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Observation of Upsilon(4S) decays to pi+ pi- Upsilon(1S) and pi+ pi- Upsilon(2S)

Collaboration
Apr, 2006
7 pages
Published in:
  • Phys.Rev.Lett. 96 (2006) 232001
e-Print:
DOI:
Report number:
  • SLAC-PUB-11817,
  • BABAR-PUB-06-027
Experiments:
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Abstract:
We present the first measurement of Υ(4S)\Upsilon(4S) decays to π+pi−Υ(1S)\pi^+pi^-\Upsilon(1S) and π+pi−Υ(2S)\pi^+pi^-\Upsilon(2S) based on a sample of 230×106\times10^6 Υ(4S)\Upsilon(4S) mesons collected with the BABAR detector. We measure the product branching fractions B(Υ(4S)→π+pi−Υ(1S))×B(Υ(1S)→μ+μ−)=(2.23±0.25stat±0.27sys)×10−6{\cal B}(\Upsilon(4S)\to \pi^+pi^-\Upsilon(1S))\times{\cal B}(\Upsilon(1S)\to\mu^+\mu^-)=(2.23\pm0.25_{stat} \pm0.27_{sys})\times 10^{-6} and B(Υ(4S)→π+pi−Υ(2S))×B(Υ(2S)→μ+μ−)=(1.69±0.26stat±0.20sys)×10−6{\cal B}(\Upsilon(4S)\to \pi^+pi^-\Upsilon(2S))\times{\cal B}(\Upsilon(2S)\to\mu^+\mu^-)=(1.69\pm0.26_{stat}\pm0.20_{sys})\times 10^{-6}, from which we derive the partial widths Γ(Υ(4S)→π+pi−Υ(1S))=(1.8±0.4)\Gamma(\Upsilon(4S)\to \pi^+pi^-\Upsilon(1S))=(1.8\pm0.4)~keV and Γ(Υ(4S)→π+pi−Υ(2S))=(2.7±0.8)\Gamma(\Upsilon(4S)\to \pi^+pi^-\Upsilon(2S))=(2.7\pm0.8)~keV.
Note:
  • 7 pages,, 3 figures,submitted to Physical Review Letters Report-no: BABAR-PUB-06/027, SLAC-PUB-11817
  • 13.25.Gv
  • 14.40.Gx
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • Upsilon(10570): hadronic decay
  • Upsilon(9460): leptonic decay
  • Upsilon(10020): leptonic decay
  • muon: pair production
  • channel cross section: branching ratio