bnl’s role in atlas · pdf filebnl’s role in atlas physics 1. kyle cranmer (bnl)...

Kyle Cranmer (BNL) DOE Review, April 17, 2007

BNL’s role in ATLAS physics

1


Overview

This talk will review BNL’s involvement in Atlas Physics

Physics topics and highlights from ongoing analyses

BNLs growing role within the ATLAS High Level Trigger

New activities within the lab

BNL’s role in Analysis Support‣ The Analysis Support Center‣ Analysis Jamborees‣ Our role in the Analysis Forums

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BNLs Leading Role in ATLAS Physics

Invited plenary talks at international conferences‣ Kyle Cranmer, “Impact of Early Higgs Discovery on ILC”, LHC/ILC Interplay,

Fermilab, 2007‣ George Redlinger, “Physics Beyond the Standard Model with ATLAS”, La

Thuile, 2007‣ David Lissauer, “Status and Plans of the ATLAS”, Jacksonville APS 2007‣ Kyle Cranmer, “The ATLAS Analysis Model”, at HCP, 2007‣ Kyle Cranmer, “Statistical Challenges of LHC Physics”, PhyStat 2007‣ Ketevi Assamagan, “Discovery Prospects of the LHC”, Dallas APS, 2006‣ Arthur Moraes, “SUSY at the LHC”, LISHEP 2006

Heavy Ion Program‣ Pavel Nevski, “Heavy Ion Physics with ATLAS”, SQM 2006‣ Peter Steinberg, “The ATLAS Heavy Ion Program”, QM 2006‣ Helio Takai, “Quarkonium Physics with ATLAS Heavy Ions”, HQWS 2006‣ Helio Takai, “Hard Probe capabilities of ATLAS”, Hard Probes 2006

In addition, numerous talks in ATLAS overview and Trigger & Physics weeks

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CSC Notes

ATLAS is in the process of a Computing System Commissioning (CSC), which will produce a broad range of “CSC Notes”‣ they are aimed at assessing our sensitivity to early physics and exercising our current reconstruction and analysis software

BNL editors of CSC notes‣ Arthur Moraes: Jets and Minimum Bias‣ Denis Damazio: Electron/Photon Reconstruction in the High Level Trigger ‣ Scott Snyder: EM Cluster Corrections‣ Kyle Cranmer: Vector Boson Fusion Higgs to Tau Tau‣ Frank Paige: Inclusive SUSY Searches‣ Hong Ma & Srini Rajagopalan: overseeing calorimeter performance notes

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Contributions to CSC notes

In addition to the CSC Note editors, BNL is actively involved in several other CSC Notes:

Tau Performance‣ Abid Patwa, Adam Cunha, Kyle Cranmer

Muon Performance‣ David Adams

ttbar backgrounds to inclusive searches & QCD backgrounds to inclusive searches‣ George Redlinger

VBF Higgs to Tau Tau‣ Abid Patwa, Adam Cunha, Fabien Tarrade, Kyle Cranmer

W/Z+Jets ‣ Kyle Cranmer & George Redlinger

Single Top Production‣ Ketevi Assamagan

Charged Higgs Searches‣ Ketevi Assamagan

Di-Bosons‣ Hong Ma

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Physics Highlights

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SUSY Background Determination

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Data-driven methods are an over-arching theme

Kyle Cranmer (BNL) DOE Review, April 17, 2007 8

The VBF H ! !! channel and Why It’s Important

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Total significance

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ATLAS

Standard Model (Atlas Scientific Note)

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VV!H!$$ VV!h!$$

Plehn, Rainwater, Zeppenfeld hep-ph/9911385Most powerful channel near LEP limit and very important for MSSM.

September 26, 2006

University of Rochester Seminar

Higgs Searches at the LHC:

Challenges, Prospects, and Developments (page 27)

Kyle Cranmer

Brookhaven National Laboratory

Vector Boson Fusion H→ττ

Kyle Cranmer (BNL) DOE Review, April 17, 2007 9

Kyle Cranmer is the co-editor of the CSC note on the subject‣ The note has 42 contributors from 13 institutions

BNL has taken an active role in this channel‣ Fabien Tarrade just joined BNL as a postdoc

● he worked on this analysis for his thesis‣ Abid Patwa just joined BNL’s Atlas efforts

● he brings expertise from Z→ττ measurements at D-Zero‣ Adam Cunha’s contributions are also being included in the CSC note on tau performance● presenting work at tau performance meeting in Poland

‣ Kyle Cranmer has been active in the note for several years● developing new techniques for mass measurement

Vector Boson Fusion H→ττ


Progress in Background Estimation

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We are developing a comprehensive strategy for estimating our backgrounds‣ Dominant background estimated from ‣ Same-Sign sample sensitive to QCD+(W+jets)+ttbar

● independent methods for QCD & W+jets individually● Need to understand relative contribution of ttbar background with real & fake tau

‣ Over-constraining the system allows us to study systematics

SS sample

QCDW+jets

even

ts/b

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Mττ (GeV)

ttbar

Atlfast – Analysis

Zjj(QCD) is main background due to high cross section

H!"!!+!" "!l+l" + 4#

Z "!!+!" "!l+l" + 4#

Can we get a estimation of the background shape by using real data?

(Iris Rottländer)

OS sample

Z→ττ

H→ττ

QCDW+jets

even

ts/b

in

ttbar

Mττ (GeV)

Z ! !! Z ! ee/µµ


SUSY Studies

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Physics Analysis Tools

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Statistical Tools

ATLAS held its first Statistics Workshop this January:‣ review current practices and challenges

● combinations, systematics, blind analysis, “look elsewhere effect”‣ Kyle Cranmer presented recent developments in the treatment of

systematics and RooStats initiative

After the meeting:‣ George Redlinger addressed potential for blind analysis in SUSY

searches‣ ATLAS statistics forum was formed, Kyle appointed as an expert

There is growing support for a joint ATLAS/CMS statistics committee and the development of common tools‣ Kyle was invited to present RooStats at the Root users workshop

PhyStat 2007 organized for this summer at CERN

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Triggering at the LHC

Only about 1 in 500,000 events will be stored to diskThe Trigger is a vital part physics program

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‣ Kyle Cranmer, co-coordinator of Jet/Tau/Etmiss in the High Level Trigger

‣ George Redlinger, Active in trigger rate estimates and trigger menu studies for SUSY

‣ Abid Patwa, Joining tau effort in High Level Trigger

‣ Srini Rajagopalan, Coordinating Trigger Menus

‣ Denis Damazio, Electron & Photon trigger algorithms and low-level data access


Joint Theory/Experiment Meetings

Early this year we organized a joint theory/experiment meeting at BNL‣ an effort to catalyze the interaction between BNL’s experimental group and the theoretical expertise at BNL and Stony Brook

This has let to experimental talks at the theory lunch seminar‣ Kyle Cranmer on Higgs searches and statistical methods‣ George Redlinger on ATLAS SUSY searches

Expect to incorporate more theoretical interaction in upcoming Analysis Jamborees at BNL

The Brookhaven Forum a further example of this interaction

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Brookhaven Forum 2007

Consider the physics potential of the LHC, the ILC, and their synergy

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Brookhaven Forum 2007

May 30 - June 1, 2007 Brookhaven National LaboratoryUpton, NY USA

Organizing CommitteeKetevi Assamagan (BNL), Kyle Cranmer (BNL),

Hooman Davoudiasl (BNL, Co-Chair),

Sally Dawson (BNL), Bill Kilgore (BNL),

Frank Paige (BNL), Gilad Perez (SUNY-SB),

Leonardo Rastelli (SUNY-SB),

Amarjit Soni (BNL, Co-Chair)

Conference Coordinator: [email protected]

Registration Deadline: April 30, 2007

https://www.bnl.gov/newhorizons

Photo: Courtesy NASA/JPL-Caltech

New Horizons at Colliders

managed for the U.S. Department of Energy by Brookhaven Science Associates, a company founded by Stony Brook University and Battelle


Analysis Support

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US-ATLAS Analysis Forum Conveners‣ Kyle Cranmer: Trigger Forum Convener‣ Frank Paige: Beyond the Standard Model Convener

BNL is a US-ATLAS Analysis Support Center‣ Hong Ma: BNL Support Center Coordinator

US-ATLAS Analysis Support Group Contacts‣ Ketevi Assamagan: Physics Analysis Tools‣ Tadashi Maeno: Distributed Analysis‣ Alex Undrus: Software Support

Srini Rajagopalan: US-ATLAS L2 Software & Analysis Support Manager


Analysis Jamborees

BNL started a series of Analysis Jamborees to go beyond basic tutorials. Nearly a full week long, the emphasis is on physics and participants come with specific goals in mind‣ Trigger Aware Analysis, BSM Physics, CSC Notes‣ roughly 25 participants in each of the Jamborees

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Since the introduction of the idea, other support centers have picked up the idea‣ two at Argonne‣ two at LBNL‣ one at SLAC


Conclusion

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BNL Continues to play an active role in analysis within ATLAS

Our focus is on preparing for analysis with real data‣ commissioning, reconstruction, calibration, and trigger‣ growing effort in physics analysis & data-driven methods

Dedicated effort to leverage local theoretical resources

As an analysis support support center‣ BNL introduced concept of Analysis Jamborees‣ provide expertise for support groups & analysis forums

We eagerly anticipate data taking in 2008

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