mapping long-reads to a reference library

Hi,

I have long, pacbio, reads and I have a reference library of only repeats, I want to map the long reads on the repeats library using bwa mem, is this command correct?

bwa index mmm.pacbio.fastq.gz
bwa mem mmm.pacbio.fastq.gz  repeat-library.fasta | samtools sort -@16 -  -o mm.vs.lib.sorted.bam

Do I need reference genome for mapping?