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?
Matter/Forces at the most fundamental level.
Great progress! The “STANDARD MODELSTANDARD MODEL”
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 TeV) >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 !!
One of the DØ Forward Proton Detectors builtat UTA and installed in the Tevatron tunnel
Tevatron: World’s Highest Energy ColliderFermilab
DØ
Search for the Higgs: the Origin of Mass? For MH< 135, H bb decay mode dominates
– FNAL Tevatron: • Discovery? H bb MH<135 GeV
• Maybe H WW/ZZ MH>135 GeV
– 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
Location of LHC in France and Switzerland, with lake Geneva and the Alps in the background
The ATLAS detector is currently being built at UTA and at 100's of other institutions all over the world
Proton-proton collisions at 14 TeV
Building Calorimeter Modules at UTA
• Project led by Kaushik De• Built 130 modules at UTA• Several year project• Many students involved
• Largest offsite computing facility for Run I• Current UTA system:
24 dual 866MHz processor Linux PC’s 0.5GB 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 866MHz 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 (20hr/week)• 3 FTE CSE undergraduate and graduate students
UTA HEP Computing Resources
High Energy Physics Training + Jobs
EXPERIENCE:1) Problem solving 2) Data analysis3) Detector construction4) State-of-the-art high speed electronics 5) Computing (C++, Python, Linux, etc.)6) Presentation 7) Travel
JOBS:1) Post-docs/faculty positions2) High-tech industry3) Computer programming and development4) Financial
HEP farm at UTA CSE farm at UTA
ATLAS farm at UTA
Remote desktop machines
Existing infrastructure
Planned expansion – Short Term
Planned extension – Longer Term(can be anywhere in the world)
24 dual 866MHzTen 866MHz
…………
UTA PC FARM
US ATLAS Data Grid Testbed
Calren Esnet, Abilene, Nton
Abilene
ESnet, Mren
UC BerkeleyLBNL-NERSC
ESnet
NPACI, Abilene
BrookhavenNationalLaboratory
Indiana University
Boston University
ArgonneNationalLaboratory
HPSS sites
U Michigan
University ofTexas atArlington
University of Oklahoma
Structure of Matter
cm 10-10m 10-14m 10-15m
u
<10-18m
10-9m
Matter Molecule Atom Nucleus QuarkBaryon
Electron
<10-19mprotons, neutrons,
mesons, etc.
top, bottom,charm, strange,
up, down
Chemistry
Atomic Physics
NuclearPhysics
High Energy Physics
(Hadron)
(Lepton)
Particle Detection
EM hadronicB
InteractionPoint
Scintillating FiberSilicon Tracking Calorimeter (dense)
Wire Chambers
Abs
orbe
r M
ater
ial
electron
photon
jet
muon
neutrino -- or any non-interacting particle missing transverse momentum
Charged Particle Tracks Energy Muon Tracks
We know x,y starting momenta is zero, butalong the z axis it is not, so many of our measurements are in the xy plane, or transverse
The Standard Model
• Current list of elementary (i.e. indivisible) particles
• Antiparticles have opposite charge, same mass
• the strong force is different!• new property, color charge• confinement - not usual 1/r2
Standard Model has been very successfulbut has too many parameters, does notexplain origin of mass. Continue to probeand attempt to extend model.
Series of 18 Roman Pots forms 9 independentmomentum spectrometers allowing measurementof proton and anti-proton momentum and angle.
Q4D SQ3S
A1A2
P1UPp p
Z(m)
D1
Detector
Bel
low
s
Roman Pot
233359 3323057
P2OUT
Q2P1DN P2IND2
Q4 Q3 Q2
FPD Scintillating Fiber Detector
The DZero Forward Proton Detector
qT
ime
p p
q g
K
“par
ton
jet”
“par
ticle
jet”
“cal
orim
eter
jet”
hadrons
CH
FH
EM
Highest ET dijet event at DØHighest ET dijet event at DØ
0.69 GeV, 472E
0.69 GeV, 475E21
T
11T
0.7R
),(η 00 ),( Fixed cone-size
jetsAdd up towers
Iterative algorithm
Jet quantities:
Fixed cone-size jets
Add up towers
Iterative algorithm
Jet quantities:
0.7R
towerT
jetT
i
EE
0.7R
towerT
jetT
i
EE
,,ET ,,ET
Jet Production
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