{"title":"利用 ATLAS 探测器搜索通过希格斯玻色子或 Z 玻色子衰变到包含一对光子和一对 b-射流的终态的成对产生的希格斯玻色子","authors":"","doi":"10.1016/j.physletb.2024.138938","DOIUrl":null,"url":null,"abstract":"<div><p>A search is presented for the pair production of higgsinos <span><math><mover><mrow><mi>χ</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> in gauge-mediated supersymmetry models, where the lightest neutralinos <span><math><msubsup><mrow><mover><mrow><mi>χ</mi></mrow><mrow><mo>˜</mo></mrow></mover></mrow><mrow><mn>1</mn></mrow><mrow><mn>0</mn></mrow></msubsup></math></span> decay into a light gravitino <span><math><mover><mrow><mi>G</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> in association with either a Higgs <em>h</em> or a <em>Z</em> boson. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb<sup>−1</sup> of proton–proton collisions at a centre-of-mass energy of <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mspace></mspace><mrow><mi>TeV</mi></mrow></math></span>. It targets final states in which a Higgs boson decays into a photon pair, while the other Higgs or <em>Z</em> boson decays into a <span><math><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> pair, with missing transverse momentum associated with the two gravitinos. Search regions dependent on the amount of missing transverse momentum are defined by the requirements that the diphoton mass should be consistent with the mass of the Higgs boson, and the <span><math><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> mass with the mass of the Higgs or <em>Z</em> boson. The main backgrounds are estimated with data-driven methods using the sidebands of the diphoton mass distribution. No excesses beyond Standard Model expectations are observed and higgsinos with masses up to <span><math><mn>320</mn><mspace></mspace><mrow><mi>GeV</mi></mrow></math></span> are excluded, assuming a branching fraction of 100% for <span><math><msubsup><mrow><mover><mrow><mi>χ</mi></mrow><mrow><mo>˜</mo></mrow></mover></mrow><mrow><mn>1</mn></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><mi>h</mi><mover><mrow><mi>G</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span>. This analysis excludes higgsinos with masses of <span><math><mn>130</mn><mspace></mspace><mrow><mi>GeV</mi></mrow></math></span> for branching fractions to <span><math><mi>h</mi><mover><mrow><mi>G</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> as low as 36%, thus providing complementarity to previous ATLAS searches in final states with multiple leptons or multiple <em>b</em>-jets, targeting different decays of the electroweak bosons.</p></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3000,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324004969/pdfft?md5=8e26fd74c80752b9eea646caf252edf1&pid=1-s2.0-S0370269324004969-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Search for pair-produced higgsinos decaying via Higgs or Z bosons to final states containing a pair of photons and a pair of b-jets with the ATLAS detector\",\"authors\":\"\",\"doi\":\"10.1016/j.physletb.2024.138938\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>A search is presented for the pair production of higgsinos <span><math><mover><mrow><mi>χ</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> in gauge-mediated supersymmetry models, where the lightest neutralinos <span><math><msubsup><mrow><mover><mrow><mi>χ</mi></mrow><mrow><mo>˜</mo></mrow></mover></mrow><mrow><mn>1</mn></mrow><mrow><mn>0</mn></mrow></msubsup></math></span> decay into a light gravitino <span><math><mover><mrow><mi>G</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> in association with either a Higgs <em>h</em> or a <em>Z</em> boson. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb<sup>−1</sup> of proton–proton collisions at a centre-of-mass energy of <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mspace></mspace><mrow><mi>TeV</mi></mrow></math></span>. It targets final states in which a Higgs boson decays into a photon pair, while the other Higgs or <em>Z</em> boson decays into a <span><math><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> pair, with missing transverse momentum associated with the two gravitinos. Search regions dependent on the amount of missing transverse momentum are defined by the requirements that the diphoton mass should be consistent with the mass of the Higgs boson, and the <span><math><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> mass with the mass of the Higgs or <em>Z</em> boson. The main backgrounds are estimated with data-driven methods using the sidebands of the diphoton mass distribution. No excesses beyond Standard Model expectations are observed and higgsinos with masses up to <span><math><mn>320</mn><mspace></mspace><mrow><mi>GeV</mi></mrow></math></span> are excluded, assuming a branching fraction of 100% for <span><math><msubsup><mrow><mover><mrow><mi>χ</mi></mrow><mrow><mo>˜</mo></mrow></mover></mrow><mrow><mn>1</mn></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><mi>h</mi><mover><mrow><mi>G</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span>. This analysis excludes higgsinos with masses of <span><math><mn>130</mn><mspace></mspace><mrow><mi>GeV</mi></mrow></math></span> for branching fractions to <span><math><mi>h</mi><mover><mrow><mi>G</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> as low as 36%, thus providing complementarity to previous ATLAS searches in final states with multiple leptons or multiple <em>b</em>-jets, targeting different decays of the electroweak bosons.</p></div>\",\"PeriodicalId\":20162,\"journal\":{\"name\":\"Physics Letters B\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0370269324004969/pdfft?md5=8e26fd74c80752b9eea646caf252edf1&pid=1-s2.0-S0370269324004969-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics Letters B\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0370269324004969\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics Letters B","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0370269324004969","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
Search for pair-produced higgsinos decaying via Higgs or Z bosons to final states containing a pair of photons and a pair of b-jets with the ATLAS detector
A search is presented for the pair production of higgsinos in gauge-mediated supersymmetry models, where the lightest neutralinos decay into a light gravitino in association with either a Higgs h or a Z boson. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb−1 of proton–proton collisions at a centre-of-mass energy of . It targets final states in which a Higgs boson decays into a photon pair, while the other Higgs or Z boson decays into a pair, with missing transverse momentum associated with the two gravitinos. Search regions dependent on the amount of missing transverse momentum are defined by the requirements that the diphoton mass should be consistent with the mass of the Higgs boson, and the mass with the mass of the Higgs or Z boson. The main backgrounds are estimated with data-driven methods using the sidebands of the diphoton mass distribution. No excesses beyond Standard Model expectations are observed and higgsinos with masses up to are excluded, assuming a branching fraction of 100% for . This analysis excludes higgsinos with masses of for branching fractions to as low as 36%, thus providing complementarity to previous ATLAS searches in final states with multiple leptons or multiple b-jets, targeting different decays of the electroweak bosons.
期刊介绍:
Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.