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

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M034W

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT $\bf{ 258 {}^{+8}_{-9}}$ OUR AVERAGE  Error includes scale factor of 1.2. $311$ ${}^{+12}_{-23}$ 46M 1 AGHASYAN 2018 B COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $408$ $\pm60$ $\pm250$ 145k LU 2005 B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$ $254$ $\pm3$ $\pm31$ 2 CHUNG 2002 B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$ $265$ $\pm30$ $\pm40$ BARBERIS 2001 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}$3 ${{\mathit \pi}^{0}}{{\mathit p}_{{s}}}$ $168$ $\pm43$ $\pm53$ AMELIN 1999 VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit A}^{*}}$ $268$ $\pm15$ BARBERIS 1998 B 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}{{\mathit \rho}}$ ${{\mathit \pi}}{{\mathit p}_{{s}}}$ $256$ $\pm15$ BARBERIS 1998 B 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}{{\mathit f}_{{2}}{(1270)}}{{\mathit \pi}}$ ${{\mathit p}_{{s}}}$ $190$ $\pm50$ 3 BERDNIKOV 1994 VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$ $170$ $\pm80$ 700 ANTIPOV 1987 SIGM - 50 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Cu}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \pi}^{-}}{}^{}\mathrm {Cu}$ $260$ $\pm20$ 3 EVANGELISTA 1981 OMEG - 12 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$ $219$ $\pm20$ 4, 3 DAUM 1980 D SPEC - 63$-$94 ${{\mathit \pi}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}$ X $285$ $\pm60$ 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. • • $271$ $\pm9$ ${}^{+22}_{-24}$ 420k 5 ALEKSEEV 2010 COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$ $310$ $\pm20$ 6 AMELIN 1995 B VES 36 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$ $236$ $\pm49$ $\pm36$ ANTREASYAN 1990 CBAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $304$ $\pm22$ 2 BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $404$ $\pm108$ 7 BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $330$ $\pm90$ 8 BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $312$ $\pm50$ 9 DAUM 1981 B SPEC - 63,94 ${{\mathit \pi}^{-}}{{\mathit p}}$ $270$ $\pm60$ 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 $\mathit J{}^{P} = 2{}^{-}$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit \pi}}$ 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.

References:

AGHASYAN 2018B PR D98 092003 Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$ ALEKSEEV 2010 PRL 104 241803 Observation of a $\mathit J{}^{PC} = 1-+$ Exotic Resonance in Diffractive Dissociation of 190 GeV/$\mathit c$ ${{\mathit \pi}^{-}}$ into ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ LU 2005 PRL 94 032002 Exotic Meson Decay to ${{\mathit \omega}}{{\mathit \pi}^{0}}{{\mathit \pi}^{-}}$ CHUNG 2002 PR D65 072001 Exotic and ${\mathit {\mathit q}}{\mathit {\overline{\mathit q}}}$ Resonances in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ System Produced in ${{\mathit \pi}^{-}}{{\mathit p}}$ Collisions at 18-GeV/$\mathit c$ BARBERIS 2001 PL B507 14 A Study of the Centrally Produced ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ Channel in ${{\mathit p}}{{\mathit p}}$ Interactions at 450 ${\mathrm {GeV/}}\mathit c$ AMELIN 1999 PAN 62 445 Investigation of the Reaction ${{\mathit \pi}^{-}}$ ${+}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{+}$ ${{\mathit A}}$ BARBERIS 1998B PL B422 399 A Study of the Centrally Produced ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Channel in ${{\mathit p}}{{\mathit p}}$ Interactions at 450 ${\mathrm {GeV/}}\mathit c$ AMELIN 1995B PL B356 595 Study of Resonance Production in Diffractive Reaction ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$ BERDNIKOV 1994 PL B337 219 Study of the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$ at 37 ${\mathrm {GeV/}}\mathit c$ ANTREASYAN 1990 ZPHY C48 561 First Observation of the Reaction ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}_{{2}}{(1670)}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}}$ ANTIPOV 1987 EPL 4 403 Direct Observation of ${{\mathit \pi}_{{2}}{(1670)}}$ in the ${{\mathit \rho}}{{\mathit \pi}^{-}}$ System BELLINI 1985 SJNP 41 781 $2{}^{-}{}^{}$ Resonances in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ Systems DAUM 1981B NP B182 269 Diffractive Production of 3${{\mathit \pi}}$ States at 63 and 94 GeV EVANGELISTA 1981 NP B178 197 Results from a ${{\mathit \pi}^{-}}{{\mathit p}}$ Slow Proton Trigger Experiment at 12 ${\mathrm {GeV/}}\mathit c$ Also NP B186 594 Results from a ${{\mathit \pi}^{-}}{{\mathit p}}$ Slow Proton Trigger Experiment at 12 ${\mathrm {GeV/}}\mathit c$ DAUM 1980D PL 89B 285 3${{\mathit \pi}}$ Resonances in $2{}^{-}{}^{}$ Partial Waves BALTAY 1977 PRL 39 591 Diffractive and Nondiffractive ${{\mathit A}_{{1}}}$, ${{\mathit A}_{{3}}}$ and ${{\mathit A}_{{4}}}$ Production in ${{\mathit \pi}^{+}}{{\mathit p}}$ Interactions at 15 ${\mathrm {GeV/}}\mathit c$ ASCOLI 1973 PR D7 669 Spin Parity Analysis of the ${{\mathit A}_{{3}}}$