${{\mathit f}_{{{2}}}{(1270)}}$ MASS

INSPIRE   PDGID:
M005M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 1275.4 \pm0.8}$ OUR AVERAGE  Error includes scale factor of 1.1.
$1275.8$ $\pm1.0$ $\pm0.4$ 1
BOGOLYUBSKY
2013
SPEC 7${{\mathit \pi}^{+}}({{\mathit K}^{+}},{{\mathit p}}$) ${{\mathit A}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}{+}$ ${{\mathit X}}$
$1262$ ${}^{+1}_{-2}$ $\pm8$ 2
ABLIKIM
2006V
BES2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1275$ $\pm15$
ABLIKIM
2005
BES2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1283$ $\pm5$
ALDE
1998
GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$
$1272$ $\pm8$ 200k
PROKOSHKIN
1994
GAM2 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$
$1269.7$ $\pm5.2$ 5730
AUGUSTIN
1989
DM2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 5 ${{\mathit \pi}}$
$1283$ $\pm8$ $400$ 3
ALDE
1987
GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 4 ${{\mathit \pi}^{0}}{{\mathit n}}$
$1274$ $\pm5$ 3
AUGUSTIN
1987
DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1283$ $\pm6$ 4
LONGACRE
1986
MPS 22 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit K}_S^0}$
$1276$ $\pm7$
COURAU
1984
DLCO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1273.3$ $\pm2.3$ 5
CHABAUD
1983
ASPK 17 ${{\mathit \pi}^{-}}{{\mathit p}}$ polarized
$1280$ $\pm4$ 6
CASON
1982
STRC 8 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}^{++}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$
$1281$ $\pm7$ $11600$
GIDAL
1981
MRK2 ${{\mathit J / \psi}}$ decay
$1282$ $\pm5$ 7
CORDEN
1979
OMEG 12$-$15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}}$
$1269$ $\pm4$ 10k
APEL
1975
NICE 40 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}^{0}}$
$1272$ $\pm4$ 4600
ENGLER
1974
DBC 6 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$1277$ $\pm4$ 5300
FLATTE
1971
HBC 7.0 ${{\mathit \pi}^{+}}{{\mathit p}}$
$1273$ $\pm8$ 3
STUNTEBECK
1970
HBC 8 ${{\mathit \pi}^{-}}{{\mathit p}}$, 5.4 ${{\mathit \pi}^{+}}{{\mathit d}}$
$1265$ $\pm8$
BOESEBECK
1968
HBC 8 ${{\mathit \pi}^{+}}{{\mathit p}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$1257$ $\pm6$ 8
KLEMPT
2022
RVUE ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ , ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$
$1263$ $\pm12$
CARVER
2021
CLAS ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit p}}$
$1259$ $\pm4$ $\pm4$ 1.7k 9, 10
DOBBS
2015
${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1267$ $\pm4$ $\pm3$ 1.5k 9, 10
DOBBS
2015
${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1277$ $\pm6$ 870 11
SCHEGELSKY
2006A
RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$
$1251$ $\pm10$
TIKHOMIROV
2003
SPEC 40.0 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit K}_L^0}$ X
$1260$ $\pm10$ 12
ALDE
1997
GAM2 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$
$1278$ $\pm6$ 12
GRYGOREV
1996
SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ X
$1262$ $\pm11$
AGUILAR-BENIT..
1991
EHS 400 ${{\mathit p}}{{\mathit p}}$
$1275$ $\pm10$
AKER
1991
CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}}$
$1220$ $\pm10$
BREAKSTONE
1990
SFM ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1288$ $\pm12$
ABACHI
1986B
HRS ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ X
$1284$ $\pm30$ 3k
BINON
1983
GAM2 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \eta}}$
$1280$ $\pm20$ 3k
APEL
1982
CNTR 25 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}^{0}}$
$1284$ $\pm10$ 16000
DEUTSCHMANN
1976
HBC 16 ${{\mathit \pi}^{+}}{{\mathit p}}$
$1258$ $\pm10$ 600
TAKAHASHI
1972
HBC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}}$
$1275$ $\pm13$
ARMENISE
1970
HBC 9 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1261$ $\pm5$ 1960 3
ARMENISE
1968
DBC 5.1 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}$ MM${}^{-}$
$1270$ $\pm10$ 360 3
ARMENISE
1968
DBC 5.1 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{0}}$ MM
$1268$ $\pm6$ 13
JOHNSON
1968
HBC 3.7$-$4.2 ${{\mathit \pi}^{-}}{{\mathit p}}$
1  Averaged over six nuclear targets, no statistically significant dependence on target nucleus observed.
2  Breit-Wigner mass.
3  Mass errors enlarged by us to $\Gamma /\sqrt {\mathit N }$; see the note with the ${{\mathit K}^{*}{(892)}}$ mass.
4  From a partial-wave analysis of data using a K-matrix formalism with 5 poles.
5  From an energy-independent partial-wave analysis.
6  From an amplitude analysis of the reaction ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$ $\rightarrow$ 2 ${{\mathit \pi}^{0}}$.
7  From an amplitude analysis of ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ scattering data.
8  Fit of the tensor partial waves from BES3 in the multipole basis.
9  Using CLEO-c data but not authored by the CLEO Collaboration.
10  From a fit to a Breit-Wigner line shape with fixed $\Gamma $ = 185 MeV.
11  From analysis of L3 data at 91 and $183 - 209$ GeV.
12  Systematic uncertainties not estimated.
13  JOHNSON 1968 includes BONDAR 1963, LEE 1964, DERADO 1965, EISNER 1967.
References