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Search for rare Bº(s) → μ+μ-μ+μ- decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) Search for rare Bº(s) → μ+μ-μ+μ- decays. Physical Review Letters, 110 (21). 211801. doi:10.1103/PhysRevLett.110.211801
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WRAP_LCHb_PhysRevLett.110.211801.pdf - Published Version Available under License Creative Commons Attribution. Download (494Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.110.211801
Abstract
A search for the decays Bºs→μ+μ-μ+μ- and Bº→μ+μ-μ+μ- is performed using data, corresponding to an integrated luminosity of 1.0 fb-1, collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: B(Bºs→μ+μ-μ+μ-)<1.6(1.2)×10-8 and B(Bº→μ+μ-μ+μ-)<6.6(5.3)×10-9 at 95% (90%) confidence level. In addition, limits are set in the context of a supersymmetric model which allows for the Bº(s) meson to decay into a scalar (S) and pseudoscalar particle (P), where S and P have masses of 2.5 GeV/c and 214.3 MeV/c, respectively, both resonances decay into μ+μ-. The branching fraction limits for these decays are B(Bºs→SP)<1.6(1.2)×10-8 and B(Bº→SP)<6.3(5.1)×10-9 at 95% (90%) confidence level.
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