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Production of $\pi^0 \pi^0$ and $\pi^0 \eta$ in Photon - Photon Collisions

Phys.Lett. B110 (1982) 82-86, 1982

Abstract (data abstract)
SLAC-SPEAR. CRYSTAL BALL DETECTOR. INVESTIGATION OF THE FOUR-PHOTON FINAL STATE IN GAMMA GAMMA COLLISIONS IN E+ E- INTERACTIONS. F(1270) RESONANCE IS OBSERVED IN THE PI0 PI0 CHANNEL WITH PREDOMINANTLY HELICITY 2 AND A MEASURE OF THE PARTIAL WIDTH TO GAMMA GAMMA IS 2.9 +0.6, -0.4 (DSYS=0.6) KEV INDEPENDENT OF ASSUMPTIONS ON HELICITY. A2(1310) RESONANCE IS OBSERVED IN THE PI0 ETA CHANNEL WITH A PARTIAL WIDTH TO GAMMA GAMMA OF 0.77 +- 0.18 (DSYS=0.27) KEV (ASSUMING HELECITY 2). AN UPPER LIMIT OF & lt;5 PCT (95 PCT CL) IS GIVEN FOR BRANCHING RATIOS OF F --& gt; ETA ETA/F --& gt; PI PI.

• #### Table 1

Data from F3

10.17182/hepdata.30959.v1/t1

Data read from graph. Systematic error on M is of order of 2% or less.

• #### Table 2

Data from F 4

10.17182/hepdata.30959.v1/t2