PHENIX High pt Upgrades Recent Progress Yasuo MIAKE For High pt Upgrade Team highpt
Summary of Recent PHENIX Results
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Transcript of Summary of Recent PHENIX Results
04/22/2023 2013 RHIC & AGS Annual Users' Meeting 1
Summary of Recent PHENIX Results
J. Lajoie, Iowa State University
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Outline
• d+Au and Cold Nuclear Matter• Geometry studies with Cu+Au• Spin and nucleon structure
We have entered a detailed exploration phase at RHIC where we are now able to begin separating fundamental QCD from non-ideal effects (CNM, geometry,…).
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The Devil’s in the Details
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The Baryon Anomaly (Au+Au)
proton/pion antiproton/pion
PRL 91, 172301 (2003), PRC 69, 034909 (2004)
Excess (anti) baryons compared to pions at moderate pT (2-5 GeV/c).
Does not look like vacuum jet fragmentation.
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The Baryon Anomaly in d+Au?The start of the “Baryon Anomaly” is present in CNM – not a QGP effect? Or is it? Challenges explanations that require a high parton density.
Central d+Au ratios look a lot like peripheral Au+Au ratios.
Clear enhancement of baryons as a function of centrality.
PHENIX arXiv:1304.3410v1
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arXiv:1303.1794
Near- and away-side features seen in both central and peripheral; Δη gap limited to Δη>0.5
Two-Particle CorrelationsVery similar to LHC! Central-peripheral difference is symmetric: two ridges? or flow?
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Fourier moments Cn of (Cent-Periph) distributions
versus associated pT
Inferred quadrupolar anisotropy v2 of h+- vs pT
PHENIX arXiv:1303.1794
Just Geometry + Flow?
arXiv:1304.3403
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xd~xAu
PHOBOS Phys. Rev. C72, 031901
x10
x3xd>>xAuxd<<xAu
More central d+Au produces more “bulk”
going with Au
Is it purely a parton-level effect? Or is there more to it?
Rapidity Matters…
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Large Dh Correlations
First observation of long – range ridge correlations at RHIC!
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BBC
μ μe
Single leptons from heavy flavor decays
Qualitatively consistent with
expectation: Au-going enhanced d-going decreased with centrality
Open Heavy Flavor
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PHENIX Phys. Rev. Lett. 107, 142301 (2011)
Trends broadly consistent with more production in Au-going direction. Can we determine
transverse spatial dependence of nuclear modification?
Baseline model --EPS09 with linear thickness dependence,
plus single breakup-cross section -- cannot reproduce
centrality dependence in detail.
Confronting the J/Y
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Comparing the J/Y and Y’
Y’ data indicatethat there are effects at shorttimescales that suppress Y’ relativeto J/Y.
Expect increasedsuppression whentime in nucleusis comparable to formation timecc
PHENIX arXiv:1305.5516
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Cu+Au: Geometry!
A program that takes advantage of unique capabilities at RHIC:
Find x:
Left/right asymmetric density profile. Odd Harmonics Corona on Au-side
Central collisions No corona on Cu-going
side
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Harmonic Components
Aneta Iordanova (Wednesday)
Stronger v1, opposite sign from AMPT.
v2 trends as expected
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RHIC and LHC
No change in shape across a wide range in center-of-mass energy – driven by geometry!
Jeff Mitchell (Wednesday)
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• There’s a lot underway….– Gamma-hadron correlations– Azimuthal HBT– Dileptons with the HBD– Heavy flavor with the VTX/FVTX– …
A lot going on with Au+Au…Suppression of high zT hadronscorrelated with direct photons – another (key) handle on jet quenching
arXiv:1212.3323
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Run-13, Spin, and the W
156 pb-1
Ming Liu (Tuesday)Hubert van Hecke (Thursday)
Data production underway – expect to analyze Run-13 500 GeV data during SpinFest @ RIKEN in July
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• RL syst. uncert. O(10-3) • Run9 Stat uncert. O(10-3)BUT • Forward asymmetry O(10-4) (expected)• On disk already: FOM 50x greater than run9, so new stat error will be O(10-4) • RL syst. uncert. hopefully also gets to O(10-4)
max signal expected from DSSV
Run, s syst
2005, 200 2.5x10-4
2006, 200 7.5x10-4
2009, 200 14x10-4
Relative Luminosity Syst Error History
ALL At Forward Rapidity
Scott Wolin (Tuesday)
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The Future• New upgrades ready for new physics!
MPC-EX Upgrade (2015) – spin andCNM physics
The FVTX and VTX – ready for HI measurements in 2014!
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• d+A collisions are NOT p+A collisions!– Large intrinsic e2
• RHIC has the unique capability to vary the collision geometry to explore the initial state
p+A: More Geometry Control
He3+Au MC Glauber
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Polarized p+A Collisions
Single spin asymmetries can act as a probe of the saturation scale.
A unique capability of RHIC!
2 2 2
2 2
2/
2h sp
h sA
pA hP QspN
pp hN sAP Q
QA eA Q
RL
RLN PA
1
Right
Left
Qsp2 = (1.0 GeV)2
QsA2 = (2.5 GeV)2
= 0.16 GeV
• Dependence of QsA on A• Combined with other measurements
this can estimate Qsp
Richard Seto (Tuesday)Kang, Yuan: PRD 84, 034019 (2011)
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Conclusions• To extract fundamental QCD physics from the QGP at RHIC we will
have to deal with initial state aspects: – Cold Nuclear Matter (nPDF’s)– Finite-size systems (geometry)– Exciting new physics?
• We are now entering a phase where we have detailed measurements that will make this possible!
• Spin measurements are relentlessly constraining the gluon spin
• PHENIX will continue to pursue a broad-ranging, curiosity-driven physics program that takes full advantage of the flexibility of RHIC!
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BACKUP
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Transverse Energy
Transverse energy for Cu+Cu similar to Au+Au at same Npart, but Cu+Au higher. Jeff Mitchell (Wednesday)
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Upsilon
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Ridge in d+Au
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Identified RdAu
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Y’/(J/Y)
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