tariq mahmoud 04101968 - tammoun/palestine 1975-1987 schooling in palestine 1991 germany 1993 ...
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Tariq MahmoudTariq Mahmoud
04101968 - Tammoun/Palestine 04101968 - Tammoun/Palestine
1975-1987 Schooling in Palestine 1975-1987 Schooling in Palestine
1991 1991 Germany Germany
1993 1993 Physics in Mainz Physics in Mainz
2000 PhD in Heidelberg2000 PhD in Heidelberg
2005 PostDoc in Brussels 2005 PostDoc in Brussels
Physikalisches Institut:Physikalisches Institut:
The ALICE The ALICE
Transition Radiation Detector Transition Radiation Detector (TRD)(TRD)
PhD of Tariq MahmoudPhD of Tariq Mahmoud
Physikalisches InstitutPhysikalisches Institut
Universität HeidelbergUniversität Heidelberg
Properties of QCD
The strong interaction has two fundamental puzzles:
confinement and mass (mp = 938MeV, mu 5MeV, md
10MeV.)
At high temperature and/or baryon density both puzzles are resolved
phase transition
Hadrons Quark Gluon Plasma QGP
thermalization
QG
P
Mixed phaseHadron gas
PCM & clust. hadronization
NFD
NFD & hadronic TM
PCM & hadronic TM
CYM & LGT
string & hadronic TM
Heavy
Ion
Collisio
ns
The ALICE Experiment
ITSLow pt trackingVertexing
ITSLow pt trackingVertexing
TPCTracking, dE/dxTPCTracking, dE/dx
TRDElectron IDTRDElectron ID
TOFPID ( K, p, )TOFPID ( K, p, )
HMPIDPID (RICH) @ high pt
HMPIDPID (RICH) @ high pt
PHOS, 0 PHOS, 0
PMD multiplicityPMD multiplicity
MUON pairs MUON pairs
ALIC
E
Cen
tral
Barr
el
AC
B
good particle identification
large acceptance
optimize chamber parametersbuild a prototype and test it on its mechanical and electrostatic stabilitytest it in a beam on its PID capabilityare we able to access the Quarkonia in the ACB?how significant is our signal?can we resolve the individual states?
Transition Radiation (TR) -Photons are emitted if a relativistic charged particle traverses a boundary between two media with different dielectric constants (1 2)
TR | 2 - 1 |,
Lorenz factor L = (E/mc)
TR at L = 1000.
Ionization gas (Xe/CO2) ,
Particles create ion-electron pairs.
Secondary electrons drift along an electric field.
Detection at read-out pads.
A total of 1.2 Millions read-out channels.
The ALICE Transition Radiation Detector
The ALICE Transition Radiation Detector
optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stabilitytest it in a beam on its PID capabilityare we able to access the Quarkonia in the ACB?how significant is our signal?can we resolve the individual states?
Radiator
Driftvolumen
Auslese-SandwichDrähte
The ALICE Transition Radiation Detector
The ALICE Transition Radiation Detector
optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stabilitytest it in a beam on its PID capabilityare we able to access the Quarkonia in the ACB?how significant is our signal?can we resolve the individual states?
Einfluss durch Überdruck
Der Radiator wird um 400 m/mbar nach außen gewölbt.
Der Radiator wird um 5.2 m/kg nach außen gewölbt.
Einfluss der Drahtspannung
Gesamtwölbung: 900 m
The ALICE Transition Radiation Detector
The ALICE Transition Radiation Detector
optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stabilitytest it in a beam on its PID capabilityare we able to access the Quarkonia in the ACB?how significant is our signal?can we resolve the individual states?
Measured 5 cha. (CERN PS),
Extrapolated to 6 chambers
Extrapolated to high momentum
The ALICE Transition Radiation Detector
The ALICE Transition Radiation Detector
optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stabilitytest it in a beam on its PID capabilityare we able to access the Quarkonia in the ACB?how significant is our signal?can we resolve the individual states?
Extrapolated to high
momentum
optimize chamber optimize chamber parameters parameters build a prototype and test build a prototype and test it on its mechanical and it on its mechanical and electrostatic stabilityelectrostatic stabilitytest it in a beam on its test it in a beam on its PID capabilityPID capabilityare we able to access the are we able to access the Quarkonia in the ACB?Quarkonia in the ACB?how significant is our how significant is our signal?signal?can we resolve the can we resolve the individual states?individual states?
PHD
IIHE (ULB & VUB)IIHE (ULB & VUB)
Elementary Particle Physics in Elementary Particle Physics in the CMS Collaborationthe CMS Collaboration
Tariq MahmoudTariq Mahmoud
ULBULB
Extra Dimensions
Solve the hierarchy problem by space-time geometry modification Experimental signatures
- 1/r2 law deviations at small distances - Direct/indirect observation of KK particles
2 classes of models: - Large scale ED (ADD) & - Randall-Sundrum
HIER: variation of the ADD model, ED scale Rc~Tev-1
At least 2 large ED where gravity propagates 1 small ED with Rc=1/Mc~Tev-1 where gauge bosons
propagate
Appearance of Kaluza-Klein towers of states for gauge
boson fields: (n) , Z (n) (W (n),g (n) )
TeV-electrons (photons)
nice signal ;-)
Mc (TeV) Mcut (TeV)
S(100) S(20) S(1)
4.0 3.5 47.4 21.2 4.74
4.5 3.5 28.4 12.7 2.84
5.0 4.5 14.3 6.4 1.42
5.5 4.5 8.4 3.8 0.84
6.0 5.0 4.6 2.1 0.46
but
energy
corre
ctio
n(s)
and
elect
ronics
satu
ratio
n
s1s1
Electronics Saturation
saturation of the hottest cell S1
Srig
ht
Sle
ft
S up
S down
Y=Log[Sright/Sleft],
X=Log[Sup/Sdown]
f=a0+a1x2+a2y2*a3
exp(a4x2+a5y2)
Gestern lernte ich einen Buchstabe
Und ich dachte ich sei wissend,
Heute lernte ich zwei dazu
Und ich entdeckte,
Dass mir noch fünfundzwanzig fehlen.
H ألبًارحه تعلمت حرفًاHني عًالمًاZفظن\نُت,اليوم تعلمت إثنين إلى ذلكفأدركت
أنني مًا ِزnلت أجهل سُتًةH وعشرين
H ألبًارحه تعلمت حرفًاHني عًالمًاZفظن\نُت,اليوم تعلمت إثنين إلى ذلكفأدركت
أنني مًا ِزnلت أجهل ThanThanسُتًةH وعشرينXX