Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity

D. M. Asner, A. Eppich, J. Gronberg, T. S. Hill, D. J. Lange, R. J. Morrison, H. N. Nelson, T. K. Nelson, D. Roberts, B. H. Behrens, W. T. Ford, A. Gritsan, H. Krieg, J. Roy, J. G. Smith, J. P. Alexander, R. Baker, C. Bebek, B. E. Berger, K. BerkelmanV. Boisvert, D. G. Cassel, D. S. Crowcroft, M. Dickson, S. Von Dombrowski, P. S. Drell, K. M. Ecklund, R. Ehrlich, A. D. Foland, P. Gaidarev, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, P. I. Hopman, D. L. Kreinick, T. Lee, Y. Liu, T. O. Meyer, N. B. Mistry, C. R. Ng, E. Nordberg, M. Ogg, J. R. Patterson, D. Peterson, D. Riley, A. Soffer, J. G. Thayer, P. G. Thies, B. Valant-Spaight, A. Warburton, C. Ward, M. Athanas, P. Avery, C. D. Jones, M. Lohner, C. Prescot, A. I. Rubiera, J. Yelton, J. Zheng, G. Brandenburg, R. A. Briere, A. Ershov, Y. S. Gao, D. Y.J. Kim, R. Wilson, T. E. Browder, Y. Li, J. L. Rodriguez, H. Yamamoto, T. Bergfeld, B. I. Eisenstein, J. Ernst, G. E. Gladding, G. D. Gollin, R. M. Hans, E. Johnson, I. Karliner, M. A. Marsh, M. Palmer, C. Plager, C. Sedlack, M. Selen, J. I. Thaler, J. Williams, K. W. Edwards, A. Bellerive, R. Janicek, P. M. Patel, A. J. Sadoff, R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, R. Davis, S. Kotov, I. Kravchenko, N. Kwak, X. Zhao, L. Zhou, S. Anderson, Y. Kubota, S. J. Lee, R. Mahapatra, J. J. O'Neill, R. Poling, T. Riehle, A. Smith, M. S. Alam, S. B. Athar, Z. Ling, A. H. Mahmood, S. Timm, F. Wappler, A. Anastassov, J. E. Duboscq, K. K. Gan, C. Gwon, T. Hart, K. Honscheid, H. Kagan, R. Kass, J. Lorenc, H. Schwarthoff, A. Wolf, M. M. Zoeller, S. J. Richichi, H. Severini, P. Skubic, A. Undrus, M. Bishai, S. Chen, J. Fast, J. W. Hinson, J. Lee, N. Menon, D. H. Miller, E. I. Shibata, I. P.J. Shipsey, S. Glenn, Y. Kwon, A. L. Lyon, E. H. Thorndike, C. P. Jessop, K. Lingel, H. Marsiske, M. L. Perl, V. Savinov, D. Ugolini, X. Zhou, T. E. Coan, V. Fadeyev, I. Korolkov, Y. Maravin, I. Narsky, R. Stroynowski, J. Ye, T. Wlodek, M. Artuso, S. Ayad, E. Dambasuren, S. Kopp, G. Majumder, G. C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, A. Titov, G. Viehhauser, J. C. Wang, S. E. Csorna, K. W. McLean, S. Marka, Z. Xu, R. Godang, K. Kinoshita, I. C. Lai, P. Pomianowski, S. Schrenk, G. Bonvicini, D. Cinabro, R. Greene, L. P. Perera, G. J. Zhou, S. Chan, G. Eigen, E. Lipeles, M. Schmidtler, A. Shapiro, W. M. Sun, J. Urheim, A. J. Weinstein, F. Würthwein, D. E. Jaffe, G. Masek, H. P. Paar, E. M. Potter, S. Prell, V. Sharma

Research output: Contribution to journalArticle

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Abstract

Based on a sample corresponding to 4.3×106 produced τ-pair events, we have studied hadronic dynamics in the decay τ-→ντπ-π 0π0 in data recorded by the CLEO II detector operating at the CESR e+e- collider. The decay is dominated by the process τ-→ντa1-(1260), with the a1- meson decaying to three pions predominantly via the lowest dimensional (mainly S-wave) ρ-π0 Born amplitude. From model-dependent fits to the Dalitz plot and angular observables in bins of 3 π mass, we find significant additional contributions from amplitudes for a1 decay to σπ, f0(1370)π, and f2(1270)π, as well as higher dimensional a1→ρπ and ρ′ π amplitudes. Notably, the squared σπ amplitude accounts for approximately 15% of the total τ- →ντπ-π0π0 rate in the models considered. The data are well described using couplings to these amplitudes that are independent of the 3π mass. These amplitudes also provide a good description for the τ- →ντπ-π0π0 Dalitz plot distributions. We have searched for additional contributions from τ-→ντπ′ -(1300). We place 90% confidence level upper limits on the branching fraction for this channel of between 1.0×10-4 and 1.9×10-4, depending on the π′ decay mode considered. The π-π0π0 mass spectrum is parametrized by a Breit-Wigner form with a mass-dependent width which is specified according to the results of the Dalitz plot fits plus an unknown coupling to an a1→K*K amplitude. From a χ2 fit using this parametrization, we extract the pole mass and width of the a1, as well as the magnitude of the K*K coupling. We have also investigated the impact of a possible contribution from the a1′(1700) meson on this spectrum. Finally, exploiting the parity-violating angular asymmetry in a1→3π decay, we determine the signed value of the τ neutrino helicity to be hντ=-1.02±0.13 (stat)±0.03 (syst+model), confirming the left-handedness of the τ neutrino.

Original languageEnglish
Article number012002
Pages (from-to)1-22
Number of pages22
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume61
Issue number1
Publication statusPublished - 2000 Jan 1

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neutrinos
decay
plots
mesons
handedness
mass spectra
S waves
confidence
parity
pions
poles
asymmetry
detectors

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Asner, D. M., Eppich, A., Gronberg, J., Hill, T. S., Lange, D. J., Morrison, R. J., ... Sharma, V. (2000). Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity. Physical Review D - Particles, Fields, Gravitation and Cosmology, 61(1), 1-22. [012002].
Asner, D. M. ; Eppich, A. ; Gronberg, J. ; Hill, T. S. ; Lange, D. J. ; Morrison, R. J. ; Nelson, H. N. ; Nelson, T. K. ; Roberts, D. ; Behrens, B. H. ; Ford, W. T. ; Gritsan, A. ; Krieg, H. ; Roy, J. ; Smith, J. G. ; Alexander, J. P. ; Baker, R. ; Bebek, C. ; Berger, B. E. ; Berkelman, K. ; Boisvert, V. ; Cassel, D. G. ; Crowcroft, D. S. ; Dickson, M. ; Von Dombrowski, S. ; Drell, P. S. ; Ecklund, K. M. ; Ehrlich, R. ; Foland, A. D. ; Gaidarev, P. ; Galik, R. S. ; Gibbons, L. ; Gittelman, B. ; Gray, S. W. ; Hartill, D. L. ; Heltsley, B. K. ; Hopman, P. I. ; Kreinick, D. L. ; Lee, T. ; Liu, Y. ; Meyer, T. O. ; Mistry, N. B. ; Ng, C. R. ; Nordberg, E. ; Ogg, M. ; Patterson, J. R. ; Peterson, D. ; Riley, D. ; Soffer, A. ; Thayer, J. G. ; Thies, P. G. ; Valant-Spaight, B. ; Warburton, A. ; Ward, C. ; Athanas, M. ; Avery, P. ; Jones, C. D. ; Lohner, M. ; Prescot, C. ; Rubiera, A. I. ; Yelton, J. ; Zheng, J. ; Brandenburg, G. ; Briere, R. A. ; Ershov, A. ; Gao, Y. S. ; Kim, D. Y.J. ; Wilson, R. ; Browder, T. E. ; Li, Y. ; Rodriguez, J. L. ; Yamamoto, H. ; Bergfeld, T. ; Eisenstein, B. I. ; Ernst, J. ; Gladding, G. E. ; Gollin, G. D. ; Hans, R. M. ; Johnson, E. ; Karliner, I. ; Marsh, M. A. ; Palmer, M. ; Plager, C. ; Sedlack, C. ; Selen, M. ; Thaler, J. I. ; Williams, J. ; Edwards, K. W. ; Bellerive, A. ; Janicek, R. ; Patel, P. M. ; Sadoff, A. J. ; Ammar, R. ; Baringer, P. ; Bean, A. ; Besson, D. ; Coppage, D. ; Davis, R. ; Kotov, S. ; Kravchenko, I. ; Kwak, N. ; Zhao, X. ; Zhou, L. ; Anderson, S. ; Kubota, Y. ; Lee, S. J. ; Mahapatra, R. ; O'Neill, J. J. ; Poling, R. ; Riehle, T. ; Smith, A. ; Alam, M. S. ; Athar, S. B. ; Ling, Z. ; Mahmood, A. H. ; Timm, S. ; Wappler, F. ; Anastassov, A. ; Duboscq, J. E. ; Gan, K. K. ; Gwon, C. ; Hart, T. ; Honscheid, K. ; Kagan, H. ; Kass, R. ; Lorenc, J. ; Schwarthoff, H. ; Wolf, A. ; Zoeller, M. M. ; Richichi, S. J. ; Severini, H. ; Skubic, P. ; Undrus, A. ; Bishai, M. ; Chen, S. ; Fast, J. ; Hinson, J. W. ; Lee, J. ; Menon, N. ; Miller, D. H. ; Shibata, E. I. ; Shipsey, I. P.J. ; Glenn, S. ; Kwon, Y. ; Lyon, A. L. ; Thorndike, E. H. ; Jessop, C. P. ; Lingel, K. ; Marsiske, H. ; Perl, M. L. ; Savinov, V. ; Ugolini, D. ; Zhou, X. ; Coan, T. E. ; Fadeyev, V. ; Korolkov, I. ; Maravin, Y. ; Narsky, I. ; Stroynowski, R. ; Ye, J. ; Wlodek, T. ; Artuso, M. ; Ayad, S. ; Dambasuren, E. ; Kopp, S. ; Majumder, G. ; Moneti, G. C. ; Mountain, R. ; Schuh, S. ; Skwarnicki, T. ; Stone, S. ; Titov, A. ; Viehhauser, G. ; Wang, J. C. ; Csorna, S. E. ; McLean, K. W. ; Marka, S. ; Xu, Z. ; Godang, R. ; Kinoshita, K. ; Lai, I. C. ; Pomianowski, P. ; Schrenk, S. ; Bonvicini, G. ; Cinabro, D. ; Greene, R. ; Perera, L. P. ; Zhou, G. J. ; Chan, S. ; Eigen, G. ; Lipeles, E. ; Schmidtler, M. ; Shapiro, A. ; Sun, W. M. ; Urheim, J. ; Weinstein, A. J. ; Würthwein, F. ; Jaffe, D. E. ; Masek, G. ; Paar, H. P. ; Potter, E. M. ; Prell, S. ; Sharma, V. / Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2000 ; Vol. 61, No. 1. pp. 1-22.
@article{dc1785bd471448c7a4298af2b052576a,
title = "Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity",
abstract = "Based on a sample corresponding to 4.3×106 produced τ-pair events, we have studied hadronic dynamics in the decay τ-→ντπ-π 0π0 in data recorded by the CLEO II detector operating at the CESR e+e- collider. The decay is dominated by the process τ-→ντa1-(1260), with the a1- meson decaying to three pions predominantly via the lowest dimensional (mainly S-wave) ρ-π0 Born amplitude. From model-dependent fits to the Dalitz plot and angular observables in bins of 3 π mass, we find significant additional contributions from amplitudes for a1 decay to σπ, f0(1370)π, and f2(1270)π, as well as higher dimensional a1→ρπ and ρ′ π amplitudes. Notably, the squared σπ amplitude accounts for approximately 15{\%} of the total τ- →ντπ-π0π0 rate in the models considered. The data are well described using couplings to these amplitudes that are independent of the 3π mass. These amplitudes also provide a good description for the τ- →ντπ-π0π0 Dalitz plot distributions. We have searched for additional contributions from τ-→ντπ′ -(1300). We place 90{\%} confidence level upper limits on the branching fraction for this channel of between 1.0×10-4 and 1.9×10-4, depending on the π′ decay mode considered. The π-π0π0 mass spectrum is parametrized by a Breit-Wigner form with a mass-dependent width which is specified according to the results of the Dalitz plot fits plus an unknown coupling to an a1→K*K amplitude. From a χ2 fit using this parametrization, we extract the pole mass and width of the a1, as well as the magnitude of the K*K coupling. We have also investigated the impact of a possible contribution from the a1′(1700) meson on this spectrum. Finally, exploiting the parity-violating angular asymmetry in a1→3π decay, we determine the signed value of the τ neutrino helicity to be hντ=-1.02±0.13 (stat)±0.03 (syst+model), confirming the left-handedness of the τ neutrino.",
author = "Asner, {D. M.} and A. Eppich and J. Gronberg and Hill, {T. S.} and Lange, {D. J.} and Morrison, {R. J.} and Nelson, {H. N.} and Nelson, {T. K.} and D. Roberts and Behrens, {B. H.} and Ford, {W. T.} and A. Gritsan and H. Krieg and J. Roy and Smith, {J. G.} and Alexander, {J. P.} and R. Baker and C. Bebek and Berger, {B. E.} and K. Berkelman and V. Boisvert and Cassel, {D. G.} and Crowcroft, {D. S.} and M. Dickson and {Von Dombrowski}, S. and Drell, {P. S.} and Ecklund, {K. M.} and R. Ehrlich and Foland, {A. D.} and P. Gaidarev and Galik, {R. S.} and L. Gibbons and B. Gittelman and Gray, {S. W.} and Hartill, {D. L.} and Heltsley, {B. K.} and Hopman, {P. I.} and Kreinick, {D. L.} and T. Lee and Y. Liu and Meyer, {T. O.} and Mistry, {N. B.} and Ng, {C. R.} and E. Nordberg and M. Ogg and Patterson, {J. R.} and D. Peterson and D. Riley and A. Soffer and Thayer, {J. G.} and Thies, {P. G.} and B. Valant-Spaight and A. Warburton and C. Ward and M. Athanas and P. Avery and Jones, {C. D.} and M. Lohner and C. Prescot and Rubiera, {A. I.} and J. Yelton and J. Zheng and G. Brandenburg and Briere, {R. A.} and A. Ershov and Gao, {Y. S.} and Kim, {D. Y.J.} and R. Wilson and Browder, {T. E.} and Y. Li and Rodriguez, {J. L.} and H. Yamamoto and T. Bergfeld and Eisenstein, {B. I.} and J. Ernst and Gladding, {G. E.} and Gollin, {G. D.} and Hans, {R. M.} and E. Johnson and I. Karliner and Marsh, {M. A.} and M. Palmer and C. Plager and C. Sedlack and M. Selen and Thaler, {J. I.} and J. Williams and Edwards, {K. W.} and A. Bellerive and R. Janicek and Patel, {P. M.} and Sadoff, {A. J.} and R. Ammar and P. Baringer and A. Bean and D. Besson and D. Coppage and R. Davis and S. Kotov and I. Kravchenko and N. Kwak and X. Zhao and L. Zhou and S. Anderson and Y. Kubota and Lee, {S. J.} and R. Mahapatra and O'Neill, {J. J.} and R. Poling and T. Riehle and A. Smith and Alam, {M. S.} and Athar, {S. B.} and Z. Ling and Mahmood, {A. H.} and S. Timm and F. Wappler and A. Anastassov and Duboscq, {J. E.} and Gan, {K. K.} and C. Gwon and T. Hart and K. Honscheid and H. Kagan and R. Kass and J. Lorenc and H. Schwarthoff and A. Wolf and Zoeller, {M. M.} and Richichi, {S. J.} and H. Severini and P. Skubic and A. Undrus and M. Bishai and S. Chen and J. Fast and Hinson, {J. W.} and J. Lee and N. Menon and Miller, {D. H.} and Shibata, {E. I.} and Shipsey, {I. P.J.} and S. Glenn and Y. Kwon and Lyon, {A. L.} and Thorndike, {E. H.} and Jessop, {C. P.} and K. Lingel and H. Marsiske and Perl, {M. L.} and V. Savinov and D. Ugolini and X. Zhou and Coan, {T. E.} and V. Fadeyev and I. Korolkov and Y. Maravin and I. Narsky and R. Stroynowski and J. Ye and T. Wlodek and M. Artuso and S. Ayad and E. Dambasuren and S. Kopp and G. Majumder and Moneti, {G. C.} and R. Mountain and S. Schuh and T. Skwarnicki and S. Stone and A. Titov and G. Viehhauser and Wang, {J. C.} and Csorna, {S. E.} and McLean, {K. W.} and S. Marka and Z. Xu and R. Godang and K. Kinoshita and Lai, {I. C.} and P. Pomianowski and S. Schrenk and G. Bonvicini and D. Cinabro and R. Greene and Perera, {L. P.} and Zhou, {G. J.} and S. Chan and G. Eigen and E. Lipeles and M. Schmidtler and A. Shapiro and Sun, {W. M.} and J. Urheim and Weinstein, {A. J.} and F. W{\"u}rthwein and Jaffe, {D. E.} and G. Masek and Paar, {H. P.} and Potter, {E. M.} and S. Prell and V. Sharma",
year = "2000",
month = "1",
day = "1",
language = "English",
volume = "61",
pages = "1--22",
journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",
issn = "1550-7998",
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Asner, DM, Eppich, A, Gronberg, J, Hill, TS, Lange, DJ, Morrison, RJ, Nelson, HN, Nelson, TK, Roberts, D, Behrens, BH, Ford, WT, Gritsan, A, Krieg, H, Roy, J, Smith, JG, Alexander, JP, Baker, R, Bebek, C, Berger, BE, Berkelman, K, Boisvert, V, Cassel, DG, Crowcroft, DS, Dickson, M, Von Dombrowski, S, Drell, PS, Ecklund, KM, Ehrlich, R, Foland, AD, Gaidarev, P, Galik, RS, Gibbons, L, Gittelman, B, Gray, SW, Hartill, DL, Heltsley, BK, Hopman, PI, Kreinick, DL, Lee, T, Liu, Y, Meyer, TO, Mistry, NB, Ng, CR, Nordberg, E, Ogg, M, Patterson, JR, Peterson, D, Riley, D, Soffer, A, Thayer, JG, Thies, PG, Valant-Spaight, B, Warburton, A, Ward, C, Athanas, M, Avery, P, Jones, CD, Lohner, M, Prescot, C, Rubiera, AI, Yelton, J, Zheng, J, Brandenburg, G, Briere, RA, Ershov, A, Gao, YS, Kim, DYJ, Wilson, R, Browder, TE, Li, Y, Rodriguez, JL, Yamamoto, H, Bergfeld, T, Eisenstein, BI, Ernst, J, Gladding, GE, Gollin, GD, Hans, RM, Johnson, E, Karliner, I, Marsh, MA, Palmer, M, Plager, C, Sedlack, C, Selen, M, Thaler, JI, Williams, J, Edwards, KW, Bellerive, A, Janicek, R, Patel, PM, Sadoff, AJ, Ammar, R, Baringer, P, Bean, A, Besson, D, Coppage, D, Davis, R, Kotov, S, Kravchenko, I, Kwak, N, Zhao, X, Zhou, L, Anderson, S, Kubota, Y, Lee, SJ, Mahapatra, R, O'Neill, JJ, Poling, R, Riehle, T, Smith, A, Alam, MS, Athar, SB, Ling, Z, Mahmood, AH, Timm, S, Wappler, F, Anastassov, A, Duboscq, JE, Gan, KK, Gwon, C, Hart, T, Honscheid, K, Kagan, H, Kass, R, Lorenc, J, Schwarthoff, H, Wolf, A, Zoeller, MM, Richichi, SJ, Severini, H, Skubic, P, Undrus, A, Bishai, M, Chen, S, Fast, J, Hinson, JW, Lee, J, Menon, N, Miller, DH, Shibata, EI, Shipsey, IPJ, Glenn, S, Kwon, Y, Lyon, AL, Thorndike, EH, Jessop, CP, Lingel, K, Marsiske, H, Perl, ML, Savinov, V, Ugolini, D, Zhou, X, Coan, TE, Fadeyev, V, Korolkov, I, Maravin, Y, Narsky, I, Stroynowski, R, Ye, J, Wlodek, T, Artuso, M, Ayad, S, Dambasuren, E, Kopp, S, Majumder, G, Moneti, GC, Mountain, R, Schuh, S, Skwarnicki, T, Stone, S, Titov, A, Viehhauser, G, Wang, JC, Csorna, SE, McLean, KW, Marka, S, Xu, Z, Godang, R, Kinoshita, K, Lai, IC, Pomianowski, P, Schrenk, S, Bonvicini, G, Cinabro, D, Greene, R, Perera, LP, Zhou, GJ, Chan, S, Eigen, G, Lipeles, E, Schmidtler, M, Shapiro, A, Sun, WM, Urheim, J, Weinstein, AJ, Würthwein, F, Jaffe, DE, Masek, G, Paar, HP, Potter, EM, Prell, S & Sharma, V 2000, 'Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 61, no. 1, 012002, pp. 1-22.

Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity. / Asner, D. M.; Eppich, A.; Gronberg, J.; Hill, T. S.; Lange, D. J.; Morrison, R. J.; Nelson, H. N.; Nelson, T. K.; Roberts, D.; Behrens, B. H.; Ford, W. T.; Gritsan, A.; Krieg, H.; Roy, J.; Smith, J. G.; Alexander, J. P.; Baker, R.; Bebek, C.; Berger, B. E.; Berkelman, K.; Boisvert, V.; Cassel, D. G.; Crowcroft, D. S.; Dickson, M.; Von Dombrowski, S.; Drell, P. S.; Ecklund, K. M.; Ehrlich, R.; Foland, A. D.; Gaidarev, P.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hopman, P. I.; Kreinick, D. L.; Lee, T.; Liu, Y.; Meyer, T. O.; Mistry, N. B.; Ng, C. R.; Nordberg, E.; Ogg, M.; Patterson, J. R.; Peterson, D.; Riley, D.; Soffer, A.; Thayer, J. G.; Thies, P. G.; Valant-Spaight, B.; Warburton, A.; Ward, C.; Athanas, M.; Avery, P.; Jones, C. D.; Lohner, M.; Prescot, C.; Rubiera, A. I.; Yelton, J.; Zheng, J.; Brandenburg, G.; Briere, R. A.; Ershov, A.; Gao, Y. S.; Kim, D. Y.J.; Wilson, R.; Browder, T. E.; Li, Y.; Rodriguez, J. L.; Yamamoto, H.; Bergfeld, T.; Eisenstein, B. I.; Ernst, J.; Gladding, G. E.; Gollin, G. D.; Hans, R. M.; Johnson, E.; Karliner, I.; Marsh, M. A.; Palmer, M.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. I.; Williams, J.; Edwards, K. W.; Bellerive, A.; Janicek, R.; Patel, P. M.; Sadoff, A. J.; Ammar, R.; Baringer, P.; Bean, A.; Besson, D.; Coppage, D.; Davis, R.; Kotov, S.; Kravchenko, I.; Kwak, N.; Zhao, X.; Zhou, L.; Anderson, S.; Kubota, Y.; Lee, S. J.; Mahapatra, R.; O'Neill, J. J.; Poling, R.; Riehle, T.; Smith, A.; Alam, M. S.; Athar, S. B.; Ling, Z.; Mahmood, A. H.; Timm, S.; Wappler, F.; Anastassov, A.; Duboscq, J. E.; Gan, K. K.; Gwon, C.; Hart, T.; Honscheid, K.; Kagan, H.; Kass, R.; Lorenc, J.; Schwarthoff, H.; Wolf, A.; Zoeller, M. M.; Richichi, S. J.; Severini, H.; Skubic, P.; Undrus, A.; Bishai, M.; Chen, S.; Fast, J.; Hinson, J. W.; Lee, J.; Menon, N.; Miller, D. H.; Shibata, E. I.; Shipsey, I. P.J.; Glenn, S.; Kwon, Y.; Lyon, A. L.; Thorndike, E. H.; Jessop, C. P.; Lingel, K.; Marsiske, H.; Perl, M. L.; Savinov, V.; Ugolini, D.; Zhou, X.; Coan, T. E.; Fadeyev, V.; Korolkov, I.; Maravin, Y.; Narsky, I.; Stroynowski, R.; Ye, J.; Wlodek, T.; Artuso, M.; Ayad, S.; Dambasuren, E.; Kopp, S.; Majumder, G.; Moneti, G. C.; Mountain, R.; Schuh, S.; Skwarnicki, T.; Stone, S.; Titov, A.; Viehhauser, G.; Wang, J. C.; Csorna, S. E.; McLean, K. W.; Marka, S.; Xu, Z.; Godang, R.; Kinoshita, K.; Lai, I. C.; Pomianowski, P.; Schrenk, S.; Bonvicini, G.; Cinabro, D.; Greene, R.; Perera, L. P.; Zhou, G. J.; Chan, S.; Eigen, G.; Lipeles, E.; Schmidtler, M.; Shapiro, A.; Sun, W. M.; Urheim, J.; Weinstein, A. J.; Würthwein, F.; Jaffe, D. E.; Masek, G.; Paar, H. P.; Potter, E. M.; Prell, S.; Sharma, V.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 61, No. 1, 012002, 01.01.2000, p. 1-22.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hadronic structure in the decay τ-→ντπ-π 0π0 and the sign of the tau neutrino helicity

AU - Asner, D. M.

AU - Eppich, A.

AU - Gronberg, J.

AU - Hill, T. S.

AU - Lange, D. J.

AU - Morrison, R. J.

AU - Nelson, H. N.

AU - Nelson, T. K.

AU - Roberts, D.

AU - Behrens, B. H.

AU - Ford, W. T.

AU - Gritsan, A.

AU - Krieg, H.

AU - Roy, J.

AU - Smith, J. G.

AU - Alexander, J. P.

AU - Baker, R.

AU - Bebek, C.

AU - Berger, B. E.

AU - Berkelman, K.

AU - Boisvert, V.

AU - Cassel, D. G.

AU - Crowcroft, D. S.

AU - Dickson, M.

AU - Von Dombrowski, S.

AU - Drell, P. S.

AU - Ecklund, K. M.

AU - Ehrlich, R.

AU - Foland, A. D.

AU - Gaidarev, P.

AU - Galik, R. S.

AU - Gibbons, L.

AU - Gittelman, B.

AU - Gray, S. W.

AU - Hartill, D. L.

AU - Heltsley, B. K.

AU - Hopman, P. I.

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PY - 2000/1/1

Y1 - 2000/1/1

N2 - Based on a sample corresponding to 4.3×106 produced τ-pair events, we have studied hadronic dynamics in the decay τ-→ντπ-π 0π0 in data recorded by the CLEO II detector operating at the CESR e+e- collider. The decay is dominated by the process τ-→ντa1-(1260), with the a1- meson decaying to three pions predominantly via the lowest dimensional (mainly S-wave) ρ-π0 Born amplitude. From model-dependent fits to the Dalitz plot and angular observables in bins of 3 π mass, we find significant additional contributions from amplitudes for a1 decay to σπ, f0(1370)π, and f2(1270)π, as well as higher dimensional a1→ρπ and ρ′ π amplitudes. Notably, the squared σπ amplitude accounts for approximately 15% of the total τ- →ντπ-π0π0 rate in the models considered. The data are well described using couplings to these amplitudes that are independent of the 3π mass. These amplitudes also provide a good description for the τ- →ντπ-π0π0 Dalitz plot distributions. We have searched for additional contributions from τ-→ντπ′ -(1300). We place 90% confidence level upper limits on the branching fraction for this channel of between 1.0×10-4 and 1.9×10-4, depending on the π′ decay mode considered. The π-π0π0 mass spectrum is parametrized by a Breit-Wigner form with a mass-dependent width which is specified according to the results of the Dalitz plot fits plus an unknown coupling to an a1→K*K amplitude. From a χ2 fit using this parametrization, we extract the pole mass and width of the a1, as well as the magnitude of the K*K coupling. We have also investigated the impact of a possible contribution from the a1′(1700) meson on this spectrum. Finally, exploiting the parity-violating angular asymmetry in a1→3π decay, we determine the signed value of the τ neutrino helicity to be hντ=-1.02±0.13 (stat)±0.03 (syst+model), confirming the left-handedness of the τ neutrino.

AB - Based on a sample corresponding to 4.3×106 produced τ-pair events, we have studied hadronic dynamics in the decay τ-→ντπ-π 0π0 in data recorded by the CLEO II detector operating at the CESR e+e- collider. The decay is dominated by the process τ-→ντa1-(1260), with the a1- meson decaying to three pions predominantly via the lowest dimensional (mainly S-wave) ρ-π0 Born amplitude. From model-dependent fits to the Dalitz plot and angular observables in bins of 3 π mass, we find significant additional contributions from amplitudes for a1 decay to σπ, f0(1370)π, and f2(1270)π, as well as higher dimensional a1→ρπ and ρ′ π amplitudes. Notably, the squared σπ amplitude accounts for approximately 15% of the total τ- →ντπ-π0π0 rate in the models considered. The data are well described using couplings to these amplitudes that are independent of the 3π mass. These amplitudes also provide a good description for the τ- →ντπ-π0π0 Dalitz plot distributions. We have searched for additional contributions from τ-→ντπ′ -(1300). We place 90% confidence level upper limits on the branching fraction for this channel of between 1.0×10-4 and 1.9×10-4, depending on the π′ decay mode considered. The π-π0π0 mass spectrum is parametrized by a Breit-Wigner form with a mass-dependent width which is specified according to the results of the Dalitz plot fits plus an unknown coupling to an a1→K*K amplitude. From a χ2 fit using this parametrization, we extract the pole mass and width of the a1, as well as the magnitude of the K*K coupling. We have also investigated the impact of a possible contribution from the a1′(1700) meson on this spectrum. Finally, exploiting the parity-violating angular asymmetry in a1→3π decay, we determine the signed value of the τ neutrino helicity to be hντ=-1.02±0.13 (stat)±0.03 (syst+model), confirming the left-handedness of the τ neutrino.

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M3 - Article

AN - SCOPUS:17144381330

VL - 61

SP - 1

EP - 22

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 1

M1 - 012002

ER -