Mass window and bining optimization
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22/01/2001 - ALE PH Week • Mass window and bining optimization • Complete results for all the energies using the qq channel • Check of the reproducibility • Fragmentation systematic in the qq channel W Mass measurement in the qq channel D. BOUMEDIENE CEA Saclay
description
W Mass measurement in the tn qq channel. D. BOUMEDIENE CEA Saclay. Mass window and bining optimization Complete results for all the energies using the tn qq channel Check of the reproducibility Fragmentation systematic in the tn qq channel. = 200 GeV. Bining SG + Bck. Mass - PowerPoint PPT Presentation
Transcript of Mass window and bining optimization
22/01/2001 - ALEPH Week
• Mass window and bining optimization
• Complete results for all the energies using the qq channel
• Check of the reproducibility
• Fragmentation systematic in the qq channel
W Mass measurement in the qq channel
W Mass measurement in the qq channel
D. BOUMEDIENE
CEA Saclay
22/01/2001 - ALEPH Week
Bining
SG + BckMass window
MW (Expected) MeV/c2
72-9055x4 + 5x2
315 3
50x4 + 5x2
316 3
70-9760x4 + 6x2
311 3
70x4 + 8x2
308 4
70x6 + 8x2
304 4
Mass window and biningoptimization
Mass window and biningoptimization
s = 200 GeV
Large mass window
More luminosity
but additional Background (ZZ)
22/01/2001 - ALEPH Week
Bining
SG + BckMass window
MW (Exp.) MeV/c2
70-97
µvqq
50x5x5 + 2x1x1 221 2
70-97
evqq234 2
50x5x3 + 2x1x1
s = 200 GeV
Possible on e,µqq ?Possible on e,µqq ?
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Results @ 196 GeVResults @ 196 GeV
22/01/2001 - ALEPH Week
Mass plot @ 196 GeVMass plot @ 196 GeV
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Results @ 200 GeVResults @ 200 GeV
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Mass plot @ 200 GeVMass plot @ 200 GeV
Fit to the data @ 192 GeVFit to the data @ 192 GeV
MW= 80.755+ 0.443- 0.421
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Results @ 202 GeVResults @ 202 GeV
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Results @ <205> GeVResults @ <205> GeV
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Mass plot @ <205> GeVMass plot @ <205> GeV
nn cut optimizatio
n
205
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Results @ <207> GeVResults @ <207> GeV
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s(GeV)
Observedresolution(MeV/c2)
Expectedresolution(MeV/c2)
Resolutionnormalized to
200 pb-1
189 208 212 1199 1
192 432 --- (165)
196 314 316 5200 2
303 304 4200 2
200275 309 4
202 2
202 434 482 9215 4
328 343 2209 1
205369 331 2
202 1
207
Stability and reproducibility checks in the qq channel
Stability and reproducibility checks in the qq channel
test cut nn
nn test
22/01/2001 - ALEPH Week
Fragmentation systematicin qq channel
Fragmentation systematicin qq channel
With the half of the MC stat.:
MW frag. = 12 ± 7 MeV/c2
22/01/2001 - ALEPH Week
