{"_buckets": {"deposit": "f56eaa91-f1e9-4ea2-9132-50bad02b75db"}, "_deposit": {"created_by": 1, "id": "711", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "711"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00000711", "sets": ["16"]}, "author_link": ["0", "0", "0"], "item_1_biblio_info_21": {"attribute_name": "書誌情報（ソート用）", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2008-09-30", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "item_1_creator_2": {"attribute_name": "著者名", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "LIU, YANG"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_creator_3": {"attribute_name": "フリガナ", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "リュウ, ヤン"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_date_granted_11": {"attribute_name": "学位授与年月日", "attribute_value_mlt": [{"subitem_dategranted": "2008-09-30"}]}, "item_1_degree_grantor_5": {"attribute_name": "学位授与機関", "attribute_value_mlt": [{"subitem_degreegrantor": [{"subitem_degreegrantor_name": "総合研究大学院大学"}]}]}, "item_1_degree_name_6": {"attribute_name": "学位名", "attribute_value_mlt": [{"subitem_degreename": "博士（理学）"}]}, "item_1_description_1": {"attribute_name": "ID", "attribute_value_mlt": [{"subitem_description": "2008515", "subitem_description_type": "Other"}]}, "item_1_description_12": {"attribute_name": "要旨", "attribute_value_mlt": [{"subitem_description": "　　We study the decay modes of \u003ci\u003eB\u003c/i\u003e meson decay to final states including \u003ci\u003eJ/ψ\u003c/i\u003e and\r\n\u003ci\u003eΦ\u003c/i\u003e mesons based on a large amount of data sample at the \u0026upsih;(4S) state collected with\r\nBelle detector in KEKB asymmetric energy \u003ci\u003ee\u003c/i\u003e\u003csup\u003e+\u003c/sup\u003e\u003ci\u003ee\u003c/i\u003e\u003csup\u003e-\u003c/sup\u003e collider.\r\n　　The decay \u003ci\u003eB\u003c/i\u003e\u003csup\u003e0\u003c/sup\u003e → \u003ci\u003eJ /ψΦ\u003c/i\u003e\u003c/sup\u003e is expected to involve W-exchange and final state interac-\r\ntion (FSI) processes. The mechanisms contributing to this decay can be divided into\r\nfour categories: 1) The photo-production; 2) The tri-gluon fusion; 3) The rescattering\u003cbr /\u003eeffect; 4) The \u003ci\u003eω - Φ\u003c/i\u003e mixing. The dominant contribution is from \u003ci\u003eω- Φ\u003c/i\u003e mixing and the\r\nbranching fraction for this decay is estimated to be (1.8 ± 0.3) × 10\u003csup\u003e-7\u003c/sup\u003e.\r\n　　We perform a search for \u003ci\u003eB\u003c/i\u003e\u003csup\u003e0\u003c/sup\u003e → \u003ci\u003eJ /ψΦ\u003c/i\u003e decays using a data sample of 605 fb\u003csup\u003e-1\u003c/sup\u003e\r\n containing 657 × 10\u003csup\u003e6\u003c/sup\u003e \u003ci\u003eBB\u003c/i\u003e\u003c/span\u003epairs.\r\n　　We reconstruct \u003ci\u003eB\u003c/i\u003e mesons from the decays \u003ci\u003eJ/ψ\u003c/i\u003e → \u003ci\u003el\u003csup\u003e+\u003c/sup\u003el\u003csup\u003e-\u003c/sup\u003e (l = e,μ)\u003c/i\u003e and \u003ci\u003eΦ\u003c/i\u003e →\r\n\u003ci\u003eK\u003csup\u003e+\u003c/sup\u003e K\u003csup\u003e-\u003c/sup\u003e\u003c/i\u003e. Events are required to pass a basic hadronic event selection. We identify \u003ci\u003eB\u003c/i\u003e\r\ncandidates using two widely used kinematic variable calculated in the center-of-mass\r\nsystem:the beam-energy constrained mass (\u003ci\u003eM\u003c/i\u003e\u003csmall\u003ebc\u003c/small\u003e \u0026equiv; \u003cbig\u003e\u0026radic;\u003c/big\u003eE\u003csup\u003e2\u003c/sup\u003e\u003csmall\u003ebeam\u003c/small\u003e　―　P\u003csup\u003e2\u003c/sup\u003e\u003csmall\u003eB\u003c/small\u003e) and the energy\r\ndifference (△\u003ci\u003eE\u003c/i\u003e \u0026equiv; \u003ci\u003eE\u003csmall\u003eB\u003c/i\u003e\u003c/small\u003e - \u003ci\u003eE\u003c/i\u003e\u003csmall\u003ebeam\u003c/small\u003e), where \u003ci\u003eE\u003c/i\u003e\u003csmall\u003ebeam\u003c/small\u003e is the beam energy, \u003ci\u003eP\u003csmall\u003eB\u003c/i\u003e\u003c/small\u003e and \u003ci\u003eE\u003csmall\u003eB\u003c/small\u003e\u003c/i\u003e are the\r\nreconstructed momentum and energy of the B\u003csup\u003e0\u003c/sup\u003e candidate. We select \u003ci\u003eB\u003c/i\u003e candidates\r\nwithin the range -0.2 GeV \u003c △\u003ci\u003eE\u003c/i\u003e \u003c 0.3 GeV and 5.27 GeV / \u003ci\u003ec\u003c/i\u003e\u003csup\u003e2\u003c/sup\u003e ＜ \u003ci\u003eM\u003c/i\u003e\u003csmall\u003ebc\u003c/small\u003e \u003c 5.29 GeV / \u003ci\u003ec\u003c/i\u003e\u003csup\u003e2\u003c/sup\u003e\r\nfor final analysis.\r\n　　We study reconstruction efficiency and event selection criteria using a large signal\r\nMonte Calor (MC) sample. To study the background, we use a MC sample corre-\r\nsponding to 3.86 × 10\u003csup\u003e6\u003c/sup\u003egeneric \u003ci\u003eBB\u003c/i\u003e decays (59 times that of real data) that includes\r\nall known \u003ci\u003eB\u003c/i\u003e →　\u003ci\u003eJ/ψX\u003c/i\u003e processes as well as sideband region.\r\n　　The dominant background comes from \u003ci\u003eBB\u003c/i\u003e events with \u003ci\u003eB\u003c/i\u003e decays to \u003ci\u003eJ/ψ\u003c/i\u003e. We\r\n find that the dominant backgrounds come B\u003csup\u003e0\u003c/sup\u003e → \u003ci\u003eJ/ψK\u003c/i\u003e*\u003csup\u003e0\u003c/sup\u003e(892)[→\u003ci\u003eK\u003c/i\u003e\u003csup\u003e-\u003c/sup\u003eπ\u003csup\u003e+\u003c/sup\u003e] and\u003cbr /\u003eB\u003csup\u003e0-\u003c/sup\u003e → \u003ci\u003eJ/ψK\u003c/i\u003e\u003csmall\u003e1\u003c/small\u003e(1270)[→ \u003ci\u003eK\u003c/i\u003e\u003csup\u003e-\u003c/sup\u003eπ\u003csup\u003e+\u003c/sup\u003eπ\u003csup\u003e0/-\u003c/sup\u003e]. In both cases, a pion is misidentified as a kaon,\r\nand in the latter case, the other pion is missed. The former has a peak at △\u003ci\u003eE\u003c/i\u003e ～0.1～\u003cbr /\u003eGeV, while the latter has a broad peak in the negative △\u003ci\u003eE\u003c/i\u003e region. The remaining\r\nbackground is due to random combinations of \u003ci\u003eJ/ψ\u003c/i\u003eand \u003ci\u003eΦ\u003c/i\u003e candidates and does not\r\nhave structure in the △\u003ci\u003eE\u003c/i\u003e distribution (referred to as combinatorial background).\r\n　　The signal yield is extracted by performing an unbinned extended maximum-\r\nlikelihood fit to the △\u003ci\u003eE\u003c/i\u003e distribution of candidate events. The signal PDF is mod-\r\neled by a sum of two Gaussians. The background PDFs are two Gaussians for the\r\n\u003ci\u003eJ/ψK\u003c/i\u003e\u003csmall\u003e1\u003c/small\u003e component, a bifurcated Gaussian for the \u003ci\u003eJ/ψK\u003c/i\u003e\u003csup\u003e*0\u003c/sup\u003e component and a second-\r\norder polynomial for combinatorial background, respectively. The parameters of these\r\nPDFs are determined from MC simulations.\r\n　　We obtain a signal yield of 4.6\u003csup\u003e+3.1\u003c/sup\u003e\u003csmall\u003e-2.5\u003c/small\u003e events with a statistical significance of 2.3σ.\r\nAs no significant signal is found for the \u003ci\u003eB\u003c/i\u003e\u003csup\u003e0\u003c/sup\u003e →　\u003ci\u003eJ /ψΦ\u003c/i\u003e decay mode, we an upper\r\nlimit on the yield at the 90% confidence level by a frequentist method using ensembles\r\nof pseudo-experiments. Finally an upper limit at the 90% confidence level is obtained:\r\n\r\n　　　　　　　　　　　　　　\u003ci\u003eβ\u003c/i\u003e(\u003ci\u003eB\u003c/i\u003e\u003csup\u003e0\u003c/sup\u003e → \u003ci\u003eJ /ψΦ\u003c/i\u003e)\u003c 9.4 × 10\u003csup\u003e-7\u003c/sup\u003e.   　　　　　 (1)\r\n\r\n　　This result improves upon the previous result by about a factor of 10 and is\r\nconsistent with the theory prediction. The result shows that a large enhancement\r\n from rescattering is not likely in this decay mode. 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