Search for the lepton-flavour violating decay D0 → e±μ
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A search for the lepton-flavour violating decay w the MathML source">D0→e±μ is made with a dataset corresponding to an integrated luminosity of w 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">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"> of proton–proton collisions at centre-of-mass energies of w 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">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"> and w 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">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">, collected by the LHCb experiment. Candidate w the MathML source">D0 mesons are selected using the decay w the MathML source">D⁎+→D0π+ and the w the MathML source">D0→e±μ branching fraction is measured using the decay mode w the MathML source">D0→Kπ+ as a normalization channel. No significant excess of w the MathML source">D0→e±μ candidates over the expected background is seen, and a limit is set on the branching fraction, w the MathML source">B(D0→e±μ)<1.3×10−8, 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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