Observation of an enhancement in $e^+e^- \to Υ(1S)π^+ π^-$, $Υ(2S)π^+ π^-$, and $Υ(3S)π^+ π^-$ production around $\sqrt{s}=10.89$ GeV at Belle

Details Observation of an enhancement in $e^+e^- \to Υ(1S)π^+ π^-$, $Υ(2S)π^+ π^-$, and $Υ(3S)π^+ π^-$ production around $\sqrt{s}=10.89$ GeV at Belle Observation of an enhancement in $e^+e^- \to Υ(1S)π^+ π^-$, $Υ(2S)π^+ π^-$, and $Υ(3S)π^+ π^-$ production around $\sqrt{s}=10.89$ GeV at Belle

2008-10-21

arxiv.org/abs/0810.3829v2

Phys.Rev.D82:091106,2010

Physics

High Energy Physics

High Energy Physics - Experiment

Plenary talk at ICHEP08, Philadelphia, USA, July 2008. 5 pages, LaTeX, 2 figures

Scientific paper

10.1103/PhysRevD.82.091106

We measure the production cross sections for $e^+e^- \to \Upsilon(1S)\pi^+\pi^-$, $\Upsilon(2S)\pi^+\pi^-$, and $\Upsilon(3S)\pi^+\pi^-$ as a function of $\sqrt{s}$ between 10.83 GeV and 11.02 GeV. The data consists of 8.1 fb$^{-1}$ collected with the Belle detector at the KEKB $e^+e^-$ collider. We observe enhanced production in all three final states that does not conform well with the conventional $\Upsilon(10860)$ lineshape. A fit using a Breit-Wigner resonance shape yields a peak mass of $[10888.4^{+2.7}_{-2.6} ({\rm stat}) \pm1.2 ({\rm syst})]$ MeV/$c^2$ and a width of $[30.7_{-7.0}^{+8.3} ({\rm stat}) \pm3.1 ({\rm syst})]$ MeV/$c^2$.

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