Conveners
Initial state physics: 1
- Carlos Pajares (University Santiago de Compostela)
Initial state physics: 2
- Kari J. Eskola (University of Jyvaskyla)
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Raju Venugopalan19/05/2014, 11:00Initial State PhysicsContributed TalkThe ridge in pp, p/d+A and A+A collisions manifest at very high multiplicities. Regardless of whether initial state or final state effects dominate, the physics of very high parton densities is relevant. In this talk, we attempt a synthesis of the state-of-the art in the CGC approach to computing both initial state and final state effects that generate collimated long range rapidity...Go to contribution page
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Kevin Dusling19/05/2014, 11:20Initial State PhysicsContributed TalkWe explore the detailed structure of the {\em ridge} in the Color-Glass-Condensate (CGC) effective field theory of QCD and demonstrate a novel mechanism that produces a non-vanishing $v_3$ without final-state re-scattering. A $v_3$ in agreement with the LHC p+Pb data is generated by the interference of diagrams attributed to the jet (away-side) and ridge (near-side) substructure of the...Go to contribution page
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Prithwish Tribedy (VECC)19/05/2014, 11:40Initial State PhysicsContributed TalkThe IP-Glasma model of initial conditions based on the *ab initio* color glass condensate (CGC) framework successfully explains the bulk features of global data for various systems like p+p, p+A and A+A over a wide range of energies [1-3]. We employ this framework to study deformed U+U collisions, asymmetric Cu+Au collisions and the effect of deformation in Au+Au collisions at RHIC. A...Go to contribution page
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Hui Wang (Brookhaven National Lab)19/05/2014, 12:00Initial State PhysicsContributed TalkThe azimuthal anisotropy of particle production is commonly used in high-energy nuclear collisions to study the early evolution of the expanding system. The prolate shape of uranium nuclei provides the possibility to study how the initial geometry of the nuclei affects the azimuthal distributions. It also provides a unique opportunity to understand the initial conditions for particle...Go to contribution page
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Joakim Nystrand (University of Bergen (NO))19/05/2014, 12:20Initial State PhysicsContributed TalkVector mesons are copiously produced in ultra-peripheral nucleus-nucleus collisions. In these collisions, the nuclei are separated by impact parameters larger than the sum of the nuclear radii, and the interaction is mediated by the electromagnetic field. The interaction effectively corresponds to a photonuclear interaction between a photon, generated from the electromagnetic field of...Go to contribution page
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David d'Enterria (CERN)19/05/2014, 12:40Initial State PhysicsContributed TalkWe have derived a simple generic expression to compute the cross sections for double-parton scatterings (DPS) in high-energy proton-nucleus and nucleus-nucleus collisions as a function of the corresponding single-parton hard cross sections [1,2]. Estimates of DPS contributions at LHC energies for (i) same-sign W-boson pair production in p-Pb, and (ii) double-J/$\psi$ production in Pb-Pb,...Go to contribution page
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Michael Linus Knichel (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))19/05/2014, 16:30Initial State PhysicsContributed TalkLight flavor transverse momentum spectra at intermediate and high $p_{\rm T}$ are important as baseline perturbative QCD measurements in pp, evaluating initial state effects (nuclear p.d.f.'s) in p-Pb, and for investigating the suppression in Pb-Pb collisions. In this talk results for all these collisional systems will be presented. The new measurement of $R_{\rm pPb}$ for unidentified...Go to contribution page
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Dr Alberica Toia (Johann-Wolfgang-Goethe Univ. (DE))19/05/2014, 16:50Initial State PhysicsContributed TalkMeasurements of particle production in proton-nucleus collisions provide a reference to disentangle final state effects, i.e. signatures of the formation of a deconfined hot medium, from initial state effects, already present in cold nuclear matter. While most of the benchmarks from the control experiment indicate that initial state effects do not play a role in the observed...Go to contribution page
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Mauricio Martinez Guerrero (The Ohio State University)19/05/2014, 17:10Initial State PhysicsContributed TalkWe study medium modifications to the interference pattern between initial and final state radiation. We compute single gluon production off a highly energetic parton that undergoes a hard scattering and subsequently crosses a dense QCD medium of finite size. Multiple soft scatterings with the medium are resumed within the harmonic oscillator approximation. We find the decoherence of correlated...Go to contribution page
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Li Yi19/05/2014, 17:30Initial State PhysicsContributed TalkLong-range pseudo-rapidity ($\Delta\eta$) correlations at small azimuthal difference ($\Delta\phi$) are observed in high multiplicity p+p and p+Pb collisions at the LHC. Subtraction of the di-hadron correlation in low-multiplicity p+Pb collisions from high-multiplicity ones reveals a back-to-back double ridge structure ($\Delta\phi\approx 0$ and $\pi$). A similar double ridge is observed in...Go to contribution page
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Zhongbo Kang (L)19/05/2014, 17:50Initial State PhysicsContributed TalkThe quest for experimental signatures of small-x gluon saturation has been one of the major goals in p+A (d+A) programs at RHIC and LHC. Experimental measurements of single particle and two-particle correlations in the forward direction have revealed novel nuclear suppression patterns, which might help pinpoint the small-x gluon dynamics. At the moment there are two formalisms which can both...Go to contribution page
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Dr Hannu Paukkunen (University of Jyväskylä)19/05/2014, 18:10Initial State PhysicsContributed TalkWe present a perturbative QCD analysis concerning the production of high-pT dijets in p+Pb collisions at the LHC. The next-to-leading order corrections, scale variations and free-proton PDF uncertainties are found to have only a relatively small influence on the normalized dijet rapidity distributions. Interestingly, however, these novel observables prove to retain substantial sensitivity...Go to contribution page