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Mass Spectrum of Heavy Quarkonium Hybrids | | Wei Chen
; R. T. Kleiv
; T. G. Steele
; B. Bulthuis
; D. Harnett
; J. Ho
; T.Richards
; Shi-Lin Zhu
; | | Date: |
16 Apr 2013 | | Abstract: | We have extended the calculation of the correlation functions of heavy
quarkonium hybrid operators with various $J^{PC}$ quantum numbers to include
QCD condensates up to dimension six. In contrast to previous analyses which
were unable to optimize the QCD sum-rules for certain $J^{PC}$, recent work has
shown that inclusion of dimension six condensates stabilizes the hybrid sum
rules and permits reliable mass predictions. In this work we have investigate
the effects of the dimension six condensates on remaining channels. After
performing the QCD sum rule analysis, we update the mass spectra of charmonium
and bottomonium hybrids with exotic and non-exotic quantum numbers. We identify
that the negative-parity states with $J^{PC}=(0, 1, 2)^{-+}, 1^{--}$ form the
lightest hybrid supermultiplet while the positive-parity states with
$J^{PC}=(0, 1)^{+-}, (0, 1, 2)^{++}$ belong to a heavier hybrid supermultiplet,
confirming the supermultiplet structure found in other approaches. The hybrid
with $J^{PC}=0^{--}$ has a much higher mass which may suggest a different
excitation of the gluonic field compared to other channels. In agreement with
previous results, we find that the $J^{PC}=1^{++}$ charmonium hybrid is
substantially heavier than the X(3872), which seems to preclude a pure
charmonium hybrid interpretation for this state. | | Source: | arXiv, 1304.4522 | | Services: | Forum | Review | PDF | Favorites | |
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