5/14/2010 rhic spin collaboration meeting 1 phenix: the next bup and the next decade j. lajoie for...
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RHIC Spin Collaboration Meeting 15/14/2010
PHENIX: The Next BUP and the Next Decade
J. Lajoiefor the PHENIX Collaboration
RHIC Spin Collaboration Meeting 25/14/2010
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.
RHIC Spin Collaboration Meeting 35/14/2010
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!
RHIC Spin Collaboration Meeting 45/14/2010
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.
RHIC Spin Collaboration Meeting 55/14/2010
High Precision Heavy Flavor
RHIC Spin Collaboration Meeting 65/14/2010
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
RHIC Spin Collaboration Meeting 75/14/2010
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)
RHIC Spin Collaboration Meeting 85/14/2010
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
RHIC Spin Collaboration Meeting 95/14/2010
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…
RHIC Spin Collaboration Meeting 105/14/2010
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
RHIC Spin Collaboration Meeting 115/14/2010
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
RHIC Spin Collaboration Meeting 125/14/2010
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
RHIC Spin Collaboration Meeting 135/14/2010
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.
RHIC Spin Collaboration Meeting 145/14/2010
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
RHIC Spin Collaboration Meeting 155/14/2010
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
)
RHIC Spin Collaboration Meeting 165/14/2010
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.)
RHIC Spin Collaboration Meeting 175/14/2010
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)
RHIC Spin Collaboration Meeting 185/14/2010
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.
RHIC Spin Collaboration Meeting 195/14/2010
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)
RHIC Spin Collaboration Meeting 205/14/2010
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
RHIC Spin Collaboration Meeting 215/14/2010
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
RHIC Spin Collaboration Meeting 225/14/2010
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
RHIC Spin Collaboration Meeting 235/14/2010
DIS vs. Diffractive (Hadrons)
E.C. Aschenauer PheniX & STAR meet EIC 23
4x100
4x250
4x250
4x1004x50
4x50
RHIC Spin Collaboration Meeting 245/14/2010
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
RHIC Spin Collaboration Meeting 255/14/2010
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!
RHIC Spin Collaboration Meeting 265/14/2010
BACKUP
RHIC Spin Collaboration Meeting 275/14/2010
FOCAL Acceptance = 1.2-2.7 (red circle) = 0.27 (x 2) = 1.6-2.7 (blue circle)
= 2
27
RHIC Spin Collaboration Meeting 285/14/2010
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 Spin Collaboration Meeting 295/14/2010
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)