Low-energy universality and the new charmonium resonance at 3870 MeV
2004; American Physical Society; Volume: 69; Issue: 7 Linguagem: Inglês
10.1103/physrevd.69.074005
ISSN1550-7998
AutoresEric Braaten, Masaoki Kusunoki,
Tópico(s)High-Energy Particle Collisions Research
ResumoThe recently discovered narrow charmonium resonance near 3870 MeV is interpreted as a hadronic molecule whose constituents are the charm mesons ${D}^{0}$ and ${D}^{*0}$ or ${D}^{0}$ and ${D}^{*0}.$ Because of an accidental fine-tuning of the molecule to very near the ${D}^{0}{D}^{*0}$ threshold, it has some universal properties that are completely determined by the unnaturally large ${D}^{0}{D}^{*0}$ scattering length a. Its narrow width can be explained by the suppression by a factor of $1/a$ of decay modes other than the decay of a constituent ${D}^{*0}$ or ${D}^{*0}.$ Its production rates are also suppressed by a factor of $1/a.$ A particularly predictive mechanism for generating the large scattering length is the accidental fine-tuning of a P-wave charmonium state to the ${D}^{0}{D}^{*0}$ threshold.
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