https://doi.org/10.1140/epjc/s10052-020-7939-1
Regular Article - Theoretical Physics
Signatures of the two 
poles in 
decay
1
Department of Physics, Guangxi Normal University, Guilin, 541004, China
2
School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, Henan, China
3
Departamento de Física, Universidad de Murcia, 30100, Murcia, Spain
4
Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin, 541004, China
5
Departamento de Física Teórica e IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Apdo 22085, 46071, Valencia, Spain
* e-mail: luisroca@um.es
Received:
25
February
2020
Accepted:
15
April
2020
Published online:
8
May
2020
We analyze theoretically the 
and 
decays to see the feasibility to check the double pole nature of the axial-vector resonance predicted by the unitary extensions of chiral perturbation theory (UChPT). Indeed, within UChPT the is dynamically generated from the interaction of a vector and a pseudoscalar meson, and two poles are obtained for the quantum numbers of this resonance. The lower mass pole couples dominantly to 
and the higher mass pole to 
, therefore we can expect that different reactions weighing differently these channels in the production mechanisms enhance one or the other pole. We show that the different final VP channels in weigh differently both poles, and this is reflected in the shape of the final vector-pseudoscalar invariant mass distributions. Therefore, we conclude that these decays are suitable to distinguish experimentally the predicted double pole of the resonance.
© The Author(s), 2020
