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 m Molecule m m AtomNucleus Atomic Physics Nuclear Physics High energy means small distances Nano-Science/Chemistry m u < m QuarkBaryon Electron < m protons, 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. STANDARD MODEL  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”??

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/r 2 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.

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 and Particle Physics Fermilab/Chicago CERN/Geneva

Building Detectors at UTA

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 Construction At 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 built at UTA and installed in the Tevatron tunnel Tevatron: World’s Highest Energy Collider Fermilab DØDØ 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 Exchange now Central Exclusive Diffraction NEW

Central Exclusive Higgs Production pp  p H p : 3-10 fb beam p’ roman pots dipole E.g. V. Khoze et al M. Boonekamp et al. B. Cox et al. V. Petrov et al… Levin et al…  M = O( ) GeV Idea: M. Albrow & A. Rostovtsev forTevatron H gap -jet  p p Arnab Pal

n=1n>>1 Cerenkov Effect Use this property of prompt radiation to develop a fast timing 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 photon Pedro Duarte Shane Spivey

Fused Silica Bars 9 cm bars Some converted to mini-bars 60 psec Spread in timing as f( ) since n( )

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 Preparing for next run at CERN in October Time resolution for the full detector system: 1. Intrinsec detector time resolution 2. Jitter in PMT's 3. Electronics (AMP/CFD/TDC)

MCP-PMT 2.54 cm 9.0 cm 3.7 cm 4.7 cm 1.53 cm 2.54 cm 50º 2.57 cm 6.4 cm 1.97 cm 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) Analysis Waveform2 sample 755 events: Trigger Ch3xCh1 CH1 QBE > Ortec9306 CH2 G01 > Hamamatsu CH3 G02 > ZX60 CH4 QBD > 18dB > Phillips2

Scope Analysis  (  t)=35 ps CFD algo simulated 13 ps for Gastof 60 ps/bar for QUARTIC combining with electronics resolution gives ~20 ps track measurement, ~30 rejection factor

Baseline FP420 Detector 1 GASTOF Lots of silicon 2 QUARTICs

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. (

International Linear Collider Next Generation Accelerator (White,Yu)