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run number1360 1380 1400 1420 1440 1460 1480 1500 15200.9
0.92
0.94
0.96
0.98
1
1.02
1.04
1.06
1.08
1.1
Graph
run number1360 1380 1400 1420 1440 1460 1480 1500 15200.9
0.92
0.94
0.96
0.98
1
1.02
1.04
1.06
1.08
1.1
Graph
Livechargeweightedepyieldfromallthe2GeVemptytargetruns
• Scatteringanglefrom0.7to0.9deg,backgrounddominatedbyupstreamcollimator(80%)• Noticethathereuncertaintyfromthelivechargemeasurementisconvolutedwiththebackgroundfluctuation
UsingonlyHyCal
run number1360 1380 1400 1420 1440 1460 1480 1500 15200.8
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
Graph
Livechargeweightedepyieldfromallthe2GeVemptytargetruns
• Scatteringanglefrom1.3to5.2deg,backgrounddominatedbyresidualgasandtargetcell
UsingonlyHyCal
run number1360 1380 1400 1420 1440 1460 1480 1500 15200.8
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
Graph
run number1360 1380 1400 1420 1440 1460 1480 1500 15200.8
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
Graph
Livechargeweightedee yieldfromallthe2GeVemptytargetruns
• Scatteringanglefrom0.7to2.0deg,backgrounddominatedbyresidualgasandtargetcell
UsingonlyHyCal
run number1360 1380 1400 1420 1440 1460 1480 1500 15200.8
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
Graph
0.6 0.8 1 1.2 1.4 1.6 1.8 20.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
epRatioee_s_ee1
0.8 1 1.2 1.4 1.6 1.80.998
0.999
1
1.001
1.002
1.003
1.004
1.005
1.006
1.007
Graph
Errorfromlivechargenormalizationontheratio
• Assumethereisa5%errorfromthemeasurementoflivecharge,itwillleadtoa0.5%differencefortheep/ee ratioatsmallangle
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200310×
31.7
31.8
31.9
32
32.1
32.2
TGT:PRad:Cell_Gas_T
Eventnumber
K
• FromsomeEPICSvalues,itseemsthereisarelativelyunstableperiodatthebeginningoftherun,checkthelivechargeweightedyieldsfordifferenttimeperiodofarun
Otherthingsthatcanbechecked
• Therearesomescalarcountersaroundthebeamlineduringtheexperiment,wecancheckthereadout(recordedintheEPCIS),whichmeanindicatessomethingaboutthebackgroundlevel
scaler_cS3bscaler_cS4bscalerS8bscalerS9bscalerS10bscalerS11bscaler_cS5bscaler_cS6bscaler_cS7b
• Residualgasdistributionaroundthetargetwindow,wecanassumevariousgasdistributionsandassumethatitisnotsubtractedcleanly,seeifthataffecttheslope.
Possibleresidualgaseffect
1 2 3 4 5
1.008
1.009
1.01
1.011
1.012
1.013
Graph
Theta(deg)
• Twosimulationsamples:• SampleA:zuniformlydistributedin
targetcell,usedtogettheep/ee ratioandcomparedwithdata(afterbgsubtraction)
• SampleB:zuniformlydistributedina20cmregion,upstreamofthetargetcellwindow
• Normalizethetwosamplesbythetotalluminosity,andthenscaledownsampleBby100times
• Theplotshowstheratiooftheyields:(sampleA+scaledsampleB)/(sampleA)
ep
0.6 0.8 1 1.2 1.4 1.6 1.8 21.007
1.008
1.009
1.01
1.011
1.012
1.013
Graph
Possibleresidualgaseffect
Theta(deg)
• Twosimulationsamples:• SampleA:zuniformlydistributedin
targetcell,usedtogettheep/ee ratioandcomparedwithdata(afterbgsubtraction)
• SampleB:zuniformlydistributedina20cmregion,upstreamofthetargetcellwindow
• Normalizethetwosamplesbythetotalluminosity,andthenscaledownsampleBby100times
• Theplotshowstheratiooftheyields:(sampleA+scaledsampleB)/(sampleA)
600− 400− 200− 0 200 400 600600−
400−
200−
0
200
400
600
1
10
210
310
signal_hycal_hit_pos_ep
Testingthedensitycorrection• Thereconstructedhitpositionofacalorimeterisingeneralnotsmooth• Densitycorrectionistomakeitsmooth• Thedegreeofconcentrationdependsontheweightsweassigntothemodulesduringreconstruction• Weareusingthelogarithmicweight:W=freeparameter+log(Ei/Etotal),W=0ifW<0
• Ifthefreeparameterissmall,modulewithsmallEdep willnotparticipateinthereconstruction,sohitsnearthecenter
• Previouslythefreeparameterwas3.6 (givethebestmatchingwidth)• Currentdensitycorrectionuses4.2
Reconstructedhitposition forep,withfreeparameter3.6
600− 400− 200− 0 200 400 600600−
400−
200−
0
200
400
600
1
10
210
310
signal_hycal_hit_pos_ep
TestingthedensitycorrectionReconstructedhitposition forep,withfreeparameter
3.6
100− 50− 0 50 1000
5000
10000
15000
20000
25000
with density correction, weight = 4.2
no density correction, weight = 4.2
no density correction, weight = 3.6
signal_hycal_hit_pos_ep
(mm)
30− 20− 10− 0 10 20 300
10000
20000
30000
40000
50000
60000
70000
80000
90000with density correction, weight = 4.2
no density correction, weight = 4.2
no density correction, weight = 3.6
signal_delta_R_vs_E
30− 20− 10− 0 10 20 300
10000
20000
30000
40000
50000
60000
70000
80000 with density correction, weight = 4.2
no density correction, weight = 4.2
no density correction, weight = 3.6
signal_delta_R_vs_E
Testingthedensitycorrection• 𝝙RisthedifferencebetweenGEMmeasuredRcoordinateandHyCalmeasuredRcoordinate
• Withfreeparameteras3.6,thewidthisstillslightlysmaller
PWOpart2.2GeVeeE’~650MeV
PWOpart2.2GeVeeE’~1350MeV
Testingthedensitycorrection
E' (MeV)200 400 600 800 1000 1200 1400 1600 1800 2000 2200
(mm
)
2
2.5
3
3.5
4
4.5with density correction, weight = 4.2
no density correction, weight = 4.2
no density correction, weight = 3.6
sigma_vs_E
2.44436𝐸
+0.10971
𝐸 − 0.01763
1.473𝐸
+0.571𝐸 + 0.5722
PWOpart2.2GeVee
Testingthedensitycorrection
20− 15− 10− 5− 0 5 10 15 200
50
100
150
200
310×with density correction, weight = 4.2
no density correction, weight = 4.2
no density correction, weight = 3.6
signal_delta_R_vs_R
PWOpart2.2GeVepR~90mm
20− 15− 10− 5− 0 5 10 150
5000
10000
15000
20000
25000
with density correction, weight = 4.2
no density correction, weight = 4.2
no density correction, weight = 3.6
signal_delta_R_vs_R
PWOpart2.2GeVepR~170mm
Testingthedensitycorrection
(mm)HyCalR100 150 200 250 300 350
(mm
)
2−
1.5−
1−
0.5−
0
0.5
1
1.5
2
with density correction, weight = 4.2no density correction, weight = 4.2no density correction, weight = 3.6
• Datapointsshowthemeanvalueofthe𝝙Rdistributionforep
• Errorbaristhewidthofthedistribution
• Smallshiftfrom3.6to4.2butitiswithin100~200um
(deg)θ1 2 3 4 5 60.95
0.96
0.97
0.98
0.99
1
1.01
1.02 cutσ20
cutσ3
cutσ4
cutσ5
cutσ6
cutσ7
Graph
• Yieldsarenormalizedtothecasewith10sigmacutepyieldswithdifferentsigmamatchingcut
200− 150− 100− 50− 0 50 100 150 200
100−
50−
0
50
100
1
10
210
310
signal_hycal_hit_pos_ep
200− 150− 100− 50− 0 50 100 150100−
50−
0
50
100
1
10
210
310
signal_hycal_hit_pos_ep
• PlotsshowstheHyCalhitpositionaftereventselection(leftwith20sigmarightwith6sigma)
• Eventselection:(1)matching(2)GEMhit>0.7deg
• Yieldsarenormalizedtothecasewith10sigmacutee yieldswithdifferentsigmamatchingcut
(deg)θ0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.40.95
0.96
0.97
0.98
0.99
1
1.01
1.02 cutσ20
cutσ3
cutσ4
cutσ5
cutσ6
cutσ7
Graph
Comparisonofyields(GEMmatched)withandwithoutdensitycorrection
(deg)θ0.6 0.8 1 1.2 1.4 1.6 1.8 2
0.992
0.994
0.996
0.998
1
1.002
1.004
1.006
1.008
Graph
1 2 3 4 5
0.994
0.996
0.998
1
1.002
1.004
1.006
1.008
Graph
Theta(deg)
• Bothcaseusingfreeparameter=4.2andmatchingcut=6sigma• Densitycorrectiondoesn’thasastrongeffectontheyieldthathasGEMmatching,which
isexpected
