B meson spectroscopy
Abstract
We study the B meson spectroscopy allowing the mixture of conventional P wave quark-antiquark states and four-quark components. A similar picture was used to describe the new DJ and DsJ open charm mesons. The four-quark components shift the masses of some positive parity BsJ states below their corresponding isospin preserving two-meson threshold and therefore they are expected to be narrow. Electromagnetic decay widths are analyzed.
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