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

K. -F. Chen

doi:10.1103/PhysRevD.82.091106

paper

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

arXiv:0810.3829 · doi:10.1103/PhysRevD.82.091106

Abstract

We measure the production cross sections for $e^{+} e^{-} \to Υ (1 S) π^{+} π^{-}$ , $Υ (2 S) π^{+} π^{-}$ , and $Υ (3 S) π^{+} π^{-}$ as a function of $s$ 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 $Υ (10860)$ lineshape. A fit using a Breit-Wigner resonance shape yields a peak mass of $[10888. 4_{- 2.6}^{+ 2.7} (stat) \pm 1.2 (syst)]$ MeV/ $c^{2}$ and a width of $[30. 7_{- 7.0}^{+ 8.3} (stat) \pm 3.1 (syst)]$ MeV/ $c^{2}$ .

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

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

Abstract

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Observation of an enhancement in e+e−→Υ(1S)π+π−, Υ(2S)π+π−, and Υ(3S)π+π− production around s​=10.89 GeV at Belle

Abstract

References in corpus (10)

Cited by in corpus (54)

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