Observation of a narrow charmonium-like state in exclusive $B^\pm \to K^\pm \pi^+ \pi^- J/\psi$ decays - INSPIRE

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Observation of a narrow charmonium-like state in exclusive $B^\pm \to K^\pm \pi^+ \pi^- J/\psi$ decays

Belle

Collaboration

Sep, 2003

10 pages

Published in:

Phys.Rev.Lett. 91 (2003) 262001

e-Print:

hep-ex/0309032 [hep-ex]

DOI:

10.1103/PhysRevLett.91.262001

PDG:

{{\mathit \chi}_{{{c1}}}{(3872)}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}{(1S)}}

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

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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.

Note:

10 pages 4 figures, submitted to Physical Review Letters

electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B+: hadronic decay
B+: branching ratio
charmonium
quarkonium: hadronic decay
J/psi(3100): leptonic decay
quarkonium: mass

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Figures(0)

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