# Helicity-0/Helicity-2 RATIO IN ${{\boldsymbol \gamma}}$ ${{\boldsymbol \gamma}}$ $\rightarrow$ ${{\boldsymbol f}_{{2}}{(1270)}}$ $\rightarrow$ ${{\boldsymbol \pi}}{{\boldsymbol \pi}}$ INSPIRE search

VALUE ($10^{-2}$) DOCUMENT ID TECN  COMMENT
$3.7$ $\pm0.3$ ${}^{+15.9}_{-2.9}$
 2008 A
BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$9.5$ $\pm1.8$ 1
 2014 A
RVUE Compilation
$13$ 2, 3
 2008
RVUE Compilation
$26$ 4, 3
 2008
RVUE Compilation
1  Based on a $\mathit K$-matrix analysis of BELLE data from MORI 2007 , UEHARA 2008A, UEHARA 2009 and UEHARA 2013 . The width is derived for the pole on the third sheet which is closest to the physical axis.
2  Solution A (preferred solution based on ${{\mathit \chi}^{2}}$-analysis).
3  Dispersion theory based amplitude analysis of BOYER 1990 , MARSISKE 1990 , BEHREND 1992 , and MORI 2007 .
4  Solution B (worse than solution A; still acceptable when systematic uncertainties are included).
References:
 DAI 2014A
PR D90 036004 Comprehensive Amplitude Analysis of ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ and ${{\overline{\mathit K}}}{{\mathit K}}$ below 1.5 GeV
 PENNINGTON 2008
EPJ C56 1 Amplitude Analysis of High Statistics Results on ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ and the Two Photon Width of Isoscalar States
 UEHARA 2008A
PR D78 052004 High-Statistics Measurement of Neutral-Pion Pair Production in Two-Photon Collisions