μe=V*4μVe4 is constrained to be less than 1.6×10-5 for the fourth generation neutrino mass larger than 100 GeV. Implications for future μ-e conversion, μ→eγ and μ→eēe experiments are discussed.
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U2 - 10.1016/j.physletb.2011.08.045
DO - 10.1016/j.physletb.2011.08.045
M3 - Article
AN - SCOPUS:80052406879
VL - 703
SP - 562
EP - 566
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 5
ER -