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Title: Hadronic decays of the tau lepton : {tau}- {yields} ({pi}{pi}{pi})- {nu}{tau} within Resonance Chiral Theory

Abstract

{tau} decays into hadrons foresee the study of the hadronization of vector and axial-vector QCD currents, yielding relevant information on the dynamics of the resonances entering into the processes. We analyse {tau} {yields} {pi}{pi}{pi}{nu}{tau} decays within the framework of the Resonance Chiral Theory, comparing this theoretical scheme with the experimental data, namely ALEPH spectral function and branching ratio. Hence we get values for the mass and on-shell width of the a 1 (1260) resonance, and provide the structure functions that have been measured by OPAL and CLEO-II.

Authors:
 [1]; ;  [2]
  1. IFLP, CONICET - Depto. de Fisica, Univ. Nac. de la Plata, C.C. 67, 1900 La Plata (Argentina)
  2. Instituto de Fisica Corpuscular, IFIC, CSIC-Universitat de Valencia, Edifici d'Instituts de Paterna, Apt. Correus 22085, E-46071 Valencia (Spain)
Publication Date:
OSTI Identifier:
20787626
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 806; Journal Issue: 1; Conference: International workshop on quantum chromodynamics: Theory and experiment, Conversano, Bari (Italy), 16-20 Jun 2005; Other Information: DOI: 10.1063/1.2163740; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AXIAL-VECTOR CURRENTS; BRANCHING RATIO; CESR STORAGE RING; CHIRAL SYMMETRY; CHIRALITY; HADRONIC PARTICLE DECAY; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PARTICLE PRODUCTION; PARTICLE WIDTHS; PIONS; QUANTUM CHROMODYNAMICS; RESONANCE PARTICLES; SPECTRAL FUNCTIONS; STRUCTURE FUNCTIONS; TAU NEUTRINOS; TAU PARTICLES; VECTOR CURRENTS

Citation Formats

Gomez Dumm, D., Pich, A., and Portoles, J. Hadronic decays of the tau lepton : {tau}- {yields} ({pi}{pi}{pi})- {nu}{tau} within Resonance Chiral Theory. United States: N. p., 2006. Web. doi:10.1063/1.2163740.
Gomez Dumm, D., Pich, A., & Portoles, J. Hadronic decays of the tau lepton : {tau}- {yields} ({pi}{pi}{pi})- {nu}{tau} within Resonance Chiral Theory. United States. doi:10.1063/1.2163740.
Gomez Dumm, D., Pich, A., and Portoles, J. 2006. "Hadronic decays of the tau lepton : {tau}- {yields} ({pi}{pi}{pi})- {nu}{tau} within Resonance Chiral Theory". United States. doi:10.1063/1.2163740.
@article{osti_20787626,
title = {Hadronic decays of the tau lepton : {tau}- {yields} ({pi}{pi}{pi})- {nu}{tau} within Resonance Chiral Theory},
author = {Gomez Dumm, D. and Pich, A. and Portoles, J.},
abstractNote = {{tau} decays into hadrons foresee the study of the hadronization of vector and axial-vector QCD currents, yielding relevant information on the dynamics of the resonances entering into the processes. We analyse {tau} {yields} {pi}{pi}{pi}{nu}{tau} decays within the framework of the Resonance Chiral Theory, comparing this theoretical scheme with the experimental data, namely ALEPH spectral function and branching ratio. Hence we get values for the mass and on-shell width of the a 1 (1260) resonance, and provide the structure functions that have been measured by OPAL and CLEO-II.},
doi = {10.1063/1.2163740},
journal = {AIP Conference Proceedings},
number = 1,
volume = 806,
place = {United States},
year = 2006,
month = 1
}
  • {tau} decays into hadrons have a twofold interest: On the one hand, they are a clean environment for studying the hadronization of the left-handed current of QCD, while, on the other side, provide relevant dynamical information of the resonances that mediate these processes. Within an effective field theory-like framework, namely Resonance Chiral Theory, we analyse the decays ot the {tau} into KK{pi} modes and compare the results with CLEO and BaBar data. In this way, we provide bounds on the couplings entering our Lagrangian and predict the corresponding spectral functions. As a main result -and contrary to the bulk ofmore » theoretical studies and experimental analyses- we find vector current dominance on these decays.« less
  • We study the temperature evolution of the {l_angle}{bar q}q{r_angle} condensate below the chiral phase transition. The hadronic gas is described using a virial expansion within generalized chiral perturbation theory. In such a way, we can implement both the large or small chiral condensate scenarios and analyze the condensate dependence on the values of the lightest quark masses. {copyright} {ital 1998} {ital The American Physical Society}
  • Corrections to current-algebra analysis of /Kappa/ /yields/ 3/pi/ decay amplitudes are calculated using the dimension-four effective chiral Lagrangians, which are uniquely determined from the integration of nontopological chiral anomalies. The authors find that the constant and linear terms in the /Delta/I = 1/2 amplitude are in good agreement with experiment; the previous discrepancy of 20-35% between current algebra and experiment is thus accounted for by including the higher order chiral Lagrangians. Predictions for quadratic terms are also given for both /Delta/I = 1/2 and 3/2 transitions.
  • In this paper we study two kinds of {tau} decays: (a) {tau}{sup -}{yields}({rho}{sup 0}{pi}{sup -},{omega}{pi}{sup -},{phi}{pi}{sup -},K*{sup 0}K{sup -}){nu}{sub {tau}}, which belong to {delta}S=0 processes and (b) {delta}S=1 processes, such as {tau}{sup -}{yields}({rho}{sup 0}K{sup -},{omega}K{sup -},{phi}K{sup -},K*{sup 0}{pi}{sup -}){nu}{sub {tau}}, in the framework of resonance chiral theory (R{chi}T). We fit the {tau}{sup -}{yields}{omega}{pi}{sup -}{nu}{sub {tau}} spectral function and the invariant mass distribution of {omega}K in the process of {tau}{sup -}{yields}{omega}K{sup -}{nu}{sub {tau}} to get the values of unknown resonance couplings. Then we make a prediction for branching ratios of all channels.
  • This Letter describes a direct search for charged Higgs boson production in p{ovr p} collisions at {radical}(s)=1.8 TeV recorded by the Collider Detector at Fermilab. Two-Higgs-double extensions to the standard model predict the existence of charged Higgs bosons (H{sup {plus_minus}}) . In such models, the branching fraction for top quarks scr(B)(t{r_arrow}H{sup +}b{r_arrow}{tau}{sup +} {nu}b) can be large. This search uses the hadronic decays of the tau lepton in this channel to significantly extend previous limits on H{sup {plus_minus}} production. {copyright} {ital 1997} {ital The American Physical Society}