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Search for the lepton-flavour violating decay D0 → e±μ
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A search for the lepton-flavour violating decay mmlsi1" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si1.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=fc1877ec9ab7d383146f53623195cc45" title="Click to view the MathML source">D0→e&plusmn;μmathContainer 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>emi>mrow><mrow><mo>&plusmn;mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>∓mo>mrow>msup>math> is made with a dataset corresponding to an integrated luminosity of mmlsi2" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si2.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=aeceaccfdc386158ce9873498f288901">mg class="imgLazyJSB inlineImage" height="14" width="51" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316000411-si2.gif">mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mn>3.0mn><mspace width="0.25em">mspace><msup><mrow><mtext>fbmtext>mrow><mrow><mo>&minus;mo><mn>1mn>mrow>msup>math> of proton–proton collisions at centre-of-mass energies of mmlsi24" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si24.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=0aeed9fced1f917d344752e5675b6909">mg class="imgLazyJSB inlineImage" height="10" width="36" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316000411-si24.gif">mathContainer hidden">mathCode"><math altimg="si24.gif" overflow="scroll"><mn>7mn><mspace width="0.25em">mspace><mtext>TeVmtext>math> and mmlsi26" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si26.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=e9c1ace21c4d45fb036fe0c92757049a">mg class="imgLazyJSB inlineImage" height="10" width="35" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316000411-si26.gif">mathContainer hidden">mathCode"><math altimg="si26.gif" overflow="scroll"><mn>8mn><mspace width="0.25em">mspace><mtext>TeVmtext>math>, collected by the LHCb experiment. Candidate mmlsi5" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si5.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=f0e2cdc444fe36fa3f696d6a2040a4a6" title="Click to view the MathML source">D0mathContainer hidden">mathCode"><math altimg="si5.gif" overflow="scroll"><msup><mrow><mi>Dmi>mrow><mrow><mn>0mn>mrow>msup>math> mesons are selected using the decay mmlsi27" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si27.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=35be6e726715a8b901212af5c88ce833" title="Click to view the MathML source">D⁎+→D0π+mathContainer hidden">mathCode"><math altimg="si27.gif" overflow="scroll"><msup><mrow><mi>Dmi>mrow><mrow><mo>⁎mo><mo>+mo>mrow>msup><mo stretchy="false">→mo><msup><mrow><mi>Dmi>mrow><mrow><mn>0mn>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup>math> and the mmlsi1" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si1.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=fc1877ec9ab7d383146f53623195cc45" title="Click to view the MathML source">D0→e&plusmn;μmathContainer 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>emi>mrow><mrow><mo>&plusmn;mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>∓mo>mrow>msup>math> branching fraction is measured using the decay mode mmlsi28" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si28.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=50acf2c2ba49be9507581c6d97f5c66b" title="Click to view the MathML source">D0→K&minus;π+mathContainer hidden">mathCode"><math altimg="si28.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>math> as a normalization channel. No significant excess of mmlsi1" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si1.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=fc1877ec9ab7d383146f53623195cc45" title="Click to view the MathML source">D0→e&plusmn;μmathContainer 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>emi>mrow><mrow><mo>&plusmn;mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>∓mo>mrow>msup>math> candidates over the expected background is seen, and a limit is set on the branching fraction, mmlsi8" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000411&_mathId=si8.gif&_user=111111111&_pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=8fe2e966e026ab3053ca20b522e85073" title="Click to view the MathML source">B(D0→e&plusmn;μ)<1.3&times;10&minus;8mathContainer hidden">mathCode"><math altimg="si8.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>emi>mrow><mrow><mo>&plusmn;mo>mrow>msup><msup><mrow><mi>μmi>mrow><mrow><mo>∓mo>mrow>msup><mo stretchy="false">)mo><mo><mo><mn>1.3mn><mo>&times;mo><msup><mrow><mn>10mn>mrow><mrow><mo>&minus;mo><mn>8mn>mrow>msup>math>, at 90% confidence level. This is an order of magnitude lower than the previous limit and it further constrains the parameter space in some leptoquark models and in supersymmetric models with R-parity violation.

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