{"_buckets": {"deposit": "6345d908-38b7-4224-8644-1a7d23179c1a"}, "_deposit": {"created_by": 1, "id": "698", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "698"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00000698", "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": "2005-03-24", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "item_1_creator_2": {"attribute_name": "著者名", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "中澤, 秀介"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_creator_3": {"attribute_name": "フリガナ", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "ナカザワ, ヒデユキ"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_date_granted_11": {"attribute_name": "学位授与年月日", "attribute_value_mlt": [{"subitem_dategranted": "2005-03-24"}]}, "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": "2005029", "subitem_description_type": "Other"}]}, "item_1_description_12": {"attribute_name": "要旨", "attribute_value_mlt": [{"subitem_description": "　We have measured π\u003cSUP\u003e+\u003c/SUP\u003eπ\u003cSUP\u003e-\u003c/SUP\u003e and K\u003cSUP\u003e+\u003c/SUP\u003eK\u003cSUP\u003e-\u003c/SUP\u003e production in two-photon collisions using 87.7fb\u003cSUP\u003e-1\u003c/SUP\u003e of data collected with the Belle detector at the asymmetric energy e\u003cSUP\u003e+\u003c/SUP\u003ee-\u003cSUP\u003e-\u003c/SUP\u003e collidor KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (W) range of 2.4 GeV \u003c W \u003c 4.1 GeV and angular region of |cosθ*| \u003c 0.6. The cross section ratio σ(γγ → K\u003cSUP\u003e+\u003c/SUP\u003eK\u003cSUP\u003e-\u003c/SUP\u003e) /σ(γγ → π\u003cSUP\u003e+\u003c/SUP\u003eπ\u003cSUP\u003e-\u003c/SUP\u003e) is measured to be 0.89 ± 0.04 ± 0.15 in the range of 3.0 GeV \u003c W \u003c 4.1 GeV, where the ratio is energy independent. We observe a sin\u003cSUP\u003e-4\u003c/SUP\u003e θ* behavior of the cross section in the same W range. Production of χ\u003cSUB\u003ec0\u003c/SUB\u003e and χ\u003cSUB\u003ec2\u003c/SUB\u003e mesons is observed in both γγ → π\u003cSUP\u003e+\u003c/SUP\u003eπ\u003cSUP\u003e-\u003c/SUP\u003e and γγ → K\u003cSUP\u003e+\u003c/SUP\u003eK\u003cSUP\u003e-\u003c/SUP\u003e modes. The products of the two-photon decay width and the branching ratio are measured to be\u003cbr /\u003e\u003cbr /\u003eΓ\u003cSUB\u003eγγ\u003c/SUB\u003e(χ\u003cSUB\u003ec0\u003c/SUB\u003e)Br(χ\u003cSUB\u003ec0\u003c/SUB\u003e → π\u003cSUP\u003e+\u003c/SUP\u003eπ\u003cSUP\u003e-\u003c/SUP\u003e) = 15.1 ± 2.1 ± 2.3 eV\u003cbr /\u003eΓ\u003cSUB\u003eγγ\u003c/SUB\u003e(χ\u003cSUB\u003ec0\u003c/SUB\u003e)Br(χ\u003cSUB\u003ec0\u003c/SUB\u003e → K\u003cSUP\u003e+\u003c/SUP\u003eK\u003cSUP\u003e-\u003c/SUP\u003e) = 14.3 ± 1.6 ± 2.3 eV\u003cbr /\u003eΓ\u003cSUB\u003eγγ\u003c/SUB\u003e(χ\u003cSUB\u003ec2\u003c/SUB\u003e)Br(χ\u003cSUB\u003ec2\u003c/SUB\u003e → π\u003cSUP\u003e+\u003c/SUP\u003eπ\u003cSUP\u003e-\u003c/SUP\u003e) = 0.76 ± 0.14 ± 0.11 eV\u003cbr /\u003eΓ\u003cSUB\u003eγγ\u003c/SUB\u003e(χ\u003cSUB\u003ec2\u003c/SUB\u003e)Br(χ\u003cSUB\u003ec2\u003c/SUB\u003e → K\u003cSUP\u003e+\u003c/SUP\u003eK\u003cSUP\u003e-\u003c/SUP\u003e) = 0.44 ± 0.11 ± 0.07 eV\u003cbr /\u003e\u003cbr /\u003ewhich result in the combined two-photon decay width\u003cbr /\u003e\u003cbr /\u003eΓ\u003cSUB\u003eγγ\u003c/SUB\u003e(χ\u003cSUB\u003ec0\u003c/SUB\u003e) = 2.62 ± 0.23 (stat.) ± 0.31 (syst.) ± 0.24 (B) keV\u003cbr /\u003eΓ\u003cSUB\u003eγγ\u003c/SUB\u003e(χ\u003cSUB\u003ec2\u003c/SUB\u003e) = 0.44 ± 0.07 (stat.) ± 0.05 (syst.) ± 0.05 (B) keV.", "subitem_description_type": "Other"}]}, "item_1_description_7": {"attribute_name": "学位記番号", "attribute_value_mlt": [{"subitem_description": "総研大甲第852号", "subitem_description_type": "Other"}]}, "item_1_select_14": {"attribute_name": "所蔵", "attribute_value_mlt": [{"subitem_select_item": "有"}]}, "item_1_select_8": {"attribute_name": "研究科", "attribute_value_mlt": [{"subitem_select_item": "高エネルギー加速器科学研究科"}]}, "item_1_select_9": {"attribute_name": "専攻", "attribute_value_mlt": [{"subitem_select_item": "14 素粒子原子核専攻"}]}, "item_1_text_10": {"attribute_name": "学位授与年度", "attribute_value_mlt": [{"subitem_text_value": "2004"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "NAKAZAWA, Hideyuki", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2016-02-17"}], "displaytype": "simple", "download_preview_message": "", "file_order": 0, "filename": "甲852_要旨.pdf", "filesize": [{"value": "162.6 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_11", "mimetype": "application/pdf", "size": 162600.0, "url": {"label": "要旨・審査要旨", "url": "https://ir.soken.ac.jp/record/698/files/甲852_要旨.pdf"}, "version_id": "06e5ce00-3679-4199-85d1-e9f9ac0b9163"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "thesis", "resourceuri": "http://purl.org/coar/resource_type/c_46ec"}]}, "item_title": "Measurement of the processes γγ→π+π-  and γγ→K+K- at enegies of 2.4-4.1GeV", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Measurement of the processes γγ→π+π-  and γγ→K+K- at enegies of 2.4-4.1GeV"}, {"subitem_title": "Measurement of the processes γγ→π+π-  and γγ→K+K- at enegies of 2.4-4.1GeV", "subitem_title_language": "en"}]}, "item_type_id": "1", "owner": "1", "path": ["16"], "permalink_uri": "https://ir.soken.ac.jp/records/698", "pubdate": {"attribute_name": "公開日", "attribute_value": "2010-02-22"}, "publish_date": "2010-02-22", "publish_status": "0", "recid": "698", "relation": {}, "relation_version_is_last": true, "title": ["Measurement of the processes γγ→π+π-  and γγ→K+K- at enegies of 2.4-4.1GeV"], "weko_shared_id": 1}