Heavy Ion Collision Measurements at the LHC Using the CMS Detector
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1 Heavy Ion Collision Measurements at the LHC Using the CMS Detector David Krofcheck on behalf of the CMS Collaboration IAS-CERN Workshop, Singapore, March 26 th So, what happens at the LHC besides Higgs hunting?
2 p, K, p, n, f, L, D, X, W, d D. Krofcheck IAS-CERN Workshop, Singapore 2
3 The CMS Detector - Overall picture Muon Detectors < 2.5 Beam Scintillators (NZ) Pixel and Silicon-Strip Tracker Excellent momentum resolution Large acceptance < T Solenoid Hermetic calorimeter coverage ECAL + HCAL < 3.0 Forward HCAL 3.0 < 5.0 DAQ+Trigger: Dedicated triggers for Jets, Photons, Muon, high p T charged particles, etc. D. Krofcheck IAS-CERN Workshop, Singapore 3
4 Basic nuclear physics jargon as needed Probing the sqgp with the CMS highlights, too much to discuss! Dijets energy balance γ jet energy loss Electroweak probes (Z 0,W ± ), Quarkonia suppression Nuclear Modification Factors (R AA ) Particle correlations flow, dihadrons Basic Summary D. Krofcheck IAS-CERN Workshop, Singapore 4
5 The CMS Detector - single particle detection 4T D. Krofcheck IAS-CERN Workshop, Singapore 5
6 The CMS Detector - better than a cartoon
7 Measure the overlap of two ions or number of participating or colliding nucleons by measuring energy in forward calorimeters Energy in calorimeters is ~ to the number of participating nucleons in the overlap region (Glauber Model) Rate of high p T processes is ~ to the number of colliding pairs of quarks and gluons D. Krofcheck IAS-CERN Workshop, Singapore 7
8 What Pixel detectors and Forward calorimeters see peripheral central peripheral central D. Krofcheck IAS-CERN Workshop, Singapore 8
9 Jet production in pp collisions jet-jet correlation in QCD vacuum D. Krofcheck IAS-CERN Workshop, Singapore 9
10 Jet production in PbPb collisions jet-jet correlation in QCD medium γ jet correlation to probe the medium? D. Krofcheck IAS-CERN Workshop, Singapore 10
11 E-ΔΕ 1 Δφ Dijet imbalance in PbPb collisions E-ΔΕ 2 Phys. Rev. C 84, (2011) D. Krofcheck IAS-CERN Workshop, Singapore 11
12 Selecting jets in PbPb collisions Phys. Rev. C 84, (2011) peripheral central D. Krofcheck IAS-CERN Workshop, Singapore 12
13 Dijets in PbPb - asymmetry in central collisions PLB 712 (2012) 176 D. Krofcheck IAS-CERN Workshop, Singapore 13
14 Observed momentum imbalance in γ jet correlation Linar Boltzman Transport PLB 718 (2013) 773 elastic parton scattering induced gluon emission Wang&Zhu arxiv:
15 Observed deviation between γ jet from PbPb collisions Mean x J CMS Significant deviation of x J in PbPb compared to PYTHIA + HYDJET PLB 718 (2013) 773 Wang & Zhu arxiv: D. Krofcheck IAS-CERN Workshop, Singapore 15
16 Observed deviation between γ jet from PbPb collisions PLB 718 (2013) 773 Wang & Zhu arxiv: D. Krofcheck IAS-CERN Workshop, Singapore 16
17 Electroweak bosons passing through sqgp D. Krofcheck IAS-CERN Workshop, Singapore 17 PRL 106 (2011) PLB 715 (2012) 66
18 D. Krofcheck IAS-CERN Workshop, Singapore 18
19 PLB 710 (2012) 256 D. Krofcheck IAS-CERN Workshop, Singapore 19
20 D. Krofcheck IAS-CERN Workshop, Singapore 20
21 D. Krofcheck IAS-CERN Workshop, Singapore 21
22 D. Krofcheck IAS-CERN Workshop, Singapore 22
23 EPJC 72 (2012)1945 D. Krofcheck IAS-CERN Workshop, Singapore 23
24 Heavy Mesons as sqgp Thermometers D. Krofcheck IAS-CERN Workshop, Singapore 24
25 Upsilon ( ϒ ) excited state sequential melting D. Krofcheck IAS-CERN Workshop, Singapore 25
26 Dimuons detected in PbPb collisions with the CMS D. Krofcheck IAS-CERN Workshop, Singapore 26
27 PRL 109 (2012) D. Krofcheck IAS-CERN Workshop, Singapore 27
28 PRL 109 (2012) D. Krofcheck IAS-CERN Workshop, Singapore 28
29 D. Krofcheck IAS-CERN Workshop, Singapore 29
30 PRL 109 (2012) D. Krofcheck IAS-CERN Workshop, Singapore 30
31 D. Krofcheck IAS-CERN Workshop, Singapore 31
32 Azimuthal Anisotropy of particle emission D. Krofcheck IAS-CERN Workshop, Singapore 32
33 D. Krofcheck IAS-CERN Workshop, Singapore 33
34 D. Krofcheck IAS-CERN Workshop, Singapore 34
35 Azimuthal Anisotropy of particle emission PRC 87 (2013) Good agreement with ALICE, except in most peripheral events D. Krofcheck IAS-CERN Workshop, Singapore 35
36 Azimuthal Anisotropy of particle emission Path length dependent Energy loss at high P T PRC 87 (2013) D. Krofcheck IAS-CERN Workshop, Singapore 36
37 Di-hadron correlations: mountains, ridges, valleys Hooker Valley, Mt Cook National Park, New Zealand D. Krofcheck IAS-CERN Workshop, Singapore 37
38 p+p p+pb Pb+Pb JHEP (2011) 076 JHEP (2009) 091 PLB (2013) 795 D. Krofcheck IAS-CERN Workshop, Singapore 38
39 Summary In relativistic nucleus-nucleus collisions at the RHIC and the LHC sqgp Medium affects dijets and jets correlated with gamma/z 0 (gamma, Z and W particles appear to be unscathed) sqgp Medium suppresses particle cross sections (seen in R AA ) sqgp Medium melts early time probes (upsilon and J/psi) sqgp affects particle correlations ( ridges seen in pp, ppb and PbPb?) Need reference pp data for meaningful PbPb comparisons CMS HI group looking at many observables to describe sqgp D. Krofcheck IAS-CERN Workshop, Singapore 39
40 Backup slides
41 Summary We used dijets to compare PbPb collisions to pp at different impact parameters and transverse momenta Dijets can be strongly imbalanced in momentum as a result of passing through the QCD medium We observe γ jet correlations Measuring the γ and jet energies may tell us about the energy loss mechanism of in-medium partons. D. Krofcheck ICHEP, Melbourne Dijet Imbalance in 2.76 TeV PbPb Collisions 41
42
43
44 PLB 710 (2012) 256
45 CMS preliminary D. Krofcheck IAS-CERN Workshop, Singapore 45
46 Azimuthal Anisotropy of particle emission PRC 87 (2013) D. Krofcheck IAS-CERN Workshop, Singapore 46
47 Observed angular correlation between γ jet in PbPb collisions PLB 718 (2013) 773 No significant angular decorrelation is observed for -jet pairs γ jet Correlation across PbPb overlap D. Krofcheck IAS-CERN Workshop, Singapore 47
48 Observed angular correlation between the PbPb dijets D. Krofcheck IAS-CERN Workshop, Singapore 48
49 Dijets in PbPb are more imbalanced than PYTHIA+HYDJET Unbalanced Balanced D. Krofcheck IAS-CERN Workshop, Singapore 49
50
51 D. Krofcheck IAS-CERN Workshop, Singapore 51
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