Probing the QGP time structure from large to small(er) systems with - PowerPoint PPT Presentation

Probing the QGP time structure from large to small(er) systems with top quarks Liliana Apolinário Guilherme Milhano, Carlos Salgado and Gavin Salam Based on: arXiv:1711.03105 and arXiv: 1812.06772 (HE-LHC WG5) February 2019 COST Workshop on Interplay of hard and soft QCD probes for collectivity in HIC, Lund, Sweden

Introduction Probing of the QGP in heavy-ion collisions through a range of complementary probes: ✦ Jets, Quarkonia, Hydrodynamical Flow coefficients, Hadrochemistry,… ✦ All of them are the integrated result over the whole medium evolution ✦ L. Apolinário � 2 COST THOR Workshop

Introduction Probing of the QGP in heavy-ion collisions through a range of complementary probes: ✦ Jets, Quarkonia, Hydrodynamical Flow coefficients, Hadrochemistry,… ✦ All of them are the integrated result over the whole medium evolution ✦ However… Strong time-dependence of the medium properties (expansion and cooling of the system) L. Apolinário � 2 COST THOR Workshop

Introduction Probing of the QGP in heavy-ion collisions through a range of complementary probes: ✦ Jets, Quarkonia, Hydrodynamical Flow coefficients, Hadrochemistry,… ✦ All of them are the integrated result over the whole medium evolution ✦ However… Strong time-dependence of the Small-size systems (high-multiplicity medium properties (expansion and pp and pA collisions) show signatures cooling of the system) of collective behaviour L. Apolinário � 2 COST THOR Workshop

Introduction Probing of the QGP in heavy-ion collisions through a range of complementary probes: ✦ Jets, Quarkonia, Hydrodynamical Flow coefficients, Hadrochemistry,… ✦ All of them are the integrated result over the whole medium evolution ✦ However… Strong time-dependence of the Small-size systems (high-multiplicity medium properties (expansion and pp and pA collisions) show signatures cooling of the system) of collective behaviour Need to devise a strategy to probe the time-structure of the QGP! L. Apolinário � 2 COST THOR Workshop

Jet Quenching ✦ Jet Quenching probes so far: Dijets, Z+jet, ɣ+jet, … r q a b q QGP ✦ Produced simultaneously with the collision; W ✦ Our suggestion: t+tbar events b ✦ Leptonic decay: tagging; t ✦ Hadronic decay: probe of the medium r a b t ✦ Decay chain: top + W boson W μ ✦ At rest: 𝛖 top = 0.15 fm/c; 𝛖 W = 0.10 fm/c r a b b ν ➡ Originated jets will interact with the medium at later times L. Apolinário � 3 COST THOR Workshop

Jet Quenching Closer look to q+qbar antenna… ✦ Jet Quenching probes so far: Dijets, Z+jet, ɣ+jet, … r q a b q QGP ✦ Produced simultaneously with the collision; W ✦ Our suggestion: t+tbar events b ✦ Leptonic decay: tagging; t ✦ Hadronic decay: probe of the medium r a b t ✦ Decay chain: top + W boson W μ ✦ At rest: 𝛖 top = 0.15 fm/c; 𝛖 W = 0.10 fm/c r a b b ν ➡ Originated jets will interact with the medium at later times L. Apolinário � 3 COST THOR Workshop

Color Coherence ✦ Moreover, W boson hadronic decay is the natural setup to study coherence effects: Saturation Q s ~ θ qq L Q s < θ qq L scale: Q 2 q L s = ˆ Transport coefficient: Medium “sees” both particles as q ˆ Medium able to “see” both particles Medium one single emitter Color correlation is broken length: L Particles emit coherently Both particles emit independently ✦ Increases even more the time delay allowing to have a complete mapping of the QGP evolution: ✓ 12 ◆ 1 / 3 ✦ Stay in colourless singlet state during: t d = q θ 2 ˆ Mehtar-Tani, Salgado, Tywoniuk (2010-2011) q ¯ q Casalderrey-Solana, Iancu (2011) L. Apolinário � 4 COST THOR Workshop

<latexit sha1_base64="w3nyvy19iKDhfDqMyc51kc3pjks=">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</latexit> <latexit sha1_base64="w3nyvy19iKDhfDqMyc51kc3pjks=">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</latexit> <latexit sha1_base64="w3nyvy19iKDhfDqMyc51kc3pjks=">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</latexit> Time Delayed Probes ✦ Total delay time as a function of the top p T : 6 Transverse boost factor - + t t W W b b → (top and W): 2 -1 Total delay time and std. dev ( q = 4 GeV fm ) 5 Coherence Time ! 1 p 2 2 W decay Time t,X γ t,X = + 1 Top decay Time 4 m 2 > (fm/c) 2 -1 Total delay time ( q = 1 GeV fm ) X 3 tot τ < Coherence time 2 (q - qbar antenna): 1 ✓ 12 ◆ 1 / 3 t d = 0 q θ 2 ˆ 0 100 200 300 400 500 600 700 800 900 1000 q ¯ q reco p (GeV) t,top L. Apolinário � 5 COST THOR Workshop

<latexit sha1_base64="w3nyvy19iKDhfDqMyc51kc3pjks=">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</latexit> <latexit sha1_base64="w3nyvy19iKDhfDqMyc51kc3pjks=">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</latexit> <latexit sha1_base64="w3nyvy19iKDhfDqMyc51kc3pjks=">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</latexit> Time Delayed Probes q ✦ Total delay time as a function of the top p T : Low p t,topreco W qbar 6 Transverse boost factor t - + t t W W b b → b (top and W): 2 -1 Total delay time and std. dev ( q = 4 GeV fm ) 5 < 𝛖 tot > Coherence Time ! 1 p 2 2 W decay Time t,X γ t,X = + 1 Top decay Time 4 m 2 > (fm/c) QGP 2 -1 Total delay time ( q = 1 GeV fm ) X 3 tot τ < Coherence time 2 (q - qbar antenna): 1 ✓ 12 ◆ 1 / 3 t d = 0 q θ 2 ˆ 0 100 200 300 400 500 600 700 800 900 1000 q ¯ q reco p (GeV) t,top Time (fm/c) L. Apolinário � 5 COST THOR Workshop