First observation of the decay D0 → Kπ+μ+μ in the ρ0-ω region of the dimuon mass spectrum
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A study of the decay thmlsrc">text 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+μthContainer hidden">thCode">th altimg="si1.gif" overflow="scroll">D0tretchy="false">→Kπ+μ+μth> 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 thmlsrc">text 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−1thContainer hidden">thCode">th altimg="si2.gif" overflow="scroll">2.0text> fbtext>1th>. Decay candidates with muon pairs that have an invariant mass in the range thmlsrc">text 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/c2thContainer hidden">thCode">th altimg="si102.gif" overflow="scroll">675text>–text>875text> MeVtext>tretchy="false">/c2th> are considered. This region is dominated by the thmlsrc">text 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">ρ0thContainer hidden">thCode">th altimg="si11.gif" overflow="scroll">ρ0th> and ω resonances. The branching fraction in this range is measured to be
thml">thmlsrc">title="View the MathML source" 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">t="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">t>t="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">t>thContainer hidden">thCode">th altimg="si5.gif" overflow="scroll">thvariant="script">Btretchy="false">(D0tretchy="false">→Kπ+μ+μtretchy="false">)=tretchy="false">(4.17±0.12th="0.2em">tretchy="false">(thvariant="normal">sthvariant="normal">tthvariant="normal">athvariant="normal">ttretchy="false">)±0.40th="0.2em">tretchy="false">(thvariant="normal">sthvariant="normal">ythvariant="normal">sthvariant="normal">ttretchy="false">)tretchy="false">)×106.th>temp" src="/sd/blank.gif">
This is the first observation of the decay thmlsrc">text 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+μthContainer hidden">thCode">th altimg="si1.gif" overflow="scroll">D0tretchy="false">→Kπ+μ+μth>. Its branching fraction is consistent with the value expected in the Standard Model.

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