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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒 | |
| dc.contributor.author | Jheng-Hao Chen | en |
| dc.contributor.author | 陳政豪 | zh_TW |
| dc.date.accessioned | 2021-06-12T17:59:24Z | - |
| dc.date.available | 2008-02-18 | |
| dc.date.copyright | 2008-02-18 | |
| dc.date.issued | 2007 | |
| dc.date.submitted | 2008-01-28 | |
| dc.identifier.citation | [1] http://www.frankkendig.com/nobel.htm
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27260 | - |
| dc.description.abstract | We observe the decay B0 to p pbar K∗0 with a branching fraction of (1.18 + 0.29 − 0.25 +- 0.11) * 10^−6. The statistical significance is 7.2 sigma for the signal in the low p pbar mass region. We study the decay dynamics of p pbar K∗0 and compare with p pbar K∗+. The K∗0 meson is found to be almost 100% polarized (with a fraction of (101 +- 13 +- 3)% in the helicity zero state), while the K∗+ meson has a (32 +- 17 +- 9)% fraction in the helicity zero state. The direct CP asymmetries for B0 to p pbar K∗0 and B+ to p pbar K∗+ are measured to be −0.08 +- 0.20 +- 0.02 and −0.01 +- 0.19 +- 0.02, respectively. We also study the characteristics of the low mass p pbar enhancements near threshold and the related angular distributions. These results are obtained from a 492 fb^−1 data sample collected near the Y(4S) resonance with the Belle detector at the KEKB asymmetric energy e+ e− collider. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-12T17:59:24Z (GMT). No. of bitstreams: 1 ntu-96-R94222060-1.pdf: 2127262 bytes, checksum: bf7464a7ff5fbf4c5c5339a27c310644 (MD5) Previous issue date: 2007 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 The History of Particle Physics 1 1.2 Quarks 2 1.3 The Standard Model 3 1.4 Properties of B Mesons 4 1.5 Baryonic B Meson Decays 6 2 B Factory 9 2.1 Introduction 9 2.2 The KEKB Accelerator 11 2.3 The Belle Detector 13 2.3.1 Silicon Vertex Detector(SVD) 14 2.3.2 Extreme Forward Calorimeter(EFC) 15 2.3.3 Central Drift Chamber(CDC) 17 2.3.4 Aerogel Cherenkov Counter(ACC) 18 2.3.5 Time of Flight(TOF) 19 2.3.6 Electromagnetic Calorimeter(ECL) 20 2.3.7 KL and Muon Detector(KLM) 21 3 The Study of B to p pbar K∗ Modes 23 3.1 Introduction 23 3.2 Event Selection 24 3.2.1 Charged Proton, Kaon and Pion Selection 24 3.2.2 Neutral Kaon Selection 24 3.2.3 K∗ reconstruction 24 3.2.4 B reconstruction 25 3.3 Background Suppression 26 3.3.1 Charm Background Veto 26 3.3.2 Rare B Background Veto 26 3.3.3 Continuum Background Suppression 26 3.3.4 Multiple Counting 27 3.3.5 Efficiency Breakdown List 27 3.4 Sub-decay Branching Fraction 27 3.5 Fitting 28 3.5.1 Likelihood Fit 28 3.5.2 Probability Density Function 28 3.6 Measurements 29 3.6.1 Branching Fraction 29 3.6.2 CP Asymmetry 32 3.6.3 Angular Distribution 32 3.6.4 Helicity Distribution 32 3.6.5 Conclusions 35 4 Systematic Uncertainty 47 4.1 Branching Fraction 47 4.2 H0 51 5 Validity Check 53 5.1 3D Fit 53 5.2 Branching Fraction 53 5.3 Charge Asymmetry Ach 54 | |
| dc.language.iso | en | |
| dc.subject | B介子 | zh_TW |
| dc.subject | 衰變 | zh_TW |
| dc.subject | Belle | en |
| dc.subject | B meson | en |
| dc.subject | decay | en |
| dc.subject | polarization | en |
| dc.title | B介子衰變至p pbar K*0的發現與K*0衰變的完全偏極 | zh_TW |
| dc.title | Observation of B0 to p pbar K∗0 with a large K∗0 polarization at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 侯維恕,熊怡,張寶棣,王正祥 | |
| dc.subject.keyword | B介子,衰變, | zh_TW |
| dc.subject.keyword | B meson,decay,polarization,Belle, | en |
| dc.relation.page | 59 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-01-29 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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