D0 v1 analysis documents

Updated on Fri, 2018-06-08 10:00 by subhash. Originally created by dongx on 2018-03-21 13:38. Under:

physics

This page is designed to assemble the D0 v1 analysis details.

==> Section 1 <===
Dataset:

This analysis is based on the Au+Au collisions at \snn=200 GeV collected by the STAR experiments during the 2014 and 2016 runs. The 2014 run is processed with P16id library. The 2016 run is processed with P16ij. The analysis uses picoDst which is produced from MuDst. The details of the datasets can be found at:

http://www.star.bnl.gov/public/comp/prod/DataSummary.html

Event cuts:

A minimum-bias trigger is used. For run14, it denoted as “vpdmb-5-p-nobsmd” (450005,450015,450025) and “vpdmb-5-p-nobsmd-hlt” (450050,450060). For run16, it is denoted as “VPDMB-5-p-sst” (520001, 520011, 520021, 520031, 520041, 520051). The event selection cuts are:

1) |primary vertex in z direction| < 6 cm

2) |primary vertex in transverse direction| < 2 cm

3) |primary vertex z – vpdVz| < 3 cm
4) ! ( PV_x < e-5 & PV_y < e-5 & PV_z < e-5)

vpdVz is the vertex z position calculated from time difference measured by two sides of VPD.

After passing cuts there are 831 M events in run14 and 990 M events in run16.

Good run list:
https://drupal.star.bnl.gov/STAR/blog/rksooraj/good-run-lists-hft-embedding

RunQA:

==> Section 2 <===
D0 reconstruction
Single track cuts:

1Daughter selection

1) Global tracks

2) pT > 0.6 GeV/c

3) |eta| < 1

4) nHitsFit ≥ 20, in TPC

5) nHits/nHitsMax ≥ 0.52

6) HFT track: hasPxl1Hit() && hasPxl2Hit() && (hasIstHit() || hasSstHit())

7) fabs(geometricSignedDistance(pVtx)) > 0.005

pion PID:

isTPCPion = |nSigmaPion| < 3.0, based on TPC dE/dx

If TOF is available: |1/β − 1/βexp| < 0.03 and isTPCPion

If TOF is not available: isTPCPion

kaon PID:

isTPCKaon = |nSigmaKaon| < 2.0, based on TPC dE/dx

If TOF is available: |1/β − 1/βexp| < 0.03 and isTPCKaon

If TOF is not available: isTPCKaon

D0 topological cuts:

The geometrical cuts are same as in the D0 v2 analysis, which is from TMVA estimation. (https://drupal.star.bnl.gov/STAR/system/files/note_6.pdf). The values are: