1Melynda Brooks, LDRD Pre-Proposal
Exploring a New Frontier with Heavy Ion Collisions at the
Large Hadron Collider
Melynda Brooks, Pat McGaughey, Mike Leitch, Gerd Kunde, Hubert van Hecke, Camelia Mironov
P-25
Andi KleinP-23
Ivan Vitev, Rajan GuptaT-Division
2Melynda Brooks, LDRD Pre-Proposal
LHC and RHIC
free partons
Why Heavy Ion Physics?
3Melynda Brooks, LDRD Pre-Proposal
LHC and RHICPb Pb Quark-Gluon Plasma
QUEST: What is the Equation-of-State of the Quark-Gluon Plasma ?
One of the 11 science questions for the new century
free partons
Why Heavy Ion Physics?
4Melynda Brooks, LDRD Pre-Proposal
Naïve Model of Quark Gluon Plasma “gas” strongly refuted - sQGPMedium Interactions more complicated than anticipatedExclusive processes, differential probes, higher energies required (LHC)
Puzzles: light/heavy quark suppression, jet shapes, screening like SPS
• Heavy quarks significantly modified by medium as well as light quarks!• Di-hadron correlation measurements show surprising structure in central collisions!• Vector meson measurements suggest significant new contributions to particle production may
be present!
RA
A
Npart
RHIC Reveals Surprises
*LANL involvement in all analyses
5Melynda Brooks, LDRD Pre-Proposal
Radiography/Tomography in Medical Imaging:• calibrated probe, well understood interaction • 3-D density profile of the medium from the absorption profile of the probe
Jet Radiography in Heavy-Ion Collisions:• Jets are auto-generated probes and need to be calibrated• Density profile of the Quark-Gluon Plasma from jet modifications
Di-jet in p+p
Jet in the QGP
Pb Pb
powerful analogy
Why the LHC, CMS?Hotter, denser, longer-lived Quark Gluon Plasma
6Melynda Brooks, LDRD Pre-Proposal
Ivan Vitev, JRO, then TSM recognized leader in HI theory, Rajan Gupta lattice expertDevelopment of PHENIX Physics Program, 1 of 2 RHIC detectors (1990-present)Project Managers for Muon Tracker Spectrometers - 1/2 of PHENIX (1990-present)Detector Council Members (1990-present)Executive Council Members (most years)Physics Working Group Conveners (3 separate members, each 2-year term)Leaders in Muon Physics Program, Jet analyses
$3.2M support in FY08 for RHIC program
$5M Silicon Upgrade awarded to PHENIX, LANL Management (following LDRD)
LANL Recognized Leader in Community through RHIC
2000 2010 2020 20301990
Tevatron
RHIC
LHC
LHC Needed for next step in physics understanding Natural progression of Heavy Ion Program from RHIC to LHC expectedNow is the time to join - data in 2010
7Melynda Brooks, LDRD Pre-Proposal
Road to Joining LHC Identified Exciting Physics Program at LHCExpertise to develop and carry out new program available at LANL,
time is rightStrong endorsement from CMS Heavy Ion to join - Bolek Wyslouch,
MIT, U.S. Heavy Ion Leader
Provide significant contribution to CMS collaboration to provide motivation for adding us to the collaboration - Current LDRD ER
Provide significant contribution to DOE NP to provide motivation for long-term support of LANL group at LHC
• DOE already recognizes physics expertise• Strong scientific program within CMS - should expand • DOE-Recognized detector capabilities, but CMS is “complete” - propose to
explore Heavy Ion data taking issues• National Lab-type contributions to hardware desired
LDRD DR
8Melynda Brooks, LDRD Pre-Proposal
LDRD DeliverablesExpand physics analysis effort into the
heavy quark sector Strong Scientific Contributions established
Address issues with Heavy Ion data taking specifically. Clear NP contribution
Develop theory needed to interpret LHC results - Local theoretical expertise significantly helps in strengthening scientific program
W.Horowitz, M. Gyulassy, (2007)
I.Vitev (2007)
Investigate the predictions of current models at the LHC. We will develop the consistent QGP dissociation model of both heavy mesons and heavy quarkonia. We will demonstrate how CMS data can be used to distinguish between models
Heavy Quark Predictions
9Melynda Brooks, LDRD Pre-Proposal
Design R&D
Construction Running
RHIC in 2000: first collisions June 12– 1st paper July 19, dNch/d, excluding 90% of predictions
• 2nd: Aug 24, 22k MB events, flow surprise ( v2)
– ~ 3 weeks run, very low L, > 10 PRL’s within < 1 year
1 y 3 y 9 y UA1 (1977 – 1989)W Z1 y 3 y 9 y UA1 (1977 – 1989)Z
You want to be there from the first minute!
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are needed to see this picture.
10Melynda Brooks, LDRD Pre-Proposal
Why LANL?
LANL capabilities relevant to CMS / LHC program:• Muon detection and reconstruction (FNAL, RHIC experiments)• Silicon vertex detectors (FNAL, LEP, RHIC),
for superLHC upgrades in 2013• Large scale computing for event simulation and reconstruction• Theory – T-8 and T-16 expertise in NP• Long history of DOE funded research in high energy nuclear
physics
LHC is future of High Energy Nuclear Physics programs –• Timely opportunity to establish a new program at LHC,
p+p collisions beginning next year• Seed money needed to ensure long-term DOE funding for NP
program
11Melynda Brooks, LDRD Pre-Proposal
LDRD-Supported Efforts
Heavy Quarks as a New Probe of the Quark Gluon Plasma (iFVTX) - $1700k/year 2006-2008 (following LDRD ER 2003-2005)
Heavy Ion Physics at the LHC using CMS - 2006-2008 $250k/yearThe First Precise Determination of Quark Energy Loss in Nuclei (FNAL E906) 2008-2010 $250k/yearDiscovery Physics at the Large Hadron Collider - proposed FY09-FY11$1300k/year
received $500k/year
LDRD History
