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

by Mr Peter Klassen (Universität Bonn, Helmholtz-Institut füur Strahlen- und Kernphysik, 53115 Bonn, Germany)

Thursday 5 Nov 2015, 12:15 → 14:00 Europe/Berlin

2.003 Besprechungsraum (HISKP Uni Bonn)

http://inspirehep.net/record/627760

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.

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