see the attached pdf file

***UPDATED***

I have changed the BG subtraction procedure (no more like-sign vs. unlike-sign). New results are in the file updated_results.pdf (http://drupal.star.bnl.gov/STAR/system/files/updated_results_0.pdf)

I have also looked at the DCA_SV pT-dependency. It seems that the DCA_SV is significantly pT-dependent. Maybe we could also try to look at the ratio DCA_SV/sigma_DCA_SV (in analogy to St=DCA/sigma_DCA). Plots are in the file dcaSVpT.pdf (http://drupal.star.bnl.gov/STAR/system/files/dcaSVpT.pdf)