# ${{\boldsymbol a}_{{2}}{(1700)}}$ WIDTH INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 258 \pm40}$ OUR AVERAGE
$247$ $\pm17$ $\pm63$ 1
 2019
JPAC 191 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{(')}}{{\mathit \pi}^{-}}{{\mathit p}}$
$265$ $\pm55$ 2
 2002
CBAR $0.9$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$436$ ${}^{+20}_{-16}$ 46M 3, 4
 2018 B
COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$280$ $\pm10$ $\pm70$ 5
 2018
JPAC ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$
$190$ $\pm18$ $\pm30$ 4
 2017 K
BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$270$ ${}^{+50}_{-20}$
 2009
RVUE 0.0 ${{\overline{\mathit p}}}{{\mathit p}}$ , ${{\mathit \pi}}{{\mathit N}}$
$336$ $\pm20$ $\pm20$ 18k 6
 2006
RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$417$ $\pm19$ 80k 7
 2006
E835 5.2 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$279$ $\pm49$ $\pm66$ 145k
 2005
B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$
$151$ $\pm22$ $\pm24$
 2004
BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
$187$ $\pm60$ 221 8
 2001 H
L3 ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ , ${\it{}E}^{\it{}ee}_{\rm{}cm}$= 91, $183 - 209$ GeV
$280$ $\pm70$ 4
 1999 B
CBAR $1.94$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$
$150$ $\pm110$ $\pm34$
 1997 T
L3 ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
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  T-matrix pole.
3  Statistical error negligible.
4  Breit-Wigner width.
5  Superseded by RODAS 2019 .
6  From analysis of L3 data at $183 - 209$ GeV.
7  Statistical error only.
8  Spin 2 dominant, isospin not determined, could also be $\mathit I$=1.
References:
 RODAS 2019
PRL 122 042002 Determination of the pole position of the lightest hybrid meson candidate
 AGHASYAN 2018B
PR D98 092003 Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$
 JACKURA 2018
PL B779 464 New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment
 ABLIKIM 2017K
PR D95 032002 Amplitude Analysis of the ${{\mathit \chi}_{{c1}}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decays
 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
 SCHEGELSKY 2006
EPJ A27 199 Partial Wave Analysis of ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Production in Two-Photon Collisions at LEP
 UMAN 2006
PR D73 052009 Light Quark Resonances in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilations at 5.2 GeV/$\mathit c$
 LU 2005
PRL 94 032002 Exotic Meson Decay to ${{\mathit \omega}}{{\mathit \pi}^{0}}{{\mathit \pi}^{-}}$
 ABE 2004
EPJ C32 323 Measurement of ${{\mathit K}^{+}}{{\mathit K}^{-}}$ Production in Two Photon Collisions in the Resonant Mass Region
 AMSLER 2002
EPJ C23 29 Proton-Antiproton Annihilation at 900 ${\mathrm {MeV}}/\mathit c$ into ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$, ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$, and ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$
 ACCIARRI 2001H
PL B501 173 ${{\mathit K}_S^0}{{\mathit K}_S^0}$ Final State in Two Photon Collisions and Implications for Glueballs
 ABELE 1999B
EPJ C8 67 Observation of Resonances in the Reaction ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ at 1.94 ${\mathrm {GeV/}}\mathit c{}^{2}$
 ACCIARRI 1997T
PL B413 147 Resonance Formation in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Final State in Two Photon Collisions