Unparticle physics at the photon collider

Details Unparticle physics at the photon collider Unparticle physics at the photon collider

2007-12-29

arxiv.org/abs/0801.0018v3

Phys.Rev.D77:094012,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 16 figures; version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.094012

Recently, a conceptually new physics beyond the Standard Model (SM), unparticle, has been proposed, where a hidden conformal sector is coupled to the SM sector through higher dimensional operators. In this setup, we investigate unparticle physics at the photon collider, in particular, unparticle effects on the gamma gamma to gamma gamma process. Since this process occurs at loop level in the SM, the unparticle effects can be significant even if the cutoff scale is very high. In fact, we find that the unparticle effects cause sizable deviations from the SM results. The scaling dimension of the unparticle d_U reflects the dependence of the cross section on the final state photon invariant mass, so that precision measurements of this dependence may reveal the scaling dimension of the unparticle.

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