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S. M. Lietti C. A. de S. Pires 《The European Physical Journal C - Particles and Fields》2004,35(1):137-143
In this work, we investigate the sensitivity of the process
at LHC for the photonic 3- and 4-point functions that appear in non-commutative QED. We show that this process serves to study the behavior of the space-space as well as of the space-time non-commutativity. We also show that this process can probe the non-commutative scale
in the range of a few TeV.Received: 9 February 2004, Revised: 27 February 2004, Published online: 8 April 2004 相似文献
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The forward elastic scattering of light on light, i.e., the reaction in the forward direction, is analyzed utilizing real analytic amplitudes. We calculate , the ratio of the real to the imaginary portion of the forward scattering amplitude, by fitting the total cross section data in the high energy region 5 GeV GeV, assuming a cross section that rises asymptotically as ln2 s. We then compare , the ratio of the even portions of the pp and forward scattering amplitudes, as well as to [1], the value for Compton scattering. Within errors, we find that the three -values in the c.m.s. energy region 5 GeV 130 GeV are the same, as predicted by a factorization theorem of Block and Kaidalov [2].
Received: 18 June 2002 / Published online: 9 August 2002 相似文献
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Boyer J Burke DL Butler F Gidal G Abrams GS Amidei D Baden AR Barklow T Boyarski AM Breidenbach M Burchat P Dorfan JM Feldman GJ Gladney L Gold MS Goldhaber G Golding LJ Haggerty J Hanson G Hayes K Herrup D Hollebeek RJ Innes WR Jaros JA Juricic I Kadyk JA Karlen D Klein SR Lankford AJ Larsen RR LeClaire BW Levi ME Lockyer NS Lüth V Matteuzzi C Nelson ME Ong RA Perl ML Richter B Riles K Ross MC Rowson PC Schaad T Schellman H Schmidke WB Sheldon PD Smith JR Trilling GH de la Vaissiere C Wood DR 《Physical review letters》1986,56(3):207-210
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G.J. Gounaris P.I. Porfyriadis F.M. Renard 《The European Physical Journal C - Particles and Fields》1999,9(4):673-686
We study the helicity amplitudes of the process at high energy, which in the standard and SUSY models first arise at the one-loop order. In the standard model (SM), the
diagrams involve , charged-quark, and lepton loops, while in SUSY, we also have contributions from chargino-, charged-sfermion, and Higgs-loop
diagrams. The SUSY contributions are most important in the region above the threshold for producing the supersymmetric partners;
there, they interfere most effectively with the primarily imaginary SM amplitudes. Simple expressions for the relevant one-loop
functions are given which provide a direct overview of the behaviour of the helicity amplitudes in the whole parameter space
at high energies. The various characteristics of a large set of observables are studied in detail.
Received: 3 February 1999 / Pulished online: 30 June 1999 相似文献
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