摘要We study the lepton flavor violating μ− →e-2γ decay induced by the mediation of heavy leptons, such as the excited and fourth generation leptons. Effects of these leptons in μ− →e-2γ decay are examined. It is found that the branching ratio of this decay is very sensitive to excited and fourth generation leptons. Furthermore, we obtain the bounds on model parameters by using the current experimental limit of this decay.
Abstract：We study the lepton flavor violating μ− →e-2γ decay induced by the mediation of heavy leptons, such as the excited and fourth generation leptons. Effects of these leptons in μ− →e-2γ decay are examined. It is found that the branching ratio of this decay is very sensitive to excited and fourth generation leptons. Furthermore, we obtain the bounds on model parameters by using the current experimental limit of this decay.
[1] SNO collaboration 2007 Phys. Rev. C 75 045502
[2] Nakamura K et al (Particle Data Group) 2010 J. Phys. G 37 075021
[3] Baur U et al 1990 Phys. Rev. D 42 815
[4] Boos E et al 2002 Phys. Rev. D 66 013011
[5] Chekanov S et al (ZEUS Collaborations) 2002 Phys. Lett. B 549 32
[6] Aaron F D et al (H1 Collaborations) 2008 Phys. Lett. B 666 131
[7] Abbiendi G et al (OPAL Collaboration) 2002 Phys. Lett. B 544 57
[8] Achard P et al (L3 Collaboration) 2003 Phys. Lett. B 568 23
[9] Abdallah J et al (DELPHI Collaboration) 2004 Eur. Phys. J. C 37 405
[10] Abdallah J et al (DELPHI Collaboration) 2006 Eur. Phys. J. C 46 277
[11] Abulencia A et al (CDF Collaboration) 2006 Phys. Rev. Lett. 97 191802
[12] Éboli O J P et al 2002 Phys. Rev. D 65 075003
[13] İnan S C 2010 Phys. Rev. D 81 115002
[14] Cakir O et al 2004 Phys. Rev. D 70 075011
[15] Cakir O et al 2004 Phys. Rev. D 70 075017
[16] Cakir O and Ozansoy A 2008 Phys. Rev. D 77 035002
[17] Éboli O J P et al 1996 Phys. Rev. D 53 1253
[18] Brodsky S J and Drell S D 1980 Phys. Rev. D 22 2236
[19] Cabibbo N et al 1984 Phys. Lett. B 139 459
[20] Kuhn J and Zerwas P 1984 Phys. Lett. B 147 189
[21] Hagiwara K et al 1985 Z. Phys. C 29 115
[22] Boudjema F and Djouadi A 1990 Phys. Lett. B 240 485
[23] Boudjema F et al 1993 Z. Phys. C 57 425
[24] Renard F M 1982 Phys. Lett. B 116 264
[25] del Aguila F et al 1984 Phys. Lett. B 140 237
[26] Suzuki M 1984 Phys. Lett. B 143 237
[27] Datta A and Raychaudhuri S 1994 Phys. Rev. D 49 4762
[28] Çelikel A, Çiftçi A K and Sultansoy S 1995 Phys. Lett. B 342 257
[29] Sultansoy S, arXiv:hep-ph/0004271; arXiv:hep-ph/0610279
[30] Fritzsch H and Holtmannspotter D 1999 Phys. Lett. B 457 186
[31] Atağ S et al 1996 Phys. Rev. D 54 5745
[32] Rizzo T G 1997 Phys. Rev. D 56 3074
[33] Çiftçi R, Çiftçi A K and Sultansoy S 2010 Eur. Phys. Lett. 90 41001
[34] Çiftçi A K, Çiftçi R and Sultansoy S 2008 Mod. Phys. Lett. A 23 1047
2011, Vol. 28 
