I'm stucked in a passage of(adsbygoogle = window.adsbygoogle || []).push({}); Particle Physics(Martin B., Shaw G.) in page 41 regarding neutrino oscillations.

Having defined [itex]E_i[/itex] and [itex]E_j[/itex] as the energies of the eigenstates [itex]\nu_i[/itex] and [itex]\nu_j[/itex], we have:

[itex]E_i - E_j = \sqrt{m^2_i - p^2} - \sqrt{m^2_j - p^2} \approx \frac{m^2_i - m^2_j}{2p}[/itex]

It can be useful to know that here natural units are used ([itex]c=1[/itex]) and that the masses of the neutrino are considered much smaller than their momenta ([itex]m << p[/itex])

Still, I can't understand where the [itex]\frac{m^2_i - m^2_j}{2p}[/itex] comes from.

Does anyone have any idea?

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# Unclear approximation in demonstration regarding neutrino oscillations

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