تصحيح انرژي اتم هيدروژن از مرتبه 4 a براي حالت هاي برانگيخته با استفاده از نظريه ميدان موثر NRQED

Excited states energy corrections of hydrogen atom at the order of alpha^4 using NRQED as an effective field theory

In this paper, we calculate Hydrogen hyperfine splitting (HFS) at the order a4 by using NRQED as an effective field theory. We also show the leading-order contribution of nuclear size to the energy correction of Hydrogen atom.