QCD sum rules study of the meson Z^+(4430)

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dc.creatorLee, Su Houng
dc.creatorMihara, Antonio
dc.creatorNavarra, Fernando S.
dc.creatorNielsen, Marina
dc.date2007-10-04
dc.date2008-01-17
dc.date.accessioned2026-07-07T11:37:48Z
dc.date.available2026-07-07T11:37:48Z
dc.descriptionWe use QCD sum rules to study the recently observed meson $Z^+(4430)$, considered as a $D^*D_1$ molecule with $J^{P}=0^{-}$. We consider the contributions of condensates up to dimension eight and work at leading order in $α_s$. We get $m_Z=(4.40\pm0.10) \GeV$ in a very good agreement with the experimental value. We also make predictions for the analogous mesons $Z_{s}$ and $Z_{bb}$ considered as $D_s^*D_1$ and $B^*B_1$ molecules respectively. For $Z_{s}$ we predict $m_{Z_{s}}= (4.70\pm 0.06) {\rm GeV}$, which is above the $D_s^*D_1$ threshold, indicating that it is probably a very broad state and, therefore, difficult to be experimentally seen. For $Z_{bb}$ we predict $m_{Z_{bb}}= (10.74\pm 0.12) {\rm GeV}$, in agreement with quark model predictions.
dc.description2 new figures included. version accepted for publication in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0710.1029
dc.identifierhttp://arxiv.org/abs/0710.1029
dc.identifierPhys.Lett.B661:28-32,2008
dc.identifierdoi:10.1016/j.physletb.2008.01.062
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199335
dc.subjectHigh Energy Physics - Phenomenology
dc.titleQCD sum rules study of the meson Z^+(4430)
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