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First observation of the decay D0 ce:hsp>→ ce:hsp>Kπ+μ+μ in the ρ0-ω region of the dimuon mass spectrum
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A study of the decay i1" class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301022&_mathId=si1.gif&_user=111111111&_pii=S0370269316301022&_rdoc=1&_issn=03702693&md5=a27d90cd9ed1c8a9305ee68cb10567d6" title="Click to view the MathML source">D0→Kπ+μ+μclass="mathContainer hidden">class="mathCode">i1.gif" overflow="scroll">D0chy="false">→Kπ+μ+μ is performed using data collected by the LHCb detector in proton–proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301022&_mathId=si2.gif&_user=111111111&_pii=S0370269316301022&_rdoc=1&_issn=03702693&md5=aa553350039047030cfe0c9c588b103c" title="Click to view the MathML source">2.0 fb−1class="mathContainer hidden">class="mathCode">croll">2.0 fb1. Decay candidates with muon pairs that have an invariant mass in the range i102" class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301022&_mathId=si102.gif&_user=111111111&_pii=S0370269316301022&_rdoc=1&_issn=03702693&md5=9ca79b3c364a17f07386b953b9201081" title="Click to view the MathML source">675–875 MeV/c2class="mathContainer hidden">class="mathCode">i102.gif" overflow="scroll">675875 MeVchy="false">/c2 are considered. This region is dominated by the i11" class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301022&_mathId=si11.gif&_user=111111111&_pii=S0370269316301022&_rdoc=1&_issn=03702693&md5=ed6c8ea4c95c2a6afc807fff99e1cc17" title="Click to view the MathML source">ρ0class="mathContainer hidden">class="mathCode">i11.gif" overflow="scroll">ρ0 and ω resonances. The branching fraction in this range is measured to be
class="formula" id="fm0010">
class="mathml">class="mathmlsrc">ce" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301022&_mathId=si5.gif&_user=111111111&_pii=S0370269316301022&_rdoc=1&_issn=03702693&md5=d01ffc22a3eaefc166cf7db4b86e1662">class="imgLazyJSB inlineImage" height="17" width="414" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316301022-si5.gif">cript>17" border="0" style="vertical-align:bottom" width="414" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316301022-si5.gif">cript>class="mathContainer hidden">class="mathCode">croll">cript">Bchy="false">(D0chy="false">→Kπ+μ+μchy="false">)=chy="false">(4.17±0.12ce width="0.2em">ce>chy="false">(statchy="false">)±0.40ce width="0.2em">ce>chy="false">(systchy="false">)chy="false">)×106.class="temp" src="/sd/blank.gif">
This is the first observation of the decay i1" class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301022&_mathId=si1.gif&_user=111111111&_pii=S0370269316301022&_rdoc=1&_issn=03702693&md5=a27d90cd9ed1c8a9305ee68cb10567d6" title="Click to view the MathML source">D0→Kπ+μ+μclass="mathContainer hidden">class="mathCode">i1.gif" overflow="scroll">D0chy="false">→Kπ+μ+μ. Its branching fraction is consistent with the value expected in the Standard Model.

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