Evidence of a new narrow resonance decaying to χ(c1)γ in Bâχ(c1)γK.
Phys Rev Lett
; 111(3): 032001, 2013 Jul 19.
Article
em En
| MEDLINE
| ID: mdl-23909309
ABSTRACT
We report measurements of Bâχ(c1)γK and χ(c2)γK decays using 772×10(6) BB[over ¯] events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Evidence of a new resonance in the χ(c1)γ final state is found with a statistical significance of 3.8σ. This state has a mass of 3823.1±1.8(stat)±0.7(syst) MeV/c(2), a value that is consistent with theoretical expectations for the previously unseen 1(3)D(2) cc[over ¯] meson. We find no other narrow resonance and set upper limits on the branching fractions of the X(3872)âχ(c1)γ and χ(c2)γ decays.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article