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Plans/ideas for next funding period

Plans/ideas for next funding period. ALICE upgrades Discussion has started Timeslots for potential upgrades 2013: ½ year shutdown (minor upgrades) 2016/2017: 1 year shutdown (major upgrades, e.g. beam line modifications) Potential projects New pixel layers (close to beam, higher resolution)

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Plans/ideas for next funding period

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  1. Plans/ideas for next funding period • ALICE upgrades • Discussion has started • Timeslots for potential upgrades • 2013: ½ year shutdown (minor upgrades) • 2016/2017: 1 year shutdown (major upgrades, e.g. beam line modifications) • Potential projects • New pixel layers (close to beam, higher resolution) • Forward calorimeter • Compressed Baryonic Matter (CBM) experiment at FAIR/GSI (ESFRI project) • First beam: not before 2015

  2. ALICE upgrade: forward physics at LHC • Measurements at small angle/large pseudorapidity • Main physics topic • p(d)+A • low-x region • study of ”cold” nuclear matter • probing the initial condition

  3. 108 106 104 102 100 M2 (GeV2) 10-6 10-4 10-2 100 x Kinematics 1 RHIC example • At 4° (y~3 for pions) and pT=1 GeV/c one can reach values as low of x2 ~ 10-4 • This is a lower limit, not a typical value: most of the data collected at 4° would have x2~0.01 21 process y=rapidity of (xL, k) system 2 22 process Guzev, Strikman, and Vogelsang (hep-ph/0407201)

  4. r/ ggg Anti Shadowing Shadowing Initial and final effects – dAu • Initial effects • Wang, Levai, Kopeliovich, Accardi • Especially at forward rapidities: • Eskola, Kolhinen, Vogt, Nucl. Phys. A696 (2001) 729-746 • HIJING • D.Kharzeev et al., PLB 561 (2003) 93 • Others • B. Kopeliovich et al., hep-ph/0501260 • J. Qiu, I, Vitev,hep-ph/0405068 • R. Hwa et al., nucl-th/0410111 • D.E. Kahana, S. Kahana, nucl-th/0406074 “Cronin effect” Initial state elastic multiple scattering leading to Cronin enhancement (RAA>1) broaden pT Nuclear shadowing depletion of low-x partons Gluon saturation depletion of low-x gluons due to gluon fusion ”Color Glass Condensate (CGC)” Suppression due to dominance of projectile valence quarks, energy loss, coherent multiple scattering, energy conservation, parton recombination, ...

  5. Comparison pQCD vs CGC LO pQCD calculation (nuclear shadowing) vs CGC Global analysis of nPDFs including BRAHMS data K.J. Eskola, H. Paukkunena, C.A. Salgadoc, hep-ph 08020129v1 (2008) d’Enterria • Conclusions (dAu at RHIC) • The suppression and in particular the inversion vs. centrality of RdAu at high rapidity may be a signature for the gluon saturation and the small-x evolution. • Stronger gluon shadowing -> EPS08 • Alternate explanations e.g. suppression due to large xF effects work quite well too (suppression effects at SPS!)

  6. LHC prospects • Predictions • pseudorapidity asymmetry for d+Pb -> pi0+X at 8.8 ATeV for |eta| < 0.9 and 2.4 < |eta| < 4.0. • Solid line: EPS08 nPDFs, dashed line: HIJING with the • inclusion of multiscattering, dot-dashed line: HIJING without multiscattering. A. Adeluyi et al., arXiv:0808.0682v1

  7. Upgrade idea • Forward meson spectrometer • Goals • Study low-x phenomena • Jet quenching in less dense matter • Pt spectra of identified particles • Nuclear modification factor • Correlation studies forward-midrapidty • Requirements • x < 10-5 • Acceptance • y  4...5 • 0 GeV/c < pt < 30 GeV/c

  8. Upgrade idea • Forward meson spectrometer • Conceptual design • EM-Calorimeter for gamma, pi0, eta, J/Psi at y=5 • O(10) meters away from IP • large dynamic range • high occupancy (A+A) • two g separation (p0 -> 2g kinematics) highly segmented (also longitudinally) tracking calorimeter ala CALICE?

  9. Challenge • Where to put the calorimeter • Large distance from IP (50m) • ”Standard” calorimeter design • Conflict with LHC magnets, new beamline • Close to the IP (5-20m) • Very high segmentation (ala CALICE) FoCal

  10. CBM experiment at FAIR/GSI • Facility for Antiproton and heavy Ions Research • Funded, construction will start soon • CBM experiment • super-dense baryonic matter • in-medium properties of hadrons

  11. Debye Screened Baryons Number N ~ Nc Chiral T 2 Quark Gluon Plasma Critical Point Baryon energy density ~ Meson energy density RHIC LHC SPS Confined No Baryons N ~0(1) Not Chiral Confined Baryons N ~ NcNf Chiral FAIR AGS Confined Matter Quarkyonic Matter Liquid Gas Transition Color Superconductivity Conjectured Phase Diagram for Nc = 3

  12. CBM

  13. CBM

  14. CBM • Physics interest • QCD critical point - fluctuations • Chiral symmetry restoration – in-medium modifications of hadrons • Possible instrumentation activities • Monolithic Active Pixel Sensor readout (3D stacking) • Projectile Spectator Detector (forward calorimeter) • Online event reconstruction

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