Extra Dimensions and Higgs Pair Production at Photon Colliders

TL;DR

This paper demonstrates that extra dimensions can significantly enhance Higgs pair production at photon colliders, offering a promising way to test new physics beyond the Standard Model.

Contribution

It shows how extra dimensions with a scale around 1.5 TeV can greatly increase Higgs pair production cross sections at photon colliders, surpassing Standard Model predictions.

Findings

Cross sections up to 0.11 pb for monochromatic photons at 0.5 TeV.

Cross sections up to 1.5 pb at 1 TeV for monochromatic photons.

Enhanced Higgs pair production signals compared to Standard Model expectations.

Abstract

We show that new physics effects due to extra dimensions can dramatically affect Higgs pair production at photon colliders. We find that the cross section due to extra dimensions with the scale $M_S$ of new physics around 1.5 TeV, the cross section can be as large as 0.11 pb (1.5pb) for monochromatic photon collision, $\gamma \gamma \to HH$, with the collider energy $\sqrt{s} = 0.5 (1)$ TeV for Higgs mass of 100 (350) GeV. The cross section can be 3 fb (2.7 fb) for the same parameters for collisions using photon beams from electron or positron back scattered by laser. These cross sections are much larger than those predicted in the Standard Model. Higgs pair production at photon colliders can provide useful tests for new physics due to extra dimensions.