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Gunther RolandQuark Matter 2012, Washington DC 1 Highlights from CMS Gunther Roland (MIT) for the CMS Collaboration Quark Matter conference, Washington.

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Presentation on theme: "Gunther RolandQuark Matter 2012, Washington DC 1 Highlights from CMS Gunther Roland (MIT) for the CMS Collaboration Quark Matter conference, Washington."— Presentation transcript:

1 Gunther RolandQuark Matter 2012, Washington DC 1 Highlights from CMS Gunther Roland (MIT) for the CMS Collaboration Quark Matter conference, Washington DC Aug 13 th, 2012

2 Gunther RolandQuark Matter 2012, Washington DC 2 CMS excels at -Resolution of tracking and calorimetry -Trigger selectivity over a large range in rapidity and full azimuth CMS experiment arXiv:1207.7235 Accepted by PLB

3 Gunther RolandQuark Matter 2012, Washington DC CMS heavy-ion papers 3 18 published/submitted papers, 10 Physics Analysis Summaries (CMS PAS): https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsHIN

4 Gunther RolandQuark Matter 2012, Washington DC CMS highlights in five acts i.A bigger bang Ultra-central collisions ii.A classicist view of jet quenching The R AA zoo iii.A new kind of PID Parton ID, not particle ID iv.Anatomy of a jet Jet shapes and fragmentation functions v.Lost and bound Debye-screening and recombination 4

5 Gunther RolandQuark Matter 2012, Washington DC 5 A bigger bang Nuclear stopping Transverse energy  0 elliptic flow Ultra-central collisions UCC trigger:1.8M most central events out of 1B Parallel talks: Magdalena Malek, dE T /d  (Wed) Hauke Woehrmann Energy flow (Wed) Parallel talks: Rylan Conway High p T correlations (Tue) Shenquan Tuo Bulk v n (Fri) Eric Appelt Bulk v 2 (Fri) CMS-PAS HIN-12-006 arXiv:1205.2488 See arXiv this evening

6 Gunther RolandQuark Matter 2012, Washington DC Ultra-central collisions 6 0.2% most central Participant distribution relative to the n th order participant plane n th order eccentricities vs b  2 -  5 converge in ultra-central collisions b<2fm    n=2 n=3 n=4 n=5 n=6

7 Gunther RolandQuark Matter 2012, Washington DC Ultra-central collisions 7 Calculation by Luzum et al.Calculation by Heinz et al. Unique perspective on hydrodynamic flow Hierarchy of coefficients reproduced by hydro Some tension between v 2 and v 3..7 CMS-PAS HIN-12-011 Poster: Wei Li Note, AMPT 0-0.2%: = 1.6fm, RMS(b) = 0.6fm v2v2 v3v3 v4v4 v5v5 v6v6 v7v7 Parallel talk Shenquan Tuo

8 Gunther RolandQuark Matter 2012, Washington DC Anisotropy at high p T 8 v 2 persists to p T > 40GeV Pathlength-dependent energy loss v 3 vanishes for p T > 20 GeV Weaker correlation of pathlength and  3 plane PRL 109 (2012) 022301 CMS-PAS HIN-12-010 Parallel talks Rylan Conway(Tue) Victoria Zhukova (Tue)

9 Gunther RolandQuark Matter 2012, Washington DC A classicist view of jet quenching 9 R AA remains a critical tool in the study of parton energy loss The CMS R AA Zoo (QM’11) Fate of charged hadron R AA for p T > 60GeV?

10 Gunther RolandQuark Matter 2012, Washington DC A classicist view of jet quenching 10 Start from blank slate Repopulate R AA Zoo with new analyses (since QM’11)

11 Gunther RolandQuark Matter 2012, Washington DC 11 (Non-) Suppression of colorless probes N coll scaling confirmed W  using single muon recoil against missing p T Z 0     arXiv:1205.6334 CMS-PAS HIN-12-008 Isolated photon R AA with 2.76 TeV pp reference Parallel talk Lamia Benhabib (Wed) arXiv:1205.6334 Accepted by PLB PLB 710 (2012) 256 Parallel talk George Stephans (Wed)

12 Gunther RolandQuark Matter 2012, Washington DC 12 Added full 2011 jet-triggered data set to charged hadron R AA measurement Charged hadron R AA flat from p T = 30 - 100GeV Suppression of charged particles EPJC 72 (2012) 1945

13 Gunther RolandQuark Matter 2012, Washington DC Suppression of inclusive jets 13 Like for charged particles, high-p T jet R AA flat at ≈ 0.5 Fully unfolded inclusive jet R AA pp 2.76 TeV reference CMS-PAS HIN-12-004

14 Gunther RolandQuark Matter 2012, Washington DC A new kind of PID 14 p T > 80GeV: Jet + high mass secondary vertex Obtain b-jet fraction CMS-PAS HIN-12-003 6.5 < p T < 30 GeV: Displaced J/ψ  Obtain B R AA CMS-PAS HIN-12-014 Parton ID, not particle ID: b-quark quenching

15 Gunther RolandQuark Matter 2012, Washington DC Parton ID: b-quarks 15 Distinct b-quark suppression pattern at low p T First observation of b-jet suppression at high p T Parallel talk Mihee Jo (Fri) Parallel talk Matt Nguyen (Tue) Poster Jorge Robles

16 Gunther RolandQuark Matter 2012, Washington DC  +jet: u,d quark energy loss 16 Photon tag: Identifies jet as u,d quark jet Provides initial quark direction Provides initial quark p T Jet (98 GeV) Photon (191GeV)

17 Gunther RolandQuark Matter 2012, Washington DC  +jet: u,d quark energy loss 17 Photon-jet momentum balance PbPb Pythia+Hydjet Area normalized to unity Pythia+Hydjet 0-10% Area normalized to unity arXiv:1205.0206 Parallel talk Yue Shi Lai (Tue) arXiv:1205.0206

18 Gunther RolandQuark Matter 2012, Washington DC  +jet: u,d quark energy loss 18 20% of photons lose jet partner PbPb Pythia+Hydjet pp Pythia+Hydjet Jet-photon p T balance drops by 14% PbPb Pythia+Hydjet 0-10% Area normalized to unity Photon-jet momentum balance arXiv:1205.0206 Parallel talk Yue Shi Lai (Tue) arXiv:1205.0206

19 Gunther RolandQuark Matter 2012, Washington DC Anatomy of a jet 19 PYTHIA 100 GeV inclusive jet Anti-k T R=0.3 jet Charged particle energy fraction 95% of energy in p T > 4 GeV particles 95% of energy in r < 0.2 Is the jet energy in PbPb redistributed in radius: Differential jet-shapes Is the jet energy in PbPb redistributed in particle p T : Fragmentation functions Radius r

20 Gunther RolandQuark Matter 2012, Washington DC Anatomy of a jet 20 Ratio of PbPb/pp differential jet shapes Ratio of PbPb/pp fragmentation functions CMS-PAS HIN-12-013 Poster Yaxian Mao Parallel talk Frank Ma (Wed) z = p T (track)/p T (jet) low p T Parallel talk Pelin Kurt (Wed) No medium effect highp T

21 Gunther RolandQuark Matter 2012, Washington DC A consistent view of jet quenching 21 Consistent with 2010 result Recall (2010 vs 2011): Track p T > 4 GeV vs p T > 1 GeV Leading vs inclusive jet 0-30% vs 0-10% and 10-30% 2010 data: arXiv:1205.5872 arXiv:1205.5872 Change from “ξ” to “p T ” PbPb – pp (1/GeV) Broadening/excess at large r, low p T (~2% of jet energy) Narrowing/depletion at intermediate r, p T No change at small r, high p T Radius r

22 Gunther RolandQuark Matter 2012, Washington DC A consistent view of jet quenching 22 Charged particles from p T =50-100 GeV: z = p T (track)/p T (jet) = 0.4-0.6  < 1 Looking at the same parton p T range Consistent message from charged hadron R AA, inclusive jet R AA and fragmentation functions! PbPb fragmentation function = pp for ξ <1

23 Gunther RolandQuark Matter 2012, Washington DC Dimuons: Lost and bound 23 QM’13 Dongho Moon Tuesday Mihee Jo Friday Guillermo Breto Tuesday Lamia Benhabib Wednesday

24 Gunther RolandQuark Matter 2012, Washington DC 24 Sequential Upsilon suppression 2010 data2011 data Observation of sequential suppression of Y family Detailed studies PRL 107 (2011) 052302 Indication of suppression of (Y(2S)+Y(3S)) relative to Y(1S) 2.4  significance PRL 107 (2011) 052302

25 Gunther RolandQuark Matter 2012, Washington DC 25 Building a quarkonium-thermometer Clear hierarchy in R AA of different quarkonium states CMS-PAS HIN-11-011 N part CMS-PAS HIN-12-014, HIN-12-007 Expected in terms of binding energy Note: 6.5<p T <30 GeV for J/  and  (2s)

26 Gunther RolandQuark Matter 2012, Washington DC 26 Lost and bound: J/  vs  (2S) Indication that loosely bound  (2S) less suppressed than more tightly bound J/  for p T > 3GeV not more than 2  significance, limited by pp statistics PbPb fit PbPb (p T > 3GeV) CMS-PAS HIN-12-007 pp (p T > 3GeV)

27 Gunther RolandQuark Matter 2012, Washington DC 27 Summary Rich harvest of new data and results since QM ’11 Highlights include: –Flow harmonics in ultra-central collisions –v 2 and v 3 for p T of 40-60GeV –Nuclear modification factors , Z 0, W, charged hadrons, jets, b-tagged jets, B  J/  –First results on  -jet correlations –Detailed studies of jet fragmentation –Observation of sequential melting of the Y family and indications of un-melting of  (2S) Enjoy the excellent presentations our young colleagues have prepared!

28 Gunther RolandQuark Matter 2012, Washington DC 28 QM ‘12 talks from CMS Mon 12:25pm, Gunther Roland, Experimental highlights Mon 5:15pm, Stephen Sanders, Overview of results on flow and correlations Tue 9:30am, Gabor Veres, Overview of results on jets Tue 2:15pm, Yue Shi Lai, Study of jet quenching using photon-jet events in PbPb collisions Tue 2:15pm, Dongho Moon, Detailed measurements of charmonium suppression in PbPb collisions Tue 3:15pm, Rylan Conway, Short- and long-range very-high-p T triggered dihadron correlations in PbPb collisions Tue 3:55pm, Victoria Zhukova, Azimuthal anisotropy of charged hadrons at very high p T in PbPb collisions Tue 4:45pm, Matthew Nguyen, Studies of jet quenching and b-jet tagging in PbPb collisions Tue 4:45pm, Guillermo Rangel, Detailed measurements of bottomonium suppression in PbPb collisions Tue 5:25pm, Marguerite Tonjes, Inclusive jet and charged hadron nuclear modification factors in PbPb collisions Tue 5:45pm, Magdalena Malek, Pseudorapidity and centrality dependence of transverse energy flow in PbPb collisions Wed 8:30am, Hauke Wohrmann, Studies of the nuclear stopping power in PbPb collisions Wed 9:10am, Pelin Kurt, Jet shapes in pp and PbPb collisions Wed 9:50am, Frank Ma, Jet fragmentation functions in PbPb and pp collisions Wed 11:20am, George Stephans, Inclusive isolated photons in pp and PbPb collisions Wed 12:00pm, Lamia Benhabib, Jet shapes in pp and PbPb collisions Thu 9:45am, Raphael Granier de C., Overview of results on photon and electroweak boson production Thu 11:05am, Camelia Mironov, Overview of results on heavy flavor and quarkonia Fri 2:20pm, Eric Appelt, Elliptic azimuthal anisotropy of charged hadrons and neutral pions in PbPb collisions Fri 3:40pm, Mihee Jo, Suppression of open bottom at high p T via non-prompt J/psi decays in PbPb collisions Fri 5:30pm, Shengquan Tuo, Studies of higher-order flow harmonics and factorization of dihadron correlations in PbPb collisions

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