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Abstract:

We perform a dispersive theoretical study of the reaction γ γ → π0 π0 emphasizing the low energy region. The large source of theoretical uncertainty to calculate the γ γ → π0 π0 total cross section for sqrt(s) ≳ 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 f0 (980) region. This allows us to make sharper predictions for the cross section for sqrt(s) ≲ 0.8   GeV, below the onset of D-wave contributions. In this way, were new more precise data on γ γ → π0 π0 available one might then distinguish between different parameterizations of the ππ isoscalar S-wave. We also elaborate on the width of the σ resonance to γγ and provide new values. © 2007 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Improved dispersion relations for γ γ → π0 π0
Autor:Oller, J.A.; Roca, L.; Schat, C.
Filiación:Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain
CONICET, Departamento de Física, FCEyN, Ciudad Universitaria, Pab. 1, 1428 Buenos Aires, Argentina
Año:2008
Volumen:659
Número:1-2
Página de inicio:201
Página de fin:208
DOI: http://dx.doi.org/10.1016/j.physletb.2007.11.030
Título revista:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Título revista abreviado:Phys Lett Sect B Nucl Elem Part High-Energy Phys
ISSN:03702693
CODEN:PYLBA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_03702693_v659_n1-2_p201_Oller.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v659_n1-2_p201_Oller

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Citas:

---------- APA ----------
Oller, J.A., Roca, L. & Schat, C. (2008) . Improved dispersion relations for γ γ → π0 π0. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 659(1-2), 201-208.
http://dx.doi.org/10.1016/j.physletb.2007.11.030
---------- CHICAGO ----------
Oller, J.A., Roca, L., Schat, C. "Improved dispersion relations for γ γ → π0 π0" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 659, no. 1-2 (2008) : 201-208.
http://dx.doi.org/10.1016/j.physletb.2007.11.030
---------- MLA ----------
Oller, J.A., Roca, L., Schat, C. "Improved dispersion relations for γ γ → π0 π0" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 659, no. 1-2, 2008, pp. 201-208.
http://dx.doi.org/10.1016/j.physletb.2007.11.030
---------- VANCOUVER ----------
Oller, J.A., Roca, L., Schat, C. Improved dispersion relations for γ γ → π0 π0. Phys Lett Sect B Nucl Elem Part High-Energy Phys. 2008;659(1-2):201-208.
http://dx.doi.org/10.1016/j.physletb.2007.11.030