I Energy resolution of a homogeneous calorimeter

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Energy resolution of a homogeneous calorimeter
Hi

I want to look at the energy resolution of a homogeneous calorimeter, in the literature I found that is given by
σ/E = a ⊕ b/√E ⊕ c/E and I found that the ⊕ means quadratic sum, what does quadratic sum mean?

Thanks
Aaron
 
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##\displaystyle a⊕b = \sqrt{a^2+b^2}##
Also known as sum in quadrature.
 

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