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ALICE-USA Collaboration, Physics and Approach

Alice. Dedicated “general purpose” Heavy Ion experiment at LHC. ALICE-USA Collaboration, Physics and Approach. LHC. ALICE-USA Collaboration. ALICE-USA Author List (2009) - 44 ( + new ) PHDs + 15 graduate students Cal. Poly, San Luis Obispo (NSF) – J. Klay, postdoc

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ALICE-USA Collaboration, Physics and Approach

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  1. Alice Dedicated “general purpose” Heavy Ion experiment at LHC ALICE-USA Collaboration, Physics and Approach LHC John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  2. ALICE-USA Collaboration ALICE-USA Author List (2009) - 44 (+ new) PHDs + 15 graduate students Cal. Poly, San Luis Obispo (NSF) – J. Klay, postdoc Creighton U. – M. Cherney, Y. Gorbunov, B. Rizzo (gs), J. Seger U. Houston - L. Pinsky, A. Empl, B.W. Mayes II, C. Delgenio (gs), D. Minthaka (gs), graduate student Kent State U. – S. Margetis, D. Keane, W. Zhang, postdoc, graduate student LBNL – P. Jacobs, S. Klein, G. Odyniec, J. Putschke, H.G. Ritter, TJM Symons, M. van Leeuwen LLNL – R. Soltz, A. Glenn, J. Newby Michigan State U. – G. Westfall, + TBD ORNL – T. Awes, P. Stankus, D. Silvermyer, G. Young, postdoc Purdue U. - R.P. Scharenberg, B.K. Srivastava, and grad student(s) U. Tennessee – S. Sorensen, K. Read, postdoc, grad. student U. Texas – C. Markert, + TBD Wayne State U. – T.M. Cormier, R. Bellwied, C.A. Pruneau, S. Voloshin, A. Pavlinov, + 2 postdocs and 3 grad. students Yale U. – J.W. Harris, J. Bielcik, J. Bielcikova, H. Caines, M. Heinz, S. Salur, N. Smirnov, T. Aronsson (gs), and 4 graduate students John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  3. Heavy Ion Physics at the LHC LHC 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 fromSPS  RHIC LHC? • expansion will be different (v2, HBT, Tchem & Tkin, • strange/charm particles & resonances) John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  4. sbb (LHC ) ~ 100 sbb (RHIC) scc (LHC) ~ 10 scc (RHIC) Heavy Ion Physics at the LHC LHC Heavy Ions – • guided by pQCD predictions • expectations (detectorsimulations) based on RHIC extrapolations and theory • lesson from RHIC –“expect the unexpected” Soft Physics at LHC – • smooth extrapolation fromSPS  RHIC LHC? • expansion will be different (v2, HBT, Tchem & Tkin, • strange/charm particles & resonances) Hard Probes at LHC – • significant increase in hard cross sections •  shard /stotal~ 2% at SPS • 50% at RHIC • 98% at LHC • “real” jets, large pT processes • abundance of heavy flavors • probe early times, calculable precision studies! John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  5. ALICE Set-up TOF TRD HMPID EMCal ITS PMD Muon Arm PHOS Size: 16 x 26 meters Weight: 10,000 tons TPC John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  6. (charged particles) EMCal µ arm ALICE Detectors & Acceptance central barrel -0.9 < h < 0.9 • Df = 2p tracking, PID(TPC/ITS/ToF) • single arm RICH(HMPID) • single arm e.m. cal (PHOS) • jet calorimeter (proposed EMCal) forward muon arm 2.4 < h < 4 • absorber, 3 T-m dipole magnet10 tracking + 4 trigger chambers multiplicity detectors -5.4 < h < 3 • including photon counting inPMD trigger & timing detectors • 6 ZeroDegreeCalorimeters • T0: ring of quartz window PMT's • V0: ring of scint. paddles John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  7. Particle Identification in ALICE PID capabilities unique to ALICE! Global tracking (ITS-TPC-TRD) dE/dx (low pT + relativ. rise) TOF, HMPID, PHOS p, K, p: 0.1- 0.15  50 GeV Topological reconstruction Invariant mass Decay particles:  10 - 15 GeV pT range (PID/stat. limits) in 109 pp or 107 central Pb-Pb PID in relativistic rise Pb-Pb Pb-Pb John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  8. John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  9. ALICE EMCal (Cormier Presentation) Approved by LHCC 9/28/06 • 10+1/2+1/2=11 super-modules • 8 SM from US • 3 SM from France, Italy Allows Jet Measurements/Triggering with ALICE Lead-scintillator sampling calorimeter Dh = 1.4, Df=110o Shashlik geometry, APD photosensor ~13K towers (DhxDf ~ 0.014 x 0.014) Energy resolution  15%/√E + 2% over-takes tracking above 30 GeV po/g discrimination to pT ~ 30 GeV John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  10. Capabilities of ALICE Extended by EMCal EMCal improves detector capabilities: - Fast trigger ~10 -100 enhancement of jets - Improves jet reconstruction (plus TPC) - Goodg/p0discrimination 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 • p0: pT ~ 75 GeV • inclusive g: pT ~ 45 GeV • inclusive e: pT ~ 30 GeV P.Jacobs John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  11. 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- p+) from TPC/ITS (charm and beauty) • Electrons in Transition Radiation Detector (TRD) Quarkonia (forward muon arm) • J/y, , ’ (excellent),’’(2-3 yrs),y’ (very difficult!) Jet Quenching & Medium Response • Leading particles to intermediate pT (range of intermediate pT at LHC?) • Away-side in TPC (with extended PID) measure e with pe> 10 GeV (where TRD…) 6x increased acceptance for g’s compared to PHOS trigger on leading p0 trigger on / measure jets John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  12. ALICE Collaboration ~ 1000 Members (~ 500 M&O PhDs) 63% CERN States ~ 8% expected US ~ 30 Countries ~ 100 Institutes~ 150 M CHF capital (+ L3 magnet) John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  13. ALICE-USA ALICE-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” • Investigateresponse of mediumto 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) • CERNLHC Committee approved EMCalfor installation in ALICE in Oct. 2006 • Passed CDs-0,1 Reviews of DOE John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  14. Scientific Focus of ALICE-USA Primary Scientific Goal • “Investigate QCD matter and measure its properties at high e at the LHC” Primary Focus – UtilizeHard Parton Scattering (& measure Eparton) • High energy jets, photons and heavy flavorsrequires EMCal and triggering • Exploitlarge kinematic rangeof jets at LHC • Measurejet structure&medium-induced jet modification • Investigate energy loss mechanism with • quark-tagged jets (heavy flavor decays) • gluon jets (light hadron leading) • g – 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 John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  15. Jet yield in 20 GeV bin Jet Yields per LHC Year & Jet Trigger Enhancements Large gains due to jet trigger Large variation in statistical reach for different reference systems John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  16. Jet Trigger Enhancements vs Reference System Complete systematic study requires all reference systems. Includes acceptance, efficiency, dead time, energy resolution Jet trigger L1 jet “patch” trigger Dh x Df = 0.4 x 0.4 Also e,g cluster trigger enhancement factors 10 – 100 for Pb-Pb to p-p John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  17. Medium Modification of Fragmentation from Jets jet direction z N. Borghini, U. Wiedemann hep-ph/0506218 # particles with low z increases # particles with high z deceases pThadron~2 GeV Fragmentation along jet axis: z = phadron / p parton Introduce = ln(Ejet / phadron)~ ln (1/z): John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  18. 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,andYale FTEs estimate for: EMCal detector support, trigger, computing, simulations & analysis, and papers • (anticipate additional manpower from Texas, MSU) John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  19. 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. John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  20. 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) John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  21. 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 John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

  22. Concluding Remarks Significant new high pT heavy ion physics at LHC ALICE - versatile, general purpose heavy ion detector at LHC will contribute significantly to understanding of HI physics ALICE-USA and EMCal add significant physics to ALICE & LHC measure and trigger on jets, photons, pi-zeros heavy quark jet tags triggered jets  response of medium ALICE-USA seeks DOE support to participate in ALICE construct EMCal extract exciting, fundamental physics John Harris (Yale) DOE Panel Review of ALICE-USA, May 23-24, 2007

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