Authors

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
Bonivicini, 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
Wurthwein, F
Jaffe, DE
Masek, G
Paar, HP
Potter, EM
Prell, S
Sharma, V

Citation

Dm. Asner et al., Hadronic structure in the decay tau(-) -> nu(tau)pi(-) pi(0) pi(0) and thesign of the tau neutrino helicity - art. no. 012002, PHYS REV D, 6101(1), 2000, pp. 2002

Citations number

39

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW D

ISSN journal

0556-2821
→ ACNP

Volume

6101

Issue

1

Year of publication

2000

Database

ISI

SICI code

0556-2821(20000101)6101:1<2002:HSITDT>2.0.ZU;2-2

Abstract

Based on a sample corresponding to 4.3 x 10(6) produced tau-pair events, we
have studied hadronic dynamics in the decay tau(-)--> nu(tau) pi(-) pi(o)p
i(o) in data recorded by the CLEO II detector operating at the CESR e(+)e(-
) collider. The decay is dominated by the process tau(-)-->nu(tau)a(1)(-)(1
260), with the a(1)(-) meson decaying to three pions predominantly via the
lowest dimensional (mainly S-wave) rho(-)pi(o) Born amplitude. From model-d
ependent fits to the Dalitz plot and angular observables in bins of 3 pi ma
ss, we find significant additional contributions from amplitudes for a(1) d
ecay to sigma pi, f(o)(1370) pi, and f(2)(1270) pi, as well as higher dimen
sional a(1)-->rho pi and rho' pi amplitudes. Notably, the squared sigma pi
amplitude accounts for approximately 15% of the total tau(-)-->nu(tau)pi(-)
pi(o)pi(o) rate in the models considered. The data are well described using
couplings to these amplitudes that are independent of the 3 pi mass. These
amplitudes also provide a good description for the tau(-) -->nu(tau)pi(-)p
i(+)pi(-) Dalitz plot distributions. We have searched for additional contri
butions from tau(-)-->nu(tau)pi' -(1300). We place 90% confidence level upp
er limits on the branching fraction for this channel of between 1.0 x 10(-4
) and 1.9 x 10(-4), depending on the pi' decay mode considered. The pi(-)pi
(o)pi(o) mass spectrum is parametrized by a Breit-Wigner form with a mass-d
ependent width which is specified according to the results of the Dalitz pl
ot fits plus an unknown coupling to an a(1)-->K*K amplitude. From a chi(2)
fit using this parametrization, we extract the pole mass and width of the a
(1), as well as the magnitude of the K*K coupling. We have also investigate
d the impact of a possible contribution from the a(1)'(1700) meson on this
spectrum. Finally, exploiting the parity-violating angular asymmetry in a(1
)-->3 pi decay, we determine the signed value of the tau neutrino helicity
to be h(nu tau) = - 1.02+/-0.13 (stat) +/- 0.03 (syst + model), confirming
the left-handedness of the tau neutrino.