#### $\mathbf {{{\mathit X}{(2000)}} }$ $\mathit I{}^{G}(\mathit J{}^{PC}) = 1{}^{-}(?{}^{?+})$

MASS ${\mathrm {(MeV)}}$ WIDTH ${\mathrm {(MeV)}}$ DOCUMENT ID TECN CHG  COMMENT
$1964 \pm35$ $225 \pm50$ 1
 1993 D
E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}}$ $\rightarrow$ 6 ${{\mathit \gamma}}$
$\sim2100$ $\sim500$ 1
 1977
CIBS - 25 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \rho}_{{3}}}$
$2214 \pm15$ $355 \pm21$ 2
 1977
HBC 0 15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}^{++}}$3 ${{\mathit \pi}}$
$2080 \pm40$ $340 \pm80$
 1975
HBC + 15 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \rho}_{{3}}}$
 1 Cannot determine spin to be 3.
 2 BALTAY 1977 favors $\mathit J{}^{P}$.
References:
 ARMSTRONG 1993D
PL B307 399 Production of the ${{\mathit f}_{{2}}{(1520)}}$ Resonance in Antiproton Proton Annihilation at $\sqrt {s }$ = 2980 and 3526 MeV
 ANTIPOV 1977
NP B119 45 Boson States in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit p}}$ with Leading ${{\mathit \pi}^{+}}$ Meson at 25 ${\mathrm {GeV/}}\mathit c$
 BALTAY 1977
PRL 39 591 Diffractive and Nondiffractive ${{\mathit A}_{{1}}}$ , ${{\mathit A}_{{3}}}$ and ${{\mathit A}_{{4}}}$ Production in ${{\mathit \pi}^{+}}{{\mathit p}}$ Interactions at 15 ${\mathrm {GeV/}}\mathit c$
 KALELKAR 1975
Thesis Nevis 207 Meson Resonance Production in 15 ${\mathrm {GeV/}}\mathit c$ ${{\mathit \pi}^{+}}$ Interactions with Liquid Hydrogen