The discrepancy between theory and data in the momentum distribution of slow J/ψ in B decays has been several times addressed as a puzzle. Using the most recent results on exclusive B decays into J/ψ 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. © 2011 American Physical Society.
Momentum distribution of J/ψ in B decays / T. j., Burns; F., Piccinini; Polosa, ANTONIO DAVIDE; V., Prosperi; C., Sabelli. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 83:11(2011). [10.1103/physrevd.83.114029]
Momentum distribution of J/ψ in B decays
POLOSA, ANTONIO DAVIDE;
2011
Abstract
The discrepancy between theory and data in the momentum distribution of slow J/ψ in B decays has been several times addressed as a puzzle. Using the most recent results on exclusive B decays into J/ψ 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. © 2011 American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
