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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, vol. 80, p. -

Observation of the Φ (1680) and the Y(2175) in e+e-→Φ π+π

Shen C. P., Yuan C. Z., Wang P., Wang X. L., Adachi I., Aihara H., Arinstein K., Aulchenko V., Bakich A. M., Barberio E., Belous K., Bischofberger M., Bondar A., Bračko M., Browder T. E., Chang P., Chen A., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Crnkovic J., Dalseno J., Danilov M., Dash M., Dungel W., Eidelman S., Epifanov D., Gabyshev N., Garmash A., Goldenzweig P., Ha H., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Kim J. H., Kim Y. I., Kim Y. J., Ko B. R., Korpar S., Kreps M., Križan P., Krokovny P., Kuehn W., Kumar R., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Lesiak T., Li J., Limosani A., Liu C., Liventsev D., Louvot R., Mandl F., Matyja A., McOnie S., Miyabayashi K., Miyata H., Nagasaka Y., Nakano E., Nakao M., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S.

The cross sections for e+e-→Φ π+π- and e+e-→Φ f0(980) are measured from threshold to s=3.0GeV using initial-state radiation. The analysis is based on a data sample of 673fb-1 collected on and below the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. First measurements are reported for the resonance parameters of the Φ (1680) in the Φ π+π- mode: m=(1689±7±10)MeV/c2 and Γ=(211±14±19)MeV/c2. A structure at s=2.1GeV/c2, corresponding to the so called Y(2175), is observed; its mass and width are determined to be (2079±13-28+79)MeV/c2 and (192±23-61+25)MeV/c2, respectively. © 2009 The American Physical Society.