5/14/2010 RHIC Spin Collaboration Meeting 1 PHENIX: The Next BUP and the Next Decade J. Lajoie for the PHENIX Collaboration

RHIC Spin Collaboration Meeting 15/14/2010

PHENIX: The Next BUP and the Next Decade

J. Lajoiefor the PHENIX Collaboration


Charge from Steve Vidgor

ALD Steve Vigdor has charged PHENIX and STAR to write decadal plans due August 1, 2010.

Summarize detector upgrades underway and to be utilized in the next 5 years.

Compelling science beyond 5++ years that require additional detector upgrades and machine capabilities.

Prioritize the physics and the upgrades above.

Discuss the option of an electron beam in the tunnel and thus an ePHENIX and eSTAR in the MeRHIC and EIC era.


Caveats The PHENIX BUP for Run11-12 is still in

development Still, it’s relatively straightforward

The PHENIX Decadal Plan is a moving target Active effort within the PHENIX Collaboration As of now, there is no “official” Decadal Plan What you will see is my take on the current

process Of course, it’s probably biased

PHENIX has decided to THINK BIG! RHIC will have no future if it does not pursue

exciting new physics discoveries!


The Next Five YearsRun-10

Run-11: Silicon VTX on schedule.Precision heavy flavor era!

Muon Trigger Upgrade on schedule! Forward Wm

DAQ Upgrade on schedule!

Run-12: Forward silicon VTX available.

Run-14:Forward Calorimetry (FOCAL proposal)

Critical to exploit the detectors to do the physics they were designed for.


High Precision Heavy Flavor


The FOCAL Si-W calorimeter

44cm from the interaction point

Replaces existing Cu nosecone

Modular Brick construction

Physics Goal Gluon PDF at low-x via direct

photons

This is a very new type of detector!A hybrid between a calorimeter and a tracking detector


The PHENIX Run-11/12 BUP Run-11:

Anticipate an even split between AuAu and 500GeV pp running:

pp – commissioning/physics with muon trigger and VTX

AuAu – first physics running with VTX Considering how useful ~1-2 weeks of U+U

running would be Run-12:

Additional physics running at 500GeV HI running with VTX and FVTX

Will ask for some pp low energy running (HI comparison – 62.4, 39, 22.4 GeV)

Some AuAu low energy running Excitation of constituent quark scaling

(~20GeV)


Run-11 Spin Goals and Assumptions

PHENIX wants to emphasize that 500GeV polarized running in Run-11 is commissioning for both the collider and PHENIX New PHENIX Muon Trigger New VTX detector

Assuming ~10 weeks of 500 GeV running, this should be broken into two parts: First ~4 weeks: Collider commissioning, detector

setup Expect priority is on luminosity and polarization

development, beam for experiments on evenings Next 4-5 weeks: Physics running for W AL

Emphasis on stable running conditions PHENIX assumes it will integrate ~50pb-1


Run-11 Expectation AL W->m

Assumes 50pb-1, P=50%

S/B=0.3 – Believe we can ultimately achieve S/B=3.0, but this requires additional analysis and development

S/B uncertainty shown as gray box

Run-11 is the beginning of the W physics program…


PHENIX Near-Term Spin Goals

Main PHENIX focus is W physics! Need to insure we accumulate sufficient

integrated luminosity Expect to run at least three years

Run-11 through Run-13? Additional spin physics efforts:

Longitudinal (500GeV): ALL for p0, h, charm, direct photons

Transverse (depends on running): IFF, AN for charm Could be 200GeV (HI comparison running) Particle correlations over a range of rapidities


Long-Term HI Physics Objectives

q: fast color triplet

q: fast color octet

C: slow color octet

B: slower color octet

QQ: slow color singlet/octet

QQ: fast color singlet/octet

Photon: colorless

Jets and Leading Hadrons

Heavy Flavor

J/y and Upsilons

High pT J/y

Hot QCD Medium


How to Upgrade PHENIX?Step #1: Remove the outer PHENIX Central ArmsStep #2: Replace Axial Field Magnet with Solenoid (2 Tesla with inner radius = ~70 cm).Step #3: New silicon tracking layers at 40 and 60 cmStep #4: Compact EmCal (Silicon/Tungsten) |h|<1.0

8 cm total depth and preshower layerStep #5: Hadronic Calorimeter Outside MagnetStep #6: Maintain high DAQ bandwidth and triggers

Result PHENIX Reborn


sPHENIX? sPHNX?

Preshower60cm

2T SolenoidEMCAL

HCAL

Silicon TrackerVTX + 1 layer

Silicon TrackerFVTX

1.2 < h < 2.7 8o < q < 37o

68cm

IP

80cm

145cm

A complete redesign of PHENIX focused on the next generation of physics questions at RHIC.


GEANT4 Performance Evaluation

p0 E=40 GeV

g/p0 separation over full kinematics > 50 GeV

Excellent electron-ID for pT > 2 GeV

Need detailed study at lower pT as well.

Energy Resolution

p+ E= 5 GeV

electrons E= 5 GeV


Jet Reconstruction

With tracking, dominated by “fakes” above some pT (e.g. pT > 10 GeV). Thus, low overall efficiency for true high energy jets.

Bias in spectra reconstruction when FF is uncertain. Issue largely solved with EMCal + HCal for jet energy!

Mike McCumber (Colorado)

Fas

tJet

(an

ti-kT

)

Fas

tJet

(an

ti-kT

)


Forward Physics Objectives Transverse spin phenomena

Kinematics high xf, high rapidity | | h > 2 Drell-Yan test QCD prediction for Sivers between SIDIS

and DY Separate Sivers and Collins and do a flavor separation

for the PDFs p0-jet, g – jet, IFF for identified hadrons, jet AN, direct photon

Longitudinal spin phenomena high rapidity | | h > 2 extend x coverage for DG and Dq

Drell-Yan in dAu Measure quark distributions in nuclei Possible access to quark saturation

EIC physics Measure polarized and unpolarized inclusive structure

functions in ep / eA (F2, FL, F3, g1, g2, g5) “Diffractive physics” (DVCS, etc.)


What is Required? All measurements need increased

acceptance in the forward direction (|h|>2) than the current muon arms provide

Apart from DY all the measurements require EM calorimetry and PID DY can be done with muons and/or electrons so

no disadvantage Hadronic calorimetry required for

Transversity+Collins (similar jet reconstruction issues as Central PHENIX)


Scenario I: DY at High hMPC 3.1 < | h | < 3.9 2.5o < Q < 5.2o Muon Arms 1.2 < | h | < 2.4 South: 12o < Q < 37o

North: 10o < Q < 37o

Central Arms | h | < 0.35 60o < Q < 110o

Keep South Muon arm and put m-detectors in the gap between MuTr/MuID.

May require dipole magnet before muon piston iron.

Upgraded FVTX required to cover acceptance.


Scenario I Pros and Cons Advantage:

Modest upgrade Cost if no magnet is needed around ~2-3M$ Many technologies available RPC If additional magnet is needed modifications become

significantly more involved higher costs ~5M$

Disadvantage: Very limited physics capabilities Only possible in south muon arm (no gap in

north muon arm)


Scenario II: Full Forward Spectrometer

HCALEMCAL

Preshower60cm

2T SolenoidEMCAL

HCAL

Silicon TrackerVTX + 1 layer

Silicon TrackerFVTX

1.2 < h < 2.7 8o < q < 37o

RICH

68cm

IP

80cm

145cmNorth Muon Arm


Scenario II: Pros and Cons Advantages:

Can address all the physics objectives Will keep the PHENIX spin community interested Will be able to participate in EIC EMCal could re-use currently existing PHENIX central arm EMCal

new electronics needed ~2M$ HCal could try to re-use an HCal from an other experiment or use

the same technology as in central detector ~?M$ RICH

COMPASS or LHC-b design ~4M$ Additional Tracking:

GEM tracker? less mass than Si-trackers Improve STAR design: Cost ~3M$

Total Cost in the order of 12M$

Disadvantage: Relatively high cost


ep/eA Physics Lets concentrate on 4GeV lepton energy

electron beam “replaces” yellow hadron beamProton Energy

50 GeV 100 GeV 250 GeV

4x50

pe: 0-1 GeV pe: 1-2 GeV pe: 2-3 GeV pe: 3-4 GeV

e-p/A

180o 0o


DIS vs. Diffractive (Hadrons)

E.C. Aschenauer PheniX & STAR meet EIC 23

4x100

4x250

4x250

4x1004x50

4x50


Diffractive Kinematics (p’)

4 x 100

t=(p4-p2)2 = 2[(mpin.mp

out)-(EinEout - pz

inpzout)]

4 x 50

4 x 50

4 x 250

?

Diffraction:

Roman pots required to detected outgoing proton


Conclusions The future of RHIC will require a bold effort

to directly address fundamental questions in QCD: Heavy Ions:

Quantitative study of the QGP Spin:

Separation of Sivers and Collins+Transversity DY to test modified universality

ep/eA: Inclusive and diffractive measurements to get us on

the road to the full EIC PHENIX is developing a comprehensive

upgrade plan to pursue an exciting, broad physics program over the next decade at RHIC!


BACKUP


FOCAL Acceptance = 1.2-2.7 (red circle) = 0.27 (x 2) = 1.6-2.7 (blue circle)

= 2

27


NLO pQCD (W. Vogelsang)CTEQ6M5, DSS FF

pp @ 200 GeV |h|<1.0

q,g jetsDirect g

Fragmentation gp0 (assume RAA = 0.2)

Counts per 2.5 GeV bin in 50B AuAu Events

JetsPhotons

p0


RHIC-II Luminosity Projections

RHIC II luminosity and new proposed DAQ upgrades can yield 50 billion AuAu event samples

(and with great new detector capabilities).

DAQ2010

SuperDAQ(i.e. sDAQ)

Documents

5/14/2010 RHIC Spin Collaboration Meeting 1 PHENIX: The Next BUP and the Next Decade J. Lajoie for the PHENIX Collaboration