Precise measurement of the branching fractions of J/ψ → ¯Λπ+Σ− + c.c. and J/ψ → ¯Λπ−Σ+ + c.c.

• Based on a data sample of (10087±44)×106  J/ψ events collected with the BESIII detector, the branching fraction of J/ψ → ¯Λπ+Σ− + c.c. is measured to be (1.221±0.002±0.038)×10−3, and the branching fraction of its isospin partner mode J/ψ → ¯Λπ−Σ+ + c.c. is measured to be (1.244±0.002±0.045)×10−3 with improved precision. Here the first uncertainties are statistical and the second ones systematic. The isospin symmetry of the Σ baryon in charmonium hadronic decay and the “12% rule” are tested, and no violation is found. The potential of using these channels as Σ baryon sources for nuclear physics research is studied, and the momentum and angular distributions of these sources are provided.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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