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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒 | |
| dc.contributor.author | Sheng-Wen Lin | en |
| dc.contributor.author | 林盛文 | zh_TW |
| dc.date.accessioned | 2021-06-13T04:44:45Z | - |
| dc.date.available | 2006-10-20 | |
| dc.date.copyright | 2006-07-20 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-17 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33514 | - |
| dc.description.abstract | We report improved measurements of branching fractions for B→Kπ, B→ ππ and B → KK decays based on a data sample of 447 million BB pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e- storage ring. This data sample is almost five times larger than the sample previously used. We also report the ratios of partial widths for B →Kπ and ππ decays. The values obtained Rc = 1.08 +- 0.06 +- 0.07 and Rn = 1.07 +- 0.08 +- 0.08 are consistent with Standard Model expectations. Clear signals in B+ → K0K+ and B0 → K0K0 are observed with significances of 5.7 σ and 6.0 σ , respectively. The corresponding branching fractions are measured to be B(B+ → K0K+) = (1.23+0.33-0.28 +- 0.07) x 10-6 and B(B0 → K0K0) = (0.88+0.25-0.21 +- 0.09) x 10-6. We also report their partial rate asymmetries: ACP (B+ → K0K+) = 0.133+0.229-0.240 +- 0.003, ACP (B+ → K0π+) = 0.034+-0.032+-0.001 and ACP (B0 → K0K0) = -0.571+0.719-0.647 +-0.013. No signal is observed in the decay B0 → K+K- and we set an upper limit of 2.5 x 10-7 at 90% confidence level.
We also study the B → ηK+π- and B→ ηπ+π- decays using 386 million BB pairs. The measured branching fractions are B(B0 → ηK+π-)= (31.7 +- 1.9+2.2-2.6) x 10-6, where the first error is statistical error and the second one is systematic error. The possible three-body decay of B0→ ηπ+π- and the possible two-body decays of B0 → a+-0 h-+ with a-0 → ηπ- have also been searched for, where h stands for either kaon or pion. No significant signal has been found and we obtain B(B0 → ηπ+π-) < 11.9 x 10-6, B(B0 → a+-0 K-+ ) x B(a-0 → ηπ-) < 1.6 x 10-6 and B(B0 → a+-0 π-+ ) x B(a-0 → ηπ-) < 2.8 x 10-6 for the 90% C.L. upper limits. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T04:44:45Z (GMT). No. of bitstreams: 1 ntu-95-D90222023-1.pdf: 11885644 bytes, checksum: 601fd8cb6deaf6a92a1306f0a3a106ca (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | Introduction 1
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Quark model . . . . . . . . . . . . . . .. . . . .. . 2 1.2.1 Quantum numbers of the quarks . . .. 2 1.2.2 Mesons . . . . . . . . . . . . . . . . . . . . .. . .. 2 1.2.3 Exotic mesons . . . . . . . . . . . . . . . . . . 3 1.3 The Cabibbo-Kobayashi-Maskawa quark-mixing matrix . . 4 1.4 B→hh . . . . . . . . . . . . . . . . . . . .. . . . . . 6 1.4.1 Final state interactions . . . . . . . . . . . . 6 1.4.2 Perturbative QCD . . . . . . . . . . . . . . 11 1.5 B0 →a+0 π- and B0→a+0 K- decays . . . 13 1.5.1 Physical properties of a0 . . . . . . . . . 15 1.5.2 B→a0(980)K and a0(980)π decays . . 15 1.5.3 B →a0(1450)K, a0(1450) π decays . . 17 2 KEK B-Factory and Belle Detector 19 2.1 KEK B-Factory . . . . . . . . . . . . . . . . . . 19 2.2 Belle Detector . . . . . . . . . . . . . . . . . . . 20 2.2.1 Beam-line Magnets near the Interaction Point . . 21 2.2.2 Extreme Forward Calorimeter, EFC . . . 22 2.2.3 Silicon Vertex Detector, SVD . . . . . . 25 2.2.4 Central Drift Chamber, CDC . . . . . . . . 27 2.2.5 Aerogel ^Cerenkov Counter System, ACC . . 28 2.2.6 Time-of-Flight Counters, TOF . . .. . . . 29 2.2.7 Electromagnetic Calorimeter, ECL . .. . 30 2.2.8 Particle Identification of Electrons and Charged Kaons, EID and KID ...31 2.2.9 KL and Muon Detection System, KLM . . 33 3 Data sample and Event Selection 35 3.1 Data sample . . . . . . . . . . . . . . . 35 3.1.1 B→ηKπ and B→ηππ. . .. . . . . . . 35 3.1.2 B→hh . . . . . . . . . . . . . . . . . .. . . . . 35 3.2 Event selection . . . . . . . . . . .. . . . . . . 35 3.2.1 Particle identification . . . . . . . . .. . . 35 3.2.2 Hadron B skim . . . . . . . . . . . . . . . . 37 3.2.3 Event selection . . . . . . . . . . . . . . . . 40 3.2.4 Event shape variables . . . . . . . .. . . . 42 3.3 Continuum background suppression . 48 3.3.1 B→hh . . . . . . . . . . . . . . . . . . . . . . . 48 3.3.2 B→ηKπ and B→ηππ . . . . . . . . . 50 3.4 Likelihood ratio cuts optimization . . . 51 3.4.1 B→hh . . . . . . . . . . . . . . . . . . .. . . . 52 3.4.2 B→ηKπ and B→ηππ . . . . . . . . . 54 4 Signal Extraction 57 4.1 Signal shape . . . . . . . . . . . . . . . . . . . 57 4.2 Consistency Check . . . . . . . . . . .. . . . 57 4.2.1 B→hh . . . . . . . . . . . . . . . . . . . . . . 57 4.2.2 B→ηKπ and B→ηππ . . . . . . . . . 62 4.3 Mbc and ΔE PDF of Background . . 63 4.3.1 B→hh . . . . . . .. . . . . . . . . . . . . . . 63 4.3.2 B→ηhh . . . . . . . . . . . . . . . . . . . . . 63 5 Fitting Method and Results 73 5.1 Maximum Likelihood fit . . . . . . . . . 73 5.1.1 B→hh . . . . . . . . . . . . . . . . . . . . . 74 5.1.2 B→ηKπ and B→ηππ . . . . . . . 74 5.2 Fitting results . . . . . . . . . . . . . . . . . . 74 5.2.1 B→hh . . . . . . . . . . . . . . . . .. . . . . 74 5.2.2 B→ηKπ and B→ηππ . . . . . . . . 80 5.3 2-Body Intermediate States of B→ηhh . 83 5.3.1 Two Body Mass spectra of ηK+π- in the final state . . 83 5.3.2 Two Body Mass spectra of ηπ+π- in the final state . . . 83 5.3.3 B0→a-0 K+ . . . . . . . . . . . . . . . . 83 5.3.4 B0→a+-π0. . . . . . . . . . . . . . . . 84 6 Systematics and Efficiency Correction 89 6.1 Tracking efficiency and systematic error . . 89 6.1.1 η→π+π-π0 mode . . . . . . . . . . . . 89 6.1.2 η→γγmode . . . . . . . . . . . . . . . . . 90 6.1.3 Partial decays of the D* meson . . 91 6.2 π0efficiency and systematic error . . 94 6.2.1 η→γγdecay . . . . . . . . . . . . . . . . . 95 6.2.2 η→3π0 . . . . . . . . . . . . . . . . . .. . . 95 6.2.3 KS reconstruction efficiency . . . . 97 6.3 PID performance . . . . . . . . . . . . . . . 97 6.4 Systematics . . . . . . . . . . . . . . . . . . . 100 6.5 Reconstruction efficiency . . . . . . . . 102 6.5.1 Reconstruction efficiency of B→hh . 102 6.5.2 Reconstruction efficiency of B→ ηhh 103 iii 7 Summary and Conclusion 107 7.1 B→ hh . . . . . . . . . . . . . . . . . . .. . . . 107 7.2 B→ ηhh . . . . . . . . . . . . . . . . . . . . . 109 | |
| dc.language.iso | en | |
| dc.title | B介子稀有衰變之量測（B→hh, B→ηKπ and B→ηππ) | zh_TW |
| dc.title | Study of Charmless Hadronic B→hh, B→ηKπ and B→ηππ Decays at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.coadvisor | 張寶棣 | |
| dc.contributor.oralexamcommittee | 郭榮升,侯維恕,王正祥,何小剛,李湘楠 | |
| dc.subject.keyword | 介子,稀有衰變,高能物理,探測器, | zh_TW |
| dc.subject.keyword | Belle,KEKB,branching fraction,thesis,charmless,hh, | en |
| dc.relation.page | 116 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-18 | |
| 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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