Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays

Preprint

31 October 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/0309032

Abstract

We report the observation of a narrow charmonium-like state produced in the exclusive decay process B+ -> K+ pi+pi- J/psi. This state, which decays into pi+pi- J/psi, has a mass of 3872.0+-0.6(stat)+-0.5(syst) MeV, a value that is very near the M_D + M_D* mass threshold. The results are based on an analysis of 152M B-Bbar events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The statistical significance of the signal is in excess of 10 sigma.

Keywords

NARROW CHARMONIUM LIKE
CHARMONIUM LIKE STATE
LIKE STATE
PI J/PSI
DECAYS
M_D

All Related Versions

Version 1, 2003-09-08, ArXiv
Version 2, 2003-10-31, ArXiv
Published version: Physical Review Letters, 91 (26), 262001.

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