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We report a new measurement of the $e^+e^-\to\Upsilon(nS)\pi^+\pi^-$($n=1,2,3$) cross sections at energies from 10.52 to 11.02 GeV using datacollected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$collider. We observe a new structure in the energy dependence of the crosssections; if described by a Breit-Wigner function its mass and width are foundto be $M=(10752.7\pm5.9\,^{+0.7}_{-1.1})\,$MeV/$c^2$ and$\Gamma=(35.5^{+17.6}_{-11.3}\,^{+3.9}_{-3.3})\,$MeV, where the first error isstatistical and the second is systematic. The global significance of the newstructure including systematic uncertainty is 5.2 standard deviations. We alsofind evidence for the $e^+e^-\to\Upsilon(1S)\pi^+\pi^-$ process at the energy10.52 GeV, which is below the $B\bar{B}$ threshold.

Observation of a new structure near 10.75 GeV in the energy dependence of the $e^+e^-\to\Upsilon(nS)\pi^+\pi^-$ ($n=1,2,3$) cross sections