Study of the decay by the NA62 experiment

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• 作者：The NA62 Collaboration C. Lazzeroni² ; A. Romano
• 刊名：Physics Letters B
• 出版年：1 May 2014
• 年：2014
• 卷：732
• 期：Complete
• 页码：65-74
• 全文大小：366 K

文摘

A study of the dynamics of the rare decay class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314001725&_mathId=si1.gif&_user=111111111&_pii=S0370269314001725&_rdoc=1&_issn=03702693&md5=52689935d8983d55a30160244f489de3" title="Click to view the MathML source">K^±→蟺^±纬纬class="mathContainer hidden">class="mathCode"> has been performed on a sample of 232 decay candidates, with an estimated background of class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314001725&_mathId=si2.gif&_user=111111111&_pii=S0370269314001725&_rdoc=1&_issn=03702693&md5=002b518c440641f296465257890a05a7" title="Click to view the MathML source">17.4±1.1class="mathContainer hidden">class="mathCode"> events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 Collaboration at CERN. The combined model-independent branching ratio in the kinematic range class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314001725&_mathId=si3.gif&_user=111111111&_pii=S0370269314001725&_rdoc=1&_issn=03702693&md5=df95639cd15981e8d7ff1408a39eb1cf" title="Click to view the MathML source">z=(m_纬纬/m_K)²>0.2class="mathContainer hidden">class="mathCode"> is i4" class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314001725&_mathId=si4.gif&_user=111111111&_pii=S0370269314001725&_rdoc=1&_issn=03702693&md5=b0de9278a9671d5f588098173c761229" title="Click to view the MathML source">B_MI(z>0.2)=(0.965±0.063)×10⁻⁶class="mathContainer hidden">class="mathCode">croll">cript">BMIchy="false">(z>0.2chy="false">)=chy="false">(0.965±0.063chy="false">)×10−6, and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269314001725&_mathId=si5.gif&_user=111111111&_pii=S0370269314001725&_rdoc=1&_issn=03702693&md5=f6523d9a4bad3c5a2b7e02601c0b2cb5" title="Click to view the MathML source">B(K_蟺纬纬)=(1.003±0.056)×10⁻⁶class="mathContainer hidden">class="mathCode">. A detailed comparison of the results with the previous measurements is performed.