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EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder [email protected] Second Electron-Ion Collider Workshop - March 16, 2004 Jefferson Lab

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Page 1: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

EIC Monte Carlo and the Question of Jets

Joseph Seele

University of Colorado at Boulder

[email protected]

Second Electron-Ion Collider Workshop - March 16, 2004Jefferson Lab

mailto:[email protected]
Page 2: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Outline• Monte Carlo

– History of Development– Basic Structure– Current State

• Question of Jets– Events Displays of e-p from MC at

• 10 GeV on 50 GeV• 10 GeV on 150 GeV• 10 GeV on 250 GeV

– Hadronic Angular Distributions of Event Samples

Joseph Seele Second Electron-Ion Collider Workshop

Page 3: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

History of the Monte Carlo

Joseph Seele Second Electron-Ion Collider Workshop

EIC

Naomi Makins (UIUC)Antje Bruell (JLab)Joseph Seele (Colo.)

The physics monte carlo was primarily derived from the HERMES monte carlo

Page 4: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

History of the Monte Carlo

BerndSurrow(MIT)

An elementary detector simulation was built in ELECTRA, a GEANT based system

poof!

Page 5: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Structure of the Monte Carlo

Joseph Seele Second Electron-Ion Collider Workshop

The physics monte carlo consists of a framework called GMC (Generator Monte Carlo) inside which a simulation, based on eitherexternal or internal calculations, is built.

physicscalculations

GMC

data

Page 6: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Structure of theMonte Carlo

Joseph Seele Second Electron-Ion Collider Workshop

There are three current simulations based on separate packages

• disNG – (deep inelastic scattering Next Generation) This is an internalcode built originally for HERMES, but then adapted to a collidingbeam experiment setup for EIC.

• pepsi4 – (polarized electron-proton scattering interactions) A standard external package for polarized electron proton scattering.

• aroma – An external package to simulate the production of heavy quarksin electron proton scattering through boson-gluon fusion.

• (insert your generator here)

Page 7: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Current State of Development

Joseph Seele Second Electron-Ion Collider Workshop

aroma

pepsi4

disNG

pythia6

Current Team

Next to Corral

dev. proceeding

then on

to

RAPGAP

ep scattering ho!

here I come EIC!

heavy quarks don’t stand a chance

Page 8: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Question of Jets

• The possibility of jets in EIC was explored in the MC using disNG at 3 collision energies with unpolarized species.– 10 GeV on 50 GeV– 10 GeV on 150 GeV– 10 GeV on 250 GeV

• W2 > 4.0 and Q2 > 0.5 were used in the analysis.

Joseph Seele Second Electron-Ion Collider Workshop

Page 9: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

Most events look like this one

10 GeV on 50 GeV Event Displays

Page 10: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

10 GeV on 50 GeV Event Displays

Joseph Seele Second Electron-Ion Collider Workshop

Page 11: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

10 GeV on 50 GeV Event Displays

Page 12: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

10 GeV on 50 GeV Event Displays

Page 13: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

10 GeV on 150 GeVEvent Displays

Again most events look like this one

Page 14: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

10 GeV on 150 GeVEvent Displays

Page 15: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

10 GeV on 150 GeVEvent Displays

Page 16: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

10 GeV on 150 GeVEvent Displays

Page 17: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

10 GeV on 250 GeVEvent Displays

Joseph Seele Second Electron-Ion Collider Workshop

Again most events look like this one

Page 18: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

10 GeV on 250 GeVEvent Displays

Joseph Seele Second Electron-Ion Collider Workshop

Page 19: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

10 GeV on 250 GeVEvent Displays

Joseph Seele Second Electron-Ion Collider Workshop

Page 20: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

10 GeV on 250 GeVEvent Displays

Joseph Seele Second Electron-Ion Collider Workshop

Page 21: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Theta DistributionsDefinition of Theta

z

x

y

incidentelectron

incidentproton

(beam) (target)

scatteredelectron

Essentially is the angle that the hadrons’ momentum vectors make withthe momentum vector of the incident electron.

Second Electron-Ion Collider WorkshopJoseph Seele

hadrons

Page 22: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Theta Distribution at10 GeV on 50 GeV

Joseph Seele Second Electron-Ion Collider Workshop

<>=2.643RMS=.7623

The red lines indicatea 3o acceptance on

either side of the detector

Page 23: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

<>=2.751RMS=.6971

Theta Distribution at10 GeV on 150 GeV

The red lines indicatea 3o acceptance on

either side of the detector

Page 24: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Joseph Seele Second Electron-Ion Collider Workshop

<>=2.801RMS=.6520

Theta Distribution at10 GeV on 250 GeV

The red lines indicatea 3o acceptance on

either side of the detector

Page 25: EIC Monte Carlo and the Question of Jets Joseph Seele University of Colorado at Boulder seele@down.colorado.edu Second Electron-Ion Collider Workshop -

Conclusions

• Monte Carlo– Development is proceeding with Pythia6.– Development then to shift to RAPGAP.– The MC and all its documentation can be found at

http://www.npl.uiuc.edu/~eic for anyone interested in performing simulations.

– If you are interested in helping with development please contact myself ([email protected]), Naomi Makins ([email protected]) or Antje Bruell ([email protected])

• Question of Jets– The uncertainty about whether we can speak of jets or not

depends on the definition that we wish to use for a jet.– The issue is not completely closed though. I would like to see a

more quantitative assessment (and plan on performing one).

Joseph Seele Second Electron-Ion Collider Workshop

http://www.npl.uiuc.edu/~eic
mailto:[email protected]
mailto:[email protected]
mailto:[email protected]

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