Download Why High Energy Physics At UTA??

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 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 !!
Tevatron: World’s Highest Energy Collider
Fermilab
DØ
One of the DØ Forward Proton Detectors built
at UTA and installed in the Tevatron tunnel
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
Proton-proton collisions at 14 TeV
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 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
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 866MHz
……
CSE farm at UTA
Ten 866MHz
……
Existing infrastructure
Planned expansion – Short Term
ATLAS farm at UTA
Remote desktop machinesPlanned extension – Longer Term
(can be anywhere in the world)
US ATLAS Data Grid Testbed
U Michigan
UC Berkeley
LBNL-NERSC
ESnet,
Mren
Boston
University
NPACI,
Abilene
Argonne
National
Laboratory
Calren Esnet,
Abilene, Nton
ESnet
University of
Oklahoma
Abilene
Indiana
University
HPSS sites
University of
Texas at
Arlington
Brookhaven
National
Laboratory
Structure of Matter
Matter
Molecule
Atom
Nucleus
Baryon
Quark
(Hadron)
u
cm
10-14m
10-9m
10-10m
Chemistry
Atomic Physics
Nuclear
Physics
10-15m
<10-19m
protons, neutrons, top, bottom,
mesons, etc.
charm, strange,
p,W,L...
up, down
Electron
(Lepton)
<10-18m
High Energy Physics
Particle Detection
Charged Particle Tracks
B
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
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/r2
• Current list of elementary
(i.e. indivisible) particles
• Antiparticles have opposite
charge, same mass
Bellows
The DZero Forward Proton Detector
Roman
Pot
Detector
S
D
D2 D1
59 57
p
p
Q2
A2
A1
33
23
Q3
Q4
Q4
P1UP P OUT
2
Q3 Q2
S
P1DN
0
P2IN
23
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
hadrons
FH

EM
p
K
Time
“parton jet” “particle jet” “calorimeter jet”
Jet Production
E1T  475 GeV, 1  0.69
E1T  472 GeV, 2  0.69
q
g
(, )
Fixed cone-size jets
 Add up towers

(η0 , 0 )
ETjet 
p
p
q
R  0.7
tower
E
 T
R i  0.7
Iterative algorithm
 Jet quantities:

ET , , 
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