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 id="mmlsi1" class="mathmlsrc">ixSupport 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→K&minus;π+μ+μ&minus;iner hidden">img="si1.gif" overflow="scroll">i>Di>0i>Ki>&minus;i>πi>+i>μi>+i>μi>&minus; 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 id="mmlsi2" class="mathmlsrc">ixSupport 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&minus;1iner hidden">img="si2.gif" overflow="scroll">2.0 fb&minus;1. Decay candidates with muon pairs that have an invariant mass in the range id="mmlsi102" class="mathmlsrc">ixSupport 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/c2iner hidden">img="si102.gif" overflow="scroll">675875 MeV/i>ci>2 are considered. This region is dominated by the id="mmlsi11" class="mathmlsrc">ixSupport 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">ρ0iner hidden">img="si11.gif" overflow="scroll">i>ρi>0 and ω resonances. The branching fraction in this range is measured to beiv class="formula" id="fm0010">iv class="mathml">id="mmlsi5" class="mathmlsrc">itle="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"><img 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">ipt><img height="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">ipt>iner hidden">img="si5.gif" overflow="scroll">i mathvariant="script">Bi>(i>Di>0i>Ki>&minus;i>πi>+i>μi>+i>μi>&minus;)=(4.17±0.12idth="0.2em">(i mathvariant="normal">si>i mathvariant="normal">ti>i mathvariant="normal">ai>i mathvariant="normal">ti>)±0.40idth="0.2em">(i mathvariant="normal">si>i mathvariant="normal">yi>i mathvariant="normal">si>i mathvariant="normal">ti>))&times;10&minus;6.<img class="temp" src="/sd/blank.gif">iv>iv> This is the first observation of the decay id="mmlsi1" class="mathmlsrc">ixSupport 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→K&minus;π+μ+μ&minus;iner hidden">img="si1.gif" overflow="scroll">i>Di>0i>Ki>&minus;i>πi>+i>μi>+i>μi>&minus;. Its branching fraction is consistent with the value expected in the Standard Model.
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