Acoplanarity dependence of the interference term
To study the c dependence of interference term we use a Fourier weighting of cos(c+d) and sin(c+d) of the Kp mass distribution. This picks out pure interference terms that vary sinusoidally as c and that do not change sign with cos qv . Given the form of the dominant term, we expect:
- cos(c+d) weighting will pick out the real part of the K* BW
- sin(c+d) weighting will pick out the imaginary part of the K* BW