英语翻译To do an analytical calculation of a (9),we write （公式）We

英语翻译
To do an analytical calculation of a (9),we write （公式）We see from (5.28) that the analytical calculation of a (9) involves b as a function of 9 or,more .precisely,how b changes to give scattering through an infinitesimally larger angle 9+d9.
In a scattering experiment,particles enter from the left (see Figure 5.7) with random
values of the impact parameter b and azimuthal angle ¢,and the number of particles scattered into the various detectors is measured.In our simulation,we know the value of b,and we can integrate Newton's equations of motion to find the angle at which the incident particle is scattered.Hence,in contrast to the analytical calculation,a simulation naturally yields 9 as a function of b.
9是一个希腊字母，打不出来！