High Energy Physics at UTA

UTA faculty Andrew Brandt, Kaushik De, 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)

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 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)

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

International Linear Collider

Next Generation Accelerator (White,Yu)

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 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

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

• First run last summer• Preparing for new run in March

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

Baseline FP420 Detector1 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!