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${{\mathit f}_{{{1}}}{(1420)}}$ MASS

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M006M2

M006M2 VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1427.7 {}^{+1.7}_{-1.4}}$ OUR AVERAGE  Error includes scale factor of 2.1.  See the ideogram below. $1418$ ${}^{+1.7}_{-2.1}$ ${}^{+2.0}_{-2.2}$ 1 ABLIKIM 2025 AB   BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $1433.5$ $\pm1.1$ ${}^{+27.9}_{-0.7}$ 126k ABLIKIM 2023 M   BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ $1434$ $\pm5$ $\pm5$ 133 2 ACHARD 2007   L3 $183 - 209$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ $1426$ $\pm6$ 711 ABDALLAH 2003 H   DLPH 91.2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}{+}$ ${{\mathit X}}$ $1420$ $\pm14$ 3651 NICHITIU 2002   OBLX 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $1428$ $\pm4$ $\pm2$ 20k ADAMS 2001 B   B852 18 GeV ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1426$ $\pm1$ BARBERIS 1997 C   OMEG 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ $1425$ $\pm8$ BERTIN 1997   OBLX 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{\pm}}$( ${{\mathit K}^{0}}$) ${{\mathit \pi}^{\mp}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1430$ $\pm4$ 3 ARMSTRONG 1992 E   OMEG 85,300 ${{\mathit \pi}^{+}}{{\mathit p}}$, ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit p}}$ , ${{\mathit p}}{{\mathit p}}$( ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$) $1462$ $\pm20$ 4 AUGUSTIN 1992   DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $1443$ ${}^{+7}_{-6}$ ${}^{+3}_{-2}$ 1100 BAI 1990 C   MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ $1425$ $\pm10$ 17 BEHREND 1989   CELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ $1442$ $\pm5$ ${}^{+10}_{-17}$ $111$ BECKER 1987   MRK3 ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \omega}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $1423$ $\pm4$ GIDAL 1987 B   MRK2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $1417$ $\pm13$ 13 AIHARA 1986 C   TPC ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $1422$ $\pm3$ CHAUVAT 1984   SPEC ISR 31.5 ${{\mathit p}}{{\mathit p}}$ $1440$ $\pm10$ 5 BROMBERG 1980   SPEC 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ X $1426$ $\pm6$ 221 DIONISI 1980   HBC 4 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit n}}$ $1420$ $\pm20$ DAHL 1967   HBC 1.6$-$4.2 ${{\mathit \pi}^{-}}{{\mathit p}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1430.8$ $\pm0.9$ 6 SOSA 1999   SPEC ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}_{{\mathrm {slow}}}$ (${{\mathit K}_S^0}$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$) ${{\mathit p}}_{{\mathrm {fast}}}$ $1433.4$ $\pm0.8$ 6 SOSA 1999   SPEC ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}_{{\mathrm {slow}}}$ (${{\mathit K}_S^0}$ ${{\mathit K}^{-}}{{\mathit \pi}^{+}}$) ${{\mathit p}}_{{\mathrm {fast}}}$ $1435$ $\pm9$ PROKOSHKIN 1997 B   GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1429$ $\pm3$ $389$ ARMSTRONG 1989   OMEG 300 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit p}}{{\mathit p}}$ $1425$ $\pm2$ 1520 ARMSTRONG 1984   OMEG 85 ${{\mathit \pi}^{+}}{{\mathit p}}$, ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ( ${{\mathit \pi}^{+}}$ ,${{\mathit p}}$) ( ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$) ${{\mathit p}}$ $\sim$$1420$ BITYUKOV 1984   SPEC 32 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}{{\mathit Y}}$ 1  ABLIKIM 2025AB measured ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit f}_{{{1}}}{(1420)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ $/$ ${}^{}0{}^{++}$ $\mathit PHSP$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$. Here ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ $/$ ${}^{}0{}^{++}$ $\mathit PHSP$ indicates an intermediate state which could be either ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ or ${{\mathit \gamma}}{{\mathit \pi}^{0}}{}^{}0{}^{++}$ phase space. 2  From a fit with a width fixed at 55 MeV. 3  This result supersedes ARMSTRONG 1984, ARMSTRONG 1989. 4  From fit to the ${{\mathit K}^{*}{(892)}}{{\mathit K}}{}^{}1{}^{++}$ partial wave. 5  Mass error increased to account for ${{\mathit a}_{{{0}}}{(980)}}$ mass cut uncertainties. 6  No systematic error given.

${{\mathit f}_{{{1}}}{(1420)}}$ mass (MeV)

References