Learning about the QGP using Jets

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1 Learning about the QGP using Jets Raghav Kunnawalkam Elayavalli (Rutgers University) Nuclear Physics Seminar Oct 31st

2 What are we trying to study? 2

3 3

4 Jets! 4

5 Why Jets? e+ e- collisions first verification of quarks, gluons and confinement Dasgupta, CTEQ school lectures Experimentally -> Proxy for individual partons Now for pp, the picture is a bit different 5

6 6

7 what is the effect of the QGP? 7

8 What are we after? Characterize jet structure Experimental insights De-convolute physics from multiple observables 8

9 why make it complicated? Almost - due to surface and triggering biases 9

10 (simple) question: How does the QGP change the structure of jets? (simple) answer: Depends on knowing the exact mechanism of energy loss. For which we need insights from experiments NOTE: This is only a fraction of many many observables from RHIC and LHC during the past decade and more 10

11 Null Hypothesis Geometric scaling of pp collisions Insights from Run1: Jet R AA Jets are quenched as they travel through the QGP 1.4 Phys.Rev.Lett. 114 (2015) no.7, pp 5.43 pb + PbPb 166 µb (2.76 TeV) 30-50% CMS 1 Phys.Lett. B746 (2015) 1-14 R AA % Jet p T [GeV/c] 0-5% R AA CMS R AA R AA CMS Jet p T [GeV/c] Jet p T [GeV/c] Jet p T [GeV/c] 11

12 Either energy loss or suppression arb units Energy Loss Suppression Jet pt [GeV/c] Simple modeling works :) hides a lot of physics in the ratio 12

13 essentially this is what we are seeing when we calculate the RAA > in heavy ion collisions Need to make sharper and clearer understand the finer details 13

14 Hopefully we can resolve the beauty hidden inside 14

15 Jet Shape modification? Insights from Run1: Jet Shapes PLB (2014) 730, 243 Jets are broader and hold larger fraction of small p T particles around their edges Phys.Lett. B730 (2014) 243 Broader jet shapes in PbPb in most central collisions : Enhancement of low p T particles 15

16 Any internal structure modifications? New insights from Run2: Splitting functions Jets split more asymmetrically in PbPb vs pp, but vanishes at high pt! Probing the first hardest splitting z g (splitting function) : z cut = 0.1, β= 0 CMS-PAS-HIN CMS-HIN

17 data gave us insights MC studies can turn that into physics and hopefully phenomenology for the future 17

18 My time with the CERN theory department working on JEWEL 18

19 NOT THIS JEWEL Jewel Kilcher (born May 23, 1974) is an American singersongwriter, guitarist, producer, actress, author, and poet. S h e h a s r e c e i v e d f o u r Grammy Award nominations and, as of 2008, has sold over 30 million albums worldwide. 19

20 Jet Evolution With Energy Loss Korinna Zapp, Eur.Phys.J. C74 (2014)

21 Structure of JEWEL PYTHIA6 hard scattering JEWEL Final state shower PYTHIA6 Hadronization 21

22 Radiation in JEWEL Virtuality ordered parton shower Formation time for every gluon emitted In case of competing time, the shorter time one gets realized Elastic/inelastic scattering from the scattering centers At most one emission from ISR for medium scattering KCZ, et. al : JHEP 03 (2013) 080, EPJC72, 2012, 2028 arxiv: [hep-ph], arxiv: [hep-ph] 22

23 Algorithm in MC 1. create gluon in inelastic process 2. check if scattering during t f 3. If no gluon is formed Back to 1 4. If yes: scattering after time Δt < t f, re-evaluate formation time and back to 2 KCZ et. al : JHEP 03 (2013) 080, EPJC72, 2012, 2028 arxiv: [hep-ph], arxiv: [hep-ph] 23

24 Medium response in JEWEL Treatment of Recoils Scattering centers drawn from a thermal distribution Scattering centers realized from the interaction of the high energy parton propagating through the medium w/ Recoils, as soon as interaction happens and a gluon is emitted, it is stored in the event record. Marco, HP2015 KCZ et. al : JHEP 03 (2013)

25 Decent description of several jet phenomenon: 1) ALICE RAA 2) ATLAS fragmentation function 3) CMS Dijet asymmetry results KCZ EPJ C, Volume 74, Issue 2,

26 Any tuning? Is there tuning involved? Parameters 2.76 TeV 5.02 TeV Initial Temperature 485 MeV 590 MeV Formation time 0.6 fm 0.4 fm Inelastic cross section Debye Mass factor 64 mb 72 mb Now on to some observables and comparisons with data 26

27 Standard Candles in HIN collisions 27

28 V+Jet in JEWEL (NEW!) We add the following processes to JEWEL. details available in RKE, KCZ (accepted by EPJC) 28

29 So what are some of the observables in boson+jet Momentum fraction: xjz = pt Jet / pt Z Azimuthal shift (acoplanarity) ΔφJet, Z 29

30 γ + Jets 2.76 TeV (CMS-PAS-HIN ) and 5 TeV predictions! pp PbPb 0-30% PbPb % 30

31 Z + Jets 5.02 TeV preliminary CMS-PAS-HIN PbPb 0-30% 31

32 Good description so far! Now lets move towards observables that are sensitive to jet-medium interactions 32

33 Can JEWEL help us build this picture? pp collisions HIN collisions?? 33

34 What is the background in JEWEL? Using the scattering centers NEW version of JEWEL!! Will be public soon! Event Map Jets Scattering centers Map p T [GeV/c] p T [GeV/c] RKE, KCZ arxiv: , 1611.##### Scattering center in the Jets 34

35 Background subtraction in JEWEL RKE, KCZ arxiv: , 1611.##### 35

36 Jet Shape modification? Insights from Run1: Jet Shapes PLB (2014) 730, 243 Jets are broader and hold larger fraction of small p T particles around their edges Phys.Lett. B730 (2014) 243 Broader jet shapes in PbPb in most central collisions : Enhancement of low p T particles 36

37 Differential Jet Shapes Very good description of trend in data Matches the collisional and radiative energy loss picture First MC capable of describing jet shape modification ρ(r) PbPb /ρ(r) pp JEWEL+PYTHIA PbPb (0 10%) s =2.76 TeV ρ w/ tracks ρ w/ all particles CMS anti k T R=0.3, η < 2 Jet p T > 100 GeV/c r from Jet axis RKE, KCZ arxiv: , 1611.##### 37

38 In-Medium Splitting modification? zg (groomed shared momentum fraction) : JHEP 1405 (2014) 146 zcut = 0.1, β= 0 Modifications to subjet splitting in the HIN environment: what can we expect? 38

39 Any internal structure modifications? New insights from Run2: Splitting functions Jets split more asymmetrically in PbPb vs pp, but vanishes at high pt! Probing the first hardest splitting z g (splitting function) : z cut = 0.1, β= 0 CMS-PAS-HIN CMS-HIN

40 JEWEL does a good job! RKE, KCZ arxiv: , 1611.##### 40

41 qualitative picture of jets pp collisions HIN collisions 41

42 What have we learnt by studying jet structure Jets lose energy RAA hides interesting details! Increase in softer fragments in jets - clear Medium induces some splitting, how/where exactly needs to be identified! Studying jet modifications gives us a tomographical picture of the QGP 42

43 From recent jet workshop Guilherme Milhano, Oct 29th,

44 Bonus slides 44

45 Guilherme Milhano, Oct 29th, 2016

46 How do jets fragment? Insights from Run1: Fragmentation functions Low p T enhancement! High pt suppression! z = p track / p jet Tracks inside a jet cone of R=0.3 Phys.Rev. C90 (2014) no.2, High p T no modification Suppression of intermediate p T in the cone Enhancement at low p T 46

47 Who is carrying the lost energy? Insights from Run1: Missing pt ( and its recovery!) Quenched jet energy is recovered, by small momenta objects at large angles from the jet axis JHEP 1601 (2016)

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