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We present evidence for the existence of a light scalar particle that mostprobably couples exclusively to gluons and quarks. Theoretical andphenomenological arguments are presented to support the existence of a lightscalar boson for confinement and quark-pair creation. Previously observedinterference effects allow to set a narrow window for the scalar's mass andalso for its flavor-mass-dependent coupling to quarks. Here, in order to find adirect signal indicating its production, we study published BABAR data onleptonic bottomonium decays. We observe a clear excess signal in theinvariant-mass projections of electron-positron and muon-antimuon, which may bedue to the emission of a so far unobserved scalar particle with a mass of about38 MeV. In the process of our analysis, we also find an indication of theexistence of a bottomonium-like hybrid state at about 10.061 GeV. Furthersignals might be interpreted as replicas of the light scalar, with massesroughly two and three times as large.

First indications of the existence of a 38 MeV light scalar boson