Tariq Mahmoud 04101968 - Tammoun/Palestine 1975-1987 Schooling in Palestine 1991  Germany

1. Tariq Mahmoud 04101968 - Tammoun/Palestine 1975-1987 Schooling in Palestine 1991  Germany 1993  Physics in Mainz 2000 PhD in Heidelberg 2005 PostDoc in Brussels

2. Physikalisches Institut: The ALICE Transition Radiation Detector (TRD) PhD of Tariq Mahmoud Physikalisches Institut Universität Heidelberg

3. 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 Hadron gas Mixed phase QGP thermalization Heavy Ion Collisions Hadrons  Quark Gluon Plasma QGP

4. The ALICE Experiment HMPID PID (RICH) @ high pt TOF PID ( K, p, p ) PMD g multiplicity TRD Electron ID ALICE Central Barrel ACB TPC Tracking, dE/dx ITS Low pt tracking Vertexing MUON m+m- pairs PHOS g,p0 good particle identification large acceptance optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stability test it in a beam on its PID capability are we able to access the Quarkonia in the ACB? how significant is our signal? can we resolve the individual states?

5. The ALICE Transition Radiation Detector Auslese-Sandwich Drähte Driftvolumen Radiator optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stability test it in a beam on its PID capability are 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.

6. The ALICE Transition Radiation Detector Einfluss durch Überdruck Einfluss der Drahtspannung Gesamtwölbung: 900 mm Der Radiator wird um 400mm/mbar nach außen gewölbt. Der Radiator wird um 5.2mm/kg nach außen gewölbt. optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stability test it in a beam on its PID capability are we able to access the Quarkonia in the ACB? how significant is our signal? can we resolve the individual states?

7. The ALICE Transition Radiation Detector Measured 5 cha. (CERN PS), Extrapolated to 6 chambers Extrapolated to high momentum optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stability test it in a beam on its PID capability are we able to access the Quarkonia in the ACB? how significant is our signal? can we resolve the individual states?

8. The ALICE Transition Radiation Detector optimize chamber parameters build a prototype and test it on its mechanical and electrostatic stability test it in a beam on its PID capability are 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 parameters build a prototype and test it on its mechanical and electrostatic stability test it in a beam on its PID capability are we able to access the Quarkonia in the ACB? how significant is our signal? can we resolve the individual states? PHD

9. IIHE (ULB & VUB) Elementary Particle Physics in the CMS Collaboration Tariq Mahmoud ULB

10. 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) )

11. TeV-electrons (photons) nice signal ;-) but energy correction(s) and electronics saturation

12. Correction function f(E,) Erec/Egen  Energy Correction Erec/Egen1

13. s1 Sleft Sdown Sright Sup s1 Electronics Saturation saturation of the hottest cell S1 Y=Log[Sright/Sleft], X=Log[Sup/Sdown] f=a0+a1x2+a2y2*a3 exp(a4x2+a5y2)

14. Electronics Saturation Saturation of the hottest cell mission possible

15. ألبارحه تعلمت حرفاً فظنَنتُني عالماً, اليوم تعلمت إثنين إلى ذلك فأدركت أنني ما زِلت أجهل ستةً وعشرين ThanX Gestern lernte ich einen Buchstabe Und ich dachte ich sei wissend, Heute lernte ich zwei dazu Und ich entdeckte, Dass mir noch fünfundzwanzig fehlen.