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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 熊怡(Yee Bob Hsiung) | |
| dc.contributor.author | Yu-Chen Tung | en |
| dc.contributor.author | 董育宸 | zh_TW |
| dc.date.accessioned | 2021-06-13T15:23:41Z | - |
| dc.date.available | 2013-08-16 | |
| dc.date.copyright | 2011-08-16 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-10 | |
| dc.identifier.citation | [1] T. Inagaki et al. Measurement of the K0L → π0ν‾ν. Proposal TN001,1996.
[2] H. K. Park et al. Evidence for the decay σ+ → pμ+μ−. Phys. Rev. Lett., 94(2):021801, Jan 2005. [3] D. S. Gorbunov and V. A. Rubakov. On sgoldstino interpretation of HyperCP events. Phys. Rev., D73:035002, 2006. [4] J. K. Ahn et al. New limit on the K0L → π0ν‾ν decay rate. Phys. Rev. D, 74(5):051105, Sep 2006. [5] K. Sakashita, Ph.D. thesis, Osaka University (2005); M. Doroshenko, Ph.D. thesis, SOKENDAI (2004); H. Watanabe, Ph.D. thesis, Saga University (2001). [6] J. K. Ahn et al. Search for the decay K0L → π0ν‾ν. Phys. Rev. Lett., 100(20):201802, May 2008. [7] T. Sumida, Ph.D. thesis, Kyoto University (2008); G. N. Perdue, Ph.D. thesis, University of Chicago (2008). [8] J. K. Ahn et al. Experimental study of the decay K0 L → π0ν‾ν. Phys. Rev. D, 81(7):072004, Apr 2010. [9] H. Morii, Ph.D. thesis, Kyoto University (2010); J. Ma, Ph.D. thesis, University of Chicago (2010). [10] H. Watanabe et al. Neutral beam line to study K0 L → π0ν‾ν decay at the kek 12-gev proton synchrotron. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 545(3):542 – 553, 2005.130 BIBLIOGRAPHY [11] M. Doroshenko et al. Undoped csi calorimeter for the experiment at kekps. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 545 (1-2):278 – 295, 2005. [12] S. Ajimura et al. Measurements of the photon detection inefficiency of calorimeters between 185 and 505 mev. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 435(3):408 – 422, 1999. [13] Y. Tajima et al. Barrel photon detector of the kek experiment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 592(3):261 – 272, 2008. [14] H. Watanabe. K0L beam line for the study of the K0 L → π0ν‾ν decay. PhD thesis, Saga University, 2002. [15] R. Brun et al. Computer code geant 3.21. CERN, Geneva, 1994. [16] Duane A. Dicus. Estimate of the rate of the rare decay π0 → 3γ. Phys. Rev. D, 12(7):2133–2136, Oct 1975. [17] F.A. Berends. The t violating decay of π0 → 3γ. Physics Letters, 16(2):178 – 181, 1965. [18] Elena Perazzi, Giovanni Ridolfi, and Fabio Zwirner. Signatures of massive sgoldstinos at e+e− colliders. Nucl. Phys., B574:3–22, 2000. [19] D. S. Gorbunov and N. V. Krasnikov. Prospects for sgoldstino search at the LHC. JHEP, 07:043, 2002. [20] S. V. Demidov and D. S. Gorbunov. More about sgoldstino interpretation of HyperCP events. JETP Lett., 84:479–484, 2007. [21] D. S. Gorbunov and V. A. Rubakov. Kaon physics with light sgoldstinos and parity conservation. Phys. Rev., D64:054008, 2001. [22] Xiao-Gang He, Jusak Tandean, and G. Valencia. Light Higgs production in hyperon decay. Phys. Rev., D74:115015, 2006.131 BIBLIOGRAPHY [23] H. Albrecht et al. Search for hadronic b → u decays. Physics Letters B, 241(2):278 – 282, 1990. [24] Y. C. Tung et al. Search for a light pseudoscalar particle in the decay K0L → π0π0X. Phys. Rev. Lett., 102(5):051802, Feb 2009. [25] Leo Bellantoni (For the KTeV Collaboration). Search for K0L →π0π0μ+μ− with ktev data. arXiv:0911.4516, 2009. [26] R. Ogata. Search for x in K0L → π0π0X(X → μ+μ−) using back-anti counter at the e391a experiment. Proceedings of Conference KAON09, 2009. [27] M-L Wu. Search for K0L decay to light pseudoscalar sgoldstino at e391a. Master thesis, 2007. [28] J. Nix et al. First search for K0L → π0π0ν‾ν. Phys. Rev. D, 76(1):011101, Jul 2007. [29] H. J. Hyun et al. Search for a low mass particle decaying into μ+μ− in B0 → K∗0X and B0 → ρX at belle. Phys. Rev. Lett., 105(9):091801, Aug 2010. [30] G. D. Barr et al. Search for the decay K0L → 3γ. Physics Letters B, 358(3-4):399 – 404, 1995. [31] Shu-Yu Ho and Jusak Tandean. Kaon decay into three photons revisited. Phys. Rev. D, 82(11):114010, Dec 2010. [32] P. Heiliger, B. McKellar, and L. M. Sehgal. K0 L decay into three photons. Physics Letters B, 327(1-2):145 – 148, 1994. [33] C. N. Yang. Selection rules for the dematerialization of a particle into two photons. Phys. Rev., 77(2):242–245, Jan 1950. [34] Gary J. Feldman and Robert D. Cousins. Unified approach to the classical statistical analysis of small signals. Phys. Rev. D, 57(7):3873–3889, Apr 1998. [35] Y. C. Tung et al. Search for the decay K0 L → 3γ. Phys. Rev. D, 83(3): 031101, Feb 2011.132 BIBLIOGRAPHY [36] http://ktev.fnal.gov/public/ktev.html. [37] Proposal for K0L → π0ν‾ν experiment at j-parc. Available from http://jparc.jp/NuclPart/Proposal 0606 e.html. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37296 | - |
| dc.description.abstract | 本論文研究中性K介子至二個中性π介子以及假想X中性粒子的衰變。X粒子為HyperCP 實驗所提出的未知新粒子。理論計算推測此X粒子可能出現於中性K介子的衰變中。因此我們於KEK-E391a 實驗的數據中探詢X粒子。我們的研究結果顯示並未有X粒子存在的跡象，因此我們給予90%信心水準之衰變上限為 2.4x10-7。
本論文並呈現中性K介子至三個光子的衰變研究。此衰變為電荷共軛破壞，因此衰變分歧率極為小。在KEK-E391a的數據中，此衰變的事件並未發生。我們給予90%信心水準之衰變上限為 7.4x10-8。 | zh_TW |
| dc.description.abstract | We perform a search for a light pseudoscalar particle X in the decay K0L → π0π0X, X → γγ with the E391a detector at KEK-PS. Such a particle with a mass of 214.3 MeV/c2 is suggested by the HyperCP experiment. In the E391a Run-II data, we perform a complete search of the K0L → π0π0X,
X → γγ decay in the X mass region of 194.3–219.3 MeV/c2 and the X lifetime region of τX < 10−9. No evidence for X is found. An upper limit on the product branching ratio for K0L → π0π0X, X → γγ of 2.4 × 10−7 at the 90% confidence level for the 214.3-MeV/c2 X mass. Upper limits on the the branching ratios for other X mass and lifetime regions are also determined. We also perform a search for the charge-conjugation violating decay K0L → 3γ. In the data accumulated in 2005, no event is observed in the signal region. Based on the assumption of K0L → 3γ proceeding via parity-violation, we obtain the single event sensitivity to be (3.23 ± 0.14) × 10−8, and set an upper limit on the branching ratio to be 7.4 × 10−8 at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of K0L → 3γ proceeding via parity-conservation and phase-space are also presented. We also present a new method of the timing calibration and timing simulation for the main barrel detector. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T15:23:41Z (GMT). No. of bitstreams: 1 ntu-100-F94222020-1.pdf: 2394301 bytes, checksum: 55dbc02d9653f2b0608394aa0aa0f7a3 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | I E391a Experiment 2
1 Introduction 4 1.1 Primary Goal of E391a . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Analysis Overview . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Experimental Apparatus 6 2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 The Kaon Beam . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 The E391a Detector . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.1 The CsI calorimeter . . . . . . . . . . . . . . . . . . . . 9 2.3.2 Main Barrel . . . . . . . . . . . . . . . . . . . . . . . . 13 2.3.3 Barrel Charge Veto . . . . . . . . . . . . . . . . . . . . 17 2.3.4 Front Barrel . . . . . . . . . . . . . . . . . . . . . . . . 17 2.3.5 Collar Counters . . . . . . . . . . . . . . . . . . . . . . 19 2.3.6 Back-Anti . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.3.7 Beam Hole Charged Veto . . . . . . . . . . . . . . . . . 24 2.3.8 Charged Veto . . . . . . . . . . . . . . . . . . . . . . . 25 2.3.9 Vacuum System . . . . . . . . . . . . . . . . . . . . . . 27 2.4 Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.4.1 DAQ System . . . . . . . . . . . . . . . . . . . . . . . 29 2.4.2 Triggering . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.4.3 Data Sample . . . . . . . . . . . . . . . . . . . . . . . 32 3 Event Reconstruction 35 3.1 Photon Reconstruction . . . . . . . . . . . . . . . . . . . . . . 35 3.2 Pion Reconstruction . . . . . . . . . . . . . . . . . . . . . . . 37 3.3 Kaon Reconstruction . . . . . . . . . . . . . . . . . . . . . . . 38 i CONTENTS 3.4 Cluster Calibrations . . . . . . . . . . . . . . . . . . . . . . . 39 4 Monte Carlo Simulation 40 4.1 Beam Line Simulation . . . . . . . . . . . . . . . . . . . . . . 40 4.2 K0 L Generation and Decay . . . . . . . . . . . . . . . . . . . . 40 4.3 Decay Simulation . . . . . . . . . . . . . . . . . . . . . . . . . 41 4.3.1 The Decay K0 L → π0π0X . . . . . . . . . . . . . . . . . 42 4.3.2 The Decay K0 L → 3γ . . . . . . . . . . . . . . . . . . . 42 4.3.3 Other Decays of Kaon . . . . . . . . . . . . . . . . . . 44 4.4 Accidental Activity . . . . . . . . . . . . . . . . . . . . . . . . 44 4.5 Monte Carlo Tuning . . . . . . . . . . . . . . . . . . . . . . . 45 II Search for a Hypothetical Pseudoscalar Particle 46 5 Introduction of K0 L → π0π0X 48 5.1 The X Particle . . . . . . . . . . . . . . . . . . . . . . . . . . 48 5.2 Sgoldstino Interpretation . . . . . . . . . . . . . . . . . . . . . 49 5.2.1 Sgoldstino Decays . . . . . . . . . . . . . . . . . . . . . 50 5.2.2 Interpretation of HyperCP events . . . . . . . . . . . . 51 5.2.3 Lifetime of X . . . . . . . . . . . . . . . . . . . . . . . 51 5.2.4 X in Kaon decays . . . . . . . . . . . . . . . . . . . . . 52 5.3 Higgs Interpretation . . . . . . . . . . . . . . . . . . . . . . . 53 6 Selection of K0 L → π0π0X 54 6.1 Analysis Overview . . . . . . . . . . . . . . . . . . . . . . . . 54 6.2 Event Reconstruction . . . . . . . . . . . . . . . . . . . . . . . 54 6.2.1 Vertex Reconstruction . . . . . . . . . . . . . . . . . . 55 6.2.2 Constrained Fit . . . . . . . . . . . . . . . . . . . . . . 56 6.2.3 Reconstruction Results . . . . . . . . . . . . . . . . . . 60 6.3 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.3.1 Signal Region . . . . . . . . . . . . . . . . . . . . . . . 61 6.3.2 Veto Cuts . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.3.3 Kinematic Cuts . . . . . . . . . . . . . . . . . . . . . . 61 6.4 Background Study . . . . . . . . . . . . . . . . . . . . . . . . 66 6.4.1 K0 L → 3π0 Backgrounds . . . . . . . . . . . . . . . . . 66 ii CONTENTS 7 Results of K0 L → π0π0X 71 7.1 K0 L Flux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 7.1.1 Systematic Error . . . . . . . . . . . . . . . . . . . . . 71 7.1.2 Flux values . . . . . . . . . . . . . . . . . . . . . . . . 72 7.2 Signal Acceptance . . . . . . . . . . . . . . . . . . . . . . . . . 72 7.3 Single Event Sensitivity . . . . . . . . . . . . . . . . . . . . . 73 7.4 Data Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 7.5 Signal Extraction . . . . . . . . . . . . . . . . . . . . . . . . . 74 7.5.1 Likelihood Method . . . . . . . . . . . . . . . . . . . . 74 7.5.2 Signal Yield . . . . . . . . . . . . . . . . . . . . . . . . 78 7.6 Uncertainty Estimation . . . . . . . . . . . . . . . . . . . . . . 81 7.7 Upper Limit Determination . . . . . . . . . . . . . . . . . . . 83 7.8 Conclusions and Discussions . . . . . . . . . . . . . . . . . . . 86 7.9 Prospects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 III Search for a C-Violating Decay 90 8 Introduction of K0 L → 3γ 92 8.1 Theoretical Models . . . . . . . . . . . . . . . . . . . . . . . . 92 8.2 Previous Measurement . . . . . . . . . . . . . . . . . . . . . . 93 9 Selection of K0 L → 3γ 94 9.1 Event Reconstruction . . . . . . . . . . . . . . . . . . . . . . . 94 9.2 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 96 9.2.1 Veto Cuts . . . . . . . . . . . . . . . . . . . . . . . . . 96 9.2.2 Kinematic Cuts . . . . . . . . . . . . . . . . . . . . . . 107 9.3 Background Study . . . . . . . . . . . . . . . . . . . . . . . . 108 9.3.1 K0 L → π0π0 Background . . . . . . . . . . . . . . . . . 108 9.3.2 K0 L → 3π0 Background . . . . . . . . . . . . . . . . . . 110 9.3.3 K0 L → 2γ Background . . . . . . . . . . . . . . . . . . 113 9.4 Background Predictions . . . . . . . . . . . . . . . . . . . . . 114 9.4.1 Normalization . . . . . . . . . . . . . . . . . . . . . . . 114 9.4.2 Systematic Error . . . . . . . . . . . . . . . . . . . . . 115 9.4.3 Results of Prediction . . . . . . . . . . . . . . . . . . . 116 iii CONTENTS 10 Results of K0 L → 3γ 118 10.1 K0 L Flux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 10.1.1 Flux values . . . . . . . . . . . . . . . . . . . . . . . . 118 10.2 Signal Acceptances . . . . . . . . . . . . . . . . . . . . . . . . 119 10.3 Single Event Sensitivity . . . . . . . . . . . . . . . . . . . . . 119 10.4 Data Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 10.5 Upper Limit Determination . . . . . . . . . . . . . . . . . . . 121 10.6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 A The KOTO Experiment (J-PARC E14) 124 A.1 Introduction of KOTO . . . . . . . . . . . . . . . . . . . . . . 124 A.2 KOTO Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . 128 | |
| dc.language.iso | en | |
| dc.subject | K介子衰變 | zh_TW |
| dc.title | 中性K介子之稀有衰變及電荷共軛破壞衰變的探尋 | zh_TW |
| dc.title | Searches for the Decays KL→ π0 π0 X and KL → 3γ at
KEK-E391a | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 侯維恕(Wei-Shu Hou),張寶棣(Paoti Chang),王名儒(Min-Zu Wang),陳凱風(Kai-Feng Chen),王正祥(Zheng-Xiang Wang) | |
| dc.subject.keyword | K介子衰變, | zh_TW |
| dc.subject.keyword | kaon,decay, | en |
| dc.relation.page | 133 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-08-11 | |
| 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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