winter workshop on nuclear dynamics, 2007 1 heavy ion physics with cms: day-one measurements olga...
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![Page 1: Winter Workshop on Nuclear Dynamics, 2007 1 Heavy Ion Physics with CMS: Day-One Measurements Olga Barannikova for the CMS Collaboration](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d3e5503460f94a16aba/html5/thumbnails/1.jpg)
Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 1
Heavy Ion Physics with CMS:Day-One Measurements
Olga Barannikovafor the
CMS Collaboration
![Page 2: Winter Workshop on Nuclear Dynamics, 2007 1 Heavy Ion Physics with CMS: Day-One Measurements Olga Barannikova for the CMS Collaboration](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d3e5503460f94a16aba/html5/thumbnails/2.jpg)
Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 2
Outline
CMS Detector Components, Acceptance, Capabilities
Heavy Ion Program in CMSTriggering
Advantages of HLT
Day-One physics expectations Low-pT tracking PID Capabilities
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 3
CASTORCASTOR
T2T2
Collar Collar shieldingshielding
Forward DetectorsForward Detectors
(5.2 < < 6.5)
TOTEMTOTEM
ZDCZDC
(5.3 < < 6.7)
(z = 140 m)
BeamsBeams
EMEM
HADHAD
The CMS Detector
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 4
4T Field
Particle Detection in CMS
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 5
Heavy Ion Events in CMS
Pb+Pb event display: Produced in full software framework (simulation, data structures, visualization)
Pb+Pb event (dN/dy = 3500) with -
Pixels InnerStrips
OuterStrips
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 6
From RHIC to LHC
Factor 30 increase in energy to √sNN=5.5 TeV Gluon Saturation – even at =0 High Luminosity Large Cross sections
New high pT reach Directly identifiable jets J/ψ, Z0 and -family production
Baier,hep-ph/0310274
RHIC
Vogt, hep-ph/0205330
LHC
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 7
Heavy Ion Program @ CMSHard probes Quarkonia Forward
PhysicsForward Physics
Limiting Fragmentation, Saturation, CGC Ultra-peripheral Collisions – PDF in New Regions of x and Q2
High pT and Quarkonia
Jet Quenching, Energy Loss Mechanisms, FF Modifications Calibrated probes of Energy Loss - , Z0, Jet-, Jet-Z0, Quarkonia (J/, ) and Heavy Quarks – Suppression and Recombination
Soft Sector
Centrality and good Event Selection (Npart, Ncoll)
Charged Particle Multiplicity – Initial State Gluon Densities Azimuthal Asymmetry (Flow) – EoS Spectra + Correlations – Sources, Radial Flow, dE/dx and Quenching
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 8
Background: dNch/dy ~ 5000
Jet Reconstruction
Jet resolution: 0.032 0.028 16 %
pp (pileup subtracted)
Jet in Pb + Pb after pileup subtraction
CMS NOTE 2006/050
Jet ET ~100 GeV
Iterative jet cone-finder algorithm
with -dependent Event-by-Event background subtraction
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 9
Jet Reconstruction
Vardanyan
Eff
icie
ncy,
Pu
rity
,%Je
t E
nerg
y R
esol
uti
on, %
Fragmentation functions
Di-jet correlations
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 10
QuarkoniaKodolova, BedjidianSPS
RHIC
LHC?= 35 MeV/c2
Charm spectral suppression vs. T
CMS - The best experiment for mass
spectra measurements of the upsilon family
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 11
Di-Muon Reconstruction
Kvatadze
Mironov
Z0- can be reconstructed with high efficiency
Z0 production will probe nuclear shadowing and parton energy loss
Jet quenching with “calibrated” jets Low background compared to 0-noisy -
jetsZ0 – jet: Cleaner but lower rates
dN/dy ~7000, > 120GeV in Barrel
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 12
CMS HLTPhysics Enhancement with
HLT
In HLT: Centrality, Event Plane, Vertex Position, dN/dET, Ejet, Muon Tracks…
Statistical Significance – 1 Year
Production Rates in Pb+PbC.Roland, Veres
Day-One Measurements
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 13
High pT Suppression/Tracking I. Vitev and M. Gyulassy, PRL 89 (2002)
Inclusive pT Spectra vs. Centrality Nuclear Modification Factors (RAA, Rcp) 200 GeV/c reach based on
Production Rates + HLT
C. Roland
pT [GeV/c]
Res
olu
tio
n (
%)
Momentum Resolution
• Efficiency
o Fake Rate
pT [GeV/c]Efficiency/Fake-rate
(%
)
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 14
Global Physics
Event by Event dN/d and dE/dHit Counting and Tracklets in Pixels
Energy measurements 5.2 (HF) 6.5 (CASTOR)
ch
Extrapolation from RHIC
Silicon TrackerHigh granularity pixel detectorsPulse height in individual pixelsVery low pT reach, pT ~ tens of MeV/c
dE() in adc units
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 15
Elliptical Flow
Reaction Plane
= 0.12 rad
CMS:
RHIC
Reaction plane (R)
x
z
y
xy
z
Petrushanko
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 16
Tracking Performance at Low pT
Tracker
Low pT Tracking Extension with Three Pixel Layers
Efficiency
Fake Rate
Pixel Tracking
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 17
PID Capabilities
dE/dx and Topology (V0):
Pb+Pb @ 5.5GeV ~ high-luminosity minimum bias pp @ 14TeV
CMS NOTE AN-2006/101
The truncated mean dE/dx vs. p
Ferenc Siklér
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Olga BarannikovaWinter Workshop on Nuclear Dynamics, 2007 18
Summary
CMS is:…designed for excellent performance in hard sector
…has unique forward physics capabilities
…a detector with a sophisticated trigger for extended physics reach
….has surprising ability for global/soft physics
…. all of the above
Coverage
Jet Physics Quarkonia
Z0
(Nch, ET) vs. EbyE physics
RAA @ 200 GeV/cIn one year of running