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Prospects for Quarkonia Physics In Media at the LHC

Prospects for Quarkonia Physics In Media at the LHC. J / . c c. Outline. Ultra High Energy Nuclear Physics Why are Quarkonia Important ? Experiments, Coverage, Rates Summary and Outlook. Temperature or Density. Ultra High Energy Nuclear Physics.

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Prospects for Quarkonia Physics In Media at the LHC

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  1. Prospects for Quarkonia Physics In Media at the LHC

  2. J/ cc Outline • Ultra High Energy Nuclear Physics • Why are Quarkonia Important ? • Experiments, Coverage, Rates • Summary and Outlook

  3. Temperature or Density Ultra High Energy Nuclear Physics Attempt to reproduce the state of nuclear matter a few μs after the Big Bang Long range confining potential is screened Spontaneously broken approximate SU(2) flavor symmetry is restored

  4. The Importance Of Quarkonia hep-ph/0105234

  5. cc J/ pre-equilibrum effects break up by co-moving hadrons color screening, thermal production pre-resonance absorbtion Time Zones precursor color singlet quarkonia quarkonia local time medium local time

  6. (dN/dy)AA = Nbinary (dN/dy)pp Nbinary ~ A4/3 sgeo ~ A2/3 sAA = A2 spp Pb + Pb s = 5.5 TeV A1/3 Spectators Participants Spectators AA Cross Sections For Quarkonia L = 5 x 1026 cm-2 s-1 From a one month run with a 40% duty cycle Lint = 0.5 nb -1 N J/μμ = 2.54 x 107 Nμμ = 1.52 x 105

  7. Experimental Coverage & Rates Pythia 6.150 tuned to NLO extrapolated to LHC* Simple , pt cuts for detector apperture. *Draft Yellow Paper ”Hard Probes In Heavy Ion Collisions at the LHC: Heavy Flavor Physics”

  8. J/ μ+μ-, J/ e+e- •  μ+μ-,   e+e- Forward Muon Spectrometer Central detectors are capable of electron pion discrimination (pt>1 GeV) and triggering (pt>3 GeV) ALICE

  9. ALICE J/m+m- central e+e- || < 0.9 pt > 3.0 GeV Ngeo=2.1x104

  10. ALICE J/e+e- forward m+m- 2.4 <  < 4.0 p> 4.0 GeV Ngeo=8x105 Low pt coverage

  11. CMS Measure J/ μ+μ-,  μ+μ- Inner Silicon Tracker 2-4% occupancy in the pixels layers 18% in the outer 5 Si strip detectors (dN/d ~ 8000) EMCAL is 1.3m from the interaction point, >99% of the background form decay muons is rejected || < 1.4 (barrel) || < 2.4 (end cap) pt > 3.0 GeV || < 1.4, ptot > 4.0 GeV 1.4<||< 2.4

  12. ATLAS ATLAS Measure J/ μ+μ-,  μ+μ- Inner Silicon Tracker <1% occupancy in the inner 3 pixel layers, 6-15% occupancy in the outer 4 Si strip layers (dN/d ~ 8000) Independent momentum measurement in muon spectrometer. Need inner tracker matching for resolution on the  states. || < 1.0 (barrel) , || < 2.5 (endcap) pt > 3.0 GeV (barrel)

  13. Rate Summary Plenty of signal to study the suppression pattern of J/ and  at the LHC Lint = 0.5 nb -1 J/ yields are sensitively dependent on low momentum threshold. Trigger efficiency is an issue for CMS & ATLAS

  14. Saturation Physics The ratio of the EKS98 corrected nuclear gluon distribution to CTEQ5L overlapping color sources lead to the saturation of the gluon phase space in the initial state nuclear wavefunction

  15. x coverage Coverage over 5 decades in x for which nuclear effects in the gluon density are expected to manifest The ratio of the EKS98 corrected nuclear gluon distribution to CTEQ5L

  16. c Chasing The Can we measure c

  17. c1 c2 c0 Outlook Can we measure c /  vs pt is very interesting

  18. J/ cc c  From Quarkonia local time gets dilated as a function of pt. This make the ratios of directly produced quarkonia a probe of the plasma lifetime Same binding energy

  19. Summary Measurements are underway at RHIC of the J/ suppression pattern LHC will extend the study of in media quarkonia to the upsilon family of resonances Saturation physics and nuclear modifications to the gluon pdf studied down to x ~ 10-5 Potential to reconstruct the  states and study the time evolution of the medium.

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