Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unparticle physics at the photon collider   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.

26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an