FSU Experimental HEP Faculty Todd Adams Susan Blessing Harvey Goldman S Sharon Hagopian Vasken Hagopian Kurtis Johnson Harrison Prosper Horst Wahl

What is High Energy Physics?  High Energy Physics is the study of the most basic particles and forces of nature  We explore the smallest scales and the highest energies  We want to know what really makes the Universe tick  Also known as HEP or as particle physics

What have we done before?  Discovered lots of new particles  quarks, neutrinos, taus, Z bosons, …  Determined what protons and neutrons are made of  Combined two "fundamental" forces of nature:  electromagnetism  the weak force  Created a model which explains MOST of what we have observed...

The Standard Model The Standard Model is our best knowledge of everything. It consists of all known particles and forces (except gravity). By comparing experimental results with predictions from the Standard Model, we test our understanding of the universe The Standard Model has worked remarkably well for more than 20 years

What are the Big Questions to be Answered? What is the origin of mass? Can all of the forces be unified? How do neutrinos oscillate? Why do we see more matter than anti-matter? What is out there that we have never observed? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

FSU High Energy Physics Program " We currently work on two major experiments: D0 at Fermilab CMS at CERN

Fermilab  Tevatron  Currently, the world's premier accelerator facility  Proton-Anti-Proton collisions at a center of mass energy of 1.9 trillion electron-volts  Two collider experiments  D0 and CDF  Other physics  neutrino physics, CP-violation, astrophysics and more  Located outside of Chicago  Scientists from all around the world come to Fermilab to do high energy physics

The D0 Experiment  Started taking data Spring, 2001  Will take data until 2007  There will be an upgrade in 2005  We will end up with a petabyte of data  Collider experiment which is built around the collision point to detect particles flying out in all directions

Latest results from  pp Collisions at DØ Detector in Collision Hall January 2001

D0 Data Taking 24 hours/day 7 days/week for the next 5+ years currently recording a few million events/day

FSU People at D0

Latest results from  pp Collisions at DØ Jet Events • Calorimeter Level 1 trigger – Run event V. Zutshi Brookhaven

Physics of D0  Higgs Boson  needed to resolve electroweak symmetry breaking and responsible for creating mass. Not yet discovered, but there are many indications that D0 and CDF can find it.  Supersymmetry  theory which predicts each known particle has a partner, none of which have ever been seen.  Top Quark  discovered at D0 and CDF. Now we will explore its properties.  QCD - Quantum ChromoDynamics.  D0 can explore how well it describes proton-anti-proton collisions and study what makes up the proton.  Other new particle searches  Technicolor, Leptoquarks, etc.

CERN

The CMS Experiment  Large Hadron Collider (LHC)  at CERN  Proton-proton collisions at 14 trillion electron-volts  two primary experiments – CMS and Atlas  begins operation in 2007  Compact Muon Spectrometer (CMS)  Vasken Hagopian is co-leader of the US-CMS effort  Florida State is involved in the hadronic calorimeter which is being tested and constructed at FSU, Fermilab and CERN

CMS Detector

HCAL Under Construction CERN testbeam 2002 Construction and testing at FNAL

What do we do?  Hardware  Design, develop, test, and build electronics and detectors  Data-taking (shifts)  Software  Code writing and analysis algorithm development  Data analysis  discovery, measurements, tests  Presentations at meetings, seminars and conferences  Journal publications

What will you do?  First 2-3 years  Finish coursework  Spend summers at Fermilab learning the experiment  Next several years  Some hardware project (STT, silicon, ???)  Data taking  Programming (C++, UNIX, scripting, graphics)  Data analysis on your thesis topic  Final year  Presentation and publication of thesis work  Thesis defense  You will spend significant time at Fermilab

Possible Thesis Topics Search for/Discover the Higgs Boson Search for new particles such as Supersymmetry, Technicolor, Leptoquarks, Cold Dark Matter, Extra Dimensions etc. Top Quark Physics QCD Studies including measuring the contents of the proton W mass measurements