$ |\vec{b}| > R_{1} + R_{2} \gtrsim 2R$. Often, these particles are called quasi-real or equivalent photons, and have an energy spectrum hardly dependent on collision energy [@bauretal]. Other important aspect is the dependence of the Coulomb field on the number of charged particles into the hadron, and considering nucleus-nucleus collisions, the equivalent photon number depends on $$\begin{aligned}
n(\omega) \propto Z^{2},\end{aligned}$$ yielding an important contribution in photon interactions.

For the Higgs photoproduction, the virtuality of the photon exchanged in the peripheral proton-proton collision needs to be estimated. The source of photons in this kind of process is the Coulomb field around the protons under collision, and the photon spectrum is calculated by the Equivalent Photon Method (EPA), obtaining the Weizsäcker-Williams distribution [@bauretal; @bertu]. The photons are soft particles that have low virtuality with an upper limit determined by the hadron radius $$\begin{aligned}
Q^{2} \lesssim 1/R_{p}^{2},\end{aligned}$$ which is $Q^{2} \lesssim$ 10$^{-2}$ GeV$^{2}$ in $pp$ collisions.

The calculations were performed at partonic level, i.e., considering the photon-quark interaction. A realistic case of photon-proton interaction in Peripheral Collisions is built if one replaces the contribution of the quark-gluon vertices by a partonic distribution in the proton, as shown by the lower blob of 