Spin PWG

This is a feed of Drupal items targeting the "Spin" Audience.

Verify that the fast simulator sees all of the energy deposited in geant

Verififcation that the EEMC fast simulator sees the correct energy deposit registered by geant.

Energy dependence of the sampling fraction in the EEMC

Abstract:  Single electrons are thrown at the EEMC for energies ranging from ~1 to ~100 GeV at normal incidence, at at an angle of incidence corresponding to η=1.8.  The sampling fraction is computed in each energy bin as the ratio of the energy deposited in the endcap plastic scintillator divided by the incident energy of the electron. Between 5 and 20 GeV, the sampling fraction is 4.09%, varying by 1% of its mean value across this energy range.  This is consistent with various recollections of the test beam data.  Beyond this range, the sampling fraction varies ~smoothly within ~6% of this value.

30 GeV photon pion0 energy deposit in FMS and FHC study

    I study 30 GeV photon and pion0 energy deposit in FMS and FHC. The number of event is 2k.

30 GeV Energy particle energy deposit in FMS and FHC compare

  I studied the 30 GeV n, p, pion0, pion+ and pion- energy deposit in FMS and FHC. The particles are shot from (0,0,0) to (100,0,850).

Lambda decay vertex recreating through proton pion-

         I looked at the Lambda decay into proton and pion- channel using FHC and FMS, and try to recreate the Lambda decay v

Polarizations for each fill

Energy deposition in EEMC for an e- induced shower vs incident energy at eta=1.45

Abstract:  Electrons are thrown at the EEMC at eta=1.85.  The GEANT hit information is accessed event-by-event from within GEANT.  We plot the energy registered as a HIT vs the incident e- energy.  No significant nonlinearities are observed.  A sampling fraction of 4.17% is seen.

Comparison of muon energy deposit in 1st layers of EEMC and BEMC in gstar, take 2

Abstract: Muons are thrown with energies of 1, 3, 10, 30 and 100 GeV at eta = 0.025 and eta = 1.85.  The energy-loss distributions for muons in preshower-1 and the first lead radiator in the EEMC are compared energy-loss distributions in the barrel (1st lead and 2nd scintillator layers).  We also make comparisons between the mean of the distributions and the expected values based on data tables in the particle data book.  The observed means are within 5-10% of the expected values.

FHC and FMS energy deposit practise

      I am following Qinghua's geometry and kumac files to see the energy deposit in FMS and FHC with energy 30 GeV.

Recent simulation studies in the EEMC and BEMC

Summary of recent simulation tests in the EEMC and BEMC

List of small, almost trivial, problems with the Monte Carlo

1. Density of polystyrene is 1.032 g/cm^3.  PDB quotes 1.06.

    ===> bicron has density of 1.032 g/cm^3... so that's where it comes from.

Comparison of muon energy deposit in 1st layers of EEMC and BEMC in gstar

Abstract:  Muons are thrown with energy of 100 GeV at eta = 0.025 and eta = 1.85.  Energy-loss distributions in the first layer of plastic and the first layer of lead are compared betwe

Data / MC comparisons for isolation cut, take 2

Abstract:  We apply an energy-dependent correction to the MC energy deposit in the Monte Carlo, in order to "fix" the sampling fraction problem.  Data / MC comparisons are made.

Data / MC comparisons for isolation cut

Abstract: An isolation cut for the endcap is formed by taking the ratio of the transverse energy recorded by a single tower, correcting it for expected shower leakage, and dividing it by the sum of the energy of towers w/in R<0.3 of the candidate photon.  Data and MC are compared.

Potential for use of kmeans-clustering for pi0/gamma discrimination

Abstract: k-means clustering is used to find two smd clusters (no more, no less) in each plane associated with a gamma candidate.  The invariant mass of these clusters is reconstructed for gamma candidates above ET=4.5 GeV. 

Gain studies day 72

I have been trying to optimize the range to fit the gains for the ZDC SMD slats.  I have done two ranges of gain fits and then have set the all parameters for the fit to 1 as well.  The p

2009.06.22 CIPANP 2009 photon-jet proceedings

CIPANP 2009 proceedings on photon-jet study

Title:
"Photon-jet coincidence measurements
in polarized pp collisions at sqrt{s}=200 GeV

CNI P-Carbon Polarimeters 500GeV polarization profile rough show

    CNI P-Carbon Polarimeters 500GeV Polarization Profile

Run10-11BURspindrafts

Use this page to hold drafts for Run 10-11 BUR written during May of 2009

CNI P-Carbon 500GeV polarization profile simple test

      As Carbon targets in PC polarimeters are very thin, so they can be used to measure the beam po