2017/01/17 by A. Palano, Palano, A., M. R. Pennington +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.1701.04881
A new analysis superceding this earlier version is under way and will be submitted to the arXiv once complete. (original version 8 pages, 6 figures)
openalex publication_date 2017/01/17 · arxiv created 2017/11/21 · arxiv updated 2017/11/22 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
A recent analysis of data on the two photon production of the ηc and its decay to K(Kπ) has determined the Kπ S-wave amplitude in a "model-independent" way assuming primarily that the additional kaon is a spectator in this decay. The purpose of this paper is to fit these results, together with classic Kπ production data from LASS, within a formalism that implements unitarity for the di-meson interaction. This fixes the I=1/2 Kπ→ Kπ S-wave amplitude up to 2.4 GeV. This resolves the Barrelet ambiguity in the original LASS analysis, and constrains the amount of inelasticity in Kπ scattering, highlighting that this becomes significant beyond 1.8 GeV. This result needs to be checked by experimental information on the many inelastic channels, in particular Kη^′ and Kπππ. Our analysis provides a single representation for the Kπ S-wave from threshold, controlled by Chiral Perturbation Theory, through the broad κ, K0^*(1430) and K0^*(1950) resonances. There is no arbitrary sum of Breit-Wigner forms and random backgrounds for real Kπ masses. Rather the form provides a representation that can be translated to other processes with Kπ interactions with their own coupling functions, while automatically maintaining consistency with the chiral dynamics near threshold, with the LASS data and the new results on ηc decay.