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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/47010

    Title: 參與日本高能實驗「B介子工廠」與「超級B介子工廠」國際合作研究(I)---真空與粒子;Vacuurn and Paticles
    Authors: 陳鎰鋒
    Contributors: 物理學系
    Keywords: 真空;粒子生成;量子色動力學;雙光子物理;粒子治療;vacuum;particle creation;QCD;two-photon physics;particle therapy;物理類
    Date: 2010-08-01
    Issue Date: 2011-07-13 16:23:38 (UTC+8)
    Publisher: 行政院國家科學委員會
    Abstract: 正負電子對撞機與強子對撞機相比,是研究量子色動力學(QCD)絕佳工具,加上多數強子透過強作用由真空產生,因此Belle 實驗是目前探索真空與粒子關係最佳選擇。中大高能組累積多年雙光子物理經驗,加上對粲粒子如何由夸克變成介子的瞭解,在此計畫中嘗試縮小時空尺度到膠子分裂成夸克對,或夸克偶合成強子的大小,由Belle 實驗數據中比較不同反應過程之間相似及相異之處,藉此瞭解能量如何透過光子或膠子在真空中激發出夸克對,而夸克又如何偶合成強子。本年度計畫重心在γγ → ΡΡπ +π − 及e+e− →γ * → D*−D+π +π − 之比較,初步分析己見兩者之間的相似性及差異性。但為配合Belle 團隊策略,初步目標以各自形成論文,儘快對外發表。等論文各自發表後,再將兩篇不同反應過程合併討論,以瞭解粒子自真空產生過程。另外預期γγ →ηη ,e+e− → D(*)D*(*) 及π γγ Κ Κ → os 論文將於本年度內送外發表,可能γγ → ΡΡπ o 或γγ →ηη / 也將進入分析階段。在中澤秀介博士的努力下,中大負起Belle 實驗中觸發系統品質監控,所有數據重新整理及Belle grid 運行,這些服務性工作對Belle 實驗整體而言都很重要。同時為配合國內醫界在粒子治療的需求,中大高能組結合國內其他單位合作研製劑量量測系統。初步原型已經電子束流測試,證實性能正常。本年度將大幅提昇探測器及讀出系統性能,更趨近終極目標,預期成品將運送國外實地以質子束流測試。Electron-positron collider provides a much better platform for QCD studies than hadron colliders, and most hadrons are created from Vacuum via strong interactions. Therefore, Belle experiment should be the best choice to study interplay between Vacuum and particles. Experimental HEP group at NCU has many years experience in two-photon physics and Charm fragmentation studies. In this proposal, we try to focus on space-time structure down the size as splitting of gluon into quarks or quarks pairing as hadron. From data collected by Belle experiment, we shall compare similarities and differences among different reaction processes in particle creations. Through comparisons, one may understand how energy creates quarks from Vacuum via photon(s) or gluons, and how quarks are paired into hadron. Main theme e of this year study concentrates on comparison of γγ → ΡΡπ +π − and γ π π e + e− → * → D*−D+ + − two reactions. Preliminary analysis has shown their similarities and differences which shall help us to understand how quarks are created from Vacuum. These two topics shall be prepared as separated papers and published. Then their results will be put together and compared in order to understand rules followed in particle creation processes. In addition to these analyses γγ →ηη , γγ → KoK mπ ± s and D*−Doπ + three papers are expected to be published this year and another two-photon physics γγ →ηη / or γγ → PPπ o will enter its analysis stage as well. With great efforts from Dr Hideyuki Nakazawa, NCU group has taken charges of trigger monitoring and grand data processing in Belle experiment. Both of them are important to Belle data and belong to service natures. They are important contributions from a relative small group like NCU. Recent years, hospitals in Taiwan are planning or have scheduled for their particle therapy facilities. New facility needs “custom-designed” dose measurement system. HEP group at NCU combines efforts from other groups is developing detector system for dose measurement at future particle therapy facilities. A very first prototype has been built and tested at CGMH. Its performance shows normal characteristics. Works this year will be improvements in detector design and performance, electronics and DAQ, push overall performances to their limits. Prototypes are expected to be tested with electron beam at CGMH (Taiwan) or with proton beam at NCC-east (Japan). 研究期間:9908 ~ 10007
    Relation: 財團法人國家實驗研究院科技政策研究與資訊中心
    Appears in Collections:[物理學系] 研究計畫

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