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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7305


    Title: 雙光子反應產生KsKs的研究;A study of γγ → KS0 KS0 production at energies of 2.4 - 4.0 GeV at Belle
    Authors: 陳婉婷;Wan-Ting Chen
    Contributors: 物理研究所
    Keywords: 雙光子;量子色動力學;pQCD;two-photon;charmonium
    Date: 2006-11-21
    Issue Date: 2009-09-22 10:54:48 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本論文測量雙光子反應γγ→KS0 KS0 反應的截面積,其中雙光子質心能量介於2.4GeV 至4.0GeV,Ks 的散射角θ*在|cosθ*|<0.6 範圍之內。本論文數據來自位於日本筑波市文部省高能物理加速器研究機構內之正負電子對撞機產生之雙光子事件,其總亮度為397.6fb-1。 本論文利用Monte-Carlo 事件模擬找出挑選KS0 的最佳分析方法,並減去背景事件所佔的比率,得到精確的截面積與角度分佈結果。本實驗結果得到在雙光子質心能量介於2.4GeV 至4.0GeV 之間,其截面積與不變質量的-10.5±0.6±0.4 次方成正比,此為目前能量不適合驗 證微擾量子色動力學對粒子生成機制描述的理論(包括handbag 模型與雙夸克對模型)之證據。但是從與γγ→K+K-截面積比較後,發現其比值下降之趨勢完全無法由handbag 模型解釋,所以可得知不管是目前的能量或是更高的能量,handbag 模型的貢獻完全不需要被考慮。本論文成功排除handbag 模型的貢獻。 在γγ→KS0 KS0 反應我們亦觀測到χc0 和χc2 的訊號。其雙光子寬度與衰變至KS0 KS0 的乘積為 Γγγ(χc0)B(χc0→KsKs)=7.00±0.65±0.66 eV Γγγ(χc2)B(χc2→KsKs)=0.31±0.05±0.03 eV K0S K0S production in two-photon collisions is measured using data corresponding to 397.6 fb−1 integrated luminosity collected with the BELLE detector at the KEKB e+e− collider. The cross section and angular distribution are measured in the two-photon center-of-mass energy (W) range between 2.4 GeV< W <4.0 GeV and | cos θ∗| < 0.6. A sin−4 θ∗ behavior of the cross section in 2.4 GeV< W <4.0 GeV is observed. Signals of χc0 and χc2 are also observed.
    Appears in Collections:[物理研究所] 博碩士論文

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