This is a small C++ project with the aim of testing CERN's ROOT. It is composed of a program that generates a ROOT plot of the differential cross section of QED electron-electron interaction (Møller scattering), a .dat file with the generated data and a .tex file of the plot. The .tex plot could be compiled to a .pdf with a defined
LinuxmakeROOTLuaLaTeX
To compile the program as an executable use make with target exe.
$ make exeThe program is build in the ./bin directory. To execute it:
$ bin/mainThe program generates a .dat file in the direcotry ./data. If you want to change that see parameters. To compile (make) the make with target pdf. If you don't want an automatic clean-up use target pdf-dirty.
$ make pdfNote:
make pdfusesLuaLaTeX
The .pdf is build in ./tex/build directory.
The program has parameters that could be changed. They are defined in ./src/main.cpp. The default parameters are given:
#define N 100u // number of samples
#define P 1.0 // electron CM momentum
#define MASS 1.0 // electron invariant mass
#define COUPLING 0.30282212 // coupling constant
#define LIMIT LIMIT_RELATIVISTIC // limit of calculation
#define EXCLUSION_ARC 0.6 // arc of exclusion
#define CANVAS_W 720u // width of canvas
#define CANVAS_H 720u // height of canvas
#define CANVAS_TITLE "Moller Scattering" // title of canvas
#define GRAPH_LABEL "Differential Cross Section;" \
"\\theta\\,[rad];" \
"\\frac{d^2\\sigma}{d\\Omega^2}\\,[mb]" // graph title \ x label \ y label
#define MOLLER_DAT_PATH "./data/moller.dat" // path to `.dat` file
#define MOLLER_TEX_PATH "./tex/diagrams/moller-cross-section.tex" // path to `.tex` fileThe default value
GRAPH_LABELliteraly means "Differential Cross Section;$\theta,[\textrm{rad}]$ ;$\frac{d^2\sigma}{d\Omega^2},[\textrm{mb}]$ "
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