Search for light dark photon with neutral meson decays at the PHENIX experiment

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• 作者：Yorito Yamaguchi¹ ; ^{yorito.yamaguchi@riken.jp" class="auth_mail" title="E-mail the corresponding author} ; for the PHENIX Collaboration²
• 关键词：dark matter ; di-electron
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：956
• 期：Complete
• 页码：882-885
• 全文大小：397 K

文摘

In several theoretical models, an additional U(1) gauge field for dark matter has been introduced to explain experimental results deviating from the standard model calculations. The gauge boson of the U(1) gauge field, a so-called “dark photon”, can mix with QED photons in any photon production process owing to very weak coupling of the U(1) gauge field to the standard model. The dark photon has been relevant recently to explain 3.6σ   discrepancy of the measured muon anomalous magnetic moment formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416300045&_mathId=si1.gif&_user=111111111&_pii=S0375947416300045&_rdoc=1&_issn=03759474&md5=b5af9b79fb5c8a52481f8fd6805710bc" title="Click to view the MathML source">(g−2)_μ${(g-2)}_{\mu }$ from the standard model calculations. The PHENIX experiment has made a search for electron pairs from dark photons appearing within formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416300045&_mathId=si2.gif&_user=111111111&_pii=S0375947416300045&_rdoc=1&_issn=03759474&md5=552fada43b7286f1d0dbf869f85f2533" title="Click to view the MathML source">π⁰${\pi }^0$, η   Dalitz decays. Upper limits on the dark photon mixing strength has been determined for formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416300045&_mathId=si3.gif&_user=111111111&_pii=S0375947416300045&_rdoc=1&_issn=03759474&md5=a05884e859a7e2312cc797570ed8d6d4" title="Click to view the MathML source">30<m_U<90 MeV/c²$30<m_U<90\text{MeV}/c^2$. Combining with relevant results from other experiments, the possibility of the explanation of the measured formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416300045&_mathId=si1.gif&_user=111111111&_pii=S0375947416300045&_rdoc=1&_issn=03759474&md5=b5af9b79fb5c8a52481f8fd6805710bc" title="Click to view the MathML source">(g−2)_μ${(g-2)}_{\mu }$ by the dark photon is ruled out.