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PHENIX: Status of upgrades and plan for run10/11. RSC meeting, October 2 Ralf Seidl (RIKEN BNL Research Center). New muon trigger system necessary. current trigger (MuID) threshold. W dominant region. simulated muons into Muon Arm (2000pb-1, with PYTHIA5.7). - PowerPoint PPT Presentation
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RSC meeting,October 2
Ralf Seidl (RIKEN BNL Research Center)
New muon trigger system necessary
2PHENIX status of upgrades for run112009/10/2
simulated muons into Muon Arm(2000pb-1, with PYTHIA5.7)
W dominantregion
current trigger (MuID)thresholdσ(tot)=60mb, L=3x1032cm-2s-1 (500GeV)
collision rate = 18MHz (after luminosity upgrade)
DAQ rate limit < 2kHz (for muon Arm)Therefore, required rejection ratio
> 9000
But, MuID-trigger rejection ratio (500GeV) < 100
We need momentum dependent trigger !
PHENIX Muon Trigger Upgrade Project
3
MuID trigger (existing)selecting muon momentum > 2GeV/c
MuTR FEE upgrade (being installed)fast selection ofhigh-momentum-tracks
RPC (being installed)provide timing informationand rough position information
μμμμ
MuID MuIDMuTR MuTR
RPC
RPC RPC
absorber
PHENIX status of upgrades for run112009/10/2
RPCRPC
Upgraded Muon Trigger System
4
digitalizedhit signal Level-1
trigger
PHENIX status of upgrades for run112009/10/2
digitalizedhit signal
digitalizedhit signal
MuMuTrTr
timing informationrough position information
sagitta
Level-1Level-1trigger trigger boardboard
MuTRG-MuTRG-ADTXADTX
RPC RPC projectproject
MuTRG MuTRG projectproject
MuTRG installation status
South Arminstallation is ongoing
will be completed in this shutdown
North Armalready finished installation
2008 Summer commissioning with run9
500GeV pp data
2009/10/2 PHENIX status of upgrades for run11 5
hit efficiency in each station
efficiency = (# of MuTRG hits)/(# of MuTR hits)
considering ADC distribution,hit efficiency 97% in each
stationHit efficiencies in each
station are good
2009/10/2 PHENIX status of upgrades for run11 6
dashed line: the most probable ADCvalue of peak strip
plateau eff = 98.7% plateau eff = 98.6%
plateau eff = 98.4%ADC
effi
cien
cy
ADC
ADC
effi
cien
cy
effi
cien
cy
efficiency and threshold-momentum of MuTRG
plateau efficiency 90% (hit efficiency par station 97%)3 x (vertex cut
efficiency)higher threshold momentum than current trigger
achieve expected efficiency and threshold momentumrejection ratio estimation is also on going
2009/10/2 PHENIX status of upgrades for run11 7
trigger efficiency vs track momentum
sagitta allowance:Δs=1
current triggerthreshold
Resistive Plate Chamber (RPC)Characteristics of RPC
Fast response Suitable for the trigger
deviceGood intrinsic time
resolutionGood spatial resolution:
typically ~ cm Determined by the read-
out strip width and cluster size
Low costTypical gas mixture
95% C2H2F4 + 4.5% i-C4H10 + 0.5% SF6
8
RPC3
RPC1RPC1
2009/10/2 PHENIX status of upgrades for run11
North RPC3South RPC3
RPC1
2009/10/2 9
Half Octatant assembly in tunnel
PHENIX status of upgrades for run11
Module QA with cosmics
Event display
Modules stay in cosmic test stand for at least several days
Evaluate Efficiencies and cluster sizes as a function of HV and threshold
Evaluate noise rates :
2009/10/2 PHENIX status of upgrades for run11 10
Hz/cm2
Module efficiencies and Cluster sizes
High efficiencies from 9.5 kV at reasonably high thresholds
Cluster sizes in the range 1-2 Typical operation mode: 9.7 kV and 140 mV
2009/10/2 PHENIX status of upgrades for run11 11
RPC3N installation status
RPC-3 North installation during 2009 shutdownall North RPC-3 frames are readyAll modules produced8 half-octants produced, in QACrane, grouting, rail finished through PHENIX techs,
installation starting 2009/10/2 PHENIX status of upgrades for run11 12
RPC-3 half octant frame at UIUC
Prototype RPC result from 2009 beam data
2009/10/2 PHENIX status of upgrades for run11 13
2 prototypes have been installed during 2009 run
typical timing resolution 4 5 nsec beam background can be separated enough timing resolution
μμ
beam BGbeam BG
prototype installed in Run9prototype installed in Run9
RPC2RPC3
RPC3RPC2sigma~5.3ns sigma~4.1ns
track reconstructed eventsnsec7~c
L nsec23~cL
MuTRG and RPC installation schedule
MuTRG + RPC3 (not including RPC1) can generate trigger signalthe main purpose of RPC1 is the beam background
rejectionNorth MuTRG + RPC3 system will be complete in 2009South MuTRG + RPC3 system will be complete in 2010
shutdown Ready for run 11
2009/10/2 PHENIX status of upgrades for run11 14
large 500GeV pp run
2009/10/2 PHENIX status of upgrades for run11 15
Silicon Vertex TrackerVTX:
Expected Installation: 2010
16
Silicon Vertex Tracker (VTX)• MotivationMotivation
• Gluon polarization G/G with charm and beauty at low x.
• x dependence of G/G with -jet correlations.
• Heavy flavor tagging• Good vertex resolution < 100m
• Jet reconstruction• large acceptance || < 1.2 and ~ 2.
• Momentum resolution p/p ~ 10%
• Low material X0/X < 2.2%/layer in pixel• Radiation tolerance 1Mrad in 10years
• Requirements for DetectorRequirements for Detector
VTX Installation to PHENIX
g
g Q
QQ = c or b
q
g
q jet
2009/10/2 PHENIX status of upgrades for run11
17
Silicon Vertex Tracker (VTX)
22.7cm
Inner 2 layer : pixel detectorOuter 2 layer : stripixel detector
38.3cm
4 layers barrel structure
pixel layerr=5.0cm z=±10cmr=2.5cm z=±10cm
stripixel layerr=11.5cm z=±16cmr=16.5cm z=±19cm
pixel full ladder
stripixel full ladder
2 for
|| < 1.2
• Large acceptance : || < 1.2, 2 for • High spatial resolution : DCA~ 100 m
2009/10/2 PHENIX status of upgrades for run11
2009/10/2 PHENIX status of upgrades for run11 18
19
charm and beauty separation with difference of their life time
Life time (c) D0 : 125 m B0 : 464 m
DCASimulation
DCA (m)
ppD
B
e
e
Backgroundc quarkb quark
pT (GeV/c)
Subtraction ofbackground
Advantage with VTX Detector
By simultaneous fittingthe DCA distribution
with the expected shapes,charm and beauty are separated.
D e + XB e + X
2009/10/2 PHENIX status of upgrades for run11
RUN 10
No pp physics runningUse run 10 for commissioning of:
north RPCs, south MuTRG and trigger logic
2009/10/2 PHENIX status of upgrades for run11 20
Potential spin physics output from run11
Assumption: Ten weeks 500 GeV
physics run ~50 pb-1 dPolarization of 60 %
Usual channels: lower x, more luminosity
Ws in central arms will profit from VTX: cleaner sample
through more tracking points
Heavy flavor/jet veto
2009/10/2 PHENIX status of upgrades for run11 21
Increased sensitivity to lower x, relative luminosity will not be limiting systematics at low-Pt
22
Double Spin Asymmetries with VTX
Heavy flavorHeavy flavor measurement measurement Gamma - jetGamma - jet correlation correlation
GeVs 5001300 pbLIntegrated Luminosity
Center of mass energy
charmbottom
L = 300 pb -1
P = 0.7
ALL distribution as function of pT
SimulationSimulation
200m < DCA
include backgrounds pT (GeV/c)
g = g
g = -g
GRSV_std
PYTHIA Simulation
ALL distribution as function of xg
GeVs 5001300 pbLIntegrated Luminosity
Center of mass energy
no backgroundsxg
L = 300 pb -1
P = 0.7
SimulationSimulation
2009/10/2 PHENIX status of upgrades for run11
Backward W asymmetries for run11 BUP values
2009/10/2 PHENIX status of upgrades for run11 23
What can we expect (prepared for the DSSV challenge)
2009/10/2 PHENIX status of upgrades for run11 24
Fake reconstructed RB asymmetries for 50 and 150 pb-1 recorded as function of eta with 40 and 50 % polarization respectively, Signal to Background ratio fixed to 3/1, no polarization uncertainty
Forward + Forward -
Backward +
Backward -
Forward + Forward -
Backward +
Backward -
SummaryMuon Trigger upgrade will be ready for run11
RPCs and MuTRG FEE worked as expected in run9good efficiency and momentum-thresholdReadiness for forward/backward W physics
VTX is on schedule to be ready for run11Beam tests as expectedHeavy flavor and jet reconstruction capabilities
RUN11: 50 pb-1 and 60% (?) polarization at 500 GeVW physics in forward/backward and central regionsGluon polarization via , jet and heavy flavor
2009/10/2 PHENIX status of upgrades for run11 25
• NLO pQCD calculation of x distribution for 3 0 pT bins.
• Sampling of GRSV curves gives sensitivity to G within measured x range
2009/10/2 PHENIX status of upgrades for run11 26
arXiv:0810.0694
x
Most recent global analysis : DSSV
NLO analysisInclusion of SIDIS dataInclusion of PHENIX and
STAR jet ALL data(from 200GeV)
Using most recent NLO fragmentation functions (DSS)
Large uncertainties still for sea quarks
Decay data forces s to become negative at small x
RHIC data results in node to g
2009/10/2 PHENIX status of upgrades for run11 27
de Florian et al., PRL101, 072001 (2008)
W production as access to quark helicitiesMaximally parity violating
V-A interaction selects only lefthanded quarks and righthanded antiquarks:
Having different helicities for the incoming proton then selects spin parallel or antiparallel of the quarks
Difference of the cross sections gives quark helicities q(x)
Testing the spin structure at the W scale without fragmentation functions
Large asymmetries to be expected
2009/10/2 PHENIX status of upgrades for run11 28
Expected sensitivities in the forward regionsfull reconstruction,
Backgrounds included, 70% polarization
Signal from RHICBOS (Nadolsky, Yuan ) for recent polarized Parton distribution functions:DeFlorian, Navarro,
Sassot, (including maximally and minimally allowed sea quarks)
Glueck, Reya, Stratmann, Vogelsang
DeFlorian,Sassot, Stratmann, Vogelsang
2009/10/2 PHENIX status of upgrades for run11 29
Future improvements
2009/10/2 PHENIX status of upgrades for run11 30
Vertex Detectors (2011-2012)Large acceptance precision
tracking Heavy flavor tagging Jets Drell-Yan Electrons from charm decays and
beauty decays separately c,b-Jet Correlations
Forward Calorimetery (2012-2013)
Proposed PHENIX Upgrade ( 1 < eta < 3 ) AN Pi0, Direct Photon, Gamma-Jet Full detector simulations in
progressIn correspondence with theorists
Decay kinematics due to helicity conservation
2009/10/2 PHENIX status of upgrades for run11 31
W+ W-
Asymmetries and sensitivities
Large asymmetries in the forward regions due to the u and d quark polarizations
Very different parameterizations in the backward regions due tosea polarizations
Large scale to test quark polarizations Pin down sea
2009/10/2 PHENIX status of upgrades for run11 32