Mattione Update 09172012

Cherenkov Detector Details

Helium Drift Chamber

p, GeV/c    sigmas

• 1 < theta < 12 deg.

  0.6245    4.2037
  0.8789    1.7938
  1.1314    0.2436
  1.6340    1.9882
  2.1354    2.5751
  3.1369    2.7551
  4.1376    3.0187
  5.1381    3.2674
  6.1384    3.1173
  7.1386    2.9361
  8.1388    3.4436

• 12< theta < 14.5 deg

  0.6245    4.0642
  0.8789    1.7085
  1.1314    0.2277
  1.6340    1.9594
  2.1354    2.5265
  3.1369    2.6784
  4.1376    2.9421
  5.1381    3.1976
  6.1384    3.0447
  7.1386    2.8590
  8.1388    3.3818

• 14.5 < theta < 18 deg

  0.6245    2.9724
  0.8789    1.2684
  1.1314    0.1723
  1.6340    1.4059
  2.1354    1.8209
  3.1369    1.9482
  4.1376    2.1345
  5.1381    2.3104
  6.1384    2.2043
  7.1386    2.0762
  8.1388    2.4350

Gas Threshold (Original Design)

• From ~1 or ~0 to 10 degrees
• No K/proton separation
• Separation between Pions & Kaons as a function of momentum.
  • Theta dependence is present but not shown (not super large).
  • NOTE: Cut NOT performed when #sigmas < 3.0!!

RICH (Yi)

• From ~1 or ~0 to 20 degrees
• K/proton separation not shown but is included in the study.
• Separation between Pions & Kaons as a function of momentum.
  • Theta dependence is present but not shown (not super large).

LHCb RICH

• BIG IMPORTANT NOTE: These studies were performed with the parameters of the LHCb RICH AS IS (at a ~$4 million cost)
• From 0 to 20 degrees
• 99.3% K/Pi separation from 0.6 to 2.6 GeV/c
• Perfect K/Pi separation above 2.6 GeV/c
• 99.3% K/proton separation from 2.0 to 10.0 GeV/c
• Perfect K/proton separation above 10.0 GeV/c

Studies

• Kaon PID Studies: Y(2175)
• Kaon PID Studies: φ3(1850)
• Kaon PID Studies: η'(2300)
• Kaon PID Studies: h2'(2600)

Summary

genr8 Background Events

•  % of reconstructed combos remaining in the signal region after performing a Vertex-P4 kinematic fit with a missing proton

Detector	Y(2175)	φ3(1850)	η'1(2300)	h'2(2600)
No CKOV	0.65%	40.45%	1.01%	1.24%
He DC	0.37%	14.28%	0.72%	0.68%
Gas Thresh.	0.59%	4.50%	0.68%	0.60%
RICH (Yi)	0.0014%	6.29%	0.32%	0.16%
LHCb RICH	0.0014%	0.61%	0.23%	0.042%

bggen Background Events

•  % of reconstructed combos remaining in the signal region after performing a Vertex-P4 kinematic fit with a missing proton

Detector	Y(2175)	φ3(1850)	η'1(2300)	h'2(2600)
No CKOV	0.0085%	1.86%	0.0053%	0.046%
He DC	0.0053%	1.17%	0.0041%	0.030%
Gas Thresh.	0.0080%	0.92%	0.0043%	0.029%
RICH (Yi)	0.0031%	0.72%	0.0029%	0.013%
LHCb RICH	0.0029%	0.44%	0.0026%	0.011%