June 29, 2015 to July 3, 2015
Europe/Rome timezone

Pseudoscalar decays into lepton pairs from rational approximants

Jun 30, 2015, 5:10 PM
Aula Magna (Building E, Polo Fibonacci, Pisa)

Aula Magna

Building E, Polo Fibonacci, Pisa

Talk Goldstone Boson Working Group Parallel Session 4 - Goldstone Boson WG


Pablo Sanchez Puertas (Johannes Gutenberg University, Mainz)


Pseudoscalar-meson decays (π0, η, η ) into lepton pairs (e+e−, µ+µ−) are unique in its kind as they probe the neutral pseudoscalar meson structure in the whole energy-range. This structure, which is encoded in the doubly virtual transition form factor (TFF) governing their interactions with two photons, needs a complete energy description. In this work, we identify the relevant energy regimes related to this processes and propose the use of rational approximants for describing the TFF, emphasizing the correct low- energy description and high-energy implementation. Motivated by the range spanned by the pseudoscalar masses, we will discuss the use of different rational approximants: Pade' approximants, which have been successfully used in the past [1,2], its necessary extension to their bivariate version (Canterbury approximants) [3] , and, as a novel approach, Quadratic approximants [4], which are very interesting, specially, for the η case. Finally, we calculate the branching ratios for the different processes and estimate the different uncertainties, highlighting possible future experiments that may improve our description. References 1. P. Masjuan, Phys. Rev. D 86, 094021 (2012). 2. R. Escribano, P. Masjuan, and P. Sanchez-Puertas, Phys. Rev. D 89, 034014, (2014). 3. P. Masjuan, and P. Sanchez-Puertas, In preparation. 2. S. Gonzalez-Solis, P. Masjuan, and P. Sanchez-Puertas, In preparation.

Primary author

Pablo Sanchez Puertas (Johannes Gutenberg University, Mainz)


Pere Masjuan (Johannes Gutenberg-Universität Mainz, Institute für Kernphysik)

Presentation materials