high energy physics at u t a
DESCRIPTION
High Energy Physics at U T A. UTA faculty Andrew Brandt , Kaushik De, Amir Farbin, Andrew White, Jae Yu along with many post-docs, graduate and undergraduate students investigate the basic forces of nature through particle physics studies at the world’s highest energy accelerators. - PowerPoint PPT PresentationTRANSCRIPT
High Energy Physics at UTA
UTA faculty Andrew Brandt, Kaushik De, Amir Farbin, Andrew White, Jae Yu along with
many post-docs, graduate and undergraduate students investigate the basic forces of nature through particle physics studies at the world’s
highest energy accelerators
In the background is a photo of a sub-detector of the 5000 ton DØ detector. This sub-detector was designed and built at UTA and is currently operating at Fermi National Accelerator Laboratory near Chicago.
Structure of Matter
cm
Matter
10-9m
Molecule
10-10m 10-14m
Atom Nucleus
Atomic Physics
NuclearPhysics
High energy means small distances
Nano-Science/Chemistry10-15m
u
<10-18m
QuarkBaryon
Electron
<10-19mprotons, neutrons,
mesons, etc.
top, bottom,
charm, strange,up, down
High Energy Physics
(Hadron)
(Lepton)
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”??
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.
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
Forward Proton Detector (FPD)
• Quadrupole Spectrometers• surround the beam: up, down, in, out• use quadrupole magnets (focus beam)
- a series of momentum spectrometers that make use of accelerator magnets in conjunction with position detectors along the beam line
• Dipole Spectrometer• inside the beam ring in the horizontal plane• use dipole magnet (bends beam)
• also shown here: separators (bring beams together for collisions)
A total of 9 spectrometers comprised of 18 Roman Pots
Data taking finished, analysis in progress (Mike Strang Ph.D.)
Detector ConstructionDetector ConstructionAt the University of Texas, Arlington (UTA), scintillating and optical fibers were spliced and inserted into the detector frames.
The cartridge bottom containing the detector is installed in the Roman pot and then the cartridge top with PMT’s is attached.
One of the DØ Forward Proton Detectors builtat UTA and installed in the Tevatron tunnel
Tevatron: World’s Highest Energy ColliderFermilab
DØ
High-tech fan
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
FP420: Particle physics R&D collaboration that proposes to use double proton tagging at 420m
as a means to discover new physics
FP420 Overview
Used to be called Double Pomeron Exchangenow Central Exclusive Diffraction
NEW
Central Exclusive Higgs Production pp p H p : 3-10 fb
beam
p’
p’roman pots roman pots
dipole
dipole
22 )''( ppppM H
E.g. V. Khoze et alM. Boonekamp et al.B. Cox et al. V. Petrov et al…Levin et al…
M = O(1.0 - 2.0) GeV
Idea: M. Albrow &A. Rostovtsev forTevatron
Hgap gap
b
b -jet
-jet
p p
Arnab Pal
n=1 n>>1
Cerenkov Effect
Use this property of prompt radiation to develop a fasttiming counter
particle
Background Rejection
Ex, Two protons from one interaction and two b-jets from another
Fast Timing Detectors for ATLAS
WHO? UTA (Brandt), Alberta, Louvain, FNAL
WHY?
How? Use timing to measure vertex
How Fast? 10 picoseconds (light travels 3mm in 10 psec!)
proton
phot
on
Pedro DuarteShane Spivey
T958• Fermilab Test beam experiment to study fast timing
counters for FP420 (Brandt spokesman)
• Used prototype/preprototype detector with NIM/CAMAC discriminator/TDC to test concept
• Test beam at Fermilab Sep. 2006, Mar.+Jul. 2007
• Preparing for next run at CERN in October
Time resolution for the full detector system:1. Intrinsec detector time resolution2. Jitter in PMT's3. Electronics (AMP/CFD/TDC)
MCP-PMT
2.54 cm2.54 cm
9.0 cm
3.7 cm
4.7 cm
1.53
cm
2.54
cm
50º2.57
cm
6.4 cm
1.97cm
top view
side view
top view (photo)
QUARTIC Preprototype
beam
Initial Results
<70 psec>90% efficiency
G1-G2
For events with a few bars on see anticipated√N dependence
Scope (Tektronix DPO70404) AnalysisWaveform2 sample 755 events: Trigger Ch3xCh1CH1 QBE > Ortec9306CH2 G01 > HamamatsuCH3 G02 > ZX60CH4 QBD > 18dB > Phillips2
Scope Analysis
(t)=35 ps
CFD algo simulated
13 ps for Gastof60 ps/bar for QUARTICcombining with electronicsresolution gives ~20 pstrack measurement, ~30 rejection factor
Conclusions
Many Opportunities for state-of-art research with one of the top HEP groups in the country/world!
GOOD NEWS!
• DOE ADR awarded A.B. $75k includes money for fast scope, CAEN HPTDC, electronics, travel to CERN testbeam, etc.
• Recently funded by NSF for WMD detection using gold-coated scintillation nanoparticles
• My sabbatical was approved by UTA, I plan to be at CERN Jan-Aug 2008
Why High Energy Physics At UTA?? YOU can perform fundamental research using world’s highest
energy particle accelerators: UTA’s five HEP faculty, many grad students and post-docs are part of collaborations at Fermilab and CERN, investigating the Origin of Mass (Higgs Searches), Supersymmetry, Extra-dimensions, and QCD
YOU can build state-of-the-art detectors: The new CPB includes unparalleled facilities for detector construction
YOU can develop “The GRID”, the next step beyond the Internet: UTA faculty leading international efforts in this area, including the new Tier 2 Computing Center which makes UTA one of the top ATLAS institutions in the U.S.
(http://www-hep.uta.edu)