Search for the lepton-flavour violating decay Dp>0p> p>→ p>ep>±p>μp>∓p>
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A search for the lepton-flavour violating decay pan id="mmlsi1" class="mathmlsrc">pan 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">Dp>0p>→ep>&plusmn;p>μp>∓p>pan>pan class="mathContainer hidden">pan class="mathCode">p>D0p>→p>e&plusmn;p>p>μ∓p>pan>pan>pan> is made with a dataset corresponding to an integrated luminosity of pan id="mmlsi2" class="mathmlsrc">pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=aeceaccfdc386158ce9873498f288901">View the MathML sourcep: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316000411-si2.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316000411-si2.gif">pt>pan class="mathContainer hidden">pan class="mathCode">3.0pace width="0.25em">pace>p>fb−1p>pan>pan>pan> of proton–proton collisions at centre-of-mass energies of pan id="mmlsi24" class="mathmlsrc">pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=0aeed9fced1f917d344752e5675b6909">View the MathML sourcep: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316000411-si24.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316000411-si24.gif">pt>pan class="mathContainer hidden">pan class="mathCode">7pace width="0.25em">pace>TeVpan>pan>pan> and pan id="mmlsi26" class="mathmlsrc">pii=S0370269316000411&_rdoc=1&_issn=03702693&md5=e9c1ace21c4d45fb036fe0c92757049a">View the MathML sourcep: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316000411-si26.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316000411-si26.gif">pt>pan class="mathContainer hidden">pan class="mathCode">8pace width="0.25em">pace>TeVpan>pan>pan>, collected by the LHCb experiment. Candidate pan id="mmlsi5" class="mathmlsrc">pan 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">Dp>0p>pan>pan class="mathContainer hidden">pan class="mathCode">p>D0p>pan>pan>pan> mesons are selected using the decay pan id="mmlsi27" class="mathmlsrc">pan 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">Dp>⁎+p>→Dp>0p>πp>+p>pan>pan class="mathContainer hidden">pan class="mathCode">p>D⁎+p>→p>D0p>p>π+p>pan>pan>pan> and the pan id="mmlsi1" class="mathmlsrc">pan 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">Dp>0p>→ep>&plusmn;p>μp>∓p>pan>pan class="mathContainer hidden">pan class="mathCode">p>D0p>→p>e&plusmn;p>p>μ∓p>pan>pan>pan> branching fraction is measured using the decay mode pan id="mmlsi28" class="mathmlsrc">pan 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">Dp>0p>→Kp>−p>πp>+p>pan>pan class="mathContainer hidden">pan class="mathCode">p>D0p>→p>K−p>p>π+p>pan>pan>pan> as a normalization channel. No significant excess of pan id="mmlsi1" class="mathmlsrc">pan 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">Dp>0p>→ep>&plusmn;p>μp>∓p>pan>pan class="mathContainer hidden">pan class="mathCode">p>D0p>→p>e&plusmn;p>p>μ∓p>pan>pan>pan> candidates over the expected background is seen, and a limit is set on the branching fraction, pan id="mmlsi8" class="mathmlsrc">pan 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(Dp>0p>→ep>&plusmn;p>μp>∓p>)<1.3×10p>−8p>pan>pan class="mathContainer hidden">pan class="mathCode">pt">B(p>D0p>→p>e&plusmn;p>p>μ∓p>)<1.3×p>10−8p>pan>pan>pan>, 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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