Pakhlov P, Adachi I, Aihara H, Arinstein K, Aushev T, Aziz T, Bakich A M, Balagura V, Barberio E, Bedny I, Belous K, Bhardwaj V, Bitenc U, Bondar A, Bozek A, Bracko M, Browder T E, Chao Y, Chen A, Chen K-F, Chen W T, Cheon B G, Chistov R, Choi Y, Dalseno J, Danilov M, Dash M, Drutskoy A, Eidelman S, Golob B, Ha H, Hayasaka K, Hazumi M, Heffernan D, Hoshi Y, Hou W-S, Hsiung Y B, Hyun H J, Iijima T, Ikado K, Inami K, Ishikawa A, Ishino H, Itoh R, Iwasaki M, Iwasaki Y, Kah D H, Kang J H, Kapusta P, Katayama N, Kawai H, Kawasaki T, Kichimi H, Kim Y J, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kumar R, Kuo C C, Kwon Y-J, Lange J S, Lee M J, Lee S E, Lesiak T, Limosani A, Lin S-W, Liu Y, Liventsev D, Mandl F, Matyja A, Medvedeva T, Miyake H, Miyata H, Miyazaki Y, Mizuk R, Moloney G R, Mori T, Nakano E, Nakao M, Natkaniec Z, Nishida S, Nitoh O, Noguchi S, Ogawa S, Ohshima T, Okuno S, Olsen S L, Ozaki H, Pakhlova G, Palka H, Park C W, Peak L S, Pestotnik R, Piilonen L E, Sahoo H, Sakai Y, Schneider O, Seidl R, Senyo K, Sevior M E, Shapkin M, Shen C P, Shibuya H, Shiu J-G, Singh J B, Somov A, Stanic S, Staric M, Sumiyoshi T, Suzuki S, Takasaki F, Tamai K, Tamura N, Tanaka M, Taylor G N, Teramoto Y, Tikhomirov I, Uehara S, Ueno K, Uglov T, Unno Y, Uno S, Urquijo P, Usov Y, Varner G, Vervink K, Wang C H, Wang P, Wang X L, Watanabe Y, Won E, Yabsley B D, Yamashita Y, Yamauchi M, Yuan C Z, Zhang C C, Zhang Z P, Zhilich V, Zupanc A, Zyukova O
Institute for Theoretical and Experimental Physics, Moscow.
Phys Rev Lett. 2008 May 23;100(20):202001. doi: 10.1103/PhysRevLett.100.202001. Epub 2008 May 19.
We report a study of the processes e+e- -->J/psiDDover. In J/psiDD[over]* we observe a significant enhancement in the DD[over] invariant mass spectrum, which we interpret as a new charmoniumlike state and denote X(4160). The X(4160) parameters are M=(4156(-20)+25+/-15) MeV/c2 and Gamma=(139(-61)+111+/-21) MeV. We also report a new measurement of the X(3940) mass and width: M=(3942(-6)+7+/-6) MeV/c2 and Gamma=(37(-15)+26+/-8) MeV. The analysis is based on a 693 fb(-1) data sample recorded near the Upsilon(4S) resonance by the Belle detector at the KEKB asymmetric-energy collider.
我们报告了一项关于过程e+e-→J/ψDD̅的研究。在J/ψDD̅中，我们在DD̅不变质量谱中观察到一个显著增强，我们将其解释为一种新的类粲夸克偶素态，并记为X(4160)。X(4160)的参数为M=(4156(-20)+25±15)MeV/c2和Γ=(139(-61)+111±21)MeV。我们还报告了对X(3940)质量和宽度的新测量结果：M=(3942(-6)+7±6)MeV/c2和Γ=(37(-15)+26±8)MeV。该分析基于KEKB非对称能量对撞机上的Belle探测器在Upsilon(4S)共振附近记录的693 fb(-1)数据样本。
