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

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dc.creatorOller, Jose A.
dc.creatorRoca, Luis
dc.creatorSchat, Carlos
dc.date2007-08-13
dc.date2007-11-06
dc.date.accessioned2026-07-07T11:41:50Z
dc.date.available2026-07-07T11:41:50Z
dc.descriptionWe perform a dispersive theoretical study of the reaction γγ\to pi^0π^0 emphasizing the low energy region. The large source of theoretical uncertainty to calculate the γγ\toπ^0π^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 γγ\toπ^0π^0 available one might then distinguish between different parameterizations of the ππisoscalar S-wave. We also elaborate on the width of the σresonance to γγand provide new values.
dc.description10 pages, 5 figures. Extended discussion on the width of the sigma to gamma gamma
dc.identifierhttps://arxiv.org/abs/0708.1659
dc.identifierhttp://arxiv.org/abs/0708.1659
dc.identifierPhys.Lett.B659:201-208,2008
dc.identifierdoi:10.1016/j.physletb.2007.11.030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200676
dc.subjectHigh Energy Physics - Phenomenology
dc.titleImproved dispersion relations for γγ\to π^0π^0
dc.typetext

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