As a means to increase statistics for a response matrix, I've been investigating using energetic pi+ and pi- triggers alongside energetic pi0 triggers.  In principle, the physics should be the same between all 3 species with regards to a semi-inclusive recoil jet distribution.  Here the pi+ and pi- triggers are defined to be a TPC track satisfying these requirements:

• Nfit > 15
• Nfit/Nposs > 0.52
• dca < 1 cm
• |eta| < 0.9
• pT = (9, 20) GeV/c
• |nSigPion| < 3, |nSigKaon| < 3, |nSigProton| < 3, and |nSigElectron| > 3.

At these energies, I suspect that the above cuts on dE/dx do little to distinguish the different species from one another.  The number of tracks which satisfy these requirements found in each bin of partonic pT are:

To assess whether or not the events selected by this trigger definition adequately describe the pi0-triggered data, various distributions are compared below.  Here "recoil" indicates any track or tower with delta-phi = pi +- pi/2 with respect to the trigger.

Note: the identified pi0 in the (run 9) data are clusters of 1 - 2 BEMC towers which satisfy:

• ePhi >= 0.5 GeV, eEta >= 0.5 GeV
• Pproj <= 3 GeV/c
• |eta (detector)| < 0.9
• eT = (9, 20) GeV
• TSP = (0, 0.08)

Where ePhi, eEta are the energies of the central phi, eta BSMD strips of the cluster respectively, and TSP is the transverse shower profile of the cluster.  A total of 20700 pi0 were identified in the data.

Note: the hot tower list used in both data and embedding here is attached.

Update [01.16.2018]: added track and tower eta distributions.