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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 an id="mmlsi1" class="mathmlsrc">an 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+μan>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">D0alse">→Kπ+μ+μath>an>an>an> 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 an id="mmlsi2" class="mathmlsrc">an 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−1an>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">2.0 fb1ath>an>an>an>. Decay candidates with muon pairs that have an invariant mass in the range an id="mmlsi102" class="mathmlsrc">an 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/c2an>an class="mathContainer hidden">an class="mathCode">ath altimg="si102.gif" overflow="scroll">675–875 MeValse">/c2ath>an>an>an> are considered. This region is dominated by the an id="mmlsi11" class="mathmlsrc">an 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">ρ0an>an class="mathContainer hidden">an class="mathCode">ath altimg="si11.gif" overflow="scroll">ρ0ath>an>an>an> and ω resonances. The branching fraction in this range is measured to be
ass="formula" id="fm0010">
ass="mathml">an id="mmlsi5" class="mathmlsrc"><a 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">ass="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">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si5.gif" overflow="scroll">athvariant="script">Balse">(D0alse">&rarr;Kπ+μ+μalse">)=alse">(4.17±0.12ace width="0.2em">ace>alse">(athvariant="normal">sathvariant="normal">tathvariant="normal">aathvariant="normal">talse">)±0.40ace width="0.2em">ace>alse">(athvariant="normal">sathvariant="normal">yathvariant="normal">sathvariant="normal">talse">)alse">)×106.ath>an>an>an>ass="temp" src="/sd/blank.gif">
This is the first observation of the decay an id="mmlsi1" class="mathmlsrc">an 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&rarr;Kπ+μ+μan>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">D0alse">&rarr;Kπ+μ+μath>an>an>an>. Its branching fraction is consistent with the value expected in the Standard Model.

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