Chinese Physics C > 1978, Vol. 2 > Issue(3): 236-241

THE DIFFICULTY OF THE DECAYτ→πν_τAND SPIN 3/2 HEAVY LEPTON

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Abstract：
We discuss the suppression of the decay of heavy lepton τinto πv_τ,by assuming that τand/or v_τcarry spin 3/2. For the case of spin 3/2 Tand spin 1/2 v_τ, using the weak current ψ_μ ^(τ)( a+ b _^γ5) Ψ ^(v_τ)we find that the πv_τdecay channel relative to the v_τv_ll^-channel is suppressed 12/5 times, while other decay channels are not changed appreciably. △R= σ（e ⁺e ^-→ τ ⁺ τ ^-）/ σ（e ⁺e ^-→ μ ⁺ μ ^-） is also discussed.

References

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M. L. Perl, Invited talk presented at the 1977 International Symposium on Lepton and Photon Interactions at High Energies, Hamberg, SLAC-PUB-2022.[2] G. Knies, ibid., DESY-77/74.[3] S. Yamada, ibid.[4] J. Kirby, ibid，SLAC-PUB-2040.[5] L.Maiani, ibid.[6] C. P. Korthals-altes, P. Mery, Phys. Lett ，72B(1977)，375.[7] See for example, D. Lurie, "Particles and Fields ", (Interscience, 1968).[8] S. Weinberg, Phys, Rev. Lett., 18(1967), 507.[9] T. Das, V. 8. Mathur and S. Okubo, Phys. Rev. Lett., 18(1967), 76.[10] B. Richter, Proc. of the XVII International Conference an High Energy Physics, edited by J. R. Smith, IV-37.[11] A. Silverman, Proc. of the 1975 International Symposium on Lepton anal Photon Interactions at High Energies, Stanford, edited by W. T. Kirk, 355.[12] Johnson, E. C. G. Sudarehan, Ann. Phys., (N. Y.), 13(I961), 126. G. Velo and D. Zwanziger, Phys. Rev., 186(1969), 1337; ibid., 188(1969), 2218.

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WU JING-YUAN, LI XIAO-YUAN and CHEN ZHONG-MO. THE DIFFICULTY OF THE DECAY τ→ πν_τAND SPIN 3/2 HEAVY LEPTON[J]. Chinese Physics C, 1978, 2(3): 236-241.

WU JING-YUAN, LI XIAO-YUAN and CHEN ZHONG-MO. THE DIFFICULTY OF THE DECAY τ→ πν_τAND SPIN 3/2 HEAVY LEPTON[J]. Chinese Physics C, 1978, 2(3): 236-241. shu

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Received: 1978-01-31
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

THE DIFFICULTY OF THE DECAYτ→πν_τAND SPIN 3/2 HEAVY LEPTON

Received Date:1978-01-31
Accepted Date:1900-01-01
Available Online:1978-06-05

Abstract:We discuss the suppression of the decay of heavy leptonτintoπv_τ,by assuming thatτand/orv_τcarry spin 3/2. For the case of spin 3/2Tand spin 1/2v_τ, using the weak currentψ_μ^(τ)(a+b_^γ5)Ψ^(v_τ)we find that theπv_τdecay channel relative to thev_τv_ll^-channel is suppressed 12/5 times, while other decay channels are not changed appreciably.△R=σ（e⁺e^-→τ⁺τ^-）/σ（e⁺e^-→μ⁺μ^-） is also discussed.