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- W2034173404 abstract "We report the first observation of the charge symmetry breaking $d+densuremath{rightarrow}^{4}mathrm{H}mathrm{e}+{ensuremath{pi}}^{0}$ reaction near threshold. Measurements using a magnetic channel (gated by two photons) of the $^{4}mathrm{H}mathrm{e}$ scattering angle and momentum (from time of flight) permitted reconstruction of the ${ensuremath{pi}}^{0}$ ``missing mass,'' the quantity used to separate $^{4}mathrm{H}mathrm{e}+{ensuremath{pi}}^{0}$ events from the continuum of double radiative capture $^{4}mathrm{H}mathrm{e}+ensuremath{gamma}+ensuremath{gamma}$ events. We measured total cross sections for neutral pion production of $12.7ifmmodepmelsetextpmfi{}2.2text{ }mathrm{p}mathrm{b}$ at 228.5 MeV and $15.1ifmmodepmelsetextpmfi{}3.1text{ }mathrm{p}mathrm{b}$ at 231.8 MeV. The uncertainty is dominated by statistical errors. These cross sections arise fundamentally from the down-up quark mass difference and quark electromagnetic effects that contribute in part through meson mixing (e.g., ${ensuremath{pi}}^{0}ensuremath{-}ensuremath{eta}$) mechanisms." @default.
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- W2034173404 date "2003-10-02" @default.
- W2034173404 modified "2023-09-24" @default.
- W2034173404 title "Observation of the Charge Symmetry Breaking<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>d</mml:mi><mml:mo>+</mml:mo><mml:mi>d</mml:mi><mml:mo>→</mml:mo><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>H</mml:mi><mml:mi mathvariant=normal>e</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>Reaction Near Threshold" @default.
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- W2034173404 doi "https://doi.org/10.1103/physrevlett.91.142302" @default.
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