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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 mmlsi1" class="mathmlsrc">mulatext 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→K&minus;π+μ+μ&minus;mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msup><mrow><mi>Dmi>mrow><mrow><mn>0mn>mrow>msup><mo stretchy="false">→mo><msup><mrow><mi>Kmi>mrow><mrow><mo>&minus;mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>&minus;mo>mrow>msup>math> 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 mmlsi2" class="mathmlsrc">mulatext 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&minus;1mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mn>2.0mn><msup><mrow><mtext> fbmtext>mrow><mrow><mo>&minus;mo><mn>1mn>mrow>msup>math>. Decay candidates with muon pairs that have an invariant mass in the range mmlsi102" class="mathmlsrc">mulatext 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/c2mathContainer hidden">mathCode"><math altimg="si102.gif" overflow="scroll"><mn>675mn><mtext>–mtext><mn>875mn><mtext> MeVmtext><mo stretchy="false">/mo><msup><mrow><mi>cmi>mrow><mrow><mn>2mn>mrow>msup>math> are considered. This region is dominated by the mmlsi11" class="mathmlsrc">mulatext 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">ρ0mathContainer hidden">mathCode"><math altimg="si11.gif" overflow="scroll"><msup><mrow><mi>ρmi>mrow><mrow><mn>0mn>mrow>msup>math> and m>ωm> resonances. The branching fraction in this range is measured to be
mula" id="fm0010">
mathml">mmlsi5" class="mathmlsrc">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">mg 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">mathContainer hidden">mathCode"><math altimg="si5.gif" overflow="scroll"><mi mathvariant="script">Bmi><mo stretchy="false">(mo><msup><mrow><mi>Dmi>mrow><mrow><mn>0mn>mrow>msup><mo stretchy="false">→mo><msup><mrow><mi>Kmi>mrow><mrow><mo>&minus;mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>&minus;mo>mrow>msup><mo stretchy="false">)mo><mo>=mo><mo stretchy="false">(mo><mn>4.17mn><mo>&plusmn;mo><mn>0.12mn><mspace width="0.2em">mspace><mrow><mo stretchy="false">(mo><mi mathvariant="normal">smi><mi mathvariant="normal">tmi><mi mathvariant="normal">ami><mi mathvariant="normal">tmi><mo stretchy="false">)mo>mrow><mo>&plusmn;mo><mn>0.40mn><mspace width="0.2em">mspace><mrow><mo stretchy="false">(mo><mi mathvariant="normal">smi><mi mathvariant="normal">ymi><mi mathvariant="normal">smi><mi mathvariant="normal">tmi><mo stretchy="false">)mo>mrow><mo stretchy="false">)mo><mo>&times;mo><msup><mrow><mn>10mn>mrow><mrow><mo>&minus;mo><mn>6mn>mrow>msup><mo>.mo>math>mg class="temp" src="/sd/blank.gif">
This is the first observation of the decay mmlsi1" class="mathmlsrc">mulatext 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→K&minus;π+μ+μ&minus;mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msup><mrow><mi>Dmi>mrow><mrow><mn>0mn>mrow>msup><mo stretchy="false">→mo><msup><mrow><mi>Kmi>mrow><mrow><mo>&minus;mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>&minus;mo>mrow>msup>math>. Its branching fraction is consistent with the value expected in the Standard Model.

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