Search for long-lived scalar particles in $B^+ \to K^+ χ (μ^+μ^-)$ decaysстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 23 июня 2017 г.
Аннотация:A search for a long-lived scalar particle χ is performed, looking for the decay B+→K+χ with χ→μ+μ− in pp collision data corresponding to an integrated luminosity of 3fb−1, collected by the LHCb experiment at centre-of-mass energies of s√=7 and 8TeV. This new scalar particle, predicted by Hidden Sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass 250<m(χ)<4700MeV/c2 and lifetime 0.1<τ(χ)<1000ps. Upper limits on the branching fraction B(B+→K+χ(μ+μ−)) at 95% confidence level are set as a function of m(χ) and τ(χ), varying between 2×10−10 and 10−7
. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.