^{1}

^{*}

^{1}

^{*}

^{1}

^{1}

In this work, we study the effects of the spin-0 unparticle on γγ → γγ process. From the numerical results, we show that the cross section with unparticle effect should be about 10
^{27} - 10
^{30} times larger than the one that is confirmed by QED calculation. This could have important implications for unparticle searches and for the measurement of the photon-photon cross section.

Photon-photon scattering is among the most important and carefully studied processes in particle physics [^{20} times larger than the one without radion effects. It is well known that Georgi [

The γγ u vertex is given by

The spin-0 unparticle propagator is [

where

and

The angular distribution is [

From (4), the total cross section is found to be [

We now turn to the numerical analysis of the total cross sections. The input parameters are

It is to be noticed that in refs. [

Next, in ref. [

with

where

The form factors are given by

with

The important property of

From this, we have found that the effects of the radion can be strong. Interestingly, we have shown that the cross section with radion effect should be about 10^{20} times larger than the one without radion and unparticle effects. Now, by the results just mentioned we give the numerical values of the ratio of the total cross section with unparticle effects

So, direct computations have showed that the above cross section of (5) should be about 10^{27} - 10^{30} times larger than the one in (7).

Finally, we have obtained the ratio of the cross section with unparticle effects

300 | 228.02 | 62.73 | 28.78 | 5.85 | 1.75 |

500 | |||||

800 | |||||

1000 | |||||

3000 |

300 | 31.35 | 8.63 | 3.96 | 0.76 | 0.24 |

500 | 106.85 | 36.03 | 20.30 | 4.83 | 1.86 |

800 | 330.44 | 134.43 | 91.38 | 26.22 | 12.20 |

1000 | 564.49 | 251.10 | 186.61 | 58.54 | 29.78 |

3000 |

300 | 58.31 | 16.04 | 7.36 | 1.43 | 0.45 |

500 | 163.92 | 55.27 | 31.14 | 7.41 | 2.85 |

800 | 246.21 | 100.16 | 68.08 | 19.53 | 9.09 |

1000 | 282.32 | 125.58 | 93.32 | 29.27 | 14.89 |

3000 | 471.01 | 325.12 | 374.94 | 182.52 | 144.03 |

It has already been shown that the total cross section

To conclude, in this letter we have studied the unparticle effects on gamma gamma scattering. From numerical results, we have found that the effects of the unparticle on the cross sections can be very strong. If the measure- ment is carried out at

Trieu QuynhTrang,Ha HuyBang,Nguyen ThuHuong,Sa Thi LanAnh, (2015) On Unparticle Searches through Photon-Photon Scattering. Journal of Modern Physics,06,1798-1802. doi: 10.4236/jmp.2015.613183