منابع مشابه
γγ cross - sections and γγ colliders 1
We summarize the predictions of different models for total γγ crosssections. The experimentaly observed rise of σγγ with √ sγγ, faster than that for σp̄p, 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...
متن کاملThe processes γγ → γγ , γZ , ZZ
The Standard Model contributions to the processes γγ → γγ, γZ and ZZ at sufficiently high energies, are found to be helicity conserving and almost purely imaginary. This is due to the W-loop contribution, which is much bigger than the fermionic ones at such energies. Thus the structure of these amplitudes acquires an impressive simplicity at high energies. Nothing like this appears in other pro...
متن کاملΓγ and Unitarity *
Agreement between the experimental value Γ(KS → γγ) and the number predicted via a one-loop chiral perturbation theory calculation has been cited as a success for the latter. On the other hand the one-loop prediction for the closely related process KL → π0γγ has been found to be a factor three below the experimental value. Using the inputs of unitarity and dispersion relations, we demonstrate t...
متن کامل, eγ AND γγ COLLIDERS
We calculate the cross sections for the single production of doubly-charged dileptons, both scalar and vector, at e + e − , eγ and γγ colliders at √ s = 500 GeV and 1 TeV. The eγ mode is by far the most promising – dileptons whose coupling is as weak as O(10 −4)α em can be observed, for masses virtually up to the kinematic limit. Dileptons of mass up to √ s can also be seen in e + e − and γγ co...
متن کاملCoupling at γγ Colliders
We study the constraints on the anomalous coupling gZ 5 that can be obtained from the analysis of the reaction γγ → WWZ at future linear ee colliders. We find out that a 0.5 (1) TeV ee collider operating in the γγ mode can probe values of gZ 5 of the order of 0.15 (4.5×10−2) for an integrated luminosity of 10 fb. This shows that the ability to search for this anomalous interaction of the γγ mod...
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ژورنال
عنوان ژورنال: Journal of the American Chemical Society
سال: 1921
ISSN: 0002-7863,1520-5126
DOI: 10.1021/ja01443a014