Observation of an enhancement ine+e−→Υ(1S)π+π−,Υ(2S)π+π−, andΥ(3S)

Chen, K.-F.; Hou, W.-S.; Adachi, I.; Aihara, H.; Aushev, T.; Bakich, A. M.; Balagura, V.; Bay, A.; Belous, K.; Bhardwaj, V.; Bischofberger, M.; Bondar, A.; Bozek, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, M.-C.; Chang, P.; Chao, Y.; Chen, A.; Chen, P.; Cheon, B. G.; Chiang, C.-C.; Chistov, R.; Cho, I.-S.; Choi, Y.; Dalseno, J.; Drutskoy, A.; Eidelman, S.; Epifanov, D.; Gabyshev, N.; Goldenzweig, P.; Ha, H.; Han, B.-Y.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Hoshi, Y.; Hsiung, Y. B.; Hyun, H. J.; Iijima, T.; Inami, K.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Julius, T.; Kah, D. H.; Kang, J. H.; Katayama, N.; Kiesling, C.; Kim, H. O.; Kim, Y. I.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Korpar, S.; Križan, P.; Krokovny, P.; Kwon, Y.-J.; Kyeong, S.-H.; Lange, J. S.; Lee, S.-H.; Li, J.; Liu, C.; Liu, Y.; Liventsev, D.; Louvot, R.; MacNaughton, J.; Matyja, A.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nishida, S.; Nishimura, K.; Nitoh, O.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Okuno, S.; Pakhlova, G.; Park, H.; Park, H. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Ryu, S.; Sahoo, H.; Sakai, K.; Sakai, Y.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Seidl, R.; Senyo, K.; Shapkin, M.; Shen, C. P.; Shiu, J.-G.; Shwartz, B.; Smerkol, P.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S.; Teramoto, Y.; Trabelsi, K.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Ushiroda, Y.; Varner, G.; Varvell, K. E.; Vervink, K.; Wang, C. H.; Wang, M.-Z.; Wang, P.; Watanabe, Y.; Wedd, R.; Wicht, J.; Won, E.; Yabsley, B. D.; Yamashita, Y.; Yuan, C. Z.; Zhang, Z. P.; Zhulanov, V.; Zupanc, A.; Zyukova, O.

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American Physical Society, Physical Review D, 9(82)

DOI: 10.1103/physrevd.82.091106

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Observation of an enhancement ine+e−→Υ(1S)π+π−,Υ(2S)π+π−, andΥ(3S)

Journal article published in 2010 by K.-F. Chen, W.-S. Hou, I. Adachi, H. Aihara, T. Aushev, A. M. Bakich, V. Balagura, A. Bay, K. Belous, V. Bhardwaj, M. Bischofberger, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka and other authors.

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Abstract

We measure the production cross sections for e+e -→Υ(1S)π+π-, Υ(2S)π+π-, and Υ(3S) π+π- as a function of √s between 10.83 GeV and 11.02 GeV. The data consist of 8.1fb-1 collected with the Belle detector at the KEKB e+e- collider. We observe enhanced production in all three final states that does not agree well with the conventional Υ(10860) line shape. A fit using a Breit-Wigner resonance shape yields a peak mass of [10888.4-2.6+2.7(stat)±1.2(syst)]MeV/c2 and a width of [30.7-7.0+8.3(stat)±3.1(syst)]MeV/c2.

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Observation of an enhancement ine+e−→Υ(1S)π+π−,Υ(2S)π+π−, andΥ(3S)

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