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Search for the decay D0→π+π−μ+μ−
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Search for the decay D0→π+π−μ+μ−. Physics Letters B, 728 . pp. 234-243. doi:10.1016/j.physletb.2013.11.053 ISSN 0370-2693.
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Official URL: http://dx.doi.org/10.1016/j.physletb.2013.11.053
Abstract
A search for the D0→π+π−μ+μ− decay, where the muon pair does not originate from a resonance, is performed using proton–proton collision data corresponding to an integrated luminosity of View the MathML source recorded by the LHCb experiment at a centre-of-mass energy of 7 TeV. No signal is observed and an upper limit on the relative branching fraction with respect to the resonant decay mode D0→π+π−ϕ(→μ+μ−), under the assumption of a phase-space model, is found to be
B(D0→π+π−μ+μ−)/B(D0→π+π−ϕ(→μ+μ−))<0.96
at 90% confidence level. The upper limit on the absolute branching fraction is evaluated to be B(D0→π+π−μ+μ−)<5.5×10−7 at 90% confidence level. This is the most stringent to date.
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