在质心能量平方根约为0.6 GeV的正负电子湮灭中产生即时粲偶素。
Production of prompt charmonia in e(+)e(-) annihilation at square root of s approximately equals 0.6 GeV.
作者信息
Abe K, Abe K, Abe T, Adachi I, Ahn Byoung Sup, Aihara H, Akatsu M, Asano Y, Aso T, Aushev T, Bakich A M, Ban Y, Banas E, Behari S, Behera P K, Bondar A, Bozek A, Browder T E, Casey B C K, Chang P, Chao Y, Cheon B G, Chistov R, Choi S-K, Choi Y, Dong L Y, Dragic J, Drutskoy A, Eidelman S, Enari Y, Fang F, Fujii H, Fukunaga C, Fukushima M, Gabyshev N, Garmash A, Gershon T, Gordon A, Guo R, Haba J, Hamasaki H, Handa F, Hara K, Hara T, Hayashii H, Hazumi M, Heenan E M, Higuchi I, Hokuue T, Hoshi Y, Hou S R, Hou W-S, Huang H-C, Igarashi Y, Iijima T, Ikeda H, Inami K, Ishikawa A, Ishino H, Itoh R, Iwasaki H, Iwasaki Y, Jalocha P, Jang H K, Kang J H, Kang J S, Kapusta P, Katayama N, Kawai H, Kawamura N, Kawasaki T, Kichimi H, Kim D W, Kim Heejong, Kim H J, Kim H O, Kim Hyunwoo, Kim S K, Kim T H, Kinoshita K, Kobayashi S, Konishi H, Krokovny P, Kulasiri R, Kumar S, Kuzmin A, Kwon Y-J, Lange J S, Leder G, Lee S H, Liventsev D, Lu R-S, MacNaughton J, Marlow D, Matsubara T, Matsumoto S, Matsumoto T, Mikami Y, Miyabayashi K, Miyake H, Miyata H, Moloney G R, Mori S, Mori T, Nagamine T, Nagasaka Y, Nagashima Y, Nakano E, Nakao M, Nam J W, Natkaniec Z, Neichi K, Nishida S, Nitoh O, Noguchi S, Nozaki T, Ogawa S, Ohshima T, Okabe T, Okuno S, Ostrowicz W, Ozaki H, Pakhlov P, Palka H, Park C S, Park C W, Park H, Park K S, Peters M, Piilonen L E, Root N, Rybicki K, Ryuko J, Sagawa H, Sakai Y, Sakamoto H, Satapathy M, Satpathy A, Schrenk S, Semenov S, Senyo K, Sevior M E, Shibuya H, Shwartz B, Stanic S, Sugi A, Sugiyama A, Sumisawa K, Sumiyoshi T, Suzuki J-I, Suzuki K, Suzuki S, Swain S K, Takahashi T, Takasaki F, Takita M, Tamai K, Tamura N, Tanaka J, Tanaka M, Tanaka Y, Taylor G N, Teramoto Y, Tomoto M, Tomura T, Tovey S N, Trabelsi K, Trischuk W, Tsuboyama T, Tsukamoto T, Uehara S, Ueno K, Unno Y, Uno S, Ushiroda Y, Vahsen S E, Varvell K E, Wang C C, Wang C H, Wang J G, Wang M-Z, Watanabe Y, Won E, Yabsley B D, Yamada Y, Yamaga M, Yamaguchi A, Yamashita Y, Yamauchi M, Yoshida K, Yuan Y, Yusa Y, Zhang C C, Zhang J, Zhao H W, Zheng Y, Zhilich V, Zontar D
机构信息
High Energy Accelerator Research Organization (KEK), Tsukuba.
出版信息
Phys Rev Lett. 2002 Feb 4;88(5):052001. doi: 10.1103/PhysRevLett.88.052001. Epub 2002 Jan 16.
The production of prompt J/psi, psi(2S), chi(c1), and chi(c2) is studied using a 32.4 fb(-1) data sample collected with the Belle detector at Upsilon(4S) and at 60 MeV below the resonance. The yield of prompt J/psi mesons in the Upsilon(4S) sample is compatible with that of continuum production; we set an upper limit B(Upsilon(4S)-->J/psiX) < 1.9 x 10(-4) at the 95% confidence level, and find sigma(e(+)e(-)-->J/psiX) = 1.47 plus/minus 0.10 plus/minus 0.13 pb. The cross sections for prompt psi(2S) and direct J/psi are measured. The J/psi momentum spectrum, production angle distribution, and polarization are studied.
利用在宇普西隆（4S）处以及低于共振态60兆电子伏特时，由 Belle 探测器收集的32.4 飞靶（-1）数据样本，对瞬发 J/ψ、ψ（2S）、χ（c1）和 χ（c2）的产生进行了研究。宇普西隆（4S）样本中瞬发 J/ψ介子的产额与连续谱产生的产额相符；我们在95%置信水平下设定了上限 B（宇普西隆（4S）→J/ψX）< 1.9×10^（-4），并得到σ（e（+）e（-）→J/ψX）= 1.47±0.10±0.13皮靶。测量了瞬发ψ（2S）和直接 J/ψ的截面。研究了 J/ψ的动量谱、产生角分布和极化情况。
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