madgraph / madevent

Cargese Summer School July 2010 Tim Stelzer

MadGraph/MadEvent

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Workshop 1Renormalization / Callibration

Cargese Summer School July 2010 Tim Stelzer5

Cargese Summer School July 2010 Tim Stelzer

Goals

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Cargese Summer School July 2010 Tim Stelzer

RoadMap

• Motivation, Introduction

• Hadronic Event Generation

• Analysis and Outlook

Cargese Summer School July 2010 Tim Stelzer

A Great Time In Physics

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Cargese Summer School July 2010 Tim Stelzer

A Great Time In Physics

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Cargese Summer School July 2010 Tim Stelzer

The Challenge

1 / 1,000,000,000

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Cargese Summer School July 2010 Tim Stelzer

Cargese Summer School July 2010 Tim Stelzer

KEY

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Cargese Summer School July 2010 Tim Stelzer

Form teams of 3

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At least 1 computerAt most 2 computers

Cargese Summer School July 2010 Tim Stelzer

Discoveries at hadron colliders(adapted from MLM)

Peak (easy) Shape (medium) Rate (hard)

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Cargese Summer School July 2010 Tim Stelzer

SuperSymmetry at LHC

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Cargese Summer School July 2010 Tim Stelzer

New MC shows much harder!

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Cargese Summer School July 2010 Tim Stelzer

Discovery Path @ LHC

• Rediscover Standard Model

• Identify excess

• Identify nature of excess

• Repeat

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Cargese Summer School July 2010 Tim Stelzer

Standard Model

ud

d

Matt

erLe

pton

s

Qua

rks

Forc

e Ca

rrie

rs

e-

n

du

d

u

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2E mc=

Cargese Summer School July 2010 Tim Stelzer

(3) (2) (1)SU SU U´ ´Details

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Cargese Summer School July 2010 Tim Stelzer

Perturbation Theory

dMs

2||21

eeeTM dtHi I ||

...||21|| 2

intint eeHeeHM

0IH »

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Cargese Summer School July 2010 Tim Stelzer

Example: e+e- → +-

• Scattering cross section

• Feynman Diagrams

dMs

2||21

...|| int eeHM

( )M v e ( )iq ( )v e2

igp

n( )( ) ( )u iq un

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Cargese Summer School July 2010 Tim Stelzer

QED

Z QED

W+- QED

g QCD

h QED(m)

Feynman Rules!

qq l l

qqg

W W

qqZ llZ

qq W l Wn

ggg

W W Z

W W h qqh llh

gggg

WWWW

Partial list from SMZZh

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Cargese Summer School July 2010 Tim Stelzer

• These are basic building blocks, combine to form “allowed” diagrams– e.g. u u~ -> t t~

• Draw Feynman diagrams:– gg -> tt~ (gg -> bb~ e+ ve j j )– gg -> tt~h

• Determine “order” for each diagram

Feynman Rules!

Order is QCD2

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QCDg

QED(m)h

QEDW

QEDZ

QED

QCDg

QED(m)h

QEDW

QEDZ

QEDqq l l

qqg

W W

qqZ llZ

qq W l Wn

ggg

W W Z

W W h qqh llh

gggg

WWWW

ZZh

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Cargese Summer School July 2010 Tim Stelzer50

Cargese Summer School July 2010 Tim Stelzer

Register

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http://madgraph.hep.uiuc.edu/