Measurement of the τ neutrino helicity and michel parameters in polarized e+e− collisions

K. Abe; K. Abe; T. Akagi; N. J. Allen; W. W. Ash; D. Aston; K. G. Baird; C. Baltay; H. R. Band; M. B. Barakat; G. Baranko; O. Bardon; T. L. Barklow; G. L. Bashindzhagyan; A. O. Bazarko; R. Ben-David; A. C. Benvenuti; G. M. Bilei; D. Bisello; G. Blaylock; J. R. Bogart; B. Bolen; T. Bolton; G. R. Bower; J. E. Brau; M. Breidenbach; W. M. Bugg; D. Burke; T. H. Burnett; P. N. Burrows; W. Busza; A. Calcaterra; D. O. Caldwell; D. Calloway; B. Camanzi; M. Carpinelli; R. Cassell; R. Castaldi; A. Castro; M. Cavalli-Sforza; A. Chou; E. Church; H. O. Cohn; J. A. Coller; V. Cook; R. Cotton; R. F. Cowan; D. G. Coyne; G. Crawford; A. D’oliveira; C. J.S. Damerell; M. Daoudi; R. De Sangro; R. Dell’orso; P. J. Dervan; M. Dima; D. N. Dong; P. Y.C. Du; R. Dubois; B. I. Eisenstein; R. Elia; E. Etzion; S. Fahey; D. Falciai; C. Fan; J. P. Fernandez; M. J. Fero; R. Frey; K. Furuno; T. Gillman; G. Gladding; S. Gonzalez; E. L. Hart; J. L. Harton; A. Hasan; Y. Hasegawa; K. Hasuko; S. J. Hedges; S. S. Hertzbach; M. D. Hildreth; J. Huber; M. E. Huffer; E. W. Hughes; H. Hwang; Y. Iwasaki; D. J. Jackson; P. Jacques; J. A. Jaros; A. S. Johnson; J. R. Johnson; R. A. Johnson; T. Junk; R. Kajikawa; M. Kalelkar; H. J. Kang; I. Karliner; H. Kawahara; H. W. Kendall; Y. D. Kim; M. E. King; R. King; R. R. Kofler; N. M. Krishna; R. S. Kroeger; J. F. Labs; M. Langston; A. Lath; J. A. Lauber; D. W.G.S. Leith; V. Lia; M. X. Liu; X. Liu; M. Loreti; A. Lu; H. L. Lynch; J. Ma; G. Mancinelli; S. Manly; G. Mantovani; T. W. Markiewicz; T. Maruyama; H. Masuda; E. Mazzucato; A. K. Mc Kemey; B. T. Meadows; R. Messner; P. M. Mockett; K. C. Moffeit; T. B. Moore; D. Muller; T. Nagamine; S. Narita; U. Nauenberg; H. Neal; M. Nussbaum; Y. Ohnishi; L. S. Osborne; R. S. Panvini; C. H. Park; H. Park; T. J. Pavel; I. Peruzzi; M. Piccolo; L. Piemontese; E. Pieroni; K. T. Pitts; R. J. Plano; R. Prepost; C. Y. Prescott; G. D. Punkar; J. Quigley; B. N. Ratcliff; T. W. Reeves; J. Reidy; P. L. Reinertsen; P. E. Rensing; L. S. Rochester; P. C. Rowson; J. J. Russell; O. H. Saxton; T. Schalk; R. H. Schindler; B. A. Schumm; S. Sen; V. V. Serbo; M. H. Shaevitz; J. T. Shank; G. Shapiro; D. J. Sherden; K. D. Shmakov; C. Simopoulos; N. B. Sinev; S. R. Smith; M. B. Smy; J. A. Snyder; P. Stamer; H. Steiner; R. Steiner; M. G. Strauss; D. Su; F. Suekane; A. Sugiyama; S. Suzuki; M. Swartz; A. Szumilo; T. Takahashi; F. E. Taylor; E. Torrence; A. I. Trandafir; J. D. Turk; T. Usher; J. Vavra; C. Vannini; E. Vella; J. P. Venuti; R. Verdier; P. G. Verdini; D. L. Wagner; S. R. Wagner; A. P. Waite; S. J. Watts; A. W. Weidemann; E. R. Weiss; J. S. Whitaker; S. L. White; F. J. Wickens; D. A. Williams; D. C. Williams; S. H. Williams; S. Willocq; R. J. Wilson; W. J. Wisniewski; M. Woods; G. B. Word; J. Wyss; R. K. Yamamoto; J. M. Yamartino; X. Yang; J. Yashima; S. J. Yellin; C. C. Young; H. Yuta; G. Zapalac; R. W. Zdarko; J. Zhou

doi:10.1103/PhysRevLett.78.4691

Measurement of the τ neutrino helicity and michel parameters in polarized e⁺e⁻ collisions

K. Abe, K. Abe, T. Akagi, N. J. Allen, W. W. Ash, D. Aston, K. G. Baird, C. Baltay, H. R. Band, M. B. Barakat, G. Baranko, O. Bardon, T. L. Barklow, G. L. Bashindzhagyan, A. O. Bazarko, R. Ben-David, A. C. Benvenuti, G. M. Bilei, D. Bisello, G. BlaylockJ. R. Bogart, B. Bolen, T. Bolton, G. R. Bower, J. E. Brau, M. Breidenbach, W. M. Bugg, D. Burke, T. H. Burnett, P. N. Burrows, W. Busza, A. Calcaterra, D. O. Caldwell, D. Calloway, B. Camanzi, M. Carpinelli, R. Cassell, R. Castaldi, A. Castro, M. Cavalli-Sforza, A. Chou, E. Church, H. O. Cohn, J. A. Coller, V. Cook, R. Cotton, R. F. Cowan, D. G. Coyne, G. Crawford, A. D’oliveira, C. J.S. Damerell, M. Daoudi, R. De Sangro, R. Dell’orso, P. J. Dervan, M. Dima, D. N. Dong, P. Y.C. Du, R. Dubois, B. I. Eisenstein, R. Elia, E. Etzion, S. Fahey, D. Falciai, C. Fan, J. P. Fernandez, M. J. Fero, R. Frey, K. Furuno, T. Gillman, G. Gladding, S. Gonzalez, E. L. Hart, J. L. Harton, A. Hasan, Y. Hasegawa, K. Hasuko, S. J. Hedges, S. S. Hertzbach, M. D. Hildreth, J. Huber, M. E. Huffer, E. W. Hughes, H. Hwang, Y. Iwasaki, D. J. Jackson, P. Jacques, J. A. Jaros, A. S. Johnson, J. R. Johnson, R. A. Johnson, T. Junk, R. Kajikawa, M. Kalelkar, H. J. Kang, I. Karliner, H. Kawahara, H. W. Kendall, Y. D. Kim, M. E. King, R. King, R. R. Kofler, N. M. Krishna, R. S. Kroeger, J. F. Labs, M. Langston, A. Lath, J. A. Lauber, D. W.G.S. Leith, V. Lia, M. X. Liu, X. Liu, M. Loreti, A. Lu, H. L. Lynch, J. Ma, G. Mancinelli, S. Manly, G. Mantovani, T. W. Markiewicz, T. Maruyama, H. Masuda, E. Mazzucato, A. K. Mc Kemey, B. T. Meadows, R. Messner, P. M. Mockett, K. C. Moffeit, T. B. Moore, D. Muller, T. Nagamine, S. Narita, U. Nauenberg, H. Neal, M. Nussbaum, Y. Ohnishi, L. S. Osborne, R. S. Panvini, C. H. Park, H. Park, T. J. Pavel, I. Peruzzi, M. Piccolo, L. Piemontese, E. Pieroni, K. T. Pitts, R. J. Plano, R. Prepost, C. Y. Prescott, G. D. Punkar, J. Quigley, B. N. Ratcliff, T. W. Reeves, J. Reidy, P. L. Reinertsen, P. E. Rensing, L. S. Rochester, P. C. Rowson, J. J. Russell, O. H. Saxton, T. Schalk, R. H. Schindler, B. A. Schumm, S. Sen, V. V. Serbo, M. H. Shaevitz, J. T. Shank, G. Shapiro, D. J. Sherden, K. D. Shmakov, C. Simopoulos, N. B. Sinev, S. R. Smith, M. B. Smy, J. A. Snyder, P. Stamer, H. Steiner, R. Steiner, M. G. Strauss, D. Su, F. Suekane, A. Sugiyama, S. Suzuki, M. Swartz, A. Szumilo, T. Takahashi, F. E. Taylor, E. Torrence, A. I. Trandafir, J. D. Turk, T. Usher, J. Vavra, C. Vannini, E. Vella, J. P. Venuti, R. Verdier, P. G. Verdini, D. L. Wagner, S. R. Wagner, A. P. Waite, S. J. Watts, A. W. Weidemann, E. R. Weiss, J. S. Whitaker, S. L. White, F. J. Wickens, D. A. Williams, D. C. Williams, S. H. Williams, S. Willocq, R. J. Wilson, W. J. Wisniewski, M. Woods, G. B. Word, J. Wyss, R. K. Yamamoto, J. M. Yamartino, X. Yang, J. Yashima, S. J. Yellin, C. C. Young, H. Yuta, G. Zapalac, R. W. Zdarko, J. Zhou

Research Center for Neutrino Science (RCNS)

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We present a new measurement of the τ neutrino helicity h_ντ and the τ Michel parameters ρ, η, ξ, and the product δξ. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the τ decay spectra, using the 1993-1995 SLD data sample of 4328 e⁺e⁻→Z⁰ → τ⁺ τ⁻ events. From the decays τ →πν_τ and τ →ρν_τ we obtain a combined value h_ντ = −0.93±0.10±0.04. The leptonic decay channels yield combined values of ρ=0.72±0.09±0.03, ξ=1.05±0.35±0.04, and δξ=0.88±0.27±0.04.

Original language	English
Pages (from-to)	4691-4696
Number of pages	6
Journal	Physical review letters
Volume	78
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.78.4691
Publication status	Published - 1997

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1103/PhysRevLett.78.4691

Cite this

Abe, K., Abe, K., Akagi, T., Allen, N. J., Ash, W. W., Aston, D., Baird, K. G., Baltay, C., Band, H. R., Barakat, M. B., Baranko, G., Bardon, O., Barklow, T. L., Bashindzhagyan, G. L., Bazarko, A. O., Ben-David, R., Benvenuti, A. C., Bilei, G. M., Bisello, D., ... Zhou, J. (1997). Measurement of the τ neutrino helicity and michel parameters in polarized e⁺e⁻ collisions. Physical review letters, 78(25), 4691-4696. https://doi.org/10.1103/PhysRevLett.78.4691

Abe, K, Abe, K, Akagi, T, Allen, NJ, Ash, WW, Aston, D, Baird, KG, Baltay, C, Band, HR, Barakat, MB, Baranko, G, Bardon, O, Barklow, TL, Bashindzhagyan, GL, Bazarko, AO, Ben-David, R, Benvenuti, AC, Bilei, GM, Bisello, D, Blaylock, G, Bogart, JR, Bolen, B, Bolton, T, Bower, GR, Brau, JE, Breidenbach, M, Bugg, WM, Burke, D, Burnett, TH, Burrows, PN, Busza, W, Calcaterra, A, Caldwell, DO, Calloway, D, Camanzi, B, Carpinelli, M, Cassell, R, Castaldi, R, Castro, A, Cavalli-Sforza, M, Chou, A, Church, E, Cohn, HO, Coller, JA, Cook, V, Cotton, R, Cowan, RF, Coyne, DG, Crawford, G, D’oliveira, A, Damerell, CJS, Daoudi, M, De Sangro, R, Dell’orso, R, Dervan, PJ, Dima, M, Dong, DN, Du, PYC, Dubois, R, Eisenstein, BI, Elia, R, Etzion, E, Fahey, S, Falciai, D, Fan, C, Fernandez, JP, Fero, MJ, Frey, R, Furuno, K, Gillman, T, Gladding, G, Gonzalez, S, Hart, EL, Harton, JL, Hasan, A, Hasegawa, Y, Hasuko, K, Hedges, SJ, Hertzbach, SS, Hildreth, MD, Huber, J, Huffer, ME, Hughes, EW, Hwang, H, Iwasaki, Y, Jackson, DJ, Jacques, P, Jaros, JA, Johnson, AS, Johnson, JR, Johnson, RA, Junk, T, Kajikawa, R, Kalelkar, M, Kang, HJ, Karliner, I, Kawahara, H, Kendall, HW, Kim, YD, King, ME, King, R, Kofler, RR, Krishna, NM, Kroeger, RS, Labs, JF, Langston, M, Lath, A, Lauber, JA, Leith, DWGS, Lia, V, Liu, MX, Liu, X, Loreti, M, Lu, A, Lynch, HL, Ma, J, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, TW, Maruyama, T, Masuda, H, Mazzucato, E, Mc Kemey, AK, Meadows, BT, Messner, R, Mockett, PM, Moffeit, KC, Moore, TB, Muller, D, Nagamine, T, Narita, S, Nauenberg, U, Neal, H, Nussbaum, M, Ohnishi, Y, Osborne, LS, Panvini, RS, Park, CH, Park, H, Pavel, TJ, Peruzzi, I, Piccolo, M, Piemontese, L, Pieroni, E, Pitts, KT, Plano, RJ, Prepost, R, Prescott, CY, Punkar, GD, Quigley, J, Ratcliff, BN, Reeves, TW, Reidy, J, Reinertsen, PL, Rensing, PE, Rochester, LS, Rowson, PC, Russell, JJ, Saxton, OH, Schalk, T, Schindler, RH, Schumm, BA, Sen, S, Serbo, VV, Shaevitz, MH, Shank, JT, Shapiro, G, Sherden, DJ, Shmakov, KD, Simopoulos, C, Sinev, NB, Smith, SR, Smy, MB, Snyder, JA, Stamer, P, Steiner, H, Steiner, R, Strauss, MG, Su, D, Suekane, F, Sugiyama, A, Suzuki, S, Swartz, M, Szumilo, A, Takahashi, T, Taylor, FE, Torrence, E, Trandafir, AI, Turk, JD, Usher, T, Vavra, J, Vannini, C, Vella, E, Venuti, JP, Verdier, R, Verdini, PG, Wagner, DL, Wagner, SR, Waite, AP, Watts, SJ, Weidemann, AW, Weiss, ER, Whitaker, JS, White, SL, Wickens, FJ, Williams, DA, Williams, DC, Williams, SH, Willocq, S, Wilson, RJ, Wisniewski, WJ, Woods, M, Word, GB, Wyss, J, Yamamoto, RK, Yamartino, JM, Yang, X, Yashima, J, Yellin, SJ, Young, CC, Yuta, H, Zapalac, G, Zdarko, RW & Zhou, J 1997, 'Measurement of the τ neutrino helicity and michel parameters in polarized e⁺e⁻ collisions', Physical review letters, vol. 78, no. 25, pp. 4691-4696. https://doi.org/10.1103/PhysRevLett.78.4691

@article{2f79f759035941529bd16ccee4b4e2cb,

title = "Measurement of the τ neutrino helicity and michel parameters in polarized e+e− collisions",

abstract = "We present a new measurement of the τ neutrino helicity hντ and the τ Michel parameters ρ, η, ξ, and the product δξ. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the τ decay spectra, using the 1993-1995 SLD data sample of 4328 e+e−→Z0 → τ+ τ− events. From the decays τ →πντ and τ →ρντ we obtain a combined value hντ = −0.93±0.10±0.04. The leptonic decay channels yield combined values of ρ=0.72±0.09±0.03, ξ=1.05±0.35±0.04, and δξ=0.88±0.27±0.04.",

author = "K. Abe and K. Abe and T. Akagi and Allen, {N. J.} and Ash, {W. W.} and D. Aston and Baird, {K. G.} and C. Baltay and Band, {H. R.} and Barakat, {M. B.} and G. Baranko and O. Bardon and Barklow, {T. L.} and Bashindzhagyan, {G. L.} and Bazarko, {A. O.} and R. Ben-David and Benvenuti, {A. C.} and Bilei, {G. M.} and D. Bisello and G. Blaylock and Bogart, {J. R.} and B. Bolen and T. Bolton and Bower, {G. R.} and Brau, {J. E.} and M. Breidenbach and Bugg, {W. M.} and D. Burke and Burnett, {T. H.} and Burrows, {P. N.} and W. Busza and A. Calcaterra and Caldwell, {D. O.} and D. Calloway and B. Camanzi and M. Carpinelli and R. Cassell and R. Castaldi and A. Castro and M. Cavalli-Sforza and A. Chou and E. Church and Cohn, {H. O.} and Coller, {J. A.} and V. Cook and R. Cotton and Cowan, {R. F.} and Coyne, {D. G.} and G. Crawford and A. D{\textquoteright}oliveira and Damerell, {C. J.S.} and M. Daoudi and {De Sangro}, R. and R. Dell{\textquoteright}orso and Dervan, {P. J.} and M. Dima and Dong, {D. N.} and Du, {P. Y.C.} and R. Dubois and Eisenstein, {B. I.} and R. Elia and E. Etzion and S. Fahey and D. Falciai and C. Fan and Fernandez, {J. P.} and Fero, {M. J.} and R. Frey and K. Furuno and T. Gillman and G. Gladding and S. Gonzalez and Hart, {E. L.} and Harton, {J. L.} and A. Hasan and Y. Hasegawa and K. Hasuko and Hedges, {S. J.} and Hertzbach, {S. S.} and Hildreth, {M. D.} and J. Huber and Huffer, {M. E.} and Hughes, {E. W.} and H. Hwang and Y. Iwasaki and Jackson, {D. J.} and P. Jacques and Jaros, {J. A.} and Johnson, {A. S.} and Johnson, {J. R.} and Johnson, {R. A.} and T. Junk and R. Kajikawa and M. Kalelkar and Kang, {H. J.} and I. Karliner and H. Kawahara and Kendall, {H. W.} and Kim, {Y. D.} and King, {M. E.} and R. King and Kofler, {R. R.} and Krishna, {N. M.} and Kroeger, {R. S.} and Labs, {J. F.} and M. Langston and A. Lath and Lauber, {J. A.} and Leith, {D. W.G.S.} and V. Lia and Liu, {M. X.} and X. Liu and M. Loreti and A. Lu and Lynch, {H. L.} and J. Ma and G. Mancinelli and S. Manly and G. Mantovani and Markiewicz, {T. W.} and T. Maruyama and H. Masuda and E. Mazzucato and {Mc Kemey}, {A. K.} and Meadows, {B. T.} and R. Messner and Mockett, {P. M.} and Moffeit, {K. C.} and Moore, {T. B.} and D. Muller and T. Nagamine and S. Narita and U. Nauenberg and H. Neal and M. Nussbaum and Y. Ohnishi and Osborne, {L. S.} and Panvini, {R. S.} and Park, {C. H.} and H. Park and Pavel, {T. J.} and I. Peruzzi and M. Piccolo and L. Piemontese and E. Pieroni and Pitts, {K. T.} and Plano, {R. J.} and R. Prepost and Prescott, {C. Y.} and Punkar, {G. D.} and J. Quigley and Ratcliff, {B. N.} and Reeves, {T. W.} and J. Reidy and Reinertsen, {P. L.} and Rensing, {P. E.} and Rochester, {L. S.} and Rowson, {P. C.} and Russell, {J. J.} and Saxton, {O. H.} and T. Schalk and Schindler, {R. H.} and Schumm, {B. A.} and S. Sen and Serbo, {V. V.} and Shaevitz, {M. H.} and Shank, {J. T.} and G. Shapiro and Sherden, {D. J.} and Shmakov, {K. D.} and C. Simopoulos and Sinev, {N. B.} and Smith, {S. R.} and Smy, {M. B.} and Snyder, {J. A.} and P. Stamer and H. Steiner and R. Steiner and Strauss, {M. G.} and D. Su and F. Suekane and A. Sugiyama and S. Suzuki and M. Swartz and A. Szumilo and T. Takahashi and Taylor, {F. E.} and E. Torrence and Trandafir, {A. I.} and Turk, {J. D.} and T. Usher and J. Vavra and C. Vannini and E. Vella and Venuti, {J. P.} and R. Verdier and Verdini, {P. G.} and Wagner, {D. L.} and Wagner, {S. R.} and Waite, {A. P.} and Watts, {S. J.} and Weidemann, {A. W.} and Weiss, {E. R.} and Whitaker, {J. S.} and White, {S. L.} and Wickens, {F. J.} and Williams, {D. A.} and Williams, {D. C.} and Williams, {S. H.} and S. Willocq and Wilson, {R. J.} and Wisniewski, {W. J.} and M. Woods and Word, {G. B.} and J. Wyss and Yamamoto, {R. K.} and Yamartino, {J. M.} and X. Yang and J. Yashima and Yellin, {S. J.} and Young, {C. C.} and H. Yuta and G. Zapalac and Zdarko, {R. W.} and J. Zhou",

year = "1997",

doi = "10.1103/PhysRevLett.78.4691",

language = "English",

volume = "78",

pages = "4691--4696",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "25",

}

TY - JOUR

T1 - Measurement of the τ neutrino helicity and michel parameters in polarized e+e− collisions

AU - Abe, K.

AU - Akagi, T.

AU - Allen, N. J.

AU - Ash, W. W.

AU - Aston, D.

AU - Baird, K. G.

AU - Baltay, C.

AU - Band, H. R.

AU - Barakat, M. B.

AU - Baranko, G.

AU - Bardon, O.

AU - Barklow, T. L.

AU - Bashindzhagyan, G. L.

AU - Bazarko, A. O.

AU - Ben-David, R.

AU - Benvenuti, A. C.

AU - Bilei, G. M.

AU - Bisello, D.

AU - Blaylock, G.

AU - Bogart, J. R.

AU - Bolen, B.

AU - Bolton, T.

AU - Bower, G. R.

AU - Brau, J. E.

AU - Breidenbach, M.

AU - Bugg, W. M.

AU - Burke, D.

AU - Burnett, T. H.

AU - Burrows, P. N.

AU - Busza, W.

AU - Calcaterra, A.

AU - Caldwell, D. O.

AU - Calloway, D.

AU - Camanzi, B.

AU - Carpinelli, M.

AU - Cassell, R.

AU - Castaldi, R.

AU - Castro, A.

AU - Cavalli-Sforza, M.

AU - Chou, A.

AU - Church, E.

AU - Cohn, H. O.

AU - Coller, J. A.

AU - Cook, V.

AU - Cotton, R.

AU - Cowan, R. F.

AU - Coyne, D. G.

AU - Crawford, G.

AU - D’oliveira, A.

AU - Damerell, C. J.S.

AU - Daoudi, M.

AU - De Sangro, R.

AU - Dell’orso, R.

AU - Dervan, P. J.

AU - Dima, M.

AU - Dong, D. N.

AU - Du, P. Y.C.

AU - Dubois, R.

AU - Eisenstein, B. I.

AU - Elia, R.

AU - Etzion, E.

AU - Fahey, S.

AU - Falciai, D.

AU - Fan, C.

AU - Fernandez, J. P.

AU - Fero, M. J.

AU - Frey, R.

AU - Furuno, K.

AU - Gillman, T.

AU - Gladding, G.

AU - Gonzalez, S.

AU - Hart, E. L.

AU - Harton, J. L.

AU - Hasan, A.

AU - Hasegawa, Y.

AU - Hasuko, K.

AU - Hedges, S. J.

AU - Hertzbach, S. S.

AU - Hildreth, M. D.

AU - Huber, J.

AU - Huffer, M. E.

AU - Hughes, E. W.

AU - Hwang, H.

AU - Iwasaki, Y.

AU - Jackson, D. J.

AU - Jacques, P.

AU - Jaros, J. A.

AU - Johnson, A. S.

AU - Johnson, J. R.

AU - Johnson, R. A.

AU - Junk, T.

AU - Kajikawa, R.

AU - Kalelkar, M.

AU - Kang, H. J.

AU - Karliner, I.

AU - Kawahara, H.

AU - Kendall, H. W.

AU - Kim, Y. D.

AU - King, M. E.

AU - King, R.

AU - Kofler, R. R.

AU - Krishna, N. M.

AU - Kroeger, R. S.

AU - Labs, J. F.

AU - Langston, M.

AU - Lath, A.

AU - Lauber, J. A.

AU - Leith, D. W.G.S.

AU - Lia, V.

AU - Liu, M. X.

AU - Liu, X.

AU - Loreti, M.

AU - Lu, A.

AU - Lynch, H. L.

AU - Ma, J.

AU - Mancinelli, G.

AU - Manly, S.

AU - Mantovani, G.

AU - Markiewicz, T. W.

AU - Maruyama, T.

AU - Masuda, H.

AU - Mazzucato, E.

AU - Mc Kemey, A. K.

AU - Meadows, B. T.

AU - Messner, R.

AU - Mockett, P. M.

AU - Moffeit, K. C.

AU - Moore, T. B.

AU - Muller, D.

AU - Nagamine, T.

AU - Narita, S.

AU - Nauenberg, U.

AU - Neal, H.

AU - Nussbaum, M.

AU - Ohnishi, Y.

AU - Osborne, L. S.

AU - Panvini, R. S.

AU - Park, C. H.

AU - Park, H.

AU - Pavel, T. J.

AU - Peruzzi, I.

AU - Piccolo, M.

AU - Piemontese, L.

AU - Pieroni, E.

AU - Pitts, K. T.

AU - Plano, R. J.

AU - Prepost, R.

AU - Prescott, C. Y.

AU - Punkar, G. D.

AU - Quigley, J.

AU - Ratcliff, B. N.

AU - Reeves, T. W.

AU - Reidy, J.

AU - Reinertsen, P. L.

AU - Rensing, P. E.

AU - Rochester, L. S.

AU - Rowson, P. C.

AU - Russell, J. J.

AU - Saxton, O. H.

AU - Schalk, T.

AU - Schindler, R. H.

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AU - Sen, S.

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AU - Shapiro, G.

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AU - Yashima, J.

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AU - Yuta, H.

AU - Zapalac, G.

AU - Zdarko, R. W.

AU - Zhou, J.

PY - 1997

Y1 - 1997

N2 - We present a new measurement of the τ neutrino helicity hντ and the τ Michel parameters ρ, η, ξ, and the product δξ. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the τ decay spectra, using the 1993-1995 SLD data sample of 4328 e+e−→Z0 → τ+ τ− events. From the decays τ →πντ and τ →ρντ we obtain a combined value hντ = −0.93±0.10±0.04. The leptonic decay channels yield combined values of ρ=0.72±0.09±0.03, ξ=1.05±0.35±0.04, and δξ=0.88±0.27±0.04.

AB - We present a new measurement of the τ neutrino helicity hντ and the τ Michel parameters ρ, η, ξ, and the product δξ. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the τ decay spectra, using the 1993-1995 SLD data sample of 4328 e+e−→Z0 → τ+ τ− events. From the decays τ →πντ and τ →ρντ we obtain a combined value hντ = −0.93±0.10±0.04. The leptonic decay channels yield combined values of ρ=0.72±0.09±0.03, ξ=1.05±0.35±0.04, and δξ=0.88±0.27±0.04.

UR - http://www.scopus.com/inward/record.url?scp=4243271002&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243271002&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.78.4691

DO - 10.1103/PhysRevLett.78.4691

M3 - Article

AN - SCOPUS:4243271002

VL - 78

SP - 4691

EP - 4696

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 25

ER -

Measurement of the τ neutrino helicity and michel parameters in polarized e⁺e⁻ collisions

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