PHENIX: Status of upgrades and plan for run10/11

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


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


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 :


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


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


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


large 500GeV pp run


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


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


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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


RUN 10

No pp physics runningUse run 10 for commissioning of:

north RPCs, south MuTRG and trigger logic


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


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


Backward W asymmetries for run11 BUP values


What can we expect (prepared for the DSSV challenge)


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


• NLO pQCD calculation of x distribution for 3 0 pT bins.

• Sampling of GRSV curves gives sensitivity to G within measured x range


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


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


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


Future improvements


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


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


PHENIX: Status of upgrades and plan for run10/11

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