Abstract
We study the dipion transitions . In particular, we consider the effects of the two intermediate bottomoniumlike exotic states and as well as bottom meson loops. The strong pion-pion final-state interactions, especially including channel coupling to in the wave, are taken into account model independently by using dispersion theory. Based on a nonrelativistic effective field theory we find that the contribution from the bottom meson loops is comparable to those from the chiral contact terms and the -exchange terms. For the decay, the result shows that including the effects of the exchange and the bottom meson loops can naturally reproduce the two-hump behavior of the mass spectra. Future angular distribution data are decisive for the identification of different production mechanisms. For the decay, we show that there is a narrow dip around 1 GeV in the invariant mass distribution, caused by the final-state interactions. The distribution is clearly different from that in similar transitions from lower states, and needs to be verified by future data with high statistics. Also we predict the decay width and the dikaon mass distribution of the process.
1 More- Received 4 November 2016
DOI:https://doi.org/10.1103/PhysRevD.95.034022
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