A SENSITIVE METHOD TO DISTINGUISH THE SPIN OF THE HEAVY LEPTON <EM>τ </EM>FROM ITS TWO BODY DECAY ENERGY SPECTRA

WU JING-YUAN; CHEN ZHONG-MO; ZHANG ZI-XIAN

Chinese Physics C> 1979, Vol. 3> Issue(1) : 67-74

A SENSITIVE METHOD TO DISTINGUISH THE SPIN OF THE HEAVY LEPTON τ FROM ITS TWO BODY DECAY ENERGY SPECTRA

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Abstract：
We point out that in e⁺+e^-→τ⁺+τ^- for spin 3/2 τ^±the different helicity statesof τ^{^±}will possess different weights.When the beam energy is much larger than themass of τ,we argue that,in some renormalizable models,τ may even have only ±1/2 helieity states.Therefore,the two body d cay energy spectra will show a significantdifference from that of τ with spin 1/2.This provides us with a very sensitivemethod to distinguish the spin of τ.

References

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J. Kirkby, Invited talk presented at the 1977 International Symposium on Lepton and Photon Interactions at High Energies, Hamburg, SLAG-PUB-2040.[2] K.Fujikawa and N. Nawamoto, Phys, Rev. Letters, 35 (1975), 1560.[3] 伍经无、李小源、陈中祺，高能物理与核物理，2 (1978), 286.[4] D. Lurie, "Particles and Fields ", Interecience, 1968.[5] T. D. Lee and C. N. Yang, Phys. Rev., 128 (1962), 885.[6] G.J. Komen. Phys. Letters. 68B (1977). 275.[7] T. D. Lee and G. C. Wick, Phys. Rev., D2 (1970), 1033.[8] H. Georgi and S. L. Glashow, Phys. Rev. Letters, 28 (1972), 1494.[9] PLUTO Collaboration, G. Alexander et al., Preprint, DESY 78/30.[10] G. J. Feldman, SLAC-PUB-2138 (1978).[11] Jasper Kirkby, SLAC-PUB-2127 (1978).[12] Y. S. Tsai, SLAC-PUB-2105 (1978).

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WU JING-YUAN, CHEN ZHONG-MO and ZHANG ZI-XIAN. A SENSITIVE METHOD TO DISTINGUISH THE SPIN OF THE HEAVY LEPTON τ FROM ITS TWO BODY DECAY ENERGY SPECTRA[J]. Chinese Physics C, 1979, 3(1): 67-74.

WU JING-YUAN, CHEN ZHONG-MO and ZHANG ZI-XIAN. A SENSITIVE METHOD TO DISTINGUISH THE SPIN OF THE HEAVY LEPTON τ FROM ITS TWO BODY DECAY ENERGY SPECTRA[J]. Chinese Physics C, 1979, 3(1): 67-74. shu

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Received: 1978-05-17
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

A SENSITIVE METHOD TO DISTINGUISH THE SPIN OF THE HEAVY LEPTON τ FROM ITS TWO BODY DECAY ENERGY SPECTRA

Received Date: 1978-05-17
Accepted Date: 1900-01-01
Available Online: 1979-02-05

Abstract: We point out that in e⁺+e^-→τ⁺+τ^- for spin 3/2 τ^±the different helicity statesof τ^{^±}will possess different weights.When the beam energy is much larger than themass of τ,we argue that,in some renormalizable models,τ may even have only ±1/2 helieity states.Therefore,the two body d cay energy spectra will show a significantdifference from that of τ with spin 1/2.This provides us with a very sensitivemethod to distinguish the spin of τ.