Test of CP-invariance in e+e-→Z0→τ+τ- and a limit on the weak dipole moment of the τ lepton

P. D. Acton; G. Alexander; J. Allison; P. P. Allport; K. J. Anderson; S. Arcelli; P. Ashton; A. Astbury; D. Axen; G. Azuelos; G. A. Bahan; J. T.M. Baines; A. H. Ball; J. Banks; G. J. Barker; R. J. Barlow; J. R. Batley; G. Beaudoin; A. Beck; J. Becker; T. Behnke; K. W. Bell; G. Bella; P. Berlich; S. Bethke; U. Biebel; U. Binder; I. J. Bloodworth; P. Bock; B. Boden; H. M. Bosch; S. Bougerolle; B. B. Brabson; H. Breuker; R. M. Brown; R. Brun; A. Buijs; H. J. Burckhart; P. Capiluppi; R. K. Carnegie; A. A. Carter; J. R. Carter; C. Y. Chang; D. G. Charlton; P. E.L. Clarke; I. Cohen; W. J. Collins; J. E. Conboy; M. Cooper; M. Couch; M. Coupland; M. Cuffiani; S. Dado; G. M. Dallavalle; S. De Jong; P. Debu; L. A. del Pozo; M. M. Deninno; A. Dieckmann; M. Dittmar; M. S. Dixit; E. do Couto e Silva; E. Duchovni; G. Duckeck; I. P. Duerdoth; D. J.P. Dumas; P. A. Elcombe; P. G. Estabrooks; E. Etzion; H. G. Evans; F. Fabbri; M. Fincke-Keeler; H. M. Fischer; D. G. Fong; C. Fukunaga; A. Gaidot; O. Ganel; J. W. Gary; J. Gascon; R. F. McGowan; N. I. Geddes; C. Geich-Gimbel; S. W. Gensler; F. X. Gentit; G. Giacomelli; V. Gibson; W. R. Gibson; J. D. Gillies; J. Goldberg; M. J. Goodrick; W. Gorn; C. Grandi; F. C. Grant; J. Hagemann; G. G. Hanson; M. Hansroul; C. K. Hangrove; P. F. Harrison; J. Hart; P. M. Hattersley; M. Hauschild; C. M. Hawkes; E. Heflin; R. J. Hemingway; R. D. Heuer; J. C. Hill; S. J. Hillier; D. A. Hinshaw; C. Ho; J. D. Hobbs; P. R. Hobson; D. Hochman; R. J. Homer; A. K. Honma; S. R. Hou; C. P. Howarth; R. E. Hughes-Jones; R. Humbert; P. Igo-Kemenes; H. Ihssen; D. C. Imrie; A. C. Janissen; A. Jawahery; P. W. Jeffreys; H. Jeremie; M. Jimack; M. Jobes; R. W.L. Jones; P. Jovanovic; D. Karlen; K. Kawagoe; T. Kawamoto; R. K. Keeler; R. G. Kellogg; B. W. Kennedy; D. E. Klem; T. Kobayashi; T. P. Kokott; S. Komamiya; L. Köpke; J. F. Kral; R. Kowalewski; H. Kreutzmann; J. von Krogh; J. Kroll; M. Kuwano; P. Kyberd; G. D. Lafferty; F. Lamarche; W. J. Larson; J. G. Layter; P. Le Du; P. Leblanc; A. M. Lee; M. H. Lehto; D. Lellouch; P. Lennert; C. Leroy; J. Letts; S. Levegrün; L. Levinson; S. L. Lloyd; F. K. Loebinger; J. M. Lorah; B. Lorazo; M. J. Losty; X. C. Lou; J. Ludwig; M. Mannelli; S. Marcellini; G. Maringer; A. J. Martin; J. P. Martin; T. Mashimo; P. Mättig; U. Maur; J. McKenna; T. J. McMahon; J. R. McNutt; F. Meijers; D. Menszner; F. S. Merritt; H. Mes; A. Michelini; R. P. Middleton; G. Mikenberg; J. Mildenberger; D. J. Miller; R. Mir; W. Mohr; C. Moisan; A. Montanari; T. Mori; M. W. Moss; T. Mouthuy; B. Nellen; H. H. Nguyen; S. W. O'Neale; B. P. O'Neill; F. G. Oakham; F. Odorici; M. Ogg; H. O. Ogren; H. Oh; C. J. Oram; M. J. Oreglia; S. Orito; J. P. Pansart; B. Panzer-Steindel; P. Paschievici; G. N. Patrick; S. J. Pawley; P. Pfister; J. E. Pilcher; D. Pitman; D. E. Plane; P. Poffenberger; B. Poli; A. Pouladdej; E. Prebys; T. W. Pritchard; H. Przysiezniak; G. Quast; M. W. Redmond; D. L. Rees; K. Riles; S. A. Robins; D. Robinson; A. Rollnik; J. M. Roney; E. Ros; S. Rossberg; A. M. Rossi; M. Rosvick; P. Routenberg; K. Runge; O. Runolfsson; D. R. Rust; S. Sanghera; M. Sasaki; A. D. Schaile; O. Schaile; W. Schappert; P. Scharff-Hansen; P. Schenk; H. von der Schmitt; S. Schreiber; J. Schwiening; W. G. Scott; M. Settles; B. C. Shen; P. Sherwood; R. Shypit; A. Simon; P. Singh; G. P. Siroli; A. Skuja; A. M. Smith; T. J. Smith; G. A. Snow; R. Sobie; R. W. Springer; M. Sproston; K. Stephens; R. Ströhmer; D. Strom; H. Takeda; T. Takeshita; P. Taras; S. Tarem; P. Teixeira-Dias; N. J. Thackray; G. Transtromer; T. Tsukamoto; M. F. Turner; G. Tysarczyk-Niemeyer; D. Van den plas; R. Van Kooten; G. J. VanDalen; G. Vasseur; C. J. Virtue; A. Wagner; D. L. Wagner; C. Wahl; J. P. Walker; C. P. Ward; D. R. Ward; P. M. Watkins; A. T. Watson; N. K. Watson; M. Weber; P. Weber; S. Weisz; P. S. Wells; N. Wermes; M. A. Whalley; G. W. Wilson; J. A. Wilson; I. Wingerter; V. H. Winterer; T. Wlodek; N. C. Wood; S. Wotton; T. R. Wyatt; R. Yaari; Y. Yang; G. Yekutieli; M. Yurko; W. Zeuner; G. T. Zorn

doi:10.1016/0370-2693(92)91161-2

Test of CP-invariance in e⁺e^-→Z⁰→τ⁺τ^- and a limit on the weak dipole moment of the τ lepton

P. D. Acton^*, G. Alexander, J. Allison, P. P. Allport, K. J. Anderson, S. Arcelli, P. Ashton, A. Astbury, D. Axen, G. Azuelos, G. A. Bahan, J. T.M. Baines, A. H. Ball, J. Banks, G. J. Barker, R. J. Barlow, J. R. Batley, G. Beaudoin, A. Beck, J. BeckerT. Behnke, K. W. Bell, G. Bella, P. Berlich, S. Bethke, U. Biebel, U. Binder, I. J. Bloodworth, P. Bock, B. Boden, H. M. Bosch, S. Bougerolle, B. B. Brabson, H. Breuker, R. M. Brown, R. Brun, A. Buijs, H. J. Burckhart, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, P. E.L. Clarke, I. Cohen, W. J. Collins, J. E. Conboy, M. Cooper, M. Couch, M. Coupland, M. Cuffiani, S. Dado, G. M. Dallavalle, S. De Jong, P. Debu, L. A. del Pozo, M. M. Deninno, A. Dieckmann, M. Dittmar, M. S. Dixit, E. do Couto e Silva, E. Duchovni, G. Duckeck, I. P. Duerdoth, D. J.P. Dumas, P. A. Elcombe, P. G. Estabrooks, E. Etzion, H. G. Evans, F. Fabbri, M. Fincke-Keeler, H. M. Fischer, D. G. Fong, C. Fukunaga, A. Gaidot, O. Ganel, J. W. Gary, J. Gascon, R. F. McGowan, N. I. Geddes, C. Geich-Gimbel, S. W. Gensler, F. X. Gentit, G. Giacomelli, V. Gibson, W. R. Gibson, J. D. Gillies, J. Goldberg, M. J. Goodrick, W. Gorn, C. Grandi, F. C. Grant, J. Hagemann, G. G. Hanson, M. Hansroul, C. K. Hangrove, P. F. Harrison, J. Hart, P. M. Hattersley, M. Hauschild, C. M. Hawkes, E. Heflin, R. J. Hemingway, R. D. Heuer, J. C. Hill, S. J. Hillier, D. A. Hinshaw, C. Ho, J. D. Hobbs, P. R. Hobson, D. Hochman, R. J. Homer, A. K. Honma, S. R. Hou, C. P. Howarth, R. E. Hughes-Jones, R. Humbert, P. Igo-Kemenes, H. Ihssen, D. C. Imrie, A. C. Janissen, A. Jawahery, P. W. Jeffreys, H. Jeremie, M. Jimack, M. Jobes, R. W.L. Jones, P. Jovanovic, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, D. E. Klem, T. Kobayashi, T. P. Kokott, S. Komamiya, L. Köpke, J. F. Kral, R. Kowalewski, H. Kreutzmann, J. von Krogh, J. Kroll, M. Kuwano, P. Kyberd, G. D. Lafferty, F. Lamarche, W. J. Larson, J. G. Layter, P. Le Du, P. Leblanc, A. M. Lee, M. H. Lehto, D. Lellouch, P. Lennert, C. Leroy, J. Letts, S. Levegrün, L. Levinson, S. L. Lloyd, F. K. Loebinger, J. M. Lorah, B. Lorazo, M. J. Losty, X. C. Lou, J. Ludwig, M. Mannelli, S. Marcellini, G. Maringer, A. J. Martin, J. P. Martin, T. Mashimo, P. Mättig, U. Maur, J. McKenna, T. J. McMahon, J. R. McNutt, F. Meijers, D. Menszner, F. S. Merritt, H. Mes, A. Michelini, R. P. Middleton, G. Mikenberg, J. Mildenberger, D. J. Miller, R. Mir, W. Mohr, C. Moisan, A. Montanari, T. Mori, M. W. Moss, T. Mouthuy, B. Nellen, H. H. Nguyen, S. W. O'Neale, B. P. O'Neill, F. G. Oakham, F. Odorici, M. Ogg, H. O. Ogren, H. Oh, C. J. Oram, M. J. Oreglia, S. Orito, J. P. Pansart, B. Panzer-Steindel, P. Paschievici, G. N. Patrick, S. J. Pawley, P. Pfister, J. E. Pilcher, D. Pitman, D. E. Plane, P. Poffenberger, B. Poli, A. Pouladdej, E. Prebys, T. W. Pritchard, H. Przysiezniak, G. Quast, M. W. Redmond, D. L. Rees, K. Riles, S. A. Robins, D. Robinson, A. Rollnik, J. M. Roney, E. Ros, S. Rossberg, A. M. Rossi, M. Rosvick, P. Routenberg, K. Runge, O. Runolfsson, D. R. Rust, S. Sanghera, M. Sasaki, A. D. Schaile, O. Schaile, W. Schappert, P. Scharff-Hansen, P. Schenk, H. von der Schmitt, S. Schreiber, J. Schwiening, W. G. Scott, M. Settles, B. C. Shen, P. Sherwood, R. Shypit, A. Simon, P. Singh, G. P. Siroli, A. Skuja, A. M. Smith, T. J. Smith, G. A. Snow, R. Sobie, R. W. Springer, M. Sproston, K. Stephens, R. Ströhmer, D. Strom, H. Takeda, T. Takeshita, P. Taras, S. Tarem, P. Teixeira-Dias, N. J. Thackray, G. Transtromer, T. Tsukamoto, M. F. Turner, G. Tysarczyk-Niemeyer, D. Van den plas, R. Van Kooten, G. J. VanDalen, G. Vasseur, C. J. Virtue, A. Wagner, D. L. Wagner, C. Wahl, J. P. Walker, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, M. Weber, P. Weber, S. Weisz, P. S. Wells, N. Wermes, M. A. Whalley, G. W. Wilson, J. A. Wilson, I. Wingerter, V. H. Winterer, T. Wlodek, N. C. Wood, S. Wotton, T. R. Wyatt, R. Yaari, Y. Yang, G. Yekutieli, M. Yurko, W. Zeuner, G. T. Zorn

^*Corresponding author for this work

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

55 Citations (Scopus)

Abstract

Using a sample of 5558 Z⁰ → τ⁺τ^- decays produced at LEP a direct test of CP-invariance in the neutral current reaction e⁺e^- → τ⁺τ^- is performed. Samples of events where eachy τ decays into a single particle have been isolated for the construction of CP-odd observables. Three different event classes are considered: lepton-lepton, lepton-hadron, and hadron-hadron. No evidence for a non-zero expectation value of the considered CP-observables and hence for CP-violation is observed. Quantitatively, we deduce from this null result an estimate on the weak dipole moment d ̃_τ(m² _Z = (-4.5 ± 5.3 ± 1.4) × 10^-17 e cm for the lepton-lepton signature and d ̃_τ(m² _Z = (1.4 ± 3.7 ± 1.3) × 10^-17 e cm for the hadron-hadron signature. Combining these results we place a limit with 95% confidence of | d ̃_τ|≤7.0 × 10^-17 e cm.

Original language	English
Pages (from-to)	405-415
Number of pages	11
Journal	Physics Letters B
Volume	281
Issue number	3-4
DOIs	https://doi.org/10.1016/0370-2693(92)91161-2
Publication status	Published - 1992 May 14
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/0370-2693(92)91161-2

Cite this

Acton, P. D., Alexander, G., Allison, J., Allport, P. P., Anderson, K. J., Arcelli, S., Ashton, P., Astbury, A., Axen, D., Azuelos, G., Bahan, G. A., Baines, J. T. M., Ball, A. H., Banks, J., Barker, G. J., Barlow, R. J., Batley, J. R., Beaudoin, G., Beck, A., ... Zorn, G. T. (1992). Test of CP-invariance in e⁺e^-→Z⁰→τ⁺τ^- and a limit on the weak dipole moment of the τ lepton. Physics Letters B, 281(3-4), 405-415. https://doi.org/10.1016/0370-2693(92)91161-2

Acton, PD, Alexander, G, Allison, J, Allport, PP, Anderson, KJ, Arcelli, S, Ashton, P, Astbury, A, Axen, D, Azuelos, G, Bahan, GA, Baines, JTM, Ball, AH, Banks, J, Barker, GJ, Barlow, RJ, Batley, JR, Beaudoin, G, Beck, A, Becker, J, Behnke, T, Bell, KW, Bella, G, Berlich, P, Bethke, S, Biebel, U, Binder, U, Bloodworth, IJ, Bock, P, Boden, B, Bosch, HM, Bougerolle, S, Brabson, BB, Breuker, H, Brown, RM, Brun, R, Buijs, A, Burckhart, HJ, Capiluppi, P, Carnegie, RK, Carter, AA, Carter, JR, Chang, CY, Charlton, DG, Clarke, PEL, Cohen, I, Collins, WJ, Conboy, JE, Cooper, M, Couch, M, Coupland, M, Cuffiani, M, Dado, S, Dallavalle, GM, De Jong, S, Debu, P, del Pozo, LA, Deninno, MM, Dieckmann, A, Dittmar, M, Dixit, MS, do Couto e Silva, E, Duchovni, E, Duckeck, G, Duerdoth, IP, Dumas, DJP, Elcombe, PA, Estabrooks, PG, Etzion, E, Evans, HG, Fabbri, F, Fincke-Keeler, M, Fischer, HM, Fong, DG, Fukunaga, C, Gaidot, A, Ganel, O, Gary, JW, Gascon, J, McGowan, RF, Geddes, NI, Geich-Gimbel, C, Gensler, SW, Gentit, FX, Giacomelli, G, Gibson, V, Gibson, WR, Gillies, JD, Goldberg, J, Goodrick, MJ, Gorn, W, Grandi, C, Grant, FC, Hagemann, J, Hanson, GG, Hansroul, M, Hangrove, CK, Harrison, PF, Hart, J, Hattersley, PM, Hauschild, M, Hawkes, CM, Heflin, E, Hemingway, RJ, Heuer, RD, Hill, JC, Hillier, SJ, Hinshaw, DA, Ho, C, Hobbs, JD, Hobson, PR, Hochman, D, Homer, RJ, Honma, AK, Hou, SR, Howarth, CP, Hughes-Jones, RE, Humbert, R, Igo-Kemenes, P, Ihssen, H, Imrie, DC, Janissen, AC, Jawahery, A, Jeffreys, PW, Jeremie, H, Jimack, M, Jobes, M, Jones, RWL, Jovanovic, P, Karlen, D, Kawagoe, K, Kawamoto, T, Keeler, RK, Kellogg, RG, Kennedy, BW, Klem, DE, Kobayashi, T, Kokott, TP, Komamiya, S, Köpke, L, Kral, JF, Kowalewski, R, Kreutzmann, H, von Krogh, J, Kroll, J, Kuwano, M, Kyberd, P, Lafferty, GD, Lamarche, F, Larson, WJ, Layter, JG, Le Du, P, Leblanc, P, Lee, AM, Lehto, MH, Lellouch, D, Lennert, P, Leroy, C, Letts, J, Levegrün, S, Levinson, L, Lloyd, SL, Loebinger, FK, Lorah, JM, Lorazo, B, Losty, MJ, Lou, XC, Ludwig, J, Mannelli, M, Marcellini, S, Maringer, G, Martin, AJ, Martin, JP, Mashimo, T, Mättig, P, Maur, U, McKenna, J, McMahon, TJ, McNutt, JR, Meijers, F, Menszner, D, Merritt, FS, Mes, H, Michelini, A, Middleton, RP, Mikenberg, G, Mildenberger, J, Miller, DJ, Mir, R, Mohr, W, Moisan, C, Montanari, A, Mori, T, Moss, MW, Mouthuy, T, Nellen, B, Nguyen, HH, O'Neale, SW, O'Neill, BP, Oakham, FG, Odorici, F, Ogg, M, Ogren, HO, Oh, H, Oram, CJ, Oreglia, MJ, Orito, S, Pansart, JP, Panzer-Steindel, B, Paschievici, P, Patrick, GN, Pawley, SJ, Pfister, P, Pilcher, JE, Pitman, D, Plane, DE, Poffenberger, P, Poli, B, Pouladdej, A, Prebys, E, Pritchard, TW, Przysiezniak, H, Quast, G, Redmond, MW, Rees, DL, Riles, K, Robins, SA, Robinson, D, Rollnik, A, Roney, JM, Ros, E, Rossberg, S, Rossi, AM, Rosvick, M, Routenberg, P, Runge, K, Runolfsson, O, Rust, DR, Sanghera, S, Sasaki, M, Schaile, AD, Schaile, O, Schappert, W, Scharff-Hansen, P, Schenk, P, von der Schmitt, H, Schreiber, S, Schwiening, J, Scott, WG, Settles, M, Shen, BC, Sherwood, P, Shypit, R, Simon, A, Singh, P, Siroli, GP, Skuja, A, Smith, AM, Smith, TJ, Snow, GA, Sobie, R, Springer, RW, Sproston, M, Stephens, K, Ströhmer, R, Strom, D, Takeda, H, Takeshita, T, Taras, P, Tarem, S, Teixeira-Dias, P, Thackray, NJ, Transtromer, G, Tsukamoto, T, Turner, MF, Tysarczyk-Niemeyer, G, Van den plas, D, Van Kooten, R, VanDalen, GJ, Vasseur, G, Virtue, CJ, Wagner, A, Wagner, DL, Wahl, C, Walker, JP, Ward, CP, Ward, DR, Watkins, PM, Watson, AT, Watson, NK, Weber, M, Weber, P, Weisz, S, Wells, PS, Wermes, N, Whalley, MA, Wilson, GW, Wilson, JA, Wingerter, I, Winterer, VH, Wlodek, T, Wood, NC, Wotton, S, Wyatt, TR, Yaari, R, Yang, Y, Yekutieli, G, Yurko, M, Zeuner, W & Zorn, GT 1992, 'Test of CP-invariance in e⁺e^-→Z⁰→τ⁺τ^- and a limit on the weak dipole moment of the τ lepton', Physics Letters B, vol. 281, no. 3-4, pp. 405-415. https://doi.org/10.1016/0370-2693(92)91161-2

@article{450e117a5da846a095a55bac3cc24fc7,

title = "Test of CP-invariance in e+e-→Z0→τ+τ- and a limit on the weak dipole moment of the τ lepton",

abstract = "Using a sample of 5558 Z0 → τ+τ- decays produced at LEP a direct test of CP-invariance in the neutral current reaction e+e- → τ+τ- is performed. Samples of events where eachy τ decays into a single particle have been isolated for the construction of CP-odd observables. Three different event classes are considered: lepton-lepton, lepton-hadron, and hadron-hadron. No evidence for a non-zero expectation value of the considered CP-observables and hence for CP-violation is observed. Quantitatively, we deduce from this null result an estimate on the weak dipole moment d{\~ }τ(m2 Z = (-4.5 ± 5.3 ± 1.4) × 10-17 e cm for the lepton-lepton signature and d{\~ }τ(m2 Z = (1.4 ± 3.7 ± 1.3) × 10-17 e cm for the hadron-hadron signature. Combining these results we place a limit with 95% confidence of | d{\~ }τ|≤7.0 × 10-17 e cm.",

author = "Acton, {P. D.} and G. Alexander and J. Allison and Allport, {P. P.} and Anderson, {K. J.} and S. Arcelli and P. Ashton and A. Astbury and D. Axen and G. Azuelos and Bahan, {G. A.} and Baines, {J. T.M.} and Ball, {A. H.} and J. Banks and Barker, {G. J.} and Barlow, {R. J.} and Batley, {J. R.} and G. Beaudoin and A. Beck and J. Becker and T. Behnke and Bell, {K. W.} and G. Bella and P. Berlich and S. Bethke and U. Biebel and U. Binder and Bloodworth, {I. J.} and P. Bock and B. Boden and Bosch, {H. M.} and S. Bougerolle and Brabson, {B. B.} and H. Breuker and Brown, {R. M.} and R. Brun and A. Buijs and Burckhart, {H. J.} and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and Clarke, {P. E.L.} and I. Cohen and Collins, {W. J.} and Conboy, {J. E.} and M. Cooper and M. Couch and M. Coupland and M. Cuffiani and S. Dado and Dallavalle, {G. M.} and {De Jong}, S. and P. Debu and {del Pozo}, {L. A.} and Deninno, {M. M.} and A. Dieckmann and M. Dittmar and Dixit, {M. S.} and {do Couto e Silva}, E. and E. Duchovni and G. Duckeck and Duerdoth, {I. P.} and Dumas, {D. J.P.} and Elcombe, {P. A.} and Estabrooks, {P. G.} and E. Etzion and Evans, {H. G.} and F. Fabbri and M. Fincke-Keeler and Fischer, {H. M.} and Fong, {D. G.} and C. Fukunaga and A. Gaidot and O. Ganel and Gary, {J. W.} and J. Gascon and McGowan, {R. F.} and Geddes, {N. I.} and C. Geich-Gimbel and Gensler, {S. W.} and Gentit, {F. X.} and G. Giacomelli and V. Gibson and Gibson, {W. R.} and Gillies, {J. D.} and J. Goldberg and Goodrick, {M. J.} and W. Gorn and C. Grandi and Grant, {F. C.} and J. Hagemann and Hanson, {G. G.} and M. Hansroul and Hangrove, {C. K.} and Harrison, {P. F.} and J. Hart and Hattersley, {P. M.} and M. Hauschild and Hawkes, {C. M.} and E. Heflin and Hemingway, {R. J.} and Heuer, {R. D.} and Hill, {J. C.} and Hillier, {S. J.} and Hinshaw, {D. A.} and C. Ho and Hobbs, {J. D.} and Hobson, {P. R.} and D. Hochman and Homer, {R. J.} and Honma, {A. K.} and Hou, {S. R.} and Howarth, {C. P.} and Hughes-Jones, {R. E.} and R. Humbert and P. Igo-Kemenes and H. Ihssen and Imrie, {D. C.} and Janissen, {A. C.} and A. Jawahery and Jeffreys, {P. W.} and H. Jeremie and M. Jimack and M. Jobes and Jones, {R. W.L.} and P. Jovanovic and D. Karlen and K. Kawagoe and T. Kawamoto and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and Klem, {D. E.} and T. Kobayashi and Kokott, {T. P.} and S. Komamiya and L. K{\"o}pke and Kral, {J. F.} and R. Kowalewski and H. Kreutzmann and {von Krogh}, J. and J. Kroll and M. Kuwano and P. Kyberd and Lafferty, {G. D.} and F. Lamarche and Larson, {W. J.} and Layter, {J. G.} and {Le Du}, P. and P. Leblanc and Lee, {A. M.} and Lehto, {M. H.} and D. Lellouch and P. Lennert and C. Leroy and J. Letts and S. Levegr{\"u}n and L. Levinson and Lloyd, {S. L.} and Loebinger, {F. K.} and Lorah, {J. M.} and B. Lorazo and Losty, {M. J.} and Lou, {X. C.} and J. Ludwig and M. Mannelli and S. Marcellini and G. Maringer and Martin, {A. J.} and Martin, {J. P.} and T. Mashimo and P. M{\"a}ttig and U. Maur and J. McKenna and McMahon, {T. J.} and McNutt, {J. R.} and F. Meijers and D. Menszner and Merritt, {F. S.} and H. Mes and A. Michelini and Middleton, {R. P.} and G. Mikenberg and J. Mildenberger and Miller, {D. J.} and R. Mir and W. Mohr and C. Moisan and A. Montanari and T. Mori and Moss, {M. W.} and T. Mouthuy and B. Nellen and Nguyen, {H. H.} and O'Neale, {S. W.} and O'Neill, {B. P.} and Oakham, {F. G.} and F. Odorici and M. Ogg and Ogren, {H. O.} and H. Oh and Oram, {C. J.} and Oreglia, {M. J.} and S. Orito and Pansart, {J. P.} and B. Panzer-Steindel and P. Paschievici and Patrick, {G. N.} and Pawley, {S. J.} and P. Pfister and Pilcher, {J. E.} and D. Pitman and Plane, {D. E.} and P. Poffenberger and B. Poli and A. Pouladdej and E. Prebys and Pritchard, {T. W.} and H. Przysiezniak and G. Quast and Redmond, {M. W.} and Rees, {D. L.} and K. Riles and Robins, {S. A.} and D. Robinson and A. Rollnik and Roney, {J. M.} and E. Ros and S. Rossberg and Rossi, {A. M.} and M. Rosvick and P. Routenberg and K. Runge and O. Runolfsson and Rust, {D. R.} and S. Sanghera and M. Sasaki and Schaile, {A. D.} and O. Schaile and W. Schappert and P. Scharff-Hansen and P. Schenk and {von der Schmitt}, H. and S. Schreiber and J. Schwiening and Scott, {W. G.} and M. Settles and Shen, {B. C.} and P. Sherwood and R. Shypit and A. Simon and P. Singh and Siroli, {G. P.} and A. Skuja and Smith, {A. M.} and Smith, {T. J.} and Snow, {G. A.} and R. Sobie and Springer, {R. W.} and M. Sproston and K. Stephens and R. Str{\"o}hmer and D. Strom and H. Takeda and T. Takeshita and P. Taras and S. Tarem and P. Teixeira-Dias and Thackray, {N. J.} and G. Transtromer and T. Tsukamoto and Turner, {M. F.} and G. Tysarczyk-Niemeyer and {Van den plas}, D. and {Van Kooten}, R. and VanDalen, {G. J.} and G. Vasseur and Virtue, {C. J.} and A. Wagner and Wagner, {D. L.} and C. Wahl and Walker, {J. P.} and Ward, {C. P.} and Ward, {D. R.} and Watkins, {P. M.} and Watson, {A. T.} and Watson, {N. K.} and M. Weber and P. Weber and S. Weisz and Wells, {P. S.} and N. Wermes and Whalley, {M. A.} and Wilson, {G. W.} and Wilson, {J. A.} and I. Wingerter and Winterer, {V. H.} and T. Wlodek and Wood, {N. C.} and S. Wotton and Wyatt, {T. R.} and R. Yaari and Y. Yang and G. Yekutieli and M. Yurko and W. Zeuner and Zorn, {G. T.}",

note = "Funding Information: We would like to acknowledge the continuous interest of W. Bernreuther and O. Naehtmann in this work. We would like to thank them, P. Overmann, and G.W. Botz for many stimulating discussions and the development of the Monte Carlo generator. We would also like to thank M. Wunsch and T. Fischer for helpful suggestions and discussions. It is a pleasure to thank the SL Division for the efficient operation of the LEP accelerator, the precisc information on the absolute energy, and their continuing close cooperation with our experimental group. In addition to the support staff at our own institutions we are pleased to acknowledge thc Department of Energy, USA, National Science Foundation, USA, Science and Engineering Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israeli Ministry of Science, Minerva Gesellschaft, Japanese Ministry, of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Scicnce Research Program, American Israeli Bi-national Science Foundation, Direction des Sciences dc la Mati~re du Commissariat l'Encrgie Atomique, France, Bundesministerium for Forschung und Technologie, FRG, A.P. Sloan Foundation, and Junta Nacional de lnvcstigaqfio Cient~fica e Tec-nol6gica, Portugal.",

year = "1992",

month = may,

day = "14",

doi = "10.1016/0370-2693(92)91161-2",

language = "English",

volume = "281",

pages = "405--415",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "3-4",

}

TY - JOUR

T1 - Test of CP-invariance in e+e-→Z0→τ+τ- and a limit on the weak dipole moment of the τ lepton

AU - Acton, P. D.

AU - Alexander, G.

AU - Allison, J.

AU - Allport, P. P.

AU - Anderson, K. J.

AU - Arcelli, S.

AU - Ashton, P.

AU - Astbury, A.

AU - Axen, D.

AU - Azuelos, G.

AU - Bahan, G. A.

AU - Baines, J. T.M.

AU - Ball, A. H.

AU - Banks, J.

AU - Barker, G. J.

AU - Barlow, R. J.

AU - Batley, J. R.

AU - Beaudoin, G.

AU - Beck, A.

AU - Becker, J.

AU - Behnke, T.

AU - Bell, K. W.

AU - Bella, G.

AU - Berlich, P.

AU - Bethke, S.

AU - Biebel, U.

AU - Binder, U.

AU - Bloodworth, I. J.

AU - Bock, P.

AU - Boden, B.

AU - Bosch, H. M.

AU - Bougerolle, S.

AU - Brabson, B. B.

AU - Breuker, H.

AU - Brown, R. M.

AU - Brun, R.

AU - Buijs, A.

AU - Burckhart, H. J.

AU - Capiluppi, P.

AU - Carnegie, R. K.

AU - Carter, A. A.

AU - Carter, J. R.

AU - Chang, C. Y.

AU - Charlton, D. G.

AU - Clarke, P. E.L.

AU - Cohen, I.

AU - Collins, W. J.

AU - Conboy, J. E.

AU - Cooper, M.

AU - Couch, M.

AU - Coupland, M.

AU - Cuffiani, M.

AU - Dado, S.

AU - Dallavalle, G. M.

AU - De Jong, S.

AU - Debu, P.

AU - del Pozo, L. A.

AU - Deninno, M. M.

AU - Dieckmann, A.

AU - Dittmar, M.

AU - Dixit, M. S.

AU - do Couto e Silva, E.

AU - Duchovni, E.

AU - Duckeck, G.

AU - Duerdoth, I. P.

AU - Dumas, D. J.P.

AU - Elcombe, P. A.

AU - Estabrooks, P. G.

AU - Etzion, E.

AU - Evans, H. G.

AU - Fabbri, F.

AU - Fincke-Keeler, M.

AU - Fischer, H. M.

AU - Fong, D. G.

AU - Fukunaga, C.

AU - Gaidot, A.

AU - Ganel, O.

AU - Gary, J. W.

AU - Gascon, J.

AU - McGowan, R. F.

AU - Geddes, N. I.

AU - Geich-Gimbel, C.

AU - Gensler, S. W.

AU - Gentit, F. X.

AU - Giacomelli, G.

AU - Gibson, V.

AU - Gibson, W. R.

AU - Gillies, J. D.

AU - Goldberg, J.

AU - Goodrick, M. J.

AU - Gorn, W.

AU - Grandi, C.

AU - Grant, F. C.

AU - Hagemann, J.

AU - Hanson, G. G.

AU - Hansroul, M.

AU - Hangrove, C. K.

AU - Harrison, P. F.

AU - Hart, J.

AU - Hattersley, P. M.

AU - Hauschild, M.

AU - Hawkes, C. M.

AU - Heflin, E.

AU - Hemingway, R. J.

AU - Heuer, R. D.

AU - Hill, J. C.

AU - Hillier, S. J.

AU - Hinshaw, D. A.

AU - Ho, C.

AU - Hobbs, J. D.

AU - Hobson, P. R.

AU - Hochman, D.

AU - Homer, R. J.

AU - Honma, A. K.

AU - Hou, S. R.

AU - Howarth, C. P.

AU - Hughes-Jones, R. E.

AU - Humbert, R.

AU - Igo-Kemenes, P.

AU - Ihssen, H.

AU - Imrie, D. C.

AU - Janissen, A. C.

AU - Jawahery, A.

AU - Jeffreys, P. W.

AU - Jeremie, H.

AU - Jimack, M.

AU - Jobes, M.

AU - Jones, R. W.L.

AU - Jovanovic, P.

AU - Karlen, D.

AU - Kawagoe, K.

AU - Kawamoto, T.

AU - Keeler, R. K.

AU - Kellogg, R. G.

AU - Kennedy, B. W.

AU - Klem, D. E.

AU - Kobayashi, T.

AU - Kokott, T. P.

AU - Komamiya, S.

AU - Köpke, L.

AU - Kral, J. F.

AU - Kowalewski, R.

AU - Kreutzmann, H.

AU - von Krogh, J.

AU - Kroll, J.

AU - Kuwano, M.

AU - Kyberd, P.

AU - Lafferty, G. D.

AU - Lamarche, F.

AU - Larson, W. J.

AU - Layter, J. G.

AU - Le Du, P.

AU - Leblanc, P.

AU - Lee, A. M.

AU - Lehto, M. H.

AU - Lellouch, D.

AU - Lennert, P.

AU - Leroy, C.

AU - Letts, J.

AU - Levegrün, S.

AU - Levinson, L.

AU - Lloyd, S. L.

AU - Loebinger, F. K.

AU - Lorah, J. M.

AU - Lorazo, B.

AU - Losty, M. J.

AU - Lou, X. C.

AU - Ludwig, J.

AU - Mannelli, M.

AU - Marcellini, S.

AU - Maringer, G.

AU - Martin, A. J.

AU - Martin, J. P.

AU - Mashimo, T.

AU - Mättig, P.

AU - Maur, U.

AU - McKenna, J.

AU - McMahon, T. J.

AU - McNutt, J. R.

AU - Meijers, F.

AU - Menszner, D.

AU - Merritt, F. S.

AU - Mes, H.

AU - Michelini, A.

AU - Middleton, R. P.

AU - Mikenberg, G.

AU - Mildenberger, J.

AU - Miller, D. J.

AU - Mir, R.

AU - Mohr, W.

AU - Moisan, C.

AU - Montanari, A.

AU - Mori, T.

AU - Moss, M. W.

AU - Mouthuy, T.

AU - Nellen, B.

AU - Nguyen, H. H.

AU - O'Neale, S. W.

AU - O'Neill, B. P.

AU - Oakham, F. G.

AU - Odorici, F.

AU - Ogg, M.

AU - Ogren, H. O.

AU - Oh, H.

AU - Oram, C. J.

AU - Oreglia, M. J.

AU - Orito, S.

AU - Pansart, J. P.

AU - Panzer-Steindel, B.

AU - Paschievici, P.

AU - Patrick, G. N.

AU - Pawley, S. J.

AU - Pfister, P.

AU - Pilcher, J. E.

AU - Pitman, D.

AU - Plane, D. E.

AU - Poffenberger, P.

AU - Poli, B.

AU - Pouladdej, A.

AU - Prebys, E.

AU - Pritchard, T. W.

AU - Przysiezniak, H.

AU - Quast, G.

AU - Redmond, M. W.

AU - Rees, D. L.

AU - Riles, K.

AU - Robins, S. A.

AU - Robinson, D.

AU - Rollnik, A.

AU - Roney, J. M.

AU - Ros, E.

AU - Rossberg, S.

AU - Rossi, A. M.

AU - Rosvick, M.

AU - Routenberg, P.

AU - Runge, K.

AU - Runolfsson, O.

AU - Rust, D. R.

AU - Sanghera, S.

AU - Sasaki, M.

AU - Schaile, A. D.

AU - Schaile, O.

AU - Schappert, W.

AU - Scharff-Hansen, P.

AU - Schenk, P.

AU - von der Schmitt, H.

AU - Schreiber, S.

AU - Schwiening, J.

AU - Scott, W. G.

AU - Settles, M.

AU - Shen, B. C.

AU - Sherwood, P.

AU - Shypit, R.

AU - Simon, A.

AU - Singh, P.

AU - Siroli, G. P.

AU - Skuja, A.

AU - Smith, A. M.

AU - Smith, T. J.

AU - Snow, G. A.

AU - Sobie, R.

AU - Springer, R. W.

AU - Sproston, M.

AU - Stephens, K.

AU - Ströhmer, R.

AU - Strom, D.

AU - Takeda, H.

AU - Takeshita, T.

AU - Taras, P.

AU - Tarem, S.

AU - Teixeira-Dias, P.

AU - Thackray, N. J.

AU - Transtromer, G.

AU - Tsukamoto, T.

AU - Turner, M. F.

AU - Tysarczyk-Niemeyer, G.

AU - Van den plas, D.

AU - Van Kooten, R.

AU - VanDalen, G. J.

AU - Vasseur, G.

AU - Virtue, C. J.

AU - Wagner, A.

AU - Wagner, D. L.

AU - Wahl, C.

AU - Walker, J. P.

AU - Ward, C. P.

AU - Ward, D. R.

AU - Watkins, P. M.

AU - Watson, A. T.

AU - Watson, N. K.

AU - Weber, M.

AU - Weber, P.

AU - Weisz, S.

AU - Wells, P. S.

AU - Wermes, N.

AU - Whalley, M. A.

AU - Wilson, G. W.

AU - Wilson, J. A.

AU - Wingerter, I.

AU - Winterer, V. H.

AU - Wlodek, T.

AU - Wood, N. C.

AU - Wotton, S.

AU - Wyatt, T. R.

AU - Yaari, R.

AU - Yang, Y.

AU - Yekutieli, G.

AU - Yurko, M.

AU - Zeuner, W.

AU - Zorn, G. T.

N1 - Funding Information: We would like to acknowledge the continuous interest of W. Bernreuther and O. Naehtmann in this work. We would like to thank them, P. Overmann, and G.W. Botz for many stimulating discussions and the development of the Monte Carlo generator. We would also like to thank M. Wunsch and T. Fischer for helpful suggestions and discussions. It is a pleasure to thank the SL Division for the efficient operation of the LEP accelerator, the precisc information on the absolute energy, and their continuing close cooperation with our experimental group. In addition to the support staff at our own institutions we are pleased to acknowledge thc Department of Energy, USA, National Science Foundation, USA, Science and Engineering Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israeli Ministry of Science, Minerva Gesellschaft, Japanese Ministry, of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Scicnce Research Program, American Israeli Bi-national Science Foundation, Direction des Sciences dc la Mati~re du Commissariat l'Encrgie Atomique, France, Bundesministerium for Forschung und Technologie, FRG, A.P. Sloan Foundation, and Junta Nacional de lnvcstigaqfio Cient~fica e Tec-nol6gica, Portugal.

PY - 1992/5/14

Y1 - 1992/5/14

N2 - Using a sample of 5558 Z0 → τ+τ- decays produced at LEP a direct test of CP-invariance in the neutral current reaction e+e- → τ+τ- is performed. Samples of events where eachy τ decays into a single particle have been isolated for the construction of CP-odd observables. Three different event classes are considered: lepton-lepton, lepton-hadron, and hadron-hadron. No evidence for a non-zero expectation value of the considered CP-observables and hence for CP-violation is observed. Quantitatively, we deduce from this null result an estimate on the weak dipole moment d ̃τ(m2 Z = (-4.5 ± 5.3 ± 1.4) × 10-17 e cm for the lepton-lepton signature and d ̃τ(m2 Z = (1.4 ± 3.7 ± 1.3) × 10-17 e cm for the hadron-hadron signature. Combining these results we place a limit with 95% confidence of | d ̃τ|≤7.0 × 10-17 e cm.

AB - Using a sample of 5558 Z0 → τ+τ- decays produced at LEP a direct test of CP-invariance in the neutral current reaction e+e- → τ+τ- is performed. Samples of events where eachy τ decays into a single particle have been isolated for the construction of CP-odd observables. Three different event classes are considered: lepton-lepton, lepton-hadron, and hadron-hadron. No evidence for a non-zero expectation value of the considered CP-observables and hence for CP-violation is observed. Quantitatively, we deduce from this null result an estimate on the weak dipole moment d ̃τ(m2 Z = (-4.5 ± 5.3 ± 1.4) × 10-17 e cm for the lepton-lepton signature and d ̃τ(m2 Z = (1.4 ± 3.7 ± 1.3) × 10-17 e cm for the hadron-hadron signature. Combining these results we place a limit with 95% confidence of | d ̃τ|≤7.0 × 10-17 e cm.

UR - http://www.scopus.com/inward/record.url?scp=0039029544&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0039029544&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(92)91161-2

DO - 10.1016/0370-2693(92)91161-2

M3 - Article

AN - SCOPUS:0039029544

SN - 0370-2693

VL - 281

SP - 405

EP - 415

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3-4

ER -

Test of CP-invariance in e⁺e^-→Z⁰→τ⁺τ^- and a limit on the weak dipole moment of the τ lepton

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