Probing ppb Collisions with Jets in CMS. Kurt Jung [ Purdue University ] for the CMS collabora?on
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1 Probing ppb Collisions with Jets in CMS Kurt Jung [ Purdue University ] for the CMS collabora?on Workshop on proton- lead nucleus collisions at the LHC, ECT*, Trento, Italy. May 6-, 203
2 Dijet Anatomy in HI Collisions QGP QGP? CGC? PbPb Collisions Clear signs of QGP dijet suppression observed in central collisions Jets are back-to-back in all centralities and are narrow in Δϕ ppb Collisions Can we understand the baseline for PbPb? Is there suppression? What do the η & ϕ distributions look like? 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 2
3 Dijet Anatomy in HI Collisions PLB 72 (202) 76 Dijet Suppression in central PbPb Leading Jet (p T > 20 GeV/c) - Dijet p T ra?o is suppressed in central PbPb events Subleading Jet (p T > 30 GeV/c) - Quan?fied by the ra?o of the subleading jet p T to the leading jet p T 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 3
4 Dijet Anatomy in HI Collisions PRC 84 (202) Leading Jet (p T > 20 GeV/c) Δϕ distribu?on in PbPb is back- to- back across all centrali?es Subleading Jet (p T > 30 GeV/c) More central dijets are unchanged with respect to the reference along the ϕ angle 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 4
5 Dijet Anatomy in HI Collisions Average η distribu?ons Leading Jet (p T > 20 GeV/c) Dijet <η> distribu?on in PbPb is gaussian, centered at zero (symmetric collision) Quan?fied by η dijet = (η + η 2 )/2 Subleading Jet (p T > 30 GeV/c) What can be expected for ppb? 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 5
6 ppb Kinema?cs Kinema?cs of the collision p+pb run asymmetrically <η dijet > less than 0 η dijet = (η + η 2 )/2 In the Lab Frame: Low x from Pb (.58 TeV/N) η +z Large x from p (4.0 TeV) Lab η 2 η dijet Asymmetric energies leads to <η dijet > less than 0 Asymmetric x leads to selec?on on nega?ve end of η dijet spectrum 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 6
7 Nuclear PDF LHC Q 2 = 0 GeV 2 C.A. Salgado, et. al. J.Phys. G39 (202) 050 R g Pb = npdf /PDF Nuclear Shadowing (gluon satura?on?) An?shadowing EMC deple?on region Even at LHC energies, the gluon R Pb is expected to have significant shadowing/an?shadowing effects Expect jet Q LHC ~ 3-4 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 7
8 Nuclear PDF LHC Kinema?c reach for CMS, s = 8.8 TeV (0. pb - ) Q 2 = 0 GeV 2 R g Pb = npdf /PDF C.A. Salgado, et. al. J.Phys. G39 (202) 050 Even at LHC energies, the gluon R Pb is expected to have significant shadowing/an?shadowing effects Expect jet Q LHC ~ 3-4 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 8
9 Dijet η and Nuclear Shadowing Kinema?cs of the collision p+pb run asymmetrically <η dijet > less than 0 η dijet = (η + η 2 )/2 In the Lab Frame: Low x from Pb (.58 TeV/N) η +z Large x from p (4.0 TeV) Lab η 2 η dijet Now if we add Nuclear Shadowing We expect suppression of low- x (Pb) collisions larger <η dijet > Low x from Pb (.58 TeV/N) η Large x from p (4.0 TeV) Lab (with shadowing) η 2 η dijet 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 9
10 Clarifica?on on Centrality Proxy Forward Calorimeters (HF) (3 η 5) Centrality is difficult to define in ppb, probably owing to the steepness of the N trk distribu?on Very small selec?on possibili?es for N coll [ ppb (0-20), PbPb (0-00) ] A small N trk window corresponds to a very large distribu?on 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203
11 Data & MC Samples ~½ of the 203 ppb dataset analyzed High- p T triggered Required jet > 0 GeV ppb reversed direc?on a er L = 8. nb - Embedded PYTHIA pp jet pairs into a HIJING ppb background pp dijets boosted to η= to account for na?ve collision asymmetry Also plo~ed the bare PYTHIA pp jets as a reference at inclusive centrality 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203
12 ppb Dijet p T Ra?os CMS Preliminary - ppb! L dt=8.48 nb (0-0)% p > 20 GeV/c T, p T,2 HF[ " >4] > 30 GeV/c < 20 GeV anti-k T (PFlow) R=0.3 &%,2 > 2$/3 20 GeV # HF[ " >4] < 25 GeV ppb s=5.02 TeV PYTHIA + HIJING HF[ " >4] 25 GeV # < 30 GeV HF[ " >4] 30 GeV # < 40 GeV HF[ " >4] ' 40 GeV PYTHIA Observe NO modifica?on to dijet p T ra?o up to > 40 GeV ( 0-2.5% centrality) p T,2 /p T, 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 2
13 ppb Dijet p T Ra?os > T, /p <p T, ppb, s NN =5.02 TeV PYTHIA+HIJING, s NN =5.02 TeV CMS Preliminary HF[! >4] ppb " - L dt=8.48 nb Observe NO modifica?on to dijet p T ra?o up to > 40 GeV ( 0-2.5% centrality) 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 3
14 CMS Preliminary - ppb! L dt=8.48 nb Dijet Δϕ Distribu?ons (0-0)% p T, p T,2 > 20 GeV/c > 30 GeV/c HF[ " >4] HF[ " >4] < 20 GeV GeV # E T < 25 GeV HF[ " >4] HF[ " >4] HF[ " >4] 25 GeV # < 30 GeV 30 GeV # < 40 GeV E -5 T & 40 GeV %$,2 Δϕ distribu?on is unchanged w.r.t. HF energy 5/8/3 Kurt Jung: ECT* Workshop, May 6-, anti-k T (PFlow) R=0.3 ppb s=5.02 TeV PYTHIA + HIJING PYTHIA
15 Dijet Δϕ Distribu?ons $(#") 0.26 p >20 GeV/c & p >30 GeV/c N dijet dn dijet dδφ,2 = e(δφ π )/σ ( e π /σ )σ T, T, HF[! >4] (GeV) Δϕ distribu?on is unchanged w.r.t. HF energy 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 5
16 Dijet η Distribu?ons p η dijet = (η + η 2 )/2 Pb CMS Preliminary - ppb! L dt=8.48 nb (0-0)% p > 20 GeV/c T, p T,2 > 30 GeV/c HF[ " >4] < 20 GeV anti-k T (PFlow) R=0.3 &%,2 > 2$/3 20 GeV # HF[ " >4] < 25 GeV ppb s=5.02 TeV HF[ " >4] 25 GeV # < 30 GeV HF[ " >4] 30 GeV # 0.2 < 40 GeV HF[ " >4] ' PYTHIA + HIJING PYTHIA 40 GeV! " dijet Dijet eta distribu?ons plo~ed against a PYTHIA reference We find a systema?c shi in the posi?ve η direc?on vs HF energy 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 6
17 Dijet η Distribu?ons p Pb > dijet <! -0.2 $# > (2"/3) , HF[! >4] (GeV) Dijet eta distribu?ons plo~ed against a PYTHIA reference We find a systema?c shi in the posi?ve η direc?on vs HF energy 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 7
18 Dijet η Distribu?ons p Pb ) dijet "(!.! < HF[! >4] (GeV) Dijet eta distribu?ons plo~ed against a PYTHIA reference We find a systema?c shi toward narrower η dijet distribu?ons vs HF 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 8
19 Dijet η Distribu?ons as Probe of Pb PDF? Event Frac?on An?- shadowing Region arxiv:5.399 Shadowing Regions EMC Regions *Qualita?ve comparison only!* Observe similar enhancement/suppression in dijet η as predicted for parton x 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 9
20 Ini?al Dijet Results p Pb Normalized to η > 0.43 Normalized to η < Overlay of all dijet η distribu?ons (normalized by area and area η>0) EMC deple?on region consistent with invariance as a func?on of centrality Shadowing region consistent with non- invariance vs centrality 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
21 Summary Δϕ constant vs HF ),2 $(#" CMS Preliminary - ppb % L dt=8.48 nb > T, /p T,2 <p anti-k T (PFlow) R=0.3 #",2 > 2&/3,! <3 p T ra@o is constant vs HF HF[! >4] (GeV) HF[! >4] (GeV) Dijet η shihs toward posi@ve direc@on vs HF energy > <! dijet p > 20 GeV/c T, p T,2 > 30 GeV/c ) $(! dijet ppb s NN =5.02 TeV PYTHIA + HIJING PYTHIA Dijet η gaussian widths become narrower vs HF HF[! >4] (GeV) HF[! >4] (GeV) 5/8/3 Kurt Jung: ECT* Workshop, May 6-, 203 2
22 Summary (2) PbPb Collisions ppb Collisions QGP QGP? CGC? Clear signs of QGP dijet suppression observed in central collisions Jets are back-to-back in all centralities and are narrow in Δϕ h~p://cds.cern.ch/record/54578?ln=en Can we understand the baseline for PbPb? w.r.t. suppression, yes. Other aspects more difficult (see talk by S. Tuo, Tuesday) Is there suppression? Dijet suppression consistent with MC What do the η & ϕ distributions look like? η distributions could reflect nuclear PDF modfications, ϕ distributions consistent with PbPb 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
23 BACKUP 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
24 HF Energy to <N trk > Public Physics Analysis Summary (PAS), Table - -2 CMS Simulation HIJING ppb s NN = 5.02 TeV (0-0)% (26.9-0)% ( )% ( )% ( )% (0-2.5)% HIJING simula?on of N part distribu?ons in centrality ranges corresponding to HF binning scheme N part 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
25 Semi- Quan?ta?ve Mapping (x,η dijet ) p x x 2 Pb Boosted PYTHIA 5.02 TeV Boosted PYTHIA 5.02 TeV 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
26 Fits to Δϕ Jet Distribu?ons Fit Func?on p0 = σ N dijet dn dijet dδφ,2 = e(δφ π )/σ ( e π /σ )σ ppb, s NN =5.02 TeV PYTHIA+HIJING PYTHIA pp anti-k T (PFlow) R=0.3 (0-0)% CMS Preliminary HF " >4 " <3 <20 GeV! 2 / ndf 6.75 / 8 Prob 2.3e- p ± p 0.5 ± HF " >4 20# <25 GeV ppb & - L dt=8.48 nb! 2 / ndf 5.2 / 8 Prob p ± p 0.52 ± p >20 GeV/c & p >30 GeV/c T, T,2 HF " >4 25# <30 GeV! 2 / ndf 4.8 / 8 Prob p ± p 0.5 ± HF " >4 HF " >4 E 30#E <40 GeV T '40 GeV T 2 2! / ndf 5.9 / 8! / ndf 20.5 / 8 - Prob Prob p ± p ± p 0.52 ± p 0.53 ± %$, /8/3 Kurt Jung: ECT* Workshop, May 6-,
27 Other Op?ons for Centrality Proxies 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
28 Energy in HF+ and HF- 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
29 Cross- checks on Dijet p T Thresholds > T, /p <p T, ppb s =5.02 TeV NN PYTHIA+HIJING Working Point CMS Preliminary Leading Jet p T Secondary Jet p T 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
30 Check with Resolu?on Smearing to MC (0-0)% ppb, s NN =5.02 TeV PYTHIA+HIJING PYTHIA pp anti-k T (PFlow) R=0.3 CMS Preliminary HF! >4 ppb # <20 GeV - L dt=8.48 nb HF! >4 20" <25 GeV p >20 GeV/c & p >30 GeV/c T, T,2 &% > (2$/3),2! < HF! >4 25" <30 GeV 0.25 HF! >4 30" <40 GeV 0.25 HF! >4 '40 GeV p /p T,2 T, 5/8/3 Kurt Jung: ECT* Workshop, May 6-,
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