Exclusive decay of P-wave Bottomonium into double J/\psi

TL;DR

This paper calculates relativistic and electromagnetic corrections to P-wave bottomonium decays into double J/rac12;psi, predicting small but measurable branching ratios, and also estimates related charmonium decay widths.

Contribution

It provides the first detailed calculation of relativistic and electromagnetic corrections to rac12;chi_{bJ} decays into double J/rac12;psi within the NRQCD framework, including predictions for observability at LHC.

Findings

Relativistic correction increases decay width by about 10%.

Electromagnetic correction is negligible (~0.2%).

Predicted branching ratios are around 10^{-5} for rac12;chi_{b0,b2} decays.

Abstract

We calculate the order-v^2 relativistic correction of J/\psi, including electromagnetic correction, to \chi_{bJ}-> J/\psi J/\psi, in the framework of NRQCD factorization formula. The relativistic order-v^2 effect is found to increase the lower-order prediction for the decay width by about 10%, while the electromagnetism contribution is very small about 0.2% for \chi_{b0} and \chi_{b2}. The total branching ratios are predicted to be of order 10^{-5} for \chi_{b0,b2}-> J/\psi J/\psi, but 10^{-11} for \chi_{b1}-> J/\psi J/\psi, since there is only electromagnetism contribution in this channel. We predict it is possible to observe these reactions in LHC. Finally, we estimate the decay width and branch ratio of \chi_{cJ}-> \omega\omega,\phi\phi) in the constituent quark model by our formula at the leading-order of relativistic correction and electromagnetic correction. The obtained branch ratio of \chi_{c0,2}-> \phi\phi is in agreement with the experimental measurement in the order of magnitude.