First evidence for a charm radial excitation, D*-prime

Using D ∗+ mesons exclusively reconstructed in the DELPHI detector at LEP, an excess of 66±14(stat.) events is observed in the D ∗+ π + π − final state with a mass of 2637±2(stat.)±6(syst.) MeV/ c 2 and a full width smaller than 15 MeV/ c 2 (95% C.L.). This signal is compatible with the expected decay of a radially excited D ∗′ ( J P =1 − ) meson.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
D*(2010): excited state
mass: width
D*(2010): particle identification
mass spectrum: (D*(2010) pi+ pi-)
DELPHI
experimental results

References(23)

Figures(0)

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