${{\mathit a}_{{4}}{(1970)}}$ WIDTH

INSPIRE   PDGID:
M017W
VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 324 {}^{+15}_{-18}}$ OUR AVERAGE
$333$ ${}^{+16}_{-21}$ 46M 1
AGHASYAN
2018B
 COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$300$ ${}^{+80}_{-100}$
ADOLPH
2015
COMP 191 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{(')}}{{\mathit \pi}^{-}}{{\mathit p}}$
$231$ $\pm30$ $\pm46$ 145k
LU
2005
B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$
$298$ $\pm81$ $\pm85$
CHUNG
2002
B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$
$350$ $\pm100$ ${}^{+70}_{-50}$
IVANOV
2001
B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}^{-}}{{\mathit p}}$
$370$ $\pm80$ 2
DONSKOV
1996
GAM2 0 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit n}}$
$380$ $\pm150$ 3
CLELAND
1982B
 SPEC $\pm{}$ 50 ${{\mathit \pi}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit p}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$294$ $\pm25$ ${}^{+46}_{-19}$ 420k 4
ALEKSEEV
2010
COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$
$401$ $\pm16$ 80k 5
UMAN
2006
E835 5.2 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$180$ $\pm30$ 6
ANISOVICH
2001F
 SPEC 2.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}}$ , ${{\mathit \pi}^{0}}{{\mathit \eta}}$ , ${{\mathit \pi}^{0}}{{\mathit \eta}^{\,'}}$
$324$ $\pm26$ $\pm75$ 7
AMELIN
1999
VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit A}^{*}}$
$166$ $\pm43$ 8
BALDI
1978
SPEC - 10 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}_S^0}$ ${{\mathit K}^{-}}$
$510$ $\pm200$ 9
CORDEN
1978C
 OMEG 0 15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit n}}$
1  Statistical error negligible.
2  From a simultaneous fit to the $\mathit G_{+}$ and $\mathit G_{0}$ wave intensities.
3  From an amplitude analysis.
4  Superseded by AGHASYAN 2018B.
5  Statistical error only.
6  From the combined analysis of ANISOVICH 1999C, ANISOVICH 1999E, and ANISOVICH 2001F.
7  May be a different state.
8  From a fit to the $\mathit Y{}^{0}_{8}$ moment. Limited by phase space.
9  $\mathit J{}^{P} = 4{}^{+}$ is favored, though $\mathit J{}^{P} = 2{}^{+}$ cannot be excluded.
References:
AGHASYAN 2018B
PR D98 092003 Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$
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/$\mathit c$
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 ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$
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 ${{\mathit \omega}}{{\mathit \pi}^{0}}{{\mathit \pi}^{-}}$
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/$\mathit c$
ANISOVICH 2001F
PL B517 261 Partial Wave Analysis of ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation Channels in Flight with $\mathit I = 1,\mathit C$=+1
IVANOV 2001
PRL 86 3977 Observation of Exotic Meson Production in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}^{-}}{{\mathit p}}$ at 18 ${\mathrm {GeV/}}\mathit c$
AMELIN 1999
PAN 62 445 Investigation of the Reaction ${{\mathit \pi}^{-}}$ ${+}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{+}$ ${{\mathit A}}$
DONSKOV 1996
PAN 59 982 Observation of ${{\mathit a}_{{4}}{(2040)}^{0}}$ Meson in the ${{\mathit \eta}}{{\mathit \pi}^{0}}$ Decay Channel
CLELAND 1982B
NP B208 228 Resonance Production in the Reaction ${{\mathit \pi}^{\pm}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit p}}$ at 30 and 50 ${\mathrm {GeV/}}\mathit c$
BALDI 1978
PL 74B 413 Observation of a Spin = 4, Isospin = 1, Meson Resonance
CORDEN 1978C
NP B136 77 A Partial Wave Analysis of the Neutral 3${{\mathit \pi}}$ System Produced in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$) ${{\mathit n}}$ at 12 and 15 ${\mathrm {GeV/}}\mathit c$