在 Belle 实验中通过初态辐射对 e+ e- -->π+ π- ψ(2S) 过程中两个共振结构的观测
Observation of two resonant structures in e+ e- -->pi+ pi- psi(2S) via initial-state radiation at Belle.
作者信息
Wang X L, Yuan C Z, Shen C P, Wang P, Adachi I, Aihara H, Arinstein K, Aushev T, Bakich A M, Barberio E, Bedny I, Bhardwaj V, Bitenc U, Blyth S, Bondar A, Bozek A, Bracko M, Brodzicka J, Browder T E, Chang P, Chen A, Chen K-F, Cheon B G, Chiang C-C, Chistov R, Cho I-S, Choi S-K, Choi Y, Dalseno J, Danilov M, Dash M, Drutskoy A, Eidelman S, Epifanov D, Gabyshev N, Go A, Gokhroo G, Ha H, Hayasaka K, Hayashii H, Hazumi M, Heffernan D, Hoshi Y, Hou W-S, Hyun H J, Iijima T, Inami K, Ishikawa A, Ishino H, Itoh R, Iwasaki Y, Kah D H, Kang J H, Kawai H, Kawasaki T, Kichimi H, Kim H O, Kim S K, Kim Y J, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kumar R, Kuo C C, Kuzmin A, Lange J S, Lee J S, Lee M J, Lee S E, Lesiak T, Limosani A, Lin S-W, Liu Y, Liventsev D, Mandl F, McOnie S, Medvedeva T, Miyabayashi K, Miyake H, Miyata H, Mizuk R, Mori T, Nakano E, Nakao M, Nakazawa H, Natkaniec Z, Nishida S, Nitoh O, Noguchi S, Ogawa S, Ohshima T, Okuno S, Olsen S L, Ozaki H, Pakhlov P, Pakhlova G, Palka H, Park C W, Park H, Park K S, Pestotnik R, Piilonen L E, Poluektov A, Sahoo H, Sakai Y, Schneider O, Sekiya A, Sevior M E, Shapkin M, Shibuya H, Shiu J-G, Shwartz B, Singh J B, Sokolov A, Somov A, Stanic S, Staric M, Sumiyoshi T, Takasaki F, Tamai K, Tanaka M, Taylor G N, Teramoto Y, Tikhomirov I, Uehara S, Ueno K, Uglov T, Unno Y, Uno S, Urquijo P, Varner G, Villa S, Vinokurova A, Wang C C, Wang C H, Watanabe Y, Won E, Yabsley B D, Yamaguchi A, Yamashita Y, Yamauchi M, Zhang C C, Zhang Z P, Zhilich V, Zhulanov V, Zupanc A
机构信息
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, PR China.
出版信息
Phys Rev Lett. 2007 Oct 5;99(14):142002. doi: 10.1103/PhysRevLett.99.142002. Epub 2007 Oct 1.
The cross section for e+ e- --> pi+ pi- psi(2S) between threshold and sqrt[s]=5.5 GeV is measured using 673 fb(-1) of data on and off the Upsilon(4S) resonance collected with the Belle detector at KEKB. Two resonant structures are observed in the pi+ pi- psi(2S) invariant-mass distribution, one at 4361 +/- 9 +/- 9 MeV/c2 with a width of 74 +/- 15 +/- 10 MeV/c2, and another at 4664 +/- 11 +/- 5 MeV/c2 with a width of 48 +/- 15 +/- 3 MeV/c2, if the mass spectrum is parametrized with the coherent sum of two Breit-Wigner functions. These values do not match those of any of the known charmonium states.
利用KEKB的Belle探测器收集的673 fb⁻¹ 的Υ(4S)共振态上下的数据，测量了在阈值和质心能量√s = 5.5 GeV之间的e⁺e⁻→π⁺π⁻ψ(2S)的截面。在π⁺π⁻ψ(2S)不变质量分布中观察到两个共振结构，如果用两个布赖特-维格纳函数的相干和对质谱进行参数化，一个位于4361±9±9 MeV/c² ，宽度为74±15±10 MeV/c² ，另一个位于4664±11±5 MeV/c² ，宽度为48±15±3 MeV/c² 。这些值与任何已知的粲夸克偶素态的值均不匹配。
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