High Energy Physics at UTA Andrew Brandt Kaushik
High Energy Physics at UTA Andrew Brandt, Kaushik De, Andrew White, Jae Yu, + 5 post-docs, 6 grad students, and many undergrads
What is High Energy Physics? Ø Matter/Forces at the most fundamental level. Ø Great progress! The “STANDARD MODEL” MODEL Ø BUT… many mysteries => Why so many quarks/leptons? ? => Why four forces? ? Unification? => Where does mass come from? ? => Are there higher symmetries? ? => What is the “dark matter”? ?
Why High Energy Physics At UTA? ? YOU can perform fundamental research using world’s highest energy particle accelerators: UTA’s four HEP faculty, many grad students and post-docs are part of collaborations at Fermilab, CERN, and Brookhaven, investigating the Origin of Mass (Higgs Searches), Supersymmetry, Extra-dimensions, QCD and Forward Physics. YOU can build state-of-the-art detectors: UTA’s Swift Center Detector Laboratory is a fully equipped 10, 000 sq ft construction facility; in 2004 there will be new facilities at a brand new Science Building. YOU can develop “The GRID”, the next step beyond the Internet: UTA faculty leading international efforts in this area, we have a 50 processor high performance computing farm, and a GRID test-bed. (Visit us at UTA Science Hall or http: //www-hep. uta. edu)
The DZero Experiment World’s highest energy collisions (2 Te. V) >120 Physics papers published! (includes Top quark discovery in 1995) Now starting new 5 -year run => look for “Higgs Boson”, Supersymmetry and many other possible new phenomena UTA faculty has leadership roles: Andrew Brandt: Forward Proton Detector Leader Andrew White: Intercryostat Detector Leader Jae Yu: Remote Analysis/GRID computing coordinator Many opportunities for good Ph. D. theses !!
Tevatron: World’s Highest Energy Collider Fermilab One of the DØ Forward Proton Detectors built at UTA and installed in the Tevatron tunnel DØ
Search for the Higgs: the Origin of Mass? For MH< 135, H bb decay mode dominates – FNAL Tevatron: • Discovery? H bb MH<135 Ge. V • Maybe H WW/ZZ MH>135 Ge. V – CERN LHC: look for H WW or ZZ • Depending on what is found at FNAL Run II
Supersymmetry (SUSY) • Supersymmetry (SUSY) is an elegant extension of the Standard Model (SM) • Solves the Higgs mass fine tuning problem by introducing super-partners • Allows Grand Unification of low energy gauge couplings • Provides candidate for cold dark matter
The CERN Large Hadron Collider Proton-proton collisions at 14 Te. V The ATLAS detector is currently being built at UTA and at 100's of other institutions all over the world Location of LHC in France and Switzerland, with lake Geneva and the Alps in the background
Building Calorimeter Modules at UTA • • Project led by Kaushik De Built 130 modules at UTA Several year project Many students involved
UTA HEP Computing Resources • • Largest offsite computing facility for Run I Current UTA system: § 24 dual 866 MHz processor Linux PC’s § 0. 5 GB RAM per machine § 0. 61 TB total disk storage • • • UTA developed MC job control & monitoring software To date over 3. 3 million events generated in 6 Mo. for Run II Second farm of five dual 866 MHz Linux cpu in CSE recently added Promotes inter-departmental collaboration • UTA CSE interested in GRID development • • Human resources: Four faculty members • Two Research scientists • 1 Computing professional consultant (20 hr/week) • 3 FTE CSE undergraduate and graduate students •
High Energy Physics Training + Jobs EXPERIENCE: 1) Problem solving 2) Data analysis 3) Detector construction 4) State-of-the-art high speed electronics 5) Computing (C++, Python, Linux, etc. ) 6) Presentation 7) Travel JOBS: 1) Post-docs/faculty positions 2) High-tech industry 3) Computer programming and development 4) Financial
UTA PC FARM HEP farm at UTA 24 dual 866 MHz …… CSE farm at UTA Ten 866 MHz …… Existing infrastructure Planned expansion – Short Term ATLAS farm at UTA Remote desktop machines. Planned extension – Longer Term (can be anywhere in the world)
US ATLAS Data Grid Testbed U Michigan UC Berkeley LBNL-NERSC Calren Esnet, Abilene, Nton ESnet, Mren NPACI, Abilene Argonne National Laboratory ESnet University of Oklahoma Abilene Indiana University HPSS sites Boston University of Texas at Arlington Brookhaven National Laboratory
Structure of Matter Molecule Atom Nucleus Baryon Quark (Hadron) u cm 10 -14 m 10 -9 m 10 -10 m Chemistry Atomic Physics Nuclear Physics 10 -15 m <10 -19 m protons, neutrons, top, bottom, charm, strange, mesons, etc. up, down p, W, L. . . Electron (Lepton) <10 -18 m High Energy Physics
Particle Detection Charged Particle Tracks ÄB Calorimeter (dense) EM Absorber Material Interaction Point Scintillating Fiber Silicon Tracking Muon Tracks Energy hadronic electron photon Wire Chambers jet muon neutrino -- or any non-interacting particle missing transverse momentum We know x, y starting momenta is zero, but along the z axis it is not, so many of our measurements are in the xy plane, or transverse
The Standard Model has been very successful but has too many parameters, does not explain origin of mass. Continue to probe and attempt to extend model. • the strong force is different! • new property, color charge • confinement - not usual 1/r 2 • Current list of elementary (i. e. indivisible) particles • Antiparticles have opposite charge, same mass
Bellows The DZero Forward Proton Detector Roman Pot D 2 D 1 59 57 D A 2 33 p p Detector S A 1 23 Q 2 Q 3 Q 4 0 Q 3 Q 2 P 1 UP P OUT 2 P 1 DN 23 S P 2 IN 33 Z(m) Series of 18 Roman Pots forms 9 independent momentum spectrometers allowing measurement of proton and anti-proton momentum and angle. FPD Scintillating Fiber Detector
Highest ET dijet event at DØ CH FH EM hadrons Time “parton jet” “particle jet” “calorimeter jet” Jet Production Fixed cone-size jets l Add up towers l Iterative algorithm l Jet quantities: l
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