how integrate this function numerically in matlab?

hi.
how integrate from the following integral over semi-elliptical path in complex ξ-plane in matlab?

please help me...
how integrate numerically from the following integral (in matlab)?

while:
epsilon = 16-1j*0.1
and
k = has a range : [0.1 , 10]

and what is the value of a?

a value is depend on k.in here:
a = 5k