A case for hidden $b\bar{b}$ tetraquarks based on $e^+e^- \to b\bar{b}$ cross section between $\sqrt{s}=10.54$ and 11.20 GeV - INSPIRE

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A case for hidden $b\bar{b}$ tetraquarks based on $e^+e^- \to b\bar{b}$ cross section between $\sqrt{s}=10.54$ and 11.20 GeV

Nov, 2009

17 pages

Published in:

Phys.Lett.B 684 (2010) 28-39

e-Print:

0911.2787 [hep-ph]

DOI:

10.1016/j.physletb.2009.12.053

Report number:

DESY-09-192

View in:

ADS Abstract Service

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Abstract: (Elsevier)

We study the spectroscopy and dominant decays of the bottomonium-like tetraquarks (bound diquarks–antidiquarks), focusing on the lowest lying P-wave [ b q ] [ b ¯ q ¯ ] states Y [ b q ] (with q = u , d ), having J PC = 1 − − . To search for them, we analyse the BaBar data [1] obtained during an energy scan of the e + e − → b b ¯ cross section in the range of s = 10.54 to 11.20 GeV. We find that these data are consistent with the presence of an additional b b ¯ state Y [ b q ] with a mass of 10.90 GeV and a width of about 30 MeV apart from the ϒ ( 5 S ) and ϒ ( 6 S ) resonances. A closeup of the energy region around the Y [ b q ] -mass may resolve this state in terms of the two mass eigenstates, Y [ b , l ] and Y [ b , h ] , with a mass difference, estimated as about 6 MeV. We tentatively identify the state Y [ b q ] ( 10900 ) from the R b -scan with the state Y b ( 10890 ) observed by Belle [2] in the process e + e − → Y b ( 10890 ) → ϒ ( 1 S , 2 S ) π + π − due to their proximity in masses and decay widths.

Note:

17 pages, 2 figures/ typos removed and text slightly modified/ version identical to the one published in Physics Letters B

12.39.Jh
14.40.Pq
13.66.Bc
13.25.Hw
13.20.Gd
electron positron: annihilation
bottom: pair production
tetraquark
bottomonium: decay modes
bottomonium: hadronic decay

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)
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)
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- Peking U.
)

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(
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)
,
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)

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)

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Ce Meng
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)
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Kuang-Ta Chao
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)
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Antonio Mihara
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)
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)

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