GENERAL OVERVIEW ---------------- Piotr Zyla, Nov. 19, 1998 _________________________________________________________________________ # name decays dst raw anal.-driver DST-unpacker _________________________________________________________________________ 2 cascade Xi,Om,etc dst raw strm5_tks3up.f updst_strm5_v4.f 3 k3pi K->3pi dst raw strm3_k3pi.f updst_str3.f 4 monitoring k_s,trig dst raw sel_monitor_event.f updst_strm5_v4.f 5 cascade Xi,Om,etc dst strm5_tks3up.f updst_strm5_v4.f 6 k3pi K->3pi dst strm3_k3pi.f updst_str3.f 7 muon with mu dst raw mu_event.f updst_mu_v4.f 8 lambda lam->p,pi dst raw find_lambda.f updst_short_v4.f 9 miss_pi Xi,Om,etc dst raw miss_lam_pi_2tk.f updst_short_v4.f _________________________________________________________________________ ------------------------------------------------------------------------- CONVENTIONS ----------- Output Events -> criterium for event to be written out for a given stream Event Type -> bit-mark in evnt_type variable (see event_type.inc) (see event_type.inc) set during stream analysis DST Content -> quantities written out to DST DST variables (in track_info.inc, unlesss spacified otherwise, with exception of streams 3 and 6) event type -> evnt_type (event_type.inc) number of tracks -> num_tracks z of bend plane -> zBndPln (bm109_info.inc) up-stream x slope -> x_slope(1,itk) up-stream y slope -> y_slope(1,itk) down-stream x slope -> x_slope(2,itk) down-stream y slope -> y_slope(2,itk) number of os tracks -> ntrk_os pointer to os tracks -> ptrk_os(ntrk_os) number of ss tracks -> ntrk_ss pointer to ss tracks -> ptrk_ss(ntrk_ss) x intercept -> xyz_intercept(1,itk) y intercept -> xyz_intercept(2,itk) z intercept -> xyz_intercept(3,itk) raw hits yes/no (1/0) indicator -> nxuvx(ich,iv,itk) value of raw hit -> xuvx(ich,iv,itk) STREAMS 2 and 5 (cascade) ------------------------- Output Events: at least 1 OS and 2 SS tracks Event Type: cascade omega Selection based on the largest probability: P(m_lam) * P(m_cas) *P(gfit chi^2, ndof) Require |m - m(PDG)| < 50 MeV DST Content: event type z of band plane number of tracks for each track (order: os,ss_lam, ss_cas for cascade type events) slopes intercepts raw hits end for each track STREAMS 3 and 6 (k3pi) ---------------------- Output Events: with event type set to k3pi Event Type: k3pi Selection based on the largest probability: P(m_K) * P(gfit chi^2, ndof) Require |m - m(PDG)| < 100 MeV DST Content: for each of best k3pi event candidate 3 tracks downstream slopes intercepts raw momenta gfit momenta number of tracks gfit vertex gfit chi^2, ndof likelihood end for each track STREAM 4 (monitoring) --------------------- Output Events: with event type set to k_0 or trigg_event Event Type: k_0 trigg_event k_0 selection: 50cm < z(vtx) < 1330cm |dx(vtx)| < 0.2 cm (~ +/-4 RMS) |dy(vtx)| < 0.4 cm (~ +/-4 RMS) |m - m(PDG)| < 17 MeV (~ +/-5 sigma) trigg_event selection: CALK Cal(K) at least 1 track in calorimeter SSWCAL SSW*Cal(Cas) at least 1 OS and 1 SS track OSWCAL OSW*Cal(Cas) at least 1 OS and 1 SS track LRW OSW*SSW L1L2 L1*L2 RF RF DELAY S45 delayed RAN Amplified PMT DST Content: event type z of band plane number of tracks for each track slopes intercepts raw hits end for each track STREAM 7 (muons) ---------------- Output Events: at least 3 OS+SS tracks and one OS or SS track with muon tag (event type: muon) Event Type: muon dimuon muon track selection: 2 out of 3 prop. tubes in both views have hits within |dx| < 4.5cm |dy| < 4.5cm dimuon: more than one muon track DST Content: bdl event type z of band plane number of tracks for each track slopes intercepts raw hits binary muon hits (prop. tubes, hodoscopes) information end for each track STREAM 8 (lambdas) ------------------ Output Events: required 1 OS and 1 SS tracks marked as lambda event type Event Type: lambda selection requires: |dx(vtx)| < 7 sigma_x |dy(vtx)| < 7 sigma_y |m - m(PDG)| < 10 sigma_m DST Content: event type z of band plane number of tracks for each track slopes intercepts end for each track STREAM 9 (missing cascade pi) ----------------------------- Output Events: required 1 OS and 1 SS tracks marked as miss_pi_lam_om event type Event Type: miss_pi_lam_om selection: lambda candidate (OS track + up_stream SS track) |dx(vtx)| < 6 sigma_x |dy(vtx)| < 6 sigma_y momentum of missing pi from mass(OS+up_SS)=m(lambda) |m(cas/omega) - m(PDG)| < 50 MeV DST Content: event type z of band plane number of tracks for each track slopes intercepts end for each track