John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007 ALICE-USA Collaboration, Physics...
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![Page 1: John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007 ALICE-USA Collaboration, Physics and Approach LHC Alice Dedicated “general purpose” Heavy.](https://reader035.fdocuments.in/reader035/viewer/2022062309/5697bfb71a28abf838c9ee0d/html5/thumbnails/1.jpg)
John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE-USA Collaboration, Physics and Approach
LHC
Alice
Dedicated “general purpose”Heavy Ion experiment at LHC
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE-USA CollaborationALICE-USA Author List (2009) - 44 (+ new) PHDs + 15 graduate students
Cal. Poly, San Luis Obispo (NSF) – J. Klay, postdocCreighton U. – M. Cherney, Y. Gorbunov, B. Rizzo (gs), J. SegerU. Houston - L. Pinsky, A. Empl, B.W. Mayes II, C. Delgenio (gs), D. Minthaka (gs),
graduate studentKent State U. – S. Margetis, D. Keane, W. Zhang, postdoc, graduate studentLBNL – P. Jacobs, S. Klein, G. Odyniec, J. Putschke, H.G. Ritter, TJM Symons, M. van LeeuwenLLNL – R. Soltz, A. Glenn, J. NewbyMichigan State U. – G. Westfall, + TBDORNL – T. Awes, P. Stankus, D. Silvermyer, G. Young, postdocPurdue U. - R.P. Scharenberg, B.K. Srivastava, and grad student(s)U. Tennessee – S. Sorensen, K. Read, postdoc, grad. studentU. Texas – C. Markert, + TBDWayne State U. – T.M. Cormier, R. Bellwied, C.A. Pruneau, S. Voloshin,
A. Pavlinov, + 2 postdocs and 3 grad. studentsYale U. – J.W. Harris, J. Bielcik, J. Bielcikova, H. Caines, M. Heinz,
S. Salur, N. Smirnov, T. Aronsson (gs), and 4 graduate students
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Heavy Ion Physics at the LHCLHC Heavy Ions –
• guided by pQCD predictions • expectations (detector simulations) based on RHIC extrapolations and theory• lesson from RHIC – guided by theory + versatility + “expect the unexpected”
Soft Physics at LHC – • smooth extrapolation from SPS RHIC LHC?• expansion will be different (v2, HBT, Tchem & Tkin,
strange/charm particles & resonances)
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Heavy Ion Physics at the LHCLHC Heavy Ions –
• guided by pQCD predictions • expectations (detector simulations) based on RHIC extrapolations and theory• lesson from RHIC – “expect the unexpected”
Soft Physics at LHC – • smooth extrapolation from SPS RHIC LHC?• expansion will be different (v2, HBT, Tchem & Tkin,
strange/charm particles & resonances)
Hard Probes at LHC – • significant increase in hard cross sections
hard /total~ 2% at SPS
50% at RHIC
98% at LHC• “real” jets, large pT processes
• abundance of heavy flavors• probe early times, calculable precision studies!
bb (LHC ) ~ 100 bb (RHIC)
cc (LHC) ~ 10 cc (RHIC)
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE Set-upHMPID
Muon Arm
TRD
PHOS
PMD
ITS
TOF
TPCSize: 16 x 26 meters
Weight: 10,000 tons
EMCal
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE Detectors & Acceptance
central barrel -0.9 < < 0.9• = 2 tracking, PID (TPC/ITS/ToF)• single arm RICH (HMPID)• single arm e.m. cal (PHOS)• jet calorimeter (proposed EMCal)
forward muon arm 2.4 < < 4• absorber, 3 T-m dipole magnet10 tracking + 4 trigger chambers
multiplicity detectors -5.4 < < 3• including photon counting in PMD
trigger & timing detectors• 6 Zero Degree Calorimeters• T0: ring of quartz window PMT's• V0: ring of scint. paddles
(charged particles)
µ arm
EMCal
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Particle Identification in ALICE
Pb-Pb
, K, p: 0.1- 0.15 50 GeV
Topological reconstruction Invariant mass
PID in relativistic rise
Pb-Pb
PID capabilities unique to ALICE!
Global tracking (ITS-TPC-TRD)
dE/dx (low pT + relativ. rise)
TOF, HMPID, PHOS
pT range (PID/stat. limits) in 109 pp or 107 central Pb-Pb
Decay particles: 10 - 15 GeV
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE EMCal (Cormier Presentation)
10+1/2+1/2=11 super-modules8 SM from US3 SM from France, Italy
Lead-scintillator sampling calorimeter = 1.4, =110o
Shashlik geometry, APD photosensor ~13K towers ( x ~ 0.014 x 0.014)
Energy resolution 15%/√E + 2%
over-takes tracking above 30 GeV
o/ discrimination to pT ~ 30 GeV
Approved by LHCC 9/28/06
Allows Jet Measurements/Triggering with ALICE
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Capabilities of ALICE Extended by EMCal
EMCal improves detector capabilities:
- Fast trigger ~10 -100 enhancement of jets
- Improves jet reconstruction (plus TPC)
- Good discrimination
increases coverage
- Good electron/hadron discrimination
EMCal extends the physics of ALICE:
104 / year in minbias Pb+Pb:
inclusive jets: ET ~ 200 GeV
dijets: ET ~ 170 GeV
: pT ~ 75 GeV
inclusive : pT ~ 45 GeV
inclusive e: pT ~ 30 GeVP.Jacobs
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Synopsis of ALICE Physics Measurements
Soft Probes – “ala RHIC” • ALICE – important soft physics measurements ala RHIC (+ extended PID)• Expansion dynamics different from RHIC (note - timescales, densities)• Day 1 physics + ….. (unexpected…)
Heavy Quarks• Displaced vertices (Do K- +) from TPC/ITS (charm and beauty)• Electrons in Transition Radiation Detector (TRD)
Quarkonia (forward muon arm)• J/, , ’ (excellent), ’’(2-3 yrs), ’ (very difficult!)
Jet Quenching & Medium Response• Leading particles to intermediate pT (range of intermediate pT at LHC?)• Away-side in TPC (with extended PID)
trigger on leading 0 trigger on / measure jets6x increased acceptance for ’s
compared to PHOS
measure e with pe > 10 GeV (where TRD…)
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE Collaboration~ 1000 Members (~ 500 M&O PhDs) 63% CERN States ~ 8% expected US
~ 30 Countries
~ 100 Institutes
~ 150 M CHF capital (+ L3 magnet)
0
200
400
600
800
1000
1200
1990 1992 1994 1996 1998 2000 2002 2004
ALICE Collaboration statistics
LoI
MoU
TP
TRD
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE-USAALICE-USA Collaboration
40 - 50 Ph.D. physicists and 15 graduate students by 2009
12 DOE-supported research institutions:
Creighton, Houston, Kent State, LBNL, LLNL, Michigan State,
Oak Ridge, Purdue, Tennessee, Texas, Wayne State, and Yale
ALICE-USA Primary Focus
• Investigate medium modification of partonic energy loss – “jet quenching”
• Investigate response of medium to large energy depositions
• Ensure the EMCal is constructed, operational in ALICE; extract EMCal physics
ALICE-USA Equip. Proposal to DOE for Major Fraction of ALICE EMCal
• Construct 8 of 11 super-modules of EMCal for ALICE
•(Italy and France to construct 3)
• CERN LHC Committee approved EMCal for installation in ALICE in Oct. 2006
• Passed CDs-0,1 Reviews of DOE
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Scientific Focus of ALICE-USA
Primary Scientific Goal
“Investigate QCD matter and measure its properties at high at the LHC”
Primary Focus – Utilize Hard Parton Scattering (& measure Eparton)
• High energy jets, photons and heavy flavors requires EMCal and triggering
Exploit large kinematic range of jets at LHC
Measure jet structure & medium-induced jet modification
Investigate energy loss mechanism with
quark-tagged jets (heavy flavor decays)
gluon jets (light hadron leading)
– jet coincidences
• Low energy particles correlated with trigger or quenched jet
requires ALICE acceptance, robust tracking, & PID to low/high
pT
Investigate energy propagation in medium to determine medium properties
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Jet Yields per LHC Year & Jet Trigger Enhancements
Jet yield in 20 GeV bin
Large gains due to jet trigger
Large variation in statistical reach for different reference systems
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Jet Trigger Enhancements vs Reference System
Jet triggerIncludes acceptance, efficiency, dead time, energy resolution
Complete systematic study requires all reference systems.
L1 jet “patch” trigger
x = 0.4 x 0.4
Also e, cluster trigger enhancement
factors 10 – 100 for Pb-Pb to p-p
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Medium Modification of Fragmentation from Jets
Fragmentation along jet axis: z = phadron / p parton
Introduce = ln(Ejet / phadron) ~ ln (1/z):
jet directionz
N. Borghini, U. Wiedemannhep-ph/0506218
# particles with low z increases
# particles with high z deceases
z/1ln
pThadron~2 GeV
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE-USA Manpower
ALICE-USA Collaboration Manpower Estimates
from 10 DOE-supported research institutions:
Creighton , Houston, Kent State, LBNL, LLNL, Oak Ridge, Purdue,
Tennessee,
Wayne State, and Yale
FTEs estimate for:EMCal detector support, trigger, computing, simulations & analysis, and papers
(anticipate additional manpower from Texas, MSU)
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE-USA Common Fund & M&O Fees to CERN
FY07
Common Fund = 5 DOE-supported institutions * CHF 45K = CHF 225K
• CHF 225K (* 0.80) = $180K
M&O = 18 DOE collaborators * CHF 14K = CHF 252K (*0.80) = $202K
FY08
Common Fund = 5 new DOE-supported institutions * CHF 45K = CHF 225K
• CHF 225K (* 0.80) = $180K
M&O = 35 DOE collaborators * CHF 14K = CHF 490K (*0.80) = $392K
FY09
M&O = 40-50 DOE collaborators * CHF 14K = CHF 560-700K (*0.80) = $448-560K
Note - FY07, 08, 09 Common Fund payments total = $360K could be spread over three years amounting to
$120K per year for each of FY07, 08, 09.
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
ALICE-USA Computing (Soltz Presentation)
ALICE-USA Computing Resources
Requires DOE investment in NERSC/PDSF cluster
(half of projected ALICE-USA computing resources)
Additional resources from
LLNL Livermore Computing (LC)
Ohio Supercomputing Center at the Ohio State Univeristy (OSC/OSU)
Texas Learning Center at University of Houston. (TLC/UH)
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Summary of ALICE-USA Request
Request overall DOE support for:
research and participation in ALICE of 10 institutions under review
construction of the US EMCal ($13.3 M)
computing in ALICE
Cost of support from DOE Heavy Ion Research:
redirection of effort from RHIC to ALICE : $2.7M in 2007 $3.8M in 2009
new support: $0.69M in 2007 $1.48M in 2009 (+ 1FTE includes computing)
plus $0.36M one-time fee for 2007-2009
one-time: $0.36M - CERN institutional fees (can be spread over 2007 – 2009)
annual: $0.20M in 2007 increasing to $0.45M in 2009 for CERN M&O fees
$0.05M starting in 2009 in CERN detector fees
$0.18 in 2007 to $0.4M in 2009 for sppl. travel to participate in experiment & install
EMCal
$0.23M annually in new research support
computing: $0.08M in 2007 increasing to ~ 0.35M +1 FTE in 2009 estimated for computing
hardware
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John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007
Concluding RemarksSignificant new high pT heavy ion physics at LHC
ALICE - versatile, general purpose heavy ion detector at LHCwill contribute significantly to understanding of HI physics
ALICE-USA and EMCal add significant physics to ALICE & LHCmeasure and trigger on jets, photons, pi-zerosheavy quark jet tagstriggered jets response of medium
ALICE-USA seeks DOE support to participate in ALICEconstruct EMCalextract exciting, fundamental physics