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${{\mathit f}_{{2}}{(1270)}}$ $\Gamma\mathrm {(i)}{}\Gamma\mathrm {( {{\mathit \gamma}} {{\mathit \gamma}} )}/\Gamma\mathrm {(total)}$

Helicity-0/Helicity-2 RATIO IN ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit f}_{{2}}{(1270)}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$

INSPIRE   PDGID:

M005HR0

VALUE ($ 10^{-2} $) DOCUMENT ID TECN  COMMENT $3.7$ $\pm0.3$ ${}^{+15.9}_{-2.9}$ UEHARA 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 DAI 2014 A RVUE Compilation $13$ 2, 3 PENNINGTON 2008 RVUE Compilation $26$ 4, 3 PENNINGTON 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

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