Details

Autor(en) / Beteiligte

• Su, Lu-Hao
• Zhao, Shu-Min
• Dong, Xing-Xing
• Cui, Dan-Dan
• Feng, Tai-Fu
• Zhang, Hai-Bin

Titel

The two-loop contributions to muon MDM in U(1)X SSM

Ist Teil von

• The European physical journal. C, Particles and fields, 2021-05, Vol.81 (5), Article 433

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2021

Quelle

Electronic Journals Library

Beschreibungen/Notizen

• The MSSM is extended to the U ( 1 ) X SSM, whose local gauge group is S U ( 3 ) C × S U ( 2 ) L × U ( 1 ) Y × U ( 1 ) X . To obtain the U ( 1 ) X SSM, we add the new superfields to the MSSM, namely: three Higgs singlets η ^ , η ¯ ^ , S ^ and right-handed neutrinos ν ^ i . It can give light neutrino tiny mass at the tree level through the seesaw mechanism. The study of the contribution of the two-loop diagrams to the MDM of muon under U ( 1 ) X SSM provides the possibility for us to search for new physics. In the analytical calculation of the loop diagrams (one-loop and two-loop diagrams), the effective Lagrangian method is used to derive muon MDM. Here, the considered two-loop diagrams include Barr-Zee type diagrams and rainbow type two-loop diagrams, especially Z – Z rainbow two-loop diagram is taken into account. The obtained numerical results can reach 7.4 × 10 - 10 , which can remedy the deviation between SM prediction and experimental data to some extent.