Tariq MahmoudTariq Mahmoud04101968 - 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 Mainz2000 PhD in Heidelberg2000 PhD in Heidelberg

2005 PostDoc in Brussels 2005 PostDoc in Brussels

Physikalisches Institut:

The ALICE The ALICE Transition Radiation Detector Transition Radiation Detector

(TRD)(TRD)

PhD of Tariq MahmoudPhD of Tariq MahmoudPhysikalisches InstitutPhysikalisches InstitutUniversität 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

TPCTracking, dE/dx

TRDElectron ID

TOFPID ( K, p, )

HMPIDPID (RICH) @ high pt

PHOS, 0

PMD multiplicity

MUON pairs

ALIC

E Ce

ntra

l Ba

rrel

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

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

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

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

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)

Elementary Particle Physics in Elementary Particle Physics in the CMS Collaborationthe CMS Collaboration

Tariq MahmoudTariq MahmoudULBULB

Extra DimensionsSolve 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 4.744.5 3.5 28.4 12.7 2.845.0 4.5 14.3 6.4 1.425.5 4.5 8.4 3.8 0.846.0 5.0 4.6 2.1 0.46

but

energy

correcti

on(s)

and

electronics

saturation

Energy Correction

E rec

/E g

en

Erec/Egen1

Correctionfunction

f(E,)

s1s1

Electronics Saturation

saturation of the hottest cell S1

Sright

Sleft

S up

S down

Y=Log[Sright/Sleft],

X=Log[Sup/Sdown]

f=a0+a1x2+a2y2*a3

exp(a4x2+a5y2)

Electronics Saturation

Saturation of the hottest cell

mission

possible

Gestern lernte ich einen Buchstabe

Und ich dachte ich sei wissend,

Heute lernte ich zwei dazuUnd ich entdeckte,

Dass mir noch fünfundzwanzig fehlen.

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