The momentum distribution of J/psi in B decays
TJ Burns, F Piccinini, AD Polosa, V Prosperi, C Sabelli
TL;DR
This paper investigates the discrepancy in the momentum distribution of slow J/psi in B decays, proposing improvements through recent experimental data and refined theoretical calculations, and suggests potential undiscovered exotic mesons.
Contribution
It introduces an updated analysis of B decays into J/psi using recent data and improved non-relativistic QCD calculations, enhancing the agreement between theory and experiment.
Findings
Improved theory-data agreement for J/psi momentum distribution
Indication of possible undiscovered exotic mesons
Refined non-relativistic QCD calculations
Abstract
The discrepancy between theory and data in the momentum distribution of slow J/psi in B decays has been several times addressed as a puzzle. Using the most recent results on exclusive B decays into J/psi and heavy kaons or exotic mesons and reconsidering the non-relativistic-QCD calculation of the color octet fragmentation component, we show that an improvement in the comparison between data and theory can be obtained. There is still room for a better fit to data and this may imply that new exotic mesons of the XYZ kind have yet to be discovered.
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