Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
The Belle Collaboration: K.Abe, et al
TL;DR
This paper reports the first observation of a narrow charmonium state near the D D* threshold in B+ decays, providing new insights into charmonium spectroscopy.
Contribution
The discovery of a new narrow charmonium state produced in B+ decays near the D D* threshold is reported for the first time.
Findings
Mass of the new state is 3871.8 MeV
State decays into pi+pi-J/psi
Observation based on 152 million BBbar events
Abstract
We report the first observation of a narrow charmmonium 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 3871.8+-0.7(stat)+-0.4(syst) MeV, which is very near the M_D + M_D* mass threshold. The results are based on an analysis of 152M BBbar events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider.
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