Search for the lepton-flavour violating decay D0 → e±μ
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A search for the lepton-flavour violating decay an id="mmlsi1" class="mathmlsrc">an class="formulatext 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&rarr;e±μan>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">D0alse">&rarr;e±μath>an>an>an> is made with a dataset corresponding to an integrated luminosity of an id="mmlsi2" class="mathmlsrc"><a title="View the MathML source" class="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">ass="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">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">3.0ace width="0.25em">ace>fb1ath>an>an>an> of proton&ndash;proton collisions at centre-of-mass energies of an id="mmlsi24" class="mathmlsrc"><a title="View the MathML source" class="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">ass="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">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si24.gif" overflow="scroll">7ace width="0.25em">ace>TeVath>an>an>an> and an id="mmlsi26" class="mathmlsrc"><a title="View the MathML source" class="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">ass="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">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si26.gif" overflow="scroll">8ace width="0.25em">ace>TeVath>an>an>an>, collected by the LHCb experiment. Candidate an id="mmlsi5" class="mathmlsrc">an class="formulatext 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">D0an>an class="mathContainer hidden">an class="mathCode">ath altimg="si5.gif" overflow="scroll">D0ath>an>an>an> mesons are selected using the decay an id="mmlsi27" class="mathmlsrc">an class="formulatext 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⁎+&rarr;D0π+an>an class="mathContainer hidden">an class="mathCode">ath altimg="si27.gif" overflow="scroll">D+alse">&rarr;D0π+ath>an>an>an> and the an id="mmlsi1" class="mathmlsrc">an class="formulatext 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&rarr;e±μan>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">D0alse">&rarr;e±μath>an>an>an> branching fraction is measured using the decay mode an id="mmlsi28" class="mathmlsrc">an class="formulatext 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&rarr;Kπ+an>an class="mathContainer hidden">an class="mathCode">ath altimg="si28.gif" overflow="scroll">D0alse">&rarr;Kπ+ath>an>an>an> as a normalization channel. No significant excess of an id="mmlsi1" class="mathmlsrc">an class="formulatext 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&rarr;e±μan>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">D0alse">&rarr;e±μath>an>an>an> candidates over the expected background is seen, and a limit is set on the branching fraction, an id="mmlsi8" class="mathmlsrc">an class="formulatext 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&rarr;e±μ)<1.3×10−8an>an class="mathContainer hidden">an class="mathCode">ath altimg="si8.gif" overflow="scroll">athvariant="script">Balse">(D0alse">&rarr;e±μalse">)<1.3×108ath>an>an>an>, 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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