期刊
PHYSICS LETTERS B
卷 684, 期 1, 页码 28-39出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.12.053
关键词
-
资金
- ENSF, Italy
- Trieste, Italy
We Study the spectroscopy and dominant decays of the bottomonium-like tetraquarks (bound diquarks-antidquarks), focusing on the lowest lying P-wave [bq][bq] states Y[bq] (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) over bar cross section in the range of root s = 10.54 to 11.20 GeV. We find that these data are consistent with the presence of an additional b b (b) over bar state Y-[bq] with a mass of 10.90 GeV and a width of about 30 MeV apart from the gamma(5S) and gamma(6S) resonances. A closeup Of the energy region around the Y[bq]-mass may resolve this state in terms of the two mass eigenstates, Y[b.I] and Y[b,h], With a mass difference, estimated as about 6 MeV. We tentatively identify the state Y-[bq](10900) from the R-b-scan with the state Y-b(10890) observed by Belle [2] in the process e(+)e(-) - Y-b(10890) -> T(1S. 2S) pi(+)pi(-) due to their proximity in masses and decay widths. (C) 2010 Elsevier B.V. All rights reserved.
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