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

VALUE (MeV)

EVTS

DOCUMENT ID

TECN

COMMENT

$\bf{ 1705 \pm40}$

OUR AVERAGE

$1722$ $\pm15$ $\pm67$

RODAS

2019

JPAC

191 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{(')}}{{\mathit \pi}^{-}}{{\mathit p}}$

$1698$ $\pm44$

AMSLER

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. • • •

$1681$ ${}^{+22}_{-35}$

46M

³ ^{, 4}

AGHASYAN

2018

COMP

190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$

$1720$ $\pm10$ $\pm60$

⁵

JACKURA

2018

JPAC

${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$

$1726$ $\pm12$ $\pm25$

⁴

ABLIKIM

2017

BES3

${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$

$1675$ $\pm25$

ANISOVICH

2009

RVUE

0.0 ${{\overline{\mathit p}}}{{\mathit p}}$ , ${{\mathit \pi}}{{\mathit N}}$

$1722$ $\pm9$ $\pm15$

18k

⁶

SCHEGELSKY

2006

RVUE

${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$

$1702$ $\pm7$

80k

⁷

UMAN

2006

E835

5.2 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$

$1721$ $\pm13$ $\pm44$

145k

2005

B852

18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$

$1737$ $\pm5$ $\pm7$

ABE

2004

BELL

10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$

$1767$ $\pm14$

221

⁸

ACCIARRI

2001

${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ , ${\it{}E}^{\it{}ee}_{\rm{}cm}$= 91, $183 - 209$ GeV

$1660$ $\pm40$

⁴

ABELE

1999

CBAR

$1.94$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$

$\sim$$1775$

⁹

GRYGOREV

1999

SPEC

40 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit n}}$

$1752$ $\pm21$ $\pm4$

ACCIARRI

1997

${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$

¹ The coupled-channel analysis of both the ${{\mathit \eta}}{{\mathit \pi}}$ and ${{\mathit \eta}^{\,'}}{{\mathit \pi}}$ systems using ADOLPH 2015 data. The mass is extracted from the T-matrix pole.

² T-matrix pole.

³ Statistical error negligible.

⁴ Breit-Wigner mass.

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.

⁹ Possibly two $\mathit J{}^{P} = 2{}^{+}$ resonances with isospins 0 and 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/$\mathit c$

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 ${\mathrm {GeV/}}\mathit c{}^{2}$

GRYGOREV

1999

PAN 62 470

Investigation of a Resonance Structure in the System of Two ${{\mathit K}_S^0}$ Mesons in the Mass Region Around 1775 MeV

ACCIARRI

1997T

PL B413 147

Resonance Formation in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Final State in Two Photon Collisions