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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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Kyle Cranmer (BNL) DOE Review, April 17, 2007
SUSY Background Determination
7
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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
W, ZH
!
!h"
l""
W, ZH
!
!l""
l""
1
10
102
100 120 140 160 180 200
mH
(GeV/c2)
Sig
na
l si
gn
ific
an
ce
H ! " " ttH (H ! bb)
H ! ZZ(*)
! 4 l
H ! WW(*)
! l#l#
qqH ! qq WW(*)
qqH ! qq $$
Total significance
% L dt = 30 fb-1
(no K-factors)
ATLAS
Standard Model (Atlas Scientific Note)
5
10
15
20
25
30
80 100 120 140 160M
A[GeV]
tan&
LEP2: e+e'!Zh
LHC(40fb-1):
VV!H!$$ 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
Kyle Cranmer (BNL) DOE Review, April 17, 2007
Progress in Background Estimation
10
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
in
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
Kyle Cranmer (BNL) DOE Review, April 17, 2007
SUSY Studies
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Kyle Cranmer (BNL) DOE Review, April 17, 2007
Physics Analysis Tools
12
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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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
Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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Kyle Cranmer (BNL) DOE Review, April 17, 2007
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: aaponte@bnl.gov
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
Kyle Cranmer (BNL) DOE Review, April 17, 2007
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
Kyle Cranmer (BNL) DOE Review, April 17, 2007
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
Kyle Cranmer (BNL) DOE Review, April 17, 2007
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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