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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