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First Evidence for a Charm Radial Excitation, D*'

par Abreu, Pedro;Bertrand, Daniel ; [et al.]
Référence Physics letters. Section B, 426, page (231-242)
Publication Publié, 1998

Article révisé par les pairs

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Résumé :

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/c2 and a full width smaller than 15 MeV/c2 (95% C.L.). This signal is compatible with the expected decay of a radially excited D *′ (JP = 1-) meson. © 1998 Published by Elsevier Science B.V. All rights reserved.