Diapositivo 1

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Madrid, 27-28 February 2003
Test beam results
- a preliminary analysis -
Patrícia Gonçalves
patricia_at_lip.pt
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Data analysed
Radiator n(exp) Hrad(cm) New Matsu. 1.03 2
New Matsu. 1.05 2 Nov Hphil.
1.03 3 Old Matsu. 1.03 3 Nov Hphob. 1.04
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• Runs
• Protons A/Z3/2 A/Z2
• 299 ___ 293
• 302 ___ 308
• 313 312 310
• 319 320 321
• 325 326 327

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Event selection
Track (x,y) within tracker acceptance
y(tk)-y(hmax) lt 1cm
x(tk)-x(hmax) lt 1cm
Nhits /Npm(hit) (excluding pm max.) lt 9
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reconstruction
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q
reconstruction
c
Protons
Radiator n(exp) Hrad(cm) Tc(deg) n1/(ßexp
cosTc) New Matsu. 1.03 2 12.9 0.3
1.0272 0.0007 New Matsu. 1.05 2
16.8 0.3 1.0458 0.0010 Nov Hphil.
1.03 3 13.3 0.2 1.0286 0.0006
Old Matsu. 1.03 3 13.2 0.3
1.0284 0.0007 Nov Hphob. 1.04 3
16.2 0.3 1.0424 0.0015
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Velocity reconstruction
New Matsu. 1.03/2cm
New Matsu. 1.05/2cm
Nov Hphil. 1.03/3cm
Old Matsu. 1.03/3cm
Nov Hphob. 1.04/3cm
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Velocity reconstruction
Radiator vN ?ß/ß ?ß/ß New
Matsu. 1.03/2cm 2.61E-3 1.04E-3 New
Matsu. 1.05/2cm 3.56E-3 1.31E-3 Nov
Hphil. 1.03/3cm 2.39E-3
0.85E-3 Old Matsu. 1.03/3cm 3.10E-3
1.21E-3 Nov Hphob. 1.04/3cm 3.34E-3
1.15E-3
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Charge reconstruction
Nov Hphil. 1.03/3cm
New Matsu. 1.03/2cm
New Matsu. 1.05/2cm
Old Matsu. 1.03/3cm
Nov Hphob. 1.04/3cm
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Charge reconstruction efficiency
PROTONS
Radiator ltNhitsgt e
rec. New Matsu. 1.03/2cm 5.54 0.03
0.914 New Matsu. 1.05/2cm 8.07 0.05
0.987 Nov Hphil. 1.03/3cm 7.73 0.04
0.983 Old Matsu. 1.03/3cm 5.78 0.04
0.927 Nov Hphob. 1.04/3cm 7.31 0.10
0.977
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Charge reconstruction
Npe K Z2 Hrad sin2Tc erad elg
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Light guide efficiency
T? Tc
Radiator eLG New Matsu.
1.03/2cm 0.79 New Matsu. 1.05/2cm 0.77
Nov Hphil. 1.03/3cm 0.79 Old
Matsu. 1.03/3cm 0.79 Nov Hphob.
1.04/3cm 0.78
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Radiator efficiency
Radiator efficiency
Npe erad
__________________ K Z2 Hrad
sin2Tc elg
Photon non-interaction probability
Rayleigh Scattering
Lint ??4 /Cl
?? photons wavelength 377 nm Cl
clarity
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Clarity
??4 cos Tc Cl ________
log(1/erad) Hrad
Radiator e rad Clarity
(mm4/cm)() New Mats. 1.03/2cm 0.66
0.010 New
Mats. 1.05/2cm 0.60 0.012 Nov Hphil.
1.03/3cm 0.62 0.008 Old Matsu.
1.03/3cm 0.44 0.013 Nov Hphob.
1.04/3cm 0.48 0.012
()Evaluated for Z1
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Charge reconstruction
spe2 single p.e. resolution 0.5 pe npe(p)
ltnumber of p.e.sgt for protons
?Z ½ v(1spe2)/npe(p)
PROTONS
Old Matsu. 1.03/3cm
Nov Hphob. 1.04/3cm
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Charge confusion
Find P(Z) for the 3 Z values closest to Z(rec)
using ?Z exp Choose Z Pmax cc
Nevents (Z ? Zexp) /Nevents
PROTONS
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Charge reconstruction
A/Z 2 , Z2 gt He4
New Matsu. 1.05/2cm
New Matsu. 1.03/2cm
Nov Hphil. 1.03/3cm
Old Matsu. 1.03/3cm
Nov Hphob. 1.04/3cm
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Charge reconstruction
A/Z3/2 , Z2 gt He3
Nov Hphil. 1.03/3cm
Old Matsu. 1.03/3cm
Nov Hphob. 1.04/3cm
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Charge reconstruction
Radiator Protons
He3 He4 ?Z
Z cc Z
Z (exp) New Matsu. 1.03/2cm
1.04 0.22 3.4 ___ 2.07 0.27
0.26 New Matsu. 1.05/2cm 1.00 0.19 1.9
___ 2.05 0.21 0.21 Nov Hphil.
1.03/3cm 0.99 0.20 1.5 2.02 0.21 2.09
0.22 0.22 Old Matsu. 1.03/3cm 1.01 0.21
2.6 2.03 0.26 2.08 0.27 0.26 Nov Hphob.
1.04/3cm 1.00 0.22 5.5 2.05 0.24 2.19
0.24 0.20
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Summary
Z reconstruction algorithm applied to prototype
test beam data Results are compatible with the
ones presented by J.Casaus in December 02 CERN
meeting Further work e.g. include dE/dx
measurements to select Zgt 1
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