Measurement of the branching ratio for the decay <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mo>→</mo><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mrow><msub><mover><mrow><mi>ν</mi></mrow><mrow><mi>¯</mi></mrow></mover><mrow><mi>e</mi></mrow></msub></mrow><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></mrow></math></span>

S. Abachi; M. Derrick; P. Kooijman; B. Musgrave; L. Price; J. Repond; K. Sugano; D. Blockus; B. Brabson; J. -M. Brom; C. Jung; H. Ogren; D. R. Rust; B. Cork; C. Akerlof; J. Chapman; D. Errede; M. T. Ken; D. I. Meyer; H. Neal; D. Nitz; R. Thun; R. Tschirhart; P. Baringer; B. G. Bylsma; R. DeBonte; D. Koltick; E. H. Low; R. L. McIlwain; D. H. Miller; C. R. Ng; E. Shibata

doi:10.1103/PhysRevD.41.1414

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Measurement of the branching ratio for the decay $τ^{-} \to e^{-} {\bar{ν}}_{e} ν_{τ}$

S. Abachi^*, M. Derrick, P. Kooijman^†, B. Musgrave, L. Price, J. Repond, and K. Sugano

D. Blockus, B. Brabson, J. -M. Brom^‡, C. Jung^§, H. Ogren, and D. R. Rust

B. Cork

C. Akerlof, J. Chapman, D. Errede^∥, M. T. Ken, D. I. Meyer, H. Neal, D. Nitz, R. Thun, and R. Tschirhart^*

P. Baringer^¶, B. G. Bylsma^**, R. DeBonte, D. Koltick, E. H. Low^††, R. L. McIlwain, D. H. Miller, C. R. Ng, and E. Shibata

Argonne National Laboratory, Argonne, Illinois 60439

Indiana University, Bloomington, Indiana 47405

Lawrence Berkeley Laboratory, Berkeley, California 94720

University of Michigan, Ann Arbor, Michigan 48109

Purdue University, W. Lafayette, Indiana 47907

^*Present address: Fermi National Accelerator Laboratory, Batavia, IL 60510.
^†Present address: NIKHEF-H, Amsterdam, The Netherlands.
^‡Present address: CRN Division de Hautes Energies, Strasbourg, France.
^§Present address: Stanford Linear Accelerator Center, Stanford, CA 94305.
^∥Present address: University of Wisconsin, Madison, WI 53706.
^¶Present address: University of Kansas, Lawrence, KS 66045.
^**Present address: Ohio State University, Columbus, OH 43210.
^††Present address: Virginia Polytechnic Inst. and State University, Blacksburg, VA 24061.

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Phys. Rev. D 41, 1414 – Published 1 March, 1990

DOI: https://doi.org/10.1103/PhysRevD.41.1414

Abstract

This paper reports a new measurement of the branching ratio for the decay $τ^{-} \to e^{-} {\bar{ν}}_{e} ν_{τ}$ . The data were taken with the High Resolution Spectrometer at the SLAC $e^{+} e^{-}$ colliding-beam facility PEP, operating at $\sqrt{s} = 29$ GeV. The result $B (τ^{-} \to e^{-} {\bar{ν}}_{e} ν_{τ}) = (17.0 \pm 0.5 \pm 0.6) %$ , together with our measurements of the lifetime and the topological branching fractions of the $τ$ lepton are compared with theoretical expectations.

References (20)

M. L. Perl, Phys. Rev. Lett. 35, 1489 (1975)
B. C. Barish and R. Stroynowski, Phys. Rep. 157, 1 (1988) K. K. Gan and M. L. Perl, Int. J. Mod. Phys. A 3, 531 (1988)
H.-J. Gerber, in Proceedings of the International Europhysics Conference on High Energy Physics, Uppsala, Sweden, 1987, edited by O. Bottner (European Physical Society, Petit-Lancy, Switzerland, 1987)
T. N. Truong, Phys. Rev. D 30, 1509 (1984)
K. Hayes, talk presented at the Tau-Charm Factory Workshop, Stanford Linear Accelerator, Stanford, California, 1989 (unpublished)
Omitted endnote
S. Abachi et al., Phys. Lett. B 226, 405 (1989)
D. Bender et al., Phys. Rev. D 30, 515 (1984) G. Baranko et al., Nucl. Instrum. Methods 169, 413 (1980) D. Rubin et al., ibid. 203, 119 (1982) P. Baringer et al., ibid. A254, 542 (1987)
J. S. Loos, Nucl. Instrum. Methods A249, 185 (1986)
M. Derrick et al., Phys. Rev. D 34, 3286 (1986)
S. Abachi et al., Phys. Rev. D 40, 902 (1989)
Omitted endnote
Omitted endnote
Omitted endnote
Omitted endnote
F. A. Berends and R. Kleiss, Nucl. Phys. B177, 237 (1981) F. A. Berends, R. Kleiss, and S. Jadach, ibid. B202, 63 (1982)
Particle Data Group, G. P. Yost et al., Phys. Lett. B 204, 1 (1988)
F. J. Gilman and S. H. Rhie, Phys. Rev. D 31, 1066 (1985) F. J. Gilman, ibid. 35, 3541 (1987) W. J. Marciano and A. Sirlin, Phys. Rev. Lett. 61, 1815 (1988)
S. Abachi et al., Phys. Rev. Lett. 59, 2519 (1987)
K. G. Hayes and M. L. Perl, Phys. Rev. D 38, 335 (1988)

[c1] M. L. Perl, Phys. Rev. Lett. 35, 1489 (1975)

[c2] B. C. Barish and R. Stroynowski, Phys. Rep. 157, 1 (1988) K. K. Gan and M. L. Perl, Int. J. Mod. Phys. A 3, 531 (1988)

[c3] H.-J. Gerber, in Proceedings of the International Europhysics Conference on High Energy Physics, Uppsala, Sweden, 1987, edited by O. Bottner (European Physical Society, Petit-Lancy, Switzerland, 1987)

[c4] T. N. Truong, Phys. Rev. D 30, 1509 (1984)

[c5] K. Hayes, talk presented at the Tau-Charm Factory Workshop, Stanford Linear Accelerator, Stanford, California, 1989 (unpublished)

[c6] Omitted endnote

[c7] S. Abachi et al., Phys. Lett. B 226, 405 (1989)

[c8] D. Bender et al., Phys. Rev. D 30, 515 (1984) G. Baranko et al., Nucl. Instrum. Methods 169, 413 (1980) D. Rubin et al., ibid. 203, 119 (1982) P. Baringer et al., ibid. A254, 542 (1987)

[c9] J. S. Loos, Nucl. Instrum. Methods A249, 185 (1986)

[c10] M. Derrick et al., Phys. Rev. D 34, 3286 (1986)

[c11] S. Abachi et al., Phys. Rev. D 40, 902 (1989)

[c12] Omitted endnote

[c13] Omitted endnote

[c14] Omitted endnote

[c15] Omitted endnote

[c16] F. A. Berends and R. Kleiss, Nucl. Phys. B177, 237 (1981) F. A. Berends, R. Kleiss, and S. Jadach, ibid. B202, 63 (1982)

[c17] Particle Data Group, G. P. Yost et al., Phys. Lett. B 204, 1 (1988)

[c18] F. J. Gilman and S. H. Rhie, Phys. Rev. D 31, 1066 (1985) F. J. Gilman, ibid. 35, 3541 (1987) W. J. Marciano and A. Sirlin, Phys. Rev. Lett. 61, 1815 (1988)

[c19] S. Abachi et al., Phys. Rev. Lett. 59, 2519 (1987)

[c20] K. G. Hayes and M. L. Perl, Phys. Rev. D 38, 335 (1988)

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Measurement of the branching ratio for the decay $τ^{-} \to e^{-} {\bar{ν}}_{e} ν_{τ}$

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Measurement of the branching ratio for the decay τ−→e−ν¯eντ

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Measurement of the branching ratio for the decay $τ^{-} \to e^{-} {\bar{ν}}_{e} ν_{τ}$