γγ Cross-sections and γγ colliders

Godbole, Rohini M. ; Pancheri, G. (2001) γγ Cross-sections and γγ colliders Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 472 (1-2). pp. 205-211. ISSN 0168-9002

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0168-9002(01)01184-6

Abstract

We summarize the predictions of different models for total γγ cross sections. The experimentaly observed rise of σγγ with √sγγ, faster than that for σ̅pp, σγp is in agreement with the predictions of the Eikonalized Minijet Models as opposed to those of the Regge-Pomeron models. We then show that a measurement of σγγ with an accuracy of ≲ / 8- 9%(6 - 7%) is necessary to distinguish among different Regge-Pomeron type models (among the different parametrisations of the EMM models) and a precision of ≲ / 20% is required to distinguish among the predictions of the EMMs and of those models which treat like 'photon like a proton', for the energy range 300 < √sγγ < 500 GeV. We further show that the difference in model predictions for σγγ of about a factor 2 at √sγγ = 700 GeV reduces to ~30% when folded with bremsstrahlung γ spectra to calculate σ(e+e- → e+e-γγ e+e-X). We point out then the special role that γγ colliders can play in shedding light on this all-important issue of calculation of total hadronic cross-sections.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:93656
Deposited On:22 Jun 2012 09:49
Last Modified:19 May 2016 06:42

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