1. M. Djordjevic 1 Heavy flavor suppression in a dynamical medium with finite magnetic mass Magdalena Djordjevic Institute of Physics Belgrade, University of Belgrade

2. M. Djordjevic 2 Overview Brief review of the dynamical energy loss Contribution to the energy loss due to longitudinally (electric) and transversely (magnetic) polarized gluons Introduction of finite magnetic mass Addressing heavy hlavor puzzle at RHIC Suppression predictions at the LHC

3. M. Djordjevic 3 Heavy flavour suppression Heavy (charm and beauty, M>1 GeV) flavour suppression is considered an excellent tool to study the properties of QGP. High pt suppression is a consequence of the energy loss. Reliable computations of energy loss mechanisms are needed.

4. We developed the radiative jet energy loss formalism in a finite size dynamical QCD medium. M. D., Phys.Rev.C80:064909,2009. M. D. and U. Heinz, Phys.Rev.Lett.101:022302,2008. Dynamical energy loss We computed the jet radiative energy loss in dynamical medium of thermally distributed massless quarks and gluons. Abolishes approximation of static scatterers.

5. M. Djordjevic 5 Dynamical v.s. static radiative energy loss 60% The energy loss in dynamical QCD medium is significantly larger than in static QCD medium. What is the origin of this increase?

6. M. Djordjevic 6 electric contribution magnetic contribution In dynamical medium both electric and magnetic contributions from the exchanged gluons contribute to the energy loss. Dynamical mediumStatic medium In static medium only electric contribution from the exchanged gluon contribute to the energy loss. electric contribution M.D.,J.Phys.G39:045007,2012

7. 7 Magnetic v.s. electric contribution? Additional magnetic contibution is the reason for a significant increase of the radiative energy loss in dynamical medium. Electric and magnetic contributions to the energy loss are comparable in dynamical QCD medium M.D.,J.Phys.G39:045007,2012

8. M. Djordjevic 8 The dynamical energy loss formalism is based on HTL perturbative QCD, which requires zero magnetic mass. Finite magnetic mass? However, different non-perturbative approaches suggest a non-zero magnetic mass at RHIC and LHC. Can magnetic mass be consistently included in the dynamical energy loss calculations? Magnetic contribution to the energy loss depends on magnetic mass. How this inclusion would modify the energy loss results?

9. M. Djordjevic 9 Generalization of radiative jet energy loss to finite magnetic mass M.D. and M. Djordjevic, Phys.Lett.B709:229,2012 zero magnetic mass From our analysis, only this part gets modified. Finite magnetic mass:

10. 10 A simple constraint on the magnetic mass If magnetic mass is larger than electric mass, the quark jet would, overall, start to gain (instead of lose) energy in this type of plasma. An apparent violation of the second law of thermodynamics. It is impossible to observe a plasma with magnetic mass larger than electric Various non-perturbative approaches suggest that, at RHIC and LHC, 0.4 < μ M /μ E < 0.6. M.D. and M. Djordjevic, Phys.Lett.B709:229,2012

11. M. Djordjevic 11 Finite magnetic mass effect Finite magnetic mass reduces the energy loss in dynamical QCD medium for 25% to 50%. CHARM

12. M. Djordjevic 12 Suppression at RHIC and LHC The numerical procedure includes: Both collisional and radiative energy loss from the newly developed (dynamical QCD medium) formalism Magnetic mass effects Multi-gluon fluctuations, i.e. the fact that energy loss is a distribution Path length fluctuations, i.e. the fact that particles travel different paths in the medium. M.D.,Phys.Rev.C85:034904,2012

13. D and B meson suppression at 200GeV Au+Au collisions at RHIC FONLL initial c and b pt disctributions Momentum discributions: W – S. Wicks, W. Horowitz,M.D.,M.Gyulassy,Nucl.Phys.A784:426,2007. D – A. Dainese,Eur.Phys.J.C33:495,2004. M. Djordjevic 13 M.D.,Phys.Rev.C85:034904,2012

14. 14 Pion and single electron suppressions at 200GeV Au+Au collisions at RHIC M.D.,Phys.Rev.C85:034904,2012

15. D and B suppression at 2.76TeV Pb+Pb collisions at LHC FONLL initial c and b pt discributions 15

16. M. Djordjevic 16 Summary Dynamical energy loss formalism abolishes the approximation of static QCD medium. We extended the dynamical energy loss formalism to the finite magnetic mass. The extension suggests a limit on the magnetic to electric mass ratio. Dynamical QCD medium together with the finite magnetic mass was incorporated in the numerical procedure for suppression predictions. The predictions for RHIC and LHC indicate a reasonable agreement of the dynamical energy loss formalism with the available data.

17. Support Ministry of Science and Education in Serbia FP7 Marie Curie International Reintegration grant L’Oreal UNESCO For Women in Science Serbia