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HBD performance study during run9 pp 200GeV
Katsuro Nakamura
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HBD Sdphi, Sdzstability check during Run-9
• Sdphi, Sdz … distance between track and cluster, normalized with RMS
• used whole electron tracks in EWG_DST on CCJ
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electron track selection
– abs(bbcz)<20cm– quality==31||51||63– pt>0.15GeV/c– n0>=2– prob>0.01– abs(emcsdphi_e)<4, abs(emcsdz_e)<4– e/p>0.6– hbdsize>=2
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Sdphi fitting
• fit with gaus + pol1– check the run dependence of mean and sigma of gaus
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Sdphi0.0 < pt < 0.5 GeV/c 0.5 < pt < 1.0 GeV/c
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mean
sigma
mean
sigma
Sdphi1.0 < pt < 1.5 GeV/c 1.5 < pt < 2.0 GeV/c
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mean
sigma
mean
sigma
Sdz fitting
• fit with gaus + pol1– check the run dependence of mean and sigma of gaus
z
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Sdz0.0 < pt < 0.5 GeV/c 0.5 < pt < 1.0 GeV/c
displacementof mean valuerecalibrate this value(but this displacement is enough small to be ignored.)
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dynamical movingduring run-9 ?
mean
sigma
mean
sigma
Sdz after private recalibration0.0 < pt < 0.5 GeV/c 0.5 < pt < 1.0 GeV/c
new_sdz =(sdz - mean)/sigma
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mean
sigma
mean
sigma
Sdz1.0 < pt < 1.5 GeV/c 1.5 < pt < 2.0 GeV/c
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mean
sigma
mean
sigma
Sdz after private recalibration1.0 < pt < 1.5 GeV/c 1.5 < pt < 2.0 GeV/c
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mean
sigma
mean
sigma
Sdz private recalibration parametersrunnumber pt [GeV/c] mean sigma
281800 ~ 282800 0.0 < pt <= 0.5 0.1147 1.030
0.5 < pt <= 1.0 0.09853 1.019
1.0 < pt <= 1.5 0.08010 1.002
1.5 < pt 0.07061 0.9853
282800 ~ 285160 0.0 < pt <= 0.5 0.1370 1.030 (same)
0.5 < pt <= 1.0 0.1269 1.019 (same)
1.0 < pt <= 1.5 0.1135 1.002 (same)
1.5 < pt 0.1044 0.9853 (same)
285160 ~ 287100 0.0 < pt <= 0.5 0.2214 1.030 (same)
0.5 < pt <= 1.0 0.2170 1.019 (same)
1.0 < pt <= 1.5 0.1997 1.002 (same)
1.5 < pt 0.1918 0.9853 (same)
287100 ~ 291500 0.0 < pt <= 0.5 0.2486 1.030 (same)
0.5 < pt <= 1.0 0.2348 1.019 (same)
1.0 < pt <= 1.5 0.2205 1.002 (same)
1.5 < pt 0.2150 0.9853 (same)12
HBD calibration check for electron track
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electron track selection
– abs(bbcz)<20cm– quality==31||51||63– pt>0.15GeV/c– n0>=2– prob>0.01– abs(emcsdphi_e)<4, abs(emcsdz_e)<4– e/p>0.6– hbdsize>=2– abs(hbdsdphi)<4, abs(hbdsdz)<4
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electron track distribution
• electron track dist. on sect9 is almost uniform.
pad id (0-origin): 96 97 98 …………… Sect 9 South
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fill hbdcharge to the nearest pad from p = {phbdx, phbdy, phbdz}.
/////////////////////////////////int padnum = NearestPad(phbdx,phbdy,phbdz);hist[padnum]->Fill(hbdcharge);/////////////////////////////////
I found the update of HbdWisClustrizer.C on CVS
• HbdWisClustrizer.C– define clustering algorithm
• HbdWisClustrizer.C –r1.12 (previously used)– cause nonuniform cluster peak distribution• detail is in slide sent to electron-l on 5/ 6/ 2010
• update• HbdWisClustrizer.C –r1.16 (latest version)– looks fine!
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peak pad distribution after update
• reasonable distribution
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fill hbdcharge to the peak pad in the cluster
//////////////////////////int max_pad = peak pad in the cluster;hist[max_pad]->Fill(hbdcharge);//////////////////////////
pad id (0-origin): 96 97 98 …………… Sect 9 South
sector-by-sector HBD charge dist. for single e and double e
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Dalitz Electron Pair Selection• Electron Selection– bbcz < 20 cm– quality==31||51||63– pt>0.15GeV– n0>=2– abs(emcsdphi)<4.0 , abs(emcsdz)<4.0– prob>0.01– e/p>0.6– hbdsize>=2– abs(hbdsdphi)<4.0 , abs(hbdsdz)<4.0
• Pair Selection– Mass<0.15GeV/c^2 select Dalitz region– PhiV cut reject conversion pairs– Unlike sign 19
Single e and Double e definition
Single• hbd_id(trk_i) != hbd_id(trk_j)
Double• hbd_id(trk_i) == hbd_id(trk_j)
π
trk_i
trk_ jπ
trk_i
trk_ j
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notice: used HbdWisClusterizer.C –r1.12 in the following analysis
HBD charge distribution (East Arm)for Dalitz event (Raw dist.)Sect Sect
0
1
2
3
4
5
Direction N S N S
blue: singlered : double
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HBD charge distribution (West Arm)for Dalitz event (Raw dist.)Sect Sect
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7
8
9
10
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Direction S N S N
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blue: singlered : double
HBD charge distribution (East Arm)for Dalitz event (normalized)
• normalized with integral of entry
Sect Sect
0
1
2
3
4
5
Direction N S N S
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blue: singlered : double
difficultto use
slightlyworse
slightlyworse
HBD charge distribution (West Arm)for Dalitz event (normalized)
• normalized with integral of entry
Sect Sect
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7
8
9
10
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Direction S N S N
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blue: singlered : double
comparing with the distribution made by Ilia
• good agreement single double
HBD charge distributionπ
e+e-
HBD charge distributionD
e
Dalitz event Dalitz event
pair mass ~ 0field ~ 0
by I.Ravinovichi25
For the next step
• study Pt dependence of the ratio between single and double.– low pt 2 clusters tend to be separated– high pt 2 clusters tend to be merged
• decide charge threshold sector-by-sector
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backup slide
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HBD scintillation charge distribution
• fit with a0*exp(-x/a1)• a0 = const, a1 = slope 28
fit on 2.5 ~ 5 [p.e.]
run dependence of fitting slope
• it’s stable– since it’s
calibrated
• no large difference on pad-by-pad– also “const”
has no large difference
HBD sect9Yellow: pad107Red: pad127Blue: pad106Green: pad105 29
central pad in cluster
• you can see the pad dependence of yielded charge
Sect 9 Southpad id (0-origin): 96 97 98 ……………
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