Jet Medium Interactions
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1 Jet Medium Interactions Yasuki Tachibana Nishinippon Institute of Technology ( Central China Normal University) ATHIC 216, New Delhi, India, 19 February 216
2 Introduction
3 Jet energy loss in QGP medium Bjorken (1983), Gyulassy, Plumer (199), Gyulassy, Wang (1994),... hadrons }jet Jets in heavy-ion colls. - produced in initial hard scattering - propagating through QGP medium Strong interactions with QGP - Collisional energy loss elastic process hard scattering - Radiative energy loss inelastic process Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February 216 3
4 Jet quenching in heavy-ion collisions Jet nuclear modification factor R AA = d2 Njet AA/dpjet T d p pp jet /dpjet T d p ht AA id 2 RAA (nb/gev) 1 d 2 jet dp jet T d p Jet energy loss R AA < 1.5 Jet quenching (GeV) 4 Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February p jet T p jet T (GeV)
5 Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February Medium response to jet quenching Conventional calculation of jet evolution QGP fluid as a background thermal field (No back reaction) Energy and momentum are NOT conserved Energy-momentum deposition into medium Medium excitation by deposited energy and momentum jet
6 Hydrodynamic response to jet quenching QGP fluid Bjorken (1983), Space-time evolution of the bulk QGP Relativistic hydrodynamics Mach cone Stoecker ( 5), Casalderrey-Solana, Shuryak, Teaney ( 5), Shockwave front v M c s M = arcsin c s v, v > c s YT, Hirano ( 12) Energy-momentum transport in the QGP fluid Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February 216 6
7 Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February Influence of medium response Observables in events with large jet Low- p T enhancement away from the jets YT, Hirano ( 14) quenched jet Low pt particles Jet structure inside the jet cone (fragmentation function, transverse profile ) Wang, Zhu ( 13), He, Luo, Wang, Zhu ( 15), Casalderrey-Solana, Gülhan, Milhano, Pablos, Rajagopal ( 15) Influence of a large number of mini-jets Medium reheating Floerchinger, Zapp ( 14) Anisotropic flow (modification of v 2, v 3, ) Deformation of QGP medium Andrade, Noronha, Denicol ( 14), Schulc, Tomášik ( 14)
8 Mach cone in expanding QGP fluid YT and T. Hirano, arxiv:
9 Mach cone in expanding QGP fluid Purpose of this study YT and T. Hirano, arxiv: Hydrodynamic response to jet in expanding background - Consequent spectra of particles from medium Gamma-jet events in heavy-ion collisions Pair production of photon and parton One jet traveling through QGP fluid jet energy loss NO energy loss Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February 216 9
10 QGP fluid + jet model Energy and momentum incoming to the QGP fluid Hydrodynamic equations with source terms µt µ = J Energy-momentum tensor of the QGP fluid Energy and momentum deposited from the jet Assumption Instantaneous thermalization of deposited energy and momentum J µ (x) = dpµ jet dt (3) (x x jet (t)) - Hydrodynamic response to jet - Background expansion - Interplay between them Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February 216 1
11 Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February A jet traveling through the expanding QGP Gamma-jet events in central Pb-Pb collisions - (3+1)-D ideal hydro - Optical Glauber model, lattice EoS - Energy loss dp jet dt = T (x jet ) T 3 de dl de dl T = 5MeV = 15 GeV/fm Mach cone developing in the expanding medium e GeV/fm 3 e.g.) Jet produced at (x,y )=(3.fm, 3. fm)
12 Spectra after hydro evolution Increase of the particles from the medium dn ± dn ± = d d d d dn ± d d w/o jet (1 < pt < 2 GeV/c) Particles from jet fragmentation are not included.6 /d d = Azimuthal-angle distribution.4 y Event-averaged pt, jet > 8 GeV/c Single event xt, jet( = ) = (3 fm, 3 fm) x dn ± xt = (3 fm, 3 fm) /2 /2 3 /2 Interplay between the Mach cone and the radial flow Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February
13 Constraint on the jet path Trigger for photon Off-central path Dip Extract small energy-loss events Jet production point distribution y y fm No trigger for photon p T,jet 8GeV/c x fm Event Fraction y fm x fm Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February p T, GeV/c p T,jet 1-11 GeV/c Event Fraction x
14 Constraint on the jet path y Azimuthal-angle distribution for small energy-loss events dn ± /d d =.4.3 y fm a) pt, jet 1-11 GeV/c pt, GeV/c a) pt, jet 1-11 GeV/c b) pt, jet GeV/c x fm.2 b) pt, jet GeV/c.1 /2 /2 3 /2 Interplay between the Mach cone and the radial flow y fm -.1 x x fm Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February
15 Summary and Outlook
16 Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February Summary Jet quenching in heavy ion collisions Medium response to jet quenching - Influence on many observables Mach cone in expanding QGP fluid - Hydrodynamic eq. with source term - Suppression due to the push back by Mach cone Direct signal of the Mach cone Information about the jet path in the medium Constraint on the jet path Trigger also for photon in gamma-jet events
17 Outlook Full jet energy deposition - Parton shower w/ initial fluctuation small angle gluon radiation large angle gluon radiation partons in jet Leading parton Leading parton - Thermalization process How do deposited energy and momentum thermalize and diffuse in medium? Yasuki Tachibana, ATHIC 216, New Delhi, India, 19 February
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