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2009

Analysis of J/psi pi+ pi- and D0 D0-bar pi0 Decays of the X(3872)

Stapleton, Eric Braaten James

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We analyze recent data from the Babar and Belle Collaborations on the X(3872) resonance in the J/psi pi+ pi- and D0 D0-bar pi0 decay channels, taking careful account of the universal features of an S-wave threshold resonance.

Because the line shapes for such a resonance are not integrable functions of the energy, the resonance parameters depend on the prescriptions used to define them.
In recent experimental analyses of the D0 D0-bar pi0 channel, an event near the D*0 D0-bar threshold was assumed to come from D*0 D0-bar or D0 D0*-bar and was therefore assigned an energy above the threshold.
Taking this effect into account, our analysis of the D0 D0-bar pi0 data gives a mass for the X(3872) that is below the D*0 D^0-bar threshold.

Analysis of J/psi pi+ pi- and D0 D0-bar pi0 Decays of the X(3872) · Around

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