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研究生:李明杰
研究生(外文):Ming-Chieh Lee
論文名稱:前置量能器之打靶測試與B+→ωπ+之電腦模擬
論文名稱(外文):Beam Test of the BELLE Extreme Forward Calorimeter at KEK and The Monte Carlo Study of B+→ωπ+
指導教授:王名儒
指導教授(外文):Min-Zu Wang
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:物理學研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2001
畢業學年度:88
語文別:中文
論文頁數:60
中文關鍵詞:前置量能器
外文關鍵詞:EFCB+→ωπ+
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前置量能器(EFC - Extreme Forward Calorimeter)的構想是由臺灣大學高能實驗組所提出,並成為日本國家高能加速器研究機構(KEK)的BELLE偵測器之子系統。經過三年的研發,該偵測器已於今年(1999)五月在日本組裝完成,並成功的運轉中。
在98年的三月,為了EFC的製作,特將還在研發中的整組EFC帶至日本KEK進行實際的打靶測試,其經驗是在製作EFC的重要參考。
隨著BELLE的正式運轉,物理分析將是下一階段的工作重點。吾人以BELLE之GSIM電腦軟體,模擬B+*wp+之衰變模式,其結果顯示應可觀察到此一衰變。

The Extreme Forward Calorimeter (EFC) is successfully running in KEK for BELLE and she is made by the Taiwan BELLE Group. We had a beam test for the prototype EFC at KEK-PS p2 beam line by using beams with energy for 1 to 3 GeV and the prototype EFC was 1/8 of her full scale one. Due to space limitations, the BGO crystals have only 12 radiation lengths. The measured energy resolution is about 7-10% and linearity about 1%.
I also do the physics simulation studies in the B+ * w p+ mode. In my study, 1973 signal events are accepted in 100,00 events, and 75 background events are in 1.92* 106 events. After calculating in the B+ * w p+ mode assumptive branching ratio is 1.0*10-5 and the continue background is more 2.8 times than the signal, the S/N is 1.86%.

Ch 1. Introduction p.1
Ch 2. BELLE and KEK-B p.3
Ch 3. Beam test of EFC at KEK p.19
Ch 4. Spring Beam Test Result p.31
Ch 5. B+→ωπ+ Mode Physics Simulation p.45
Ch 6. Conclusion p.59

[1] M.Z. Wang, H.C. Huang, M.C. Lee, R.S. Lu, K. Ueno, C.H. Wang,
W.S. Hou (1999) Beam Test of the BELLE Extreme Forward Calorimeter at KEK. BELLE Note 272.
KEK B-factory
[2] The Belle Collaboration (1997) BELLE Progress Report. High Energy
Accelerator Reseach Organization (KEK)
EFC Components
[3] LeCroy Manc**..
B to Omega Pi
[3] CLEO Collaboration (1998) Observation of B+ * w p+ and the Search for Related B Decay Modes. CLNS 97/1537 CLEO 97-32
[4] Michael Gronau, Jonathan L. Rosner (1999) New Information on B Decays to Charmless VP Final States. hep-ph/9909478 v3.
trangle garma
[5] Michael Gronau, Jonathan L. Rosner (1999) New Information on B Decays to Charmess VP Final States. TECHNION-PH-99-33 EFI-99-40
hep-ph/9909478
[6] Stanley M. Flatt*, Darrelle O. Huwe, Joseph J. Murray, Janice
Button-Shafer, Frank T. Solmitz, M. Lynn Stevenson, and Charles Wohl (1965) Decay Properties of w Meson. Physics Review vol. 145, Number 4, 1050-1061
[7] G. Kramer, W.F. Palmer (1992) Polarization and CP asymmetries in the decay B *K* y, K* w, and K* r. Physics Letters B 279 (1992) 181-188
[8] Jesse Abram Ernst (1995) First Measurement of the Rate for the Inclusive Radiative Penguin Decay b * sg. PHD Thesis, University of Rochester.

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