Improved dispersion relations for γγ\to π^0π^0

Details Improved dispersion relations for γγ\to π^0π^0 Improved dispersion relations for γγ\to π^0π^0

2007-08-13

arxiv.org/abs/0708.1659v2

Phys.Lett.B659:201-208,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures. Extended discussion on the width of the sigma to gamma gamma

Scientific paper

10.1016/j.physletb.2007.11.030

We perform a dispersive theoretical study of the reaction \gamma\gamma\to pi^0\pi^0 emphasizing the low energy region. The large source of theoretical uncertainty to calculate the \gamma\gamma\to\pi^0\pi^0 total cross section for \sqrt{s}\gtrsim 0.5 GeV within the dispersive approach is removed. This is accomplished by taking one more subtraction in the dispersion relations, where the extra subtraction constant is fixed by considering new low energy constraints, one of them further refined by taking into consideration the f_0(980) region. This allows us to make sharper predictions for the cross section for \sqrt{s}\lesssim 0.8 GeV, below the onset of D-wave contributions. In this way, were new more precise data on \gamma\gamma\to\pi^0\pi^0 available one might then distinguish between different parameterizations of the \pi\pi isoscalar S-wave. We also elaborate on the width of the \sigma resonance to \gamma\gamma and provide new values.

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