Flavour structure of low-energy hadron pair photoproduction

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dc.creatorOdagiri, K.
dc.creatorVerma, R. C.
dc.date2005-08-10
dc.date2007-05-28
dc.date.accessioned2026-07-07T11:26:45Z
dc.date.available2026-07-07T11:26:45Z
dc.descriptionWe consider the process $γγ\to H_1\bar H_2$ where $H_1$ and $H_2$ are either mesons or baryons. The experimental findings for such quantities as the $p\bar p$ and $K_SK_S$ differential cross sections, in the energy range currently probed, are found often to be in disparity with the scaling behaviour expected from hard constituent scattering. We discuss the long-distance pole--resonance contribution in understanding the origin of these phenomena, as well as the amplitude relations governing the short-distance contribution which we model as a scaling contribution. When considering the latter, we argue that the difference found for the $K_SK_S$ and the $K^+K^-$ integrated cross sections can be attributed to the s-channel isovector component. This corresponds to the $ρω\to a$ subprocess in the VMD (vector-meson-dominance) language. The ratio of the two cross sections is enhanced by the suppression of the $ϕ$ component, and is hence constrained. We give similar constraints to a number of other hadron pair production channels. After writing down the scaling and pole--resonance contributions accordingly, the direct summation of the two contributions is found to reproduce some salient features of the $p\bar p$ and $K^+K^-$ data.
dc.description12 pages, 9 figures, revised version to be published in EPJC
dc.identifierhttps://arxiv.org/abs/hep-ph/0508114
dc.identifierhttp://arxiv.org/abs/hep-ph/0508114
dc.identifierEur.Phys.J.C52:159-171,2007
dc.identifierdoi:10.1140/epjc/s10052-007-0337-0
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195932
dc.subjectHigh Energy Physics - Phenomenology
dc.titleFlavour structure of low-energy hadron pair photoproduction
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