Mitigating the Impact of the DESI Fiber Assignment on Galaxy Clustering
  We present a simple strategy to mitigate the impact of an incomplete
spectroscopic redshift galaxy sample as a result of fiber assignment and survey
tiling. The method has been designed for the Dark Energy Spectroscopic
Instrument (DESI) galaxy survey but may have applications beyond this. We
propose a modification to the usual correlation function that nulls the almost
purely angular modes affected by survey incompleteness due to fiber assignment.
Predictions of this modified statistic can be calculated given a model of the
two point correlation function. The new statistic can be computed with a slight
modification to the data catalogues input to the standard correlation function
code and does not incur any additional computational time. Finally we show that
the spherically averaged baryon acoustic oscillation signal is not biased by
the new statistic.
