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// Scilab code Exa4.15 : : Page 182 (2011)
clc; clear;
p = 100; // Momentum of the particle, GeV
n = 1+1.35e-04; // Refractive index of the gas
m_0 = 1; // Mass, GeV per square coulomb
gama = sqrt((p^2+m_0^2)/m_0); // Boost parameter
bta = sqrt (1-1/gama^2); // Relativistic parameter
d_theta = 1e-003; // Error in the emission angle, radian
theta = acos(1/(n*bta)); // Emision angle of photon, radian
F_err = (p^2*n^2*2*theta*10^-3)/(2*m_0^2); // Fractional error
printf("\nThe fractional error in rest mass of the particle = %4.2f", F_err);
// Result
// The fractional error in rest mass of the particle = 0.13
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