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${{\mathit \pi}_{{{2}}}{(1670)}}$ MASS

INSPIRE   PDGID:

M034M

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT $\bf{ 1670.6 {}^{+2.9}_{-1.2}}$ OUR AVERAGE  Error includes scale factor of 1.3.  See the ideogram below. $1642$ ${}^{+12}_{-1}$ 46M 1 AGHASYAN 2018 B COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1749$ $\pm10$ $\pm100$ 145k LU 2005 B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$ $1676$ $\pm3$ $\pm8$ 2 CHUNG 2002 B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1685$ $\pm10$ $\pm30$ BARBERIS 2001 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}$3 ${{\mathit \pi}^{0}}{{\mathit p}_{{{s}}}}$ $1687$ $\pm9$ $\pm15$ AMELIN 1999 VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit A}^{*}}$ $1669$ $\pm4$ BARBERIS 1998 B 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit \rho}}$ ${{\mathit \pi}}{{\mathit p}_{{{s}}}}$ $1670$ $\pm4$ BARBERIS 1998 B 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit f}_{{{2}}}{(1270)}}{{\mathit \pi}}$ ${{\mathit p}_{{{s}}}}$ $1690$ $\pm14$ 3 BERDNIKOV 1994 VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$ $1710$ $\pm20$ 700 ANTIPOV 1987 SIGM - 50 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Cu}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \pi}^{-}}{}^{}\mathrm {Cu}$ $1676$ $\pm6$ 3 EVANGELISTA 1981 OMEG - 12 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$ $1657$ $\pm14$ 4, 3 DAUM 1980 D SPEC - 63$-$94 ${{\mathit \pi}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}$ X $1662$ $\pm10$ 2000 3 BALTAY 1977 HBC + 15 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1658$ $\pm3$ ${}^{+24}_{-8}$ 420k 5 ALEKSEEV 2010 COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$ $1730$ $\pm20$ 6 AMELIN 1995 B VES 36 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$ $1742$ $\pm31$ $\pm49$ ANTREASYAN 1990 CBAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $1624$ $\pm21$ 2 BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $1622$ $\pm35$ 7 BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $1693$ $\pm28$ 8 BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $1710$ $\pm20$ 9 DAUM 1981 B SPEC - 63,94 ${{\mathit \pi}^{-}}{{\mathit p}}$ $1660$ $\pm10$ 3 ASCOLI 1973 HBC - 5$-$25 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}_{{{2}}}}$ 1  Statistical error negligible. 2  From ${{\mathit f}_{{{2}}}{(1270)}}{{\mathit \pi}}$ decay. 3  From a fit to $\mathit J{}^{P} = 2{}^{-}{\mathit S}{\mathrm -wave}{{\mathit f}_{{{2}}}{(1270)}}{{\mathit \pi}}$ partial wave. 4  Clear phase rotation seen in 2${}^{–}\mathit S$, 2${}^{–}\mathit P$, 2${}^{–}\mathit D$ waves. We quote central value and spread of single-resonance fits to three channels. 5  Superseded by AGHASYAN 2018B. 6  $\mathit J{}^{PC}$ ambiguous. 7  From ${{\mathit \rho}}{{\mathit \pi}}$ decay. 8  From ${{\mathit \sigma}}{{\mathit \pi}}$ decay. 9  From a two-resonance fit to four 2${}^{–}0{}^{+}$ waves. This should not be averaged with all the single resonance fits.

${{\mathit \pi}_{{{2}}}{(1670)}}$ mass (MeV)

References