Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-02-09
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 6 figures, plain LaTeX; v2: Figs.2, 3 and 4 altered. Since many colleagues had observed difficulties in interpreting
Scientific paper
We present evidence for the existence of a light scalar particle that most probably couples exclusively to gluons and quarks. Theoretical and phenomenological arguments are presented to support the existence of a light scalar boson for confinement and quark-pair creation. Previously observed interference effects allow to set a narrow window for the scalar's mass and also for its flavor-mass-dependent coupling to quarks. Here, in order to find a direct signal indicating its production, we study published BABAR data on leptonic bottomonium decays. We observe a clear excess signal in the invariant-mass projections of electron-positron and muon-antimuon, which may be due to the emission of a so far unobserved scalar particle with a mass of about 38 MeV. In the process of our analysis, we also find an indication of the existence of a bottomonium-like hybrid state at about 10.061 GeV. Further signals might be interpreted as replicas of the light scalar, with masses roughly two and three times as large.
Beveren Eef van
Rupp George
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