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

Energy Correction

Ere

c/

Egen

Erec/Egen1

Correctionfunction

f(E,)

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)

Electronics Saturation

Saturation of the hottest cell

miss

ion p

ossib

le

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