J. Hewett, July 2014

SLAC Particle Theory Overview

Faculty & Staff:

Stan Brodsky Shamit Kachru

Lance Dixon Michael Peskin

JoAnne Hewett Thomas Rizzo

Stefan Höche Eva Silverstein

Professor

ProfessorProfessor

Professor

Professor – ½ campus

Senior Staff

Associate Staff

Professor – ½ campus

Group Members

Research Associates FY14:

Joshua Berger James Sully

Tim Cohen (Oregon via IAS) Devin Walker

Matthew Dolan (Melbourne) Hua-Xing Zhu

Ye Li

BSM, Flavor,Dark Matter Models

BSM, Collider Physics,Dark Matter Models

BSM, Collider Physics,Dark Matter Models

BSM, Collider Physics,Dark Matter Models

QCD, Collider Physics

QCD, Collider Physics

BlackHole Information Problem

Group Members

FY11 Graduate Students: Where are They Now?Daniele AlvesNing BaoSiavosh BehbahaniKassahun BetreBoucher-VeronneauRandy CottaXi DongSarah HarrisonSonia El-HedriAnson HookBart HornAhmed IsmailEder IzaguirreMartin JankowiakAndrew LarkoskiMy Phuong LeJeff PenningtonMatthew RowleyDusan SimicHuajia Wang

WackerSilversteinWackerPeskinDixonHewettSilversteinKachruWackerWackerSilversteinHewettWackerWackerPeskinHewettDixonHewettKachruKachru

NYUCalTechBoston UnivStanford (Teaching)IndustryUC Irvine StanfordHarvardMainzIASColumbiaArgonnePerimeterHeidelbergMITTeaching local CCIndustryStill@SLACIndustryStanford

QCD (Brodsky, Dixon, Höche, Peskin)

Flavor Physics(Hewett, Rizzo)

BSM Pheno(Hewett, Rizzo)

Astro Interface(Hewett, Kachru,Rizzo, Silverstein)

Formal Theory(Dixon, Kachru, Silverstein)

Experimental Programs

Particle Theory Program: At a Glance

Higgs Physics(Dixon, Hewett, Peskin, Rizzo)

Public View of SLAC Theory

Lance Dixon writes forScientific American

JoAnne Hewett discussesCP Violation onThrough the Wormholewith Morgan Freeman

Lance’s work featured on Big Bang Theory

The Standard Model of Particle Physics

Pointlike particles

Force Carriers

communicate between

particles

Interactions based on

symmetries

Building Blocks of Matter:

This structure is experimentally confirmed!

Where is the Higgs Boson!

The Large Hadron Collider: CERN, Geneva, Switzerland

Events at the Large Hadron Collider (LHC)

What goes on inside the LHC

Stefan Höeche

What goes on inside the LHC

Stefan Höche

This work makes interpretation ofexperiments at the LHC possible!

The Higgs Boson and the Fate of the Universe

Depending on the precisevalue of the mass of theHiggs, the universe couldbe in a “false” minimum

PotentialEnergy ofThe Higgs

Higgs Interferometry and the width of the Higgs

• Almost all Higgs measurements at LHC are of s(i H) x Br(H f) = ci2 . cf2 /GH

• Can’t disentangle Higgs couplings ci , cf from width GH

Dixon, Le 1305.3854

Higgs Measurements at the LHC and signals for new physics

Cahill-Rowley, Hewett, Rizzo, 1407.7021

Supersymmetry at the LHC

SUSY discovery could be

‘easy’ at LHC:

Multijets + missing ET

Discovering Supersymmetry at the LHC

Cahill-Rowley, Hewett, Rizzo 1407.4130

Light on Dark Matter

•Dark Matter comprises 23% of the universe

•No reason to think Dark Matter should be simpler than the visible universe likely to have many different components

•Dream: Identify one or Dark Matter components and study it in the laboratory

Energy Budget of theUniverse

The Discovery of Dark Matter

Cahill-Rowley, Hewett, Rizzo 1405.6716

Galactic Center Excess in Supersymmetry

Extraordinarily difficult to explain GCE in SUSY!!

Many scenarios don’t work:pMSSMDirac gauginosExtended gauge sector

Favored scenario: General NMSSM6 additional parameters:

GCE picks out favored region of parameter spaceMany predictions

Cahill-Rowley, Gainer, Hewett, Rizzo 1409.1573