TY  - JOUR
AU  - Abreu, L. M.
AU  - Song, J.
AU  - Brandao, P. C. S.
AU  - Oset, E.
PY  - 2024
DA  - 2024//
TI  - A note on the tensor and vector exchange contributions to K (K)over-bar → K (K)over-bar, D(D)over-bar → D(D)over-bar and π+π- → π+π- reactions
T2  - Eur. Phys. J. A
JO  - European Physical Journal A
SP  - 76 - 10pp
VL  - 60
IS  - 3
PB  - Springer
AB  - In this note we study the tensor and vector exchange contributions to the elastic reactions involving the pseudoscalars mesons pi(+) pi(-), K+ K- and D+D-. In the case of the tensor-exchange contributions we assume that an intermediate tensor f(2)(1270) is dynamically generated from the interaction of two virtual rho mesons, with the use of a pole approximation. The calculation of the two-loop amplitude is facilitated since the triangle loops can be factorized and computed separately. The results show very small contributions coming from the tensor-exchange mechanisms when compared with those from the vector-exchange processes. We compare our results for pi pi and K (K) over bar scattering with those obtained in other works where the f2(1270) is considered as an ordinary q (q) over bar meson. Our picture provides a smaller contribution but of similar order of magnitude for pion scattering and stabilizes the results in the case of K (K) over bar, allowing us to make estimates for D (D) over bar scattering.
SN  - 1434-6001
UR  - https://arxiv.org/abs/2310.14015
UR  - https://doi.org/10.1140/epja/s10050-024-01300-y
DO  - 10.1140/epja/s10050-024-01300-y
LA  - English
N1  - WOS:001195442000001
ID  - Abreu_etal2024
ER  -