Prospects with Heavy Ions at the LHC
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1 Prospects with Heavy Ions at the LHC
2 The Quark-Gluon Plasma at RHIC & LHC So far at RHIC: Elliptic Flow Near-perfect Fluid High p T Suppression Strongly-coupled QGP R AA! d 2 N AA dydp T d 2 N pp!!! AA dydp T N coll!! Jet Quenching Strongly-coupled QGP Away-side of jet Energy dissipation/propagation in medium Medium properties? Near-side Ridge!!!! Something new, unresolved Heating of the system Longitudinal expansion? Initial parton distributions? Initial parton bremsstrahlung + flow? RHIC and LHC: Cover 2 3 decades of energy ( s NN ~ 20 GeV 5.5 TeV) What are the properties of hot QCD in this temperature range (T ~ MeV)?
3 BIG Physics Questions for RHIC & LHC Heavy Ions - How does the system evolve/decohere from its initial state? - Initial state saturation / color glass? - Rapid thermalization - how? - What are the properties & constituents (vs. T) of the QGP? - e.g., screening length, bulk/shear viscosity, v s, diff. coeff.,. - How do partons lose energy in the QGP? - How does the QGP respond to large energy deposition ( jet heating ) - Response of medium (e.g. away-side, near-side ridge)? - How does hadronization take place?
4 Simple Expectations - Heavy Ion Physics at the LHC s NN (GeV) factor 28 t form (fm/c) T / T c ε (GeV/fm 3 ) τ QGP (fm/c) SPS RHIC LHC 0.1 shorter hotter denser > 10 longerlived
5 Hard Scattering with Heavy Ion Physics at the LHC Significant increase in hard scattering yields at LHC: - jets & large p T processes - σ bb (LHC ) ~ 100 σ bb (RHIC) - σ cc (LHC) ~ 10 σ cc (RHIC)
6 How Will LHC Heavy Ions Contribute? - How does the system evolve/decohere from its initial state? - LHC extends reach to very low-x phenomena - What are the properties & constituents (vs. T) of the QGP? - LHC extends reach to higher T - LHC extends abundance & diversity of probes (e.g. flow of heavy quarks & quarkonia v 2 scaling?) - How do partons lose energy in the QGP? - LHC extends reach in mass, flavor, and p T of hard probes (different parton probes, jets, Z-bosons, heavy quarks, quarkonia) - How does the QGP respond to jet heating response of medium (e.g. away-side, near-side ridge)? - Trigger on hard probes (above) of different mass, flavor and p T - How does hadronization take place? - Investigate intermediate p T (5 15 GeV/c) hadron production - Investigate fragmentation process in detail (hadrochemistry in jets) - Investigate production of new scaler and vector particles
7 LHC Heavy Ion Collider Program LHC to start s = 14 TeV p + p operation in Spring 2008 LHC Heavy Ion operation - s NN = 5.5 TeV Pb + Pb - Anticipate 1 month per year Detectors - ATLAS - CMS - ALICE
8
9 LHC Heavy Ion Collider Experiments ATLAS ATLAS Multi-purpose, large acceptance system. Designed for large p T with extensive calorimetry for detailed jet studies. CMS Multi-purpose, large acceptance system. Designed for large p T with calorimetry for detailed jet studies. CMS ALICE ALICE Dedicated heavy ion experiment. Large suite of detectors for tracking and PID from 100 MeV/c to 100 GeV/c. Proposed calorimetry for jet trigger and studies.
10 AdS/CFT (and all theories) Meets Heavy Ions at the LHC
11 Prospects for AdS/CFT with LHC Heavy Ions LHC ions will investigate v 2 for light & heavy particles (π,. φ, Ω,.B, D, J/ψ, ) PHENIX, PRL 98, (2007) From PHENIX non-γ e-data, transport models require: small heavy quark relaxation time small diffusion coefficient D HQ x (2πT) ~ 4 6 constrain viscosity/entropy η/s ~ (1.5 3) / 4π within factor 2-3 of AdS/CFT conjectured lower bound* consistent with light hadron v 2 analysis * Kovtun, Son, Starinets, hep-th/
12 Prospects for AdS/CFT with LHC Heavy Ions What about the v2 Quark Scaling at intermediate p T? Baryons quarks flow collectively Mesons My naïvete : how does this work? Early flow & constituent quark scaling?
13 Prospects for AdS/CFT with LHC Heavy Ions What is the dynamical origin of parton energy loss (quenching, suppression)? What happens to the radiation? Interference effects? Dist. relative to parton? How does parton lose energy? q ~ μ Λ ε E What is dependence on mass, flavor and energy of parton? What about recoil energy of collisional E-loss? ΔE gluon > ΔE quark, m=0 > ΔE quark, m>0 One parameterization of energy loss q ^ = μ 2 / Λ
14 Jets & High p T Particles with LHC Heavy Ions Fragmentation: z p p hadron parton R cone Jet Physics - Jets: measure parton E & E-loss, jet-tag (B vs. light quark, gluon) long. & transverse mod. of jet - γ-jet, Z 0 -jet, di-jet: parton E & E-loss - Hadrochemistry in Jets fragmentation function mod. light flavored mesons gluons parents D-mesons quark parents (m c ~ 0) B-mesons quark parents (m b > 0)
15 q^ Parameterization of Parton Energy Loss at RHIC >100 GeV? Eskola, Honkanen, Salgado, Wiedemann Nucl Phys A747 (2005) 511 q ~ μ Λ q ^ = 5 15 GeV 2 / fm from RHIC R AA Data LHC? R AA (p T )?
16 AdS 5 /CFT Parton Energy Loss Results & Future! from J. J. Friess, S. S. Gubser and G. Michalogiorgakis,arXiv:hep-th/ H. Liu, K. Rajagopal and U. A. Wiedemann, arxiv:hep-ph/ , recent PRL
17 AdS 5 /CFT Parton Energy Loss Results & Future! Future for AdS/CFT: What is the velocity dependence of energy loss? What is the mass & flavor (q, g) dependence of energy loss? What is radiated from the partons?
18 A Near-side Ridge Appears at RHIC! Trigger jet Near-side ridge Di-hadron correlations Trigger Jet (near-side) Near-side ridge Au+Au 0-10% preliminary η 3 < p t,trigger < 4 GeV p t,assoc. > 2 GeV J. Putschke, STAR, QM 2006 Jets: scale with # of binary collisions Ridge: exists to highest p T (trig) correlated with jets But ridge spectra ~ same as medium ( bulk-like, seen for mesons/baryons) John Harris thermal (Yale) spectra AdS/CFT + flow Strings origin? jet-heating?... Intersect Beams at Columbia, 26 Oct. 2007
19 Possible Ridge Mechanisms So Far References to proposed explanations so far: Radiated gluons, broadened by Longitudinal flow, Armesto et al, PRL 93 (2004) Color magnetic fields, Majumder et al, hep-ph/ Medium heating + recombination, Chiu & Hwa, PRC72, Radial flow + trigger particle bias, Voloshin, N.P. A749, 287, Shuryak nuc-th/ Initial parton scatter + Jet-medium interactions, C.Y. Wong, hep-ph/
20 Response of the Medium in AdS/CFT hep-ph/ v >> v s hep-th/ Questions for AdS/CFT: Dependence on mass, flavor and velocity?
21 Heavy Flavors at the LHC cc and bb rates (ALICE PPR) system NN x-sect (mb) shadowing total multiplicity p + p, 14 TeV 11.2 / / / Pb + Pb, 5.5 TeV (5%) 6.6 / / / 4.6 R AA of D and B-mesons to large p T at LHC AdS/CFT de/dx of heavy quarks - S. Gubser, Drag Force in AdS/CFT, hep-ph , hep-th/ Chesler & Yaffe, hep-th/ Horowitz & Gyulassy, nuc-th/
22 Color Screening of the Medium? J/ψ and Υ Physics - Melting of quarkonium states: - initial T - suppression / regeneration Events/100 MeV J/ψ Y M μμ J/ψ Υ - color screening of medium? SPS RHIC regeneration? Υ LHC Υ suppression?
23 AdS/CFT & Color Screening of the Medium? hep-ph/ E. Caceres, M. Natsume, T. Okamura, hep-th/
24 Medium Modification of Fragmentation from Jets Fragmentation along jet axis: z = p hadron / p parton Introduce ξ = ln(e jet / p hadron ) ~ ln (1/z): jet direction z N. Borghini, U. Wiedemann hep-ph/ # particles with low z increases Pb+Pb 0-10% / p+p Ideal R=1.0 pt=0.0 EMCAL + tracking R=0.4, pt=1.0 Annual ALICE run statistics <E Input >~175 GeV Pb+Pb 0-10%: <q>=50 # particles with high z deceases p T hadron ~2 GeV ξ = ln( 1/ z) ξ=ln(e Black line = radiative E-loss Dashed line = flat Collisional E-loss? 0.5 corr rec /p )
25 Medium Modifications and Jet Hadrochemistry Parton energy loss can alter: parton s color charge (flavor, baryon #?) J AA R AA in jet cone Sapeta & Wiedemann, hep-ph/
26 Hadronization, Fragmentation, Medium Modification Fragmentation at lower z in jets Hadronization of lower p T particles from colored medium. Both impacted by medium properties Microscopic hadronization process? z z Bourrely & Soffer, hep-ph/ : Each flavor parton - contributes differently to fragmentation function. - loses different amounts of energy in medium. Study z = p hadron /p jet Requires high p T identified particles Jets, Intra- & inter-jet particle correlations
27 The Quark-Gluon Plasma at the LHC At LHC: Is the QCD phase diagram feature-less at 1 4 T c? What happens as we go up in T (e.g. coupling)? Are there new phenomena? R AA d 2 N AA dydp T d 2 N pp AA dydp T N coll What s the range of theoretical validities (non-pqcd, pqcd, strings)? Measure/understand parton energy loss at the fundamental level Establish flavor (gluon and quark mass) dependence Use jets and/or photons to establish hard-scattered parton energy Jet modifications - longitudinal & transverse heating Medium response to jet-heating (near- and away-side) Measure/use open charm and beauty decays (also as jet-tags) cc and bb states (screening, suppression, enhancement?) Direct Photon Radiation? Developments in theory (lattice, hydro, parton E-loss, string theory ) the next frontier!
28 AdS/CFT Meets Heavy Ions at the LHC Summary of Physics Questions for both What is: - the velocity dependence of energy loss? - the flavor (q, g) dependence of energy loss? - radiated from partons in energy loss? - the response of the medium? - the color screening of the medium? - the particle type dep. of viscosity (flow)? - the basis for quark scaling of v 2 at inter. p T - hadronization mechanism?
29 The End The Beginning
30 Thanks for Discussions / Contributions to This Presentation!! Miklos Gyulassy Dima Kharzeev Peter Jacobs Urs Wiedemann
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