# 3 ${{\boldsymbol \pi}}$ MODE INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 1318.6 \pm1.3}$ OUR AVERAGE  Error includes scale factor of 1.4.
$1314.5$ ${}^{+4.0}_{-3.3}$ 46M 1
 2018 B
COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1326$ $\pm2$ $\pm2$
 2002
B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1317$ $\pm3$
 1998 B
450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}_{{s}}}$
$1323$ $\pm4$ $\pm3$
 1997 T
L3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$1320$ $\pm7$
 1997 B
ARG ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$1311.3$ $\pm1.6$ $\pm3.0$ 72.4k
 1996
VES 36 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$
$1310$ $\pm5$
 1990
OMEG 0 300.0 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$1323.8$ $\pm2.3$ 4022
 1989
DM2 +- ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \rho}^{\pm}}{{\mathit a}_{{2}}^{\mp}}$
$1320.6$ $\pm3.1$ 3562
 1989
DM2 0 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \rho}^{0}}{{\mathit a}_{{2}}^{0}}$
$1317$ $\pm2$ 25k 2
 1980 C
SPEC - 63,94 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$
$1320$ $\pm10$ 1097 2
 1978 B
HBC +0 15 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$4 ${{\mathit \pi}}$
$1306$ $\pm8$
 1978
OMEG - 9 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$
$1318$ $\pm7$ 1.6k 2
 1975
DBC 0 4 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}$(3 ${{\mathit \pi}}$) ${}^{0}$
$1315$ $\pm5$ 2
 1973 C
CNTR - 25,40 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \eta}}{{\mathit \pi}^{-}}$
$1306$ $\pm9$ 1580
 1973
HBC - 3.9 ${{\mathit \pi}^{-}}{{\mathit p}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1321$ $\pm1$ ${}^{+0}_{-7}$ 420k 3
 2010
COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$
$1300$ $\pm2$ $\pm4$ 18k 4
 2006
RVUE 0 ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$1305$ $\pm14$
 1993
SHF ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1310$ $\pm2$ 2
 1981
OMEG - 12 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$
$1343$ $\pm11$ 490
 1978 B
HBC 0 15 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}}$3 ${{\mathit \pi}}$
$1309$ $\pm5$ 5k
 1971
MMS - ${{\mathit \pi}^{-}}{{\mathit p}}$ near ${{\mathit a}_{{2}}}$ threshold
$1299$ $\pm6$ 28k
 1971
MMS - 5 ${{\mathit \pi}^{-}}{{\mathit p}}$
$1300$ $\pm6$ 24k
 1971
MMS + 5 ${{\mathit \pi}^{+}}{{\mathit p}}$
$1309$ $\pm4$ 17k
 1971
MMS - 7 ${{\mathit \pi}^{-}}{{\mathit p}}$
$1306$ $\pm4$ 941
 1970
HBC + 7.0 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$
1  Statistical error negligible.
2  From a fit to $\mathit J{}^{P} = 2{}^{+}$ ${{\mathit \rho}}{{\mathit \pi}}$ partial wave.
3  Superseded by AGHASYAN 2018B.
4  From analysis of L3 data at $183 - 209$ GeV.

${{\mathit a}_{{2}}{(1320)}}$ mass, 3 ${{\mathit \pi}}$ mode (MeV)
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 ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$
 SCHEGELSKY 2006
EPJ A27 199 Partial Wave Analysis of ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Production in Two-Photon Collisions at LEP
 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 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 ${\mathrm {GeV/}}\mathit c$
 ACCIARRI 1997T
PL B413 147 Resonance Formation in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Final State in Two Photon Collisions
 ALBRECHT 1997B
ZPHY C74 469 A Partial Wave Analysis of the Reaction ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
 AMELIN 1996
ZPHY C70 71 Partial Wave Analysis of the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ at p$_{{{\mathit \pi}^{-}}}$ = 36 ${\mathrm {GeV/}}\mathit c$. Study of ${{\mathit a}_{{2}}{(1320)}}$ and ${{\mathit \omega}_{{3}}{(1670)}}$
 CONDO 1993
PR D48 3045 Further Results from Charge-Exchange Photoproduction
 ARMSTRONG 1990
ZPHY C48 213 A Study of the Centrally Produced ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ System Formed in the Reaction ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$) ${{\mathit p}_{{s}}}$ at 300 ${\mathrm {GeV/}}\mathit c$
 AUGUSTIN 1989
NP B320 1 Study of the ${{\mathit J / \psi}}$ Decay into Five Pions
 EVANGELISTA 1981
NP B178 197 Results from a ${{\mathit \pi}^{-}}{{\mathit p}}$ Slow Proton Trigger Experiment at 12 ${\mathrm {GeV/}}\mathit c$
 DAUM 1980C
PL 89B 276 ${{\mathit A}_{{2}}}$ Meson Production at 63 and 94 GeV in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit p}}$
 BALTAY 1978B
PR D17 62 Meson Resonance Production in ${{\mathit \pi}^{+}}{{\mathit p}}$ Interactions at 15 ${\mathrm {GeV/}}\mathit c$
 FERRERSORIA 1978
PL 74B 287 Backward Enhancement in the ${{\mathit A}_{{1}}}$ Region and ${{\mathit A}_{{2}}}$ Production in the Region ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$ $_{f}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ at 9 and 12 ${\mathrm {GeV/}}\mathit c$
 EMMS 1975
PL 58B 117 ${{\mathit A}_{{2}}^{0}}$ Production by Charge Exchange in ${{\mathit \pi}^{+}}{{\mathit n}}$ Interactions at 4 ${\mathrm {GeV/}}\mathit c$
 ANTIPOV 1973C
NP B63 153 ${{\mathit A}_{{1}}}$, ${{\mathit A}_{{2}}}$, and ${{\mathit A}_{{3}}}$ Production in ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit p}}$ at 25 and 40 ${\mathrm {GeV/}}\mathit c$
 CHALOUPKA 1973
PL 44B 211 Measurement of the Branching Ratios of the ${{\mathit A}_{{2}}}$ Meson Produced in 3.9 ${\mathrm {GeV/}}\mathit c$ ${{\mathit \pi}^{-}}{{\mathit p}}$ Interactions
 BINNIE 1971
PL 36B 257 ${{\mathit A}_{{2}}^{-}}$ Production in the Channel ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ near Threshold
 BOWEN 1971
PRL 26 1663 Measurements of the ${{\mathit A}_{{2}}^{-}}$ and ${{\mathit A}_{{2}}^{+}}$ Mass Spectra
 ALSTON-GARNJOST 1970
PL 33B 607 ${{\mathit A}_{{2}}}$ Mass Spectrum in 7 ${\mathrm {GeV/}}\mathit c$ ${{\mathit \pi}^{+}}{{\mathit p}}$ Interactions