Ultrarelativistic heavy ion collisions theory group at Jyväskylä

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1 Ultrarelativistic heavy ion collisions theory group at Jyväskylä Personnel Seniors Kari J. Eskola professor Tuomas Lappi Academy research fellow, QCD HIP-project leader Thorsten Renk Academy research fellow Postdocs Harri Niemi JYFL Hannu Paukkunen HIP Redamy Perez-Ramos Academy/HIP PhD students Risto Paatelainen Wihuri foundation postdoc at USC, Spain 10/2014 Ilkka Helenius Väisälä f. / HIP postdoc at Lund U., Sweden 9/2014 Heikki Mäntysaari + 5 MSc Students Thorsten Renk, for the group PANU grad. school Funding, averaged over the last years: O(0.5M /year) = JU budget 34% + Academy of Finland 38% + HIP 12% + private f s 9% + PANU 7%

2 Our group s history URHIC hydrodynamics since 80s: prof. Ruuskanen (founder, retired in 2006) perturbative QCD in URHIC: Eskola since 1997 (prof. in 2007) URHIC jet simulations: Renk since 2005 small-x (CGC) studies: Lappi since 2009 Initiative for the local ALICE exp. group 1998 from Äystö, Ruuskanen, Kajantie URHIC theory part of the Helsinki Institute of Physics (HIP) Theory Programme since 2002: currently QCD project by Lappi Close local collaboration with particle theory & cosmology groups teaching + student recruitment JYFL/HIP ALICE group + physics + common weekly seminars Strong international collaboration Individual researchers from Santiago de C., Frankfurt, Duke, Saclay, BNL, VECC, Theory collaborations: Hard Probes, TECHQM & JET collaborations, EU networking: TORIC/TURIC WPs of Hadronphysics1,2,3, Physics planning of future EIC (USA), LHeC, FCC

3 URHIC physics Testing the strong interaction part of the Standard Model - determine the properties of elementary-particle QCD matter, Quark-Gluon Plasma - understand QCD collision dynamics at high energies and densities Our long-term goal a simultaneous theory-analysis of various URHIC-observables, based on which the QGP properties can be determined from CERN-LHC and BNL-RHIC measurements Methods perturbative QCD, high-energy QCD ( CGC ), relativistic hydrodynamics, MC simulations, supercomputing at CSC Initial state Hydrodynamic expansion decoupling photons jets We are wordwide one of the few theory groups able to address this full evolution and different probes with in-house expertise! 3

4 Examples of our world-expertise: 1. Perturbative QCD analysis of quark and gluon densities in nuclei: nuclear PDFs our pioneering work EKS98 is a standard reference [Eskola, Kolhinen, Salgado, Eur.Phys.J.C9:61, cit.] our EPS09 NLO is the current state of the art [Eskola, Paukkunen, Salgado, JHEP 0904:065, cit.] Nuclear modifications of PDFs We have quantified the unknown: using the EPS09 error sets, one can compute how these uncertainties propagate into hard-process cross sections in A+A, p+a, d+a, collisions Many applications at RHIC & LHC! EPS09s: spatially dependent npdfs [Helenius, Eskola, Honkanen, Salgado, JHEP 1207 (2012) 073] [dijets; CMS at QM14]

5 2. Small-x physics = QCD in the high-e limit gluon saturation & CGC ridge The ridge in p+p collisions at the LHC QCD origin for the ridge correlation, observed in highmultiplicity p+p events, in the Color-Glass Condensate framework [Dumitru, Dusling, Gelis, Jalilian-Marian, Lappi, Venugopalan, Phys. Lett. B697 (2011) cit.] J/Psi in ultraperipheral Pb+Pb at LHC [Lappi, Mäntysaari, Phys.Rev. C87 (2013) ] BK-RGE phenomenology from HERA to particle production at the LHC [Lappi, Mäntysaari, Phys. Rev. D88 (2013) ] [ALICE, Eur.Phys.J. C73 (2013) 2617] [ALICE at QM2014]

6 3. Hydrodynamical simulations Event-by-event MC simulations [Holopainen, Eskola, Niemi, Phys.Rev. C83 (2011) cit.] explain the measured azimuthal momentum asymmetry in Au+Au at RHIC NPA Young Scientist Award, best theory talk in QM11 Limits for QCD matter viscosity Developed the EKRT pqcd+saturation model for computing the QGP initial densities for hydro [Paatelainen et al, Phys.Lett. B731 (2014) ] multiobservable analysis after viscous hydro Kinetic theory foundations of hydro [Denicol, Niemi, Molnar, Rischke, Phys.Rev.D85(2012) ]

7 4. Hard and electromagnetic probes Thermal photons in A+A vs hard pqcd photons [Chatterjee, Holopainen, Helenius, Renk, Eskola, Phys.Rev. C88 (2013) ] Jets & high-pt hadrons MC simulations of in-medium parton showers YaJEM [Renk, Phys.Rev. C78 (2008) ] Hydro w. QCD-based initial state modeling LHC p+p, pqcd Jet quenching [Renk, Holopainen, Paatelainen, Phys.Rev. C84 (2011) ] Renk, Phys.Rev. C87 (2013) 2,

8 We are internationally well connected and visible e.g. at the Quark Matter 2014 conference (Darmstadt 5/2014; ~900 participants) we had 7 participants 1 plenary talk (Niemi; hydro review) 3 parallel talks (Lappi, Paukkunen, Renk) 3 posters (Mäntysaari, Paatelainen, Paukkunen/Helenius) invited lectures at the Student Day (Renk) a member in the IAC (Eskola) and Tuomas Lappi received the 2014 Zimanyi Medal = the most prestigious international young researcher award in this field

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