A case for hidden b(b)over-bar tetraquarks based on e(+)e(-) -> b(b)over-bar cross section between root s=10.54 and 11.20 GeV

作者：Ali Ahmed^*; Hambrock Christian; Ahmed Ishtiaq; Aslam M Jamil

来源：Physics Letters B, 2010, 684(1): 28-39.

DOI：10.1016/j.physletb.2009.12.053

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.

• 出版日期2010-2-1