2014/03/28 by Rafel Escribano, Escribano, Rafel
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th) #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.1403.7453
6 pages, 1 figure, uses PoS style. Poster presented at the XV International Conference on Hadron Spectroscopy (HADRON 13), Nara Prefectural New Public Hall, Nara (Japan), November 4-8, 2013
arxiv created 2014/03/28 · arxiv updated 2014/03/31
The decays τ-→ K-ηντ and K-η^′ντ are studied in the context of Chiral Perturbation Theory supplemented with the explicit inclusion of resonances. For the required vector-form factors we have explored three different possibilities according to the treatment of final-state interactions: Breit-Wigner parametrisation, exponential resummation and dispersive representation. In the first part of the analysis, we predict the invariant mass spectrum and the integrated branching ratio for both decays from a fit to data on τ-→ KSπ-ντ decays. In the second part, we take advantage of existing data on τ-→ K-ηντ from BABAR and Belle collaborations and perform a fit to extract the pole position of the K^∗(1410) resonance which is seen to be in agreement and competitive with the values obtained before. From the comparison to data we conclude that the Breit-Wigner parametrisation of form factors is too na"ıve and consequently the use of more advanced treatments such as exponential resummation or dispersive representation is essential.