# ${{\boldsymbol \pi}{(1800)}}$ MASS INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 1810 {}^{+9}_{-11}}$ OUR AVERAGE  Error includes scale factor of 2.2.
$1804$ ${}^{+6}_{-9}$ 46M 1
 2018 B
COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1876$ $\pm18$ $\pm16$ 4k 2
 2008
B852 - 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1774$ $\pm18$ $\pm20$ 3
 2002
B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1863$ $\pm9$ $\pm10$ 4
 2002
B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1840$ $\pm10$ $\pm10$ 1.2k
 1996 B
VES - 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit A}}$
$1775$ $\pm7$ $\pm10$ 5
 1995 B
VES - 36 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$
$1790$ $\pm14$ 6
 1994
VES - 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}{{\mathit A}}$
$1873$ $\pm33$ $\pm20$
 1992 C
VES - 36 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Be}$ ${{\mathit \pi}^{-}}$ ${{\mathit \eta}^{\,'}}$ ${{\mathit \eta}}$ ${}^{}\mathrm {Be}$
$1814$ $\pm10$ $\pm23$ 426
 1991
VES - 36 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \eta}}{{\mathit \eta}}{}^{}\mathrm {C}$
$1770$ $\pm30$ 1.1k
 1982
SPEC - 40 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {A}$ $\rightarrow$ 3 ${{\mathit \pi}}{}^{}\mathrm {A}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1785$ $\pm9$ ${}^{+12}_{-6}$ 420k 7
 2010
COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$
$1737$ $\pm5$ $\pm15$
 1999
VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit A}^{*}}$
1  Statistical error negligible.
2  From a single-pole fit.
3  In the ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}}$ wave.
4  In the ${{\mathit f}_{{0}}{(500)}}{{\mathit \pi}}$ wave.
5  From a fit to $\mathit J{}^{PC} = 0{}^{-+}$ ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}}$ , ${{\mathit f}_{{0}}{(1370)}}{{\mathit \pi}}$ waves.
6  From a fit to $\mathit J{}^{PC} = 0{}^{-+}$ ${{\mathit K}_{{0}}^{*}{(1430)}}{{\mathit K}^{-}}$ and ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}^{-}}$ waves.
7  Superseded by AGHASYAN 2018B.

${{\mathit \pi}{(1800)}}$ mass (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 ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$
 EUGENIO 2008
PL B660 466 Observation of the ${{\mathit \pi}{(1800)}}$ and ${{\mathit \pi}_{{2}}{(1880)}}$ Mesons in ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{-}}$ Decay
 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/$\mathit c$
 AMELIN 1999
PAN 62 445 Investigation of the Reaction ${{\mathit \pi}^{-}}$ ${+}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{+}$ ${{\mathit A}}$
 AMELIN 1996B
PAN 59 976 Study of Diffractive Reaction ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit A}}$ at the Momentum P$_{{{\mathit \pi}^{-}}}$ = 37 ${\mathrm {GeV/}}\mathit c$
 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 ${\mathrm {GeV/}}\mathit c$
SJNP 55 1535 Study of the Process ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}{{\mathit \eta}}{{\mathit A}}$ at 36 ${\mathrm {GeV/}}\mathit c$
PL B268 137 Observation of Resonance with Mass M = 1814 MeV Decaying into ${{\mathit \pi}^{-}}{{\mathit \eta}}{{\mathit \eta}}$
PRL 48 1697 Evidence for New $0{}^{-}{}^{}$ S Resonances in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ Systems