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

INSPIRE   JSON  (beta) PDGID:
M017M
VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 1967 \pm16}$ OUR AVERAGE  Error includes scale factor of 2.1.  See the ideogram below.
$1935$ ${}^{+11}_{-13}$ 46M 1
AGHASYAN
2018B
 COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1900$ ${}^{+80}_{-20}$
ADOLPH
2015
COMP 191 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{(')}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1985$ $\pm10$ $\pm13$ 145k
LU
2005
B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$
$1996$ $\pm25$ $\pm43$
CHUNG
2002
B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit p}}$
$2000$ $\pm40$ ${}^{+60}_{-20}$
IVANOV
2001
B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}^{-}}{{\mathit p}}$
$2010$ $\pm20$ 2
ALDE
1996
GAM2 0 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit n}}$
$2040$ $\pm30$ 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. • •
$1885$ $\pm13$ ${}^{+50}_{-2}$ 420k 4
ALEKSEEV
2010
COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$
$2004$ $\pm6$ 80k 5
UMAN
2006
E835 5.2 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$2005$ ${}^{+25}_{-45}$ 6
ANISOVICH
2001F
 SPEC 2.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}}$, ${{\mathit \pi}^{0}}{{\mathit \eta}}$, ${{\mathit \pi}^{0}}{{\mathit \eta}^{\,'}}$
$1944$ $\pm8$ $\pm50$ 7
AMELIN
1999
VES 37 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit A}^{*}}$
$1903$ $\pm10$ 8
BALDI
1978
SPEC - 10 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}_S^0}$ ${{\mathit K}^{-}}$
$2030$ $\pm50$ 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.

           ${{\mathit a}_{{{4}}}{(1970)}}$ MASS (MeV)
References