sddm - Code for the self-destructing dark matter search in SNO

Age	Commit message (Collapse)	Author
2018-09-06	compute theta0 in path_init() to speed things up	tlatorre

2018-09-06	update theta0 calculation	tlatorre
	This commit updates path_eval() to calculate theta0 using the residual scattering RMS for a truncated KL expansion. Since there isn't a nice closed form solution for this, we instead compute a rough approximation by evaluating the residual scattering RMS at the center of the track.
2018-09-06	introduce a minimum value for the scattering RMS theta0	tlatorre

2018-09-04	update fit to guess energy, direction, and t0	tlatorre
	This commit updates the initial guess for the energy using a simple heuristic of ~6 hits/MeV. I also updated the initial phase where we do a bunch of "quick" minimizations to loop over a series of starting positions and automatically calculate the approximate direction and t0 for the event.
2018-08-31	use interp1d() to interpolate path to speed things up	tlatorre

2018-08-31	rotate and translate the path in path_init to speed things up	tlatorre

2018-08-28	add path to the likelihood fit	tlatorre
	This commit updates the likelihood fit to use the KL path expansion. Currently, I'm just using one coefficient for the path in both x and y.
2018-08-27	add code to expand the track of a particle using a KL expansion	tlatorre
	To fit the path of muons and electrons I use the Karhunen-Loeve expansion of a random 2D walk in the polar angle in x and y. This allows you to decompose the path into a sum over sine functions whose coefficients become random variables. The nice thing about fitting the path in this way is that you can capture most of the variation in the path using a small number of variables by only summing over the first N terms in the expansion and it is easy to calculate the probability of the coefficients since they are all uncorrelated.