We report the observation of a narrow state decaying into J/ψπ+π- and produced in 220   pb-1 of p̄p collisions at √s=1.96   TeV in the CDF II experiment. We observe 730±90 decays. The mass is measured to be 3871.3±0.7(stat)±0.4(syst)   MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.

Observation of the narrow state X(3872) ---> J / psi pi+ pi- in anti-p p collisions at s**(1/2) = 1.96-TeV

PAGLIARONE, Carmine Elvezio;
2004

Abstract

We report the observation of a narrow state decaying into J/ψπ+π- and produced in 220   pb-1 of p̄p collisions at √s=1.96   TeV in the CDF II experiment. We observe 730±90 decays. The mass is measured to be 3871.3±0.7(stat)±0.4(syst)   MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11580/8651
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