The sPHENIX Barrel Upgrade: Jet Physics and Beyond John Haggerty Brookhaven National Laboratory on behalf of the PHENIX collaboration Quark Matter 2012.

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Presentation transcript:

The sPHENIX Barrel Upgrade: Jet Physics and Beyond John Haggerty Brookhaven National Laboratory on behalf of the PHENIX collaboration Quark Matter 2012

The sPHENIX concept Design a major upgrade to PHENIX to address fundamental questions about the nature of the strongly coupled QGP near T c at RHIC Emphasizes jet physics observables with calorimetry initially Provides a solid platform for future upgrades and enhancements Takes advantage of the luminosity improvements due to stochastic cooling and the wide range of species and energies available at RHIC Designed around new technologies that enable a more compact detector, and reuses as much of the PHENIX infrastructure as possible, both helping to keep costs down August 17, 20122

Outline Physics motivation The detector concept and design goals Description of the detector design Expected performance of the detector Where to get more information Summary August 17, 20123

η/s How does η/s go from being nearly as small as possible near T c to the weakly coupled limit? The figure shows several state-of-the-art calculations and three generic scenarios approaching T c August 17, 20124

Jet observables A parton traversing the medium accumulates transverse momentum characterized by Coupling parameters like q ̂ are scale dependent and must approach weak coupling at high energies and strong coupling at thermal energies August 17, 20125

Experiment to confront theory We have benefitted from the formation of a theoretical collaboration to study these issues The key questions for the feasibility of the experiment are: –Are the jet rates large enough at RHIC? –Are the jets distinguishable from background fakes? August 17, See Coleman-SmithColeman-Smith presentation, Thursday

Jet rates at RHIC At present RHIC luminosity, in a 20 week Au+Au run we would have 10 6 jets above 30 GeV in 0-20% centrality August 17, 20127

Fake jets Using 750B minimum bias HIJING events True jets outnumber fake jets for p T > 20 GeV/c Details published as Hanks et al., arXiv: , published in PRC August 10 arXiv: August 17, 20128

Design goals for a jet detector at RHIC Full azimuthal coverage in a fiducial region |η|<1 2 T solenoid to ultimately allow high resolution tracking in a small volume Electromagnetic and hadronic calorimetry –Electromagnetic Δη x Δφ ≈ 0.02 x 0.02 σ E /E ≈ 15%/√E –Hadronic Δη x Δφ ≈ 0.1 x 0.1 σ E /E ≈ 100%/√E Data acquisition capable of recording >10 kHz August 17, 20129

sPHENIX concepts Take advantage of new technologies for a very compact design Tungsten-scintillator EMCAL makes detector more compact than previously possible SiPM’s or APD’s are small, don’t require high voltage, and work in a magnetic field Hadron calorimeter can serve as flux return HCAL uses fiber embedded in scintillator for light collection ala T2K Commercial electronics when possible, existing ASIC’s when not New technologies not available ten years ago minimize costs and build on experience in PHENIX August 17,

August 17,

August 17,

August 17,

2 T Solenoid 70 cm inner radius ≈ 1 X 0

Electromagnetic calorimeter Optical accordion Tungsten absorber Scintillating fiber

Hadronic calorimeter August 17,

SiPM August 17, Design based on existing parts Gain stabilization on detector Economical in large quantities

G EANT4 simulation 10 GeV/c pion showering in the hadronic calorimeter

Expected performance of calorimeters Single particle resolution in EMCal+HCal Jet energy resolution From GEANT4 in p+p better than 65%/√E 90%/√E

Jet physics sPHENIX Day 1 measurement of inclusive jet spectrum to measure jet quenching F ASTJET anti-k T algorithm applied to p+p and Au+Au collisions –Fast simulation using results of full detector simulation –Additional smearing of the underlying event added –Unfolding to recover input spectrum August 17,

R AA resolution August 17,

Beyond the baseline sPHENIX can be extended Improved tracking in the magnetic field for high resolution momentum measurement A preshower detector which improves the reach of γ  π  separation and electron identification There is another effort exploring the possibility for forward physics with additional instrumentation We have considered from the beginning how it could evolve to a detector at an EIC August 17,

More detail 23 There is much more information in arXiv: arXiv:

sPHENIX posters sPHENIX Jet Upgrade Program: Unraveling Strong vs Weak Coupling, J. Nagle Jet Physics Simulations for the sPHENIX Upgrade, A. Hanks sPHENIX Jet Reconstruction Performance, A. Sickles Photon Reconstruction in the sPHENIX Electromagnetic Calorimeter, M. Purschke Quarkonium measurements with the proposed sPHENIX detector, M. Rosati The Tungsten-Scintillating Fiber Accordion Electromagnetic Calorimeter for the sPHENIX Detector, C.Woody Hadronic Calorimetry in the sPHENIX Upgrade Project at RHIC, E. Kistenev A Silicon Photomultiplier (SiPM) Based Readout for the sPHENIX Upgrade, E. Mannel August 17,

Next steps We submitted a proposal to Brookhaven management on July 1, 2012 Most of the proposal is available as arXiv: arXiv: A laboratory review will take place in October We are pursuing an aggressive schedule to review, fund, and construct this detector August 17,

Summary Jet physics accessible at RHIC complements and extends measurements made at the LHC The sPHENIX proposal consists of a small number of well defined components which builds on the experience of building and operating the PHENIX detector to carry out a program of jet physics measurements at RHIC