Measurements of the ${\rm Y}(10860)$ and ${\rm Y}(11020)$ resonances via $\sigma (e^{+}{e}^{-}\to {\rm Y}(n\mathrm{S}){\pi }^{+}{\pi }^{-})$

Abstract

We report new measurements of the total cross sections for $e^{+}{e}^{-}\to {\rm Y}(n\mathrm{S}){\pi }^{+}{\pi }^{-}$ ($n$ = 1, 2, 3) and $e^{+}{e}^{-}\to b\bar{b}$ from a high-luminosity fine scan of the region $\sqrt{s}=10.63$-$11.05$ GeV with the Belle detector. We observe that the ${\rm Y}(n\mathrm{S}){\pi }^{+}{\pi }^{-}$ spectra have little or no non-resonant component and extract from them the masses and widths of ${\rm Y}(10860)$ and ${\rm Y}(11020)$ and their relative phase. We find $M_{10860}=(10891.1\pm 3.2_{-1.7}^{+0.6})$ MeV/$c^2$ and ${\Gamma }_{10860}=(53.7_{-5.6}^{+7.1}{}_{-5.4}^{+1.3})$ MeV and report first measurements $M_{11020}=(10987.5_{-2.5}^{+6.4}{}_{-2.1}^{+9.0})$ MeV/$c^2$, ${\Gamma }_{11020}=(61_{-19}^{+9}{}_{-20}^{+2})$ MeV, and ${\varphi }_{11020}-{\varphi }_{10860}=(-1.0\pm 0.4{}_{-0.1}^{+1.4})$ rad.

University of Cincinnati preprint UCHEP-15-01, submitted to Physical Review D - Rapid Communications

References in corpus (4)

• Big-Bang Nucleosynthesis
• Observation of two charged bottomonium-like resonances in Y(5S) decays
• Observation of anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi- production near the Upsilon(5S) resonance
• First Observation of the Zb0(10610) in a Dalitz Analysis of Y(5S) -> Y(nS) pi0 pi0

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