Probing QGP-medium interactions

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Presentation transcript:

Probing QGP-medium interactions through high momentum probes Magdalena Djordjevic,

Suppression – a traditional probe of QCD matter Light and heavy flavour suppressions are considered as excellent probes of QCD matter. Suppression for a number of observables at RHIC and LHC has been measured. Comparison of theory with the experiments allows testing our understanding of QCD matter.

Suppression scheme e-, J/ hadrons partons 1) production 2) medium energy loss 3) fragmentation partons e-, J/ 4) decay Initial momentum distributions for partons Parton energy loss Fragmentation functions of partons into hadrons Decay of heavy mesons to single e- and J/.

Energy loss Is collisional energy loss also important? Initially, most of the energy loss calculations assumed only radiative energy loss, and a QCD medium composed of static scattering centers. (e.g. GW, DGLV, ASW,BDMPS...) However, these calculations lead to an obvious disagreement with the experimental data. Is collisional energy loss also important? Yes, collisional and radiative energy losses are comparable!

Non-zero collisional energy loss - a fundamental problem With such approximation, collisional energy loss has to be exactly equal to zero! Static QCD medium approximation (modeled by Yukawa potential). However, collisional and radiative energy losses are shown to be comparable. Introducing collisional energy loss is necessary, but inconsistent with static approximation! Static medium approximation should not be used in radiative energy loss calculations! Dynamical QCD medium effects have to be included!

Radiative energy loss in a dynamical medium We compute the medium induced radiative energy loss for both light and heavy quarks to first (lowest) order in number of scattering centers. To compute this process, we consider the radiation of one gluon induced by one collisional interaction with the medium. l<L Optical theorem L We consider a medium of finite size L, and assume that the collisional interaction has to occur inside the medium. The calculations were performed by using two Hard-Thermal Loop approach.

We calculated all the relevant diagrams that contribute to this energy loss Each individual diagram is infrared divergent, due to the absence of magnetic screening! The divergence is naturally regulated when all the diagrams are taken into account. So, all 24 diagrams have to be included to obtain sensible result. M. Djordjevic; arXiv:0903.4591. M. D., Phys.Rev.C80:064909,2009 (highlighted in APS physics).

Finite magnetic mass The dynamical energy loss formalism is based on HTL perturbative QCD, which requires zero magnetic mass. However, different non-perturbative approaches show a non-zero magnetic mass at RHIC and LHC. Can magnetic mass be consistently included in the dynamical energy loss calculations?

Generalization of radiative jet energy loss to finite magnetic mass zero magnetic mass From our analysis, only this part gets modified. Finite magnetic mass: . M.D. and M. Djordjevic, Phys.Lett.B709:229,2012

Dynamical energy loss - summary Computed both collisional and radiative energy loss, in a finite size QCD medium, composed of dynamical scatterers. M. D. PRC 80:064909 (2009), M. D. and U. Heinz, PRL 101:022302 (2008). Finite magnetic mass effects M. D. and M. Djordjevic, PLB 709:229 (2012) Includes running coupling M. D. and M. Djordjevic, PLB 734, 286 (2014). State of the art energy loss formalism in a dynamical finite size QCD medium.

Numerical procedure Light flavor production Z.B. Kang, I. Vitev, H. Xing, PLB 718:482 (2012) Heavy flavor production M. Cacciari et al., JHEP 1210, 137 (2012) Path-length fluctuations A. Dainese, EPJ C33:495,2004. Multi-gluon fluctuations M. Gyulassy, P. Levai, I. Vitev, PLB 538:282 (2002). DSS and KKP fragmenation for light flavor D. de Florian, R. Sassot, M. Stratmann, PRD 75:114010 (2007) B. A. Kniehl, G. Kramer, B. Potter, NPB 582:514 (2000) BCFY and KLP fragmenation for heavy flavor M. Cacciari, P. Nason, JHEP 0309: 006 (2003) Decays of heavy mesons to single electron and J/ according to M. Cacciari et al., JHEP 1210, 137 (2012)

Understanding the experimental data (200 GeV at RHIC and 2.76TeV at LHC)

All predictions generated What we will do: Provide joint predictions across diverse probes Concentrate on different experiments and different collision energies Address puzzling data Concentrate on all centrality regions Provide predictions for the upcoming experimental data All predictions generated By the same formalism With the same numerical procedure No free parameters in model testing M. Djordjevic 13

Comparison with LHC data (central collision) M. D. and M. Djordjevic, PLB 734, 286 (2014) Very good agreement with diverse probes!

Heavy flavor puzzle at LHC Significant gluon contribution in charged hadrons Much larger gluon suppression RAA (h±) < RAA (D)

Charged hadrons vs D meson RAA Excellent agreement with the data! ALICE data RAA (h±) = RAA (D) Disagreement with the qualitative expectations! M.D., PRL 112, 042302 (2014)

Hadron RAA vs. parton RAA probe of bare charm quark suppression D meson is a genuine probe of bare charm quark suppression Distortion by fragmentation Charged hadron RAA = (bare) light quark RAA M.D., PRL 112, 042302 (2014)

RAA (light quarks) = RAA (charm) Puzzle summary RAA (h±) = RAA (light quarks) RAA (light quarks) = RAA (charm) RAA (D) = RAA (charm) RAA (h±) = RAA (D) Puzzle explained! M.D., PRL 112, 042302 (2014)

Comparison with RHIC data (central collisions) Very good agreement! M.D. and M. Djordjevic, PRC 90, 034910 (2014)

RAA vs. Npart for RHIC and LHC Excellent agreement for both RHIC and LHC and for the whole set of probes! M. D., M. Djordjevic and B. Blagojevic, PLB 737 298 (2014)

MD, B. Blagojevic and L. Zivic, arXiv:1601.07852, PRC in press Differences in the heavy flavor RAA are a consequence of the “dead-cone” effect.

Predictions for the 5.02 TeV Pb+Pb at LHC

The same suppression as at 2.76 TeV for all types of probes! 5.02 TeV Pb+Pb at LHC The same suppression as at 2.76 TeV for all types of probes! M. D. and M. Djordjevic, Phys. Rev. C 92 (2015) 2, 024918

The same suppression as at 2.76 TeV for all types of probes! 5.02 TeV Pb+Pb at LHC The same suppression as at 2.76 TeV for all types of probes! In line with BES energy scan, which shows similar suppressions between RHIC and LHC. M. D. and M. Djordjevic, Phys. Rev. C 92 (2015) 2, 024918

Why the same suppression? An interplay between initial distribution and energy loss effects. The two effects cancel! M. D. and M. Djordjevic, Phys. Rev. C 92 (2015) 2, 024918

Suppression patterns for heavy probes MD, arXiv:1512.00505 J/ b-jets Distinct RAA vs. Npart for light probes (flattening with increasing pt range). We predict: The same RAA vs. Npart for bottom probes (independently on the pt range). 26

MD, arXiv:1512.00505 Interplay between collisional, radiative energy loss and the dead-cone effect.

Energy loss summary Dynamical energy loss formalism. Tested on angular averaged RAA data Largely not sensitive to the medium evolution. Good agreement for wide range of probes, centralities and beam energies. Can explain puzzling data. Clear predictions for future experiments. The dynamical energy loss formalism can well explain the high pt parton-medium interactions in QGP.

+ Outlook Dynamical energy loss model Bulk medium evolution models (Huovinen/Niemi, BAMPS) Predictions of angular differential RAA observables (e.g. elliptic flow) for high pt observables. Presumably highly sensitive to the medium evolution. A new sophisticated tool for precision QGP tomography.

Backup

Good agreement at the low energy! What about jets? The dead cone effect pt~10GeV pt~100GeV Good agreement at the low energy! As well as for jets!

The model is in agreement with the jet data as well! At high momentum, all types of particles have the same suppression Good agreement between our model and the data The model is in agreement with the jet data as well!

Non central collisions @ LHC (fixed centrality and charged hadrons) M. D., M. Djordjevic and B. Blagojevic, PLB 737 298 (2014) An excellent agreement for different centrality regions!

Non central collisions @ RHIC (fixed centrality and neutral pions) Also a very good agreement for RHIC! M. D., M. Djordjevic and B. Blagojevic, PLB 737 298 (2014)