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Article overview
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Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state | Smruti Patel
; P C Vinodkumar
; | Date: |
3 Jun 2016 | Abstract: | We have done the exploratory study of bottom tetraquarks ($[bqar b ar
q];{qin u,d}$) in the diquark-antidiquark framework with the inclusion of spin
hyperfine, spin-orbit and tensor components of the one gluon exchange
interaction. Our focus here is on the $Y_b$(10890) and other exotic states in
the bottom sector. We have predicted some of the bottom counterparts to the
charm tetraquark candidates. Our present study shows that if $Z_b(10610)$ and
$Z_b(10650)$ are diquark-diantiquark states then they have to be first radial
excitations only and we have predicted $Z_b(10650)$ state as first radial
excitation of tetraquark state $X_b$ (10.143-10.230). We have identified $X_b$
state with $J^{PC}= 1^{+-}/0^{++}$ as being the analogue of $Z_c(3900)$. An
observation of the $X_b$ will provide a deeper insight into the exotic hadron
spectroscopy and is helpful to unravel the nature of the states connected by
the heavy quark symmetry. We particularly focus on the lowest P wave $[bq][ar
bar q]$ states with $J^{PC}=1^{--}$ by computing their leptonic, hadronic and
radiative decay widths to predict the status of still controversial
$Y_b$(10890) state. Apart from this, we have also shown here the possibility of
mixing of P wave states. In the case of mixing of $1^{--}$ state with different
spin multiplicities, we found that predicted masses of the mixed P states
differ from $Y_b$(10890) state only by $pm20$ MeV energy difference which can
be helpful to resolve further the structure of $Y_b$(10890). | Source: | arXiv, 1606.1047 | Services: | Forum | Review | PDF | Favorites |
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