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${{\mathit f}_{{{2}}}{(1270)}}$ MASS

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VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1275.4 \pm0.8}$ OUR AVERAGE  Error includes scale factor of 1.1. $1275.8$ $\pm1.0$ $\pm0.4$ 1 BOGOLYUBSKY 2013 SPEC 7${{\mathit \pi}^{+}}({{\mathit K}^{+}},{{\mathit p}}){{\mathit A}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}{+}$ ${{\mathit X}}$ $1262$ ${}^{+1}_{-2}$ $\pm8$ 2 ABLIKIM 2006 V BES2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1275$ $\pm15$ ABLIKIM 2005 BES2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1283$ $\pm5$ ALDE 1998 GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1272$ $\pm8$ 200k PROKOSHKIN 1994 GAM2 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1269.7$ $\pm5.2$ 5730 AUGUSTIN 1989 DM2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 5 ${{\mathit \pi}}$ $1283$ $\pm8$ $400$ 3 ALDE 1987 GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 4 ${{\mathit \pi}^{0}}{{\mathit n}}$ $1274$ $\pm5$ 3 AUGUSTIN 1987 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1283$ $\pm6$ 4 LONGACRE 1986 MPS 22 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit K}_S^0}$ $1276$ $\pm7$ COURAU 1984 DLCO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1273.3$ $\pm2.3$ 5 CHABAUD 1983 ASPK 17 ${{\mathit \pi}^{-}}{{\mathit p}}$ polarized $1280$ $\pm4$ 6 CASON 1982 STRC 8 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}^{++}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $1281$ $\pm7$ $11600$ GIDAL 1981 MRK2 ${{\mathit J / \psi}}$ decay $1282$ $\pm5$ 7 CORDEN 1979 OMEG 12$-$15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}}$ $1269$ $\pm4$ 10k APEL 1975 NICE 40 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}^{0}}$ $1272$ $\pm4$ 4600 ENGLER 1974 DBC 6 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1277$ $\pm4$ 5300 FLATTE 1971 HBC 7.0 ${{\mathit \pi}^{+}}{{\mathit p}}$ $1273$ $\pm8$ 3 STUNTEBECK 1970 HBC 8 ${{\mathit \pi}^{-}}{{\mathit p}}$, 5.4 ${{\mathit \pi}^{+}}{{\mathit d}}$ $1265$ $\pm8$ BOESEBECK 1968 HBC 8 ${{\mathit \pi}^{+}}{{\mathit p}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1257$ $\pm6$ 8 KLEMPT 2022 RVUE ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ , ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $1263$ $\pm12$ CARVER 2021 CLAS ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit p}}$ $1259$ $\pm4$ $\pm4$ 1.7k 9, 10 DOBBS 2015 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1267$ $\pm4$ $\pm3$ 1.5k 9, 10 DOBBS 2015 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1277$ $\pm6$ 870 11 SCHEGELSKY 2006 A RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $1251$ $\pm10$ TIKHOMIROV 2003 SPEC 40.0 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit K}_L^0}$ X $1260$ $\pm10$ 12 ALDE 1997 GAM2 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $1278$ $\pm6$ 12 GRYGOREV 1996 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ X $1262$ $\pm11$ AGUILAR-BENIT.. 1991 EHS 400 ${{\mathit p}}{{\mathit p}}$ $1275$ $\pm10$ AKER 1991 CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}}$ $1220$ $\pm10$ BREAKSTONE 1990 SFM ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1288$ $\pm12$ ABACHI 1986 B HRS ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ X $1284$ $\pm30$ 3k BINON 1983 GAM2 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \eta}}$ $1280$ $\pm20$ 3k APEL 1982 CNTR 25 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}^{0}}$ $1284$ $\pm10$ 16000 DEUTSCHMANN 1976 HBC 16 ${{\mathit \pi}^{+}}{{\mathit p}}$ $1258$ $\pm10$ 600 TAKAHASHI 1972 HBC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}}$ $1275$ $\pm13$ ARMENISE 1970 HBC 9 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1261$ $\pm5$ 1960 3 ARMENISE 1968 DBC 5.1 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}$ MM${}^{-}$ $1270$ $\pm10$ 360 3 ARMENISE 1968 DBC 5.1 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{0}}$ MM $1268$ $\pm6$ 13 JOHNSON 1968 HBC 3.7$-$4.2 ${{\mathit \pi}^{-}}{{\mathit p}}$ 1  Averaged over six nuclear targets, no statistically significant dependence on target nucleus observed. 2  Breit-Wigner mass. 3  Mass errors enlarged by us to $\Gamma /\sqrt {\mathit N }$; see the note with the ${{\mathit K}^{*}{(892)}}$ mass. 4  From a partial-wave analysis of data using a K-matrix formalism with 5 poles. 5  From an energy-independent partial-wave analysis. 6  From an amplitude analysis of the reaction ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$ $\rightarrow$ 2 ${{\mathit \pi}^{0}}$. 7  From an amplitude analysis of ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ scattering data. 8  Fit of the tensor partial waves from BES3 in the multipole basis. 9  Using CLEO-c data but not authored by the CLEO Collaboration. 10  From a fit to a Breit-Wigner line shape with fixed $\Gamma $ = 185 MeV. 11  From analysis of L3 data at 91 and $183 - 209$ GeV. 12  Systematic uncertainties not estimated. 13  JOHNSON 1968 includes BONDAR 1963, LEE 1964, DERADO 1965, EISNER 1967.

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