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Phases of QCD matter

Phases of QCD matter. Sourendu Gupta. Logic behind my work. Observation of at least one phase transition: therefore heavy-ion collisions Lattice gauge theory: predictions for properties of matter produced in heavy-ion collisions

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Phases of QCD matter

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  1. Phases of QCD matter Sourendu Gupta

  2. Logic behind my work • Observation of at least one phase transition: therefore heavy-ion collisions • Lattice gauge theory: predictions for properties of matter produced in heavy-ion collisions • Formalism for analyzing various experimental observables: weak coupling theory, hydrodynamics, etc.

  3. Heavy-ion collisions Coauthored Alice physics TDR Working with STAR on use of fluctuations to find the critical end point of QCD Fluctuations are direct probes of 2nd derivatives of the free energy. They could be measured in event by event distributions of conserved quantities: B, Q, S, I. • Fluctuations of conserved quantities • Hydrodynamics: can it be used to extract information on the equation of state? • Heavy quark production • Jets in heavy-ion collisions at LHC • Photon and dilepton production See Bhalerao + Gavai Datta joins next month Jet quenching observed in RHIC using leading hadrons. Fully reconstructed jets possible at LHC, and can give more information. (old work: thermometry) Collaborating with experimentalists to investigate use of new modules in the Alice detector for jet thermometry Analytic continuation of Euclidean correlation functions: related to transport coefficient (later)

  4. Measured Euclidean vector current correlator in quenched QCD using staggered quarks. Continued to Euclidean using a Bayesian method with different priors (constant function, continuous, smooth, etc; not MEM). Saw bump at small w: transport like. Fitted sequence of functions and extracted electrical conductivity. Lattice Gauge Theory Gavai’s talk • Phase diagram at finite T and  • Equation of state, the speed of sound, the specific heat, compressibility • Transport coefficients: electrical conductivity is the simplest (Bayes) • Screening phenomena: Debye screening, hadronic screening lengths (overlap) EOS: Gavai, SG, Mukherjee Bhalerao+Gavai Meson quantum numbers screened: compatible With q-qbar pair at short distances. Long distances no real quantitative understanding: lattice results available, lack complete weak coupling theory. Results recently obtained with overlap quarks. No such simplicity in the magnetic gluon sector. Construct screening masses of two different gluon operators: one needs 2 electric gluon exchange, another 3. Ratio of screening masses is 3:2 above 1.25 Tc. From screening masses try to understand the degrees of freedom in the QCD plasma. Gavai, SG, Majumdar Gavai, SG, Lacaze

  5. Future • Very strong need for computational power • Need to expand scope of activity: need theorists in heavy-ion physics phenomenology, QCD astrophysics, hadron phenomenology • Very useful to have heavy-ion experimentalists in TIFR: none now. Typically need to enhance computer power by factor 10 every 3 years. 200 Mfl peak now available (installed in 2004), May get 10 Tfl by 2010. Other groups using 10 Tfl now. 1 Pfl by 2012? Way behind the world: need an order of magnitude leap now, and sustained funding afterwards.

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