Evaluates $$f(x) = \frac{1}{2}(\exp(-m(T-x))\pm\exp(-m x))$$ for given mass \(m\), vector \(x\) and
time extent \(T\). This form is better usable in \(\chi^2\)
fitting than cosh or sinh.
Usage
CExp(m, Time, x, sign = 1)
Arguments
m
mass value
Time
Time extent
x
vector of values on which to evaluate the function