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| Journal Article | PreJuSER-18580 |
; ; ;
2011
Springer
Berlin
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Please use a persistent id in citations: http://hdl.handle.net/2128/10281 doi:10.1140/epja/i2011-11120-6
Abstract: The assumption that the newly observed charged bottomonia states Z(b)(10610) and Z(b)(10650) are of molecular nature is confronted with the measured invariant-mass distributions for the transitions of the Y(5S) to the final states h(b)pi(+)pi(-) and h(b)(2P)pi(+)pi(-). It is shown that the assumption that the Z(b)(10610) and Z(b)(10650) are B (B) over bar* + c.c. and B*(B) over bar* bound states, respectively, with very small binding energies is consistent with the data. The calculation is based on a power counting for bottom meson loops, which is explicitly given up to two-loop in the framework of a nonrelativistic effective-field theory. We also show that if the Z(b) states are of molecular nature, then the data should not be analyzed by using a Breit-Wigner parametrization.
Keyword(s): effective field theory: nonrelativistic ; meson: bound state ; Upsilon(10870): mass ; binding energy ; quarkonium: mass spectrum ; Breit-Wigner ; meson: exotic ; Z/b(10610) ; Z/b(10650) ; meson meson: molecule ; bottom meson ; higher-order: 2
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