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The electromagnetic multipole moments of the charged open-flavor Z_(bar cq) states

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arxiv 1802.07711 v1 pith:PGSNKTQE submitted 2018-02-21 hep-ph hep-exhep-lat

The electromagnetic multipole moments of the charged open-flavor Z_(bar cq) states

classification hep-ph hep-exhep-lat
keywords momentsstateselectromagneticmultipoleopen-flavordistributionmagneticquadrupole
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The electromagnetic multipole moments of the open-flavor $Z_{\bar cq}$ states are investigated by assuming a diquark-antidiquark picture for their internal structure and quantum numbers $J^{PC} = 1^{+-}$ for their spin-parity. In particular, their magnetic and quadrupole moments are extracted in the framework of light-cone QCD sum rule by the help of the photon distribution amplitudes. The electromagnetic multipole moments of the open-flavor $Z_{\bar cq}$ states are important dynamical observables, which encode valuable information on their underlying structure. The results obtained for the magnetic moments of different structures are considerably large and can be measured in future experiments. We obtain very small values for the quadrupole moments of $Z_{\bar cq}$ states indicating a nonspherical charge distribution.

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