${{\boldsymbol a}_{{2}}{(1320)}}$ WIDTH

${{\boldsymbol \eta}}{{\boldsymbol \pi}}$ MODE INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 113.4 \pm1.3}$ OUR AVERAGE
$114.4$ $\pm1.6$ $\pm0.0$ 1
RODAS
2019
JPAC 191 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{(')}}{{\mathit \pi}^{-}}{{\mathit p}}$
$115$ $\pm20$
BARBERIS
2000H
450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}{{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit p}_{{s}}}$
$112$ $\pm14$
BARBERIS
2000H
450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}_{{f}}^{++}}{{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}_{{s}}}$
$112$ $\pm3$ $\pm2$ 2
AMSLER
1994D
CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$
$103$ $\pm6$ $\pm3$
BELADIDZE
1993
VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit N}}$
$112.2$ $\pm5.7$ 2561
DELFOSSE
1981
SPEC + ${{\mathit \pi}^{\pm}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{\pm}}{{\mathit \eta}}$
$116.6$ $\pm7.7$ 1653
DELFOSSE
1981
SPEC - ${{\mathit \pi}^{\pm}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{\pm}}{{\mathit \eta}}$
$108$ $\pm9$ 1000
KEY
1973
OSPK - 6 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \eta}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$112$ $\pm1$ $\pm8$ 3
JACKURA
2018
JPAC ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$
$119$ $\pm14$ 4
ADOLPH
2015
COMP 191 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{(')}}{{\mathit \pi}^{-}}{{\mathit p}}$
$110$ $\pm4$
ANISOVICH
2009
RVUE ${{\overline{\mathit p}}}{{\mathit p}}$ , ${{\mathit \pi}}{{\mathit N}}$
$127$ $\pm2$ $\pm2$ 5
THOMPSON
1997
MPS 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$
$118$ $\pm10$
ARMSTRONG
1993C
E760 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ $\rightarrow$ 6 ${{\mathit \gamma}}$
$104$ $\pm9$ 6200 6
CONFORTO
1973
OSPK - 6 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$ MM${}^{-}$
1  The coupled-channel analysis of both the ${{\mathit \eta}}{{\mathit \pi}}$ and ${{\mathit \eta}^{\,'}}{{\mathit \pi}}$ systems using ADOLPH 2015 data. The width is extracted from the T-matrix pole.
2  The systematic error of 2 MeV corresponds to the spread of solutions.
3  Superseded by RODAS 2019 .
4  ADOLPH 2015 value is derived from a Breit-Wigner fit with mass-dependent width taking the ${{\mathit \eta}}{{\mathit \pi}}$ and ${{\mathit \rho}}{{\mathit \pi}}$ channels into account.
5  Resolution is not unfolded.
6  Missing mass with enriched MMS = ${{\mathit \eta}}{{\mathit \pi}^{-}}$ , ${{\mathit \eta}}$ = 2${{\mathit \gamma}}$.
  References:
RODAS 2019
PRL 122 042002 Determination of the pole position of the lightest hybrid meson candidate
JACKURA 2018
PL B779 464 New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment
ADOLPH 2015
PL B740 303 Odd and Even Partial Waves of ${{\mathit \eta}}{{\mathit \pi}^{-}}$ and ${{\mathit \eta}^{\,'}}{{\mathit \pi}^{-}}$ in ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{{(')}}}{{\mathit \pi}^{-}}{{\mathit p}}$ at 191 GeV/$\mathit c$
ANISOVICH 2009
IJMP A24 2481 The Combined Analysis of ${{\mathit \pi}}$ ${{\mathit N}}$ $\rightarrow$ two mesons ${+}$ ${{\mathit N}}$ Reactions within Reggeon Exchanges and Data for ${{\mathit p}}$ ${{\overline{\mathit p}}}$ (at rest) $\rightarrow$ three mesons
BARBERIS 2000H
PL B488 225 A Study of the Centrally Produced ${{\mathit \eta}}{{\mathit \pi}^{0}}$ and ${{\mathit \eta}}{{\mathit \pi}^{-}}$ Systems in ${{\mathit p}}{{\mathit p}}$ Interactions at 450 ${\mathrm {GeV/}}\mathit c$
THOMPSON 1997
PRL 79 1630 Evidence for Exotic Meson Production in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$ at 18 ${\mathrm {GeV/}}\mathit c$
AMSLER 1994D
PL B333 277 Observation of a New $\mathit I\mathit G(\mathit J{}^{PC}) = 1{}^{-}(0{}^{++})$ Resonance at 1450 MeV
ARMSTRONG 1993C
PL B307 394 Evidence for ${{\mathit \eta}}{{\mathit \eta}}$ Resonances in Antiproton Proton Annihilations at 2950 $<$ $\sqrt {s }$ $<$ 3620 MeV
BELADIDZE 1993
PL B313 276 Study of ${{\mathit \pi}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit N}}$ and ${{\mathit \pi}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}^{-}}{{\mathit N}}$ Reactions at 37 ${\mathrm {GeV/}}\mathit c$
DELFOSSE 1981
NP B183 349 Production of ${{\mathit \rho}^{\pm}}$, ${{\mathit g}{(1700)}^{\pm}}$, ${{\mathit A}_{{2}}^{\pm}}$, ${{\mathit K}^{*}{(890)}^{\pm}}$ and ${{\mathit K}^{*}{(1420)}^{\pm}}$ at 50 ${\mathrm {GeV/}}\mathit c$
CONFORTO 1973
PL 45B 154 Missing Mass Analysis of the ${{\mathit A}_{{2}}^{-}}$ at 6.0 ${\mathrm {GeV/}}\mathit c$
KEY 1973
PRL 30 503 Study of the Decay ${{\mathit A}_{{2}}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}$ via the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$ at 6.0 ${\mathrm {GeV/}}\mathit c$