FNAL E866/NuSea ACU, ANL, FNAL, GSU, IIT, LANL, LSU, NMSU, UNM, ORNL, TAMU, Valp

FNAL E866/NuSea ACU, ANL, FNAL, GSU, IIT, LANL, LSU, NMSU, UNM, ORNL, TAMU, Valp www.phwiki.com

FNAL E866/NuSea ACU, ANL, FNAL, GSU, IIT, LANL, LSU, NMSU, UNM, ORNL, TAMU, Valp

Paulsen, Sasha, Features Editor (Food, Wine and Art) has reference to this Academic Journal, PHwiki organized this Journal FNAL E866/NuSea ACU, ANL, FNAL, GSU, IIT, LANL, LSU, NMSU, UNM, ORNL, TAMU, Valpo A measurement of Anti-quark asymmetry in the Nucleon Sea From Draft NSAC Long Range Plan : “The Structure of the Nuclear Building Blocks” Modification of parton momentum distributions of nucleons embedded in nuclei e.g. shadowing – depletion of low-momentum partons. Process dependent Nuclear effects on parton “dynamics” energy loss of partons as they propagate through nuclei in addition to (associated) multiple scattering effects Nuclear modification of parton level structure & dynamics Drell-Yan E866 R(W/Be) E772 R(W/D) Ratio(W/Be) 1.0 0.9 0.8 0.7 NMC DIS Drell-Yan Process

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Nuclear Dependence as long as heavy vector mesons, e.g. J/, ‘, production: color singlet or octet ( ) in addition to color neutralization timescale hadronization time: Coherence length as long as cc fluctuations: absorption on nucleons or co-movers feed-down from higher mass resonances, e.g. c E789 NA50 – Anomalous J/ suppression. Evidence as long as QGP J/ suppression – an effective signature of Quark-gluon plasma (QGP) as long as mation Color screening in a QGP would destroy pairs be as long as e they can hadronize into charmonium But ordinary nuclear effects also absorb or modify J/’s We need a comprehensive underst in addition to ing of charmonium production in nuclei Competing effects may be identified in p-A collisions by their strong kinematic dependencies, together with complementary studies of Drell-Yan scattering in addition to open-charm production E866/NuSea: 800 GeV p-A (Fermilab) PRL 84, 3256 (2000) J/ in addition to ’ similar at large xF where they both correspond to a traversing the nucleus but ’ absorbed more strongly than J/ near mid-rapidity (xF ~ 0) where the resonances are beginning to be hadronized in nucleus. open charm: no A-dep at mid-rapidity Hadronized J/Y PT Broadening at 800 GeV a(pT) shape is independent of xF & same as long as NA3 at a lower energy

E866 – Preliminary Baier et al. NP B484, 265 (1987) or So energy loss associated with observed pT broadening is tiny, e.g. as long as W: PT Broadening in Drell-Yan in addition to associated Radiative Energy Loss Analysis of our p-A Drell-Yan data (E772 – PRL 64, 2479 (1990) using the Kopeliovich model. Dashed lines with shadowing only; solid lines with parton energy loss of, dE/dz = 2.32 ± 0.52 ± 0.5 GeV/fm Charged hadron in addition to p0 production at PHENIX versus pT as long as central collisions which, when compared to pQCD models that work well as long as peripheral collisions, suggests that jet-quenching or energy-loss may be present. dE/dx = 0 dE/dx =0.25 Johnson, Kopeliovich et al., PRL 86, 4483 (2001) Shadowing dE/dx & Shadowing Quark energy loss in nuclear matter Gluon Shadowing as long as J/’s – predictions Kopeliovich, Tarasov, & Hufner hep-ph/0104256 Eskola, Kolhinen, Vogt hep-ph/0104124 J.C.Peng, LANL E866/NuSea PHENIX +- e+e- PHENIX +- (Au) In PHENIX acceptance as long as Au-Au collisions Eskola : ~ 0.8 Kopeliovich : ~ 0.4 Strikman [hep-ph/9812322] : ~ 0.4 PHENIX PHENIX e E866 (mid-rapidity) NA50 Expected statistical errors from a 2-week d-A run at PHENIX in addition to measurements as long as m E866/NuSea

Kopeliovich et al, hep-ph/0110221 “Light Cone Dipole” approach Theoretical Models as long as PT Broadening R(Au/H) (full) (longitudinal only) RHIC LHC Predicts a different dominant mechanism as long as pT broadening in DY at RHIC & LHC energies: For lower energy fixed target measurements initial-state multiple scattering is most important But at RHIC & LHC color filtering preserves small dipole configurations which have high-pT in addition to there as long as e give larger pT broadening DY as bremsstrahlung in the target rest frame J/ Polarization E866/NuSea NRQCD based predictions (color octet model) necessary to explain CDF charm cross sections E866 J/Y measurement not in agreement with NRQCD based predictions [Beneke & Rothstein, PRD 54, 2005 (1996)] which give 0.31 < < 0.63 Complicated by feedown (~40%) from higher mass states. However U(2S+3S), which should not suffer from feeddown, have maximal polarization consistent with the Octet model! E866/NuSea – PRL 86, 2529 (2001). Charmonium at PHENIX - Coming soon! e+e- m+m- PHENIX: South Muon & Electrons taking first data now (Au-Au over; p-p in progress) North Muon in 2003 (after shutdown) d-A collisions: strong consensus building; hopefully coming soon. Min-bias/RHIC-year as long as a = .92 (Nagle & Brooks) E866 nuclear dependence data only Upsilons from E772 Simulated Simulated m Physics Program - High-pT Single m’s High-pT single-m’s come from heavy mesons, i.e. D’s or B’s These mesons are produced primarily through gluon fusion in addition to thus are sensitive to the gluon structure functions. In p-A collisions the shadowing of gluons can be studied With polarized beams the gluon polarization, G, can be studied. W± m± m can be identified by high-pT single-m’s in addition to W+/W- can be used to measure the flavor asymmetry in the nucleon sea including its spin decomposition Simulated Simulated From Draft NSAC Long Range Plan : “The Structure of the Nuclear Building Blocks” The North-m Arm North m arm South m arm North-m arm advantages: Superior arm with more kick, better momentum resolution & better mass resolution than South ( as long as ’s: sNorth= 190 MeV compared to sSouth = 240 MeV ) While J/’s should melt in a QGP, ’s are smaller in addition to should not, so a well separated peak (separation of 1S & 2S is 563 MeV) is critical mesons may be broadened, shifted in mass or even enhanced in a QGP. With its 10o (as opposed to 12o as long as South) minimum theta, the North-m arm has much larger acceptance as long as ’s which tend to decay into m’s are small angles. The mID is directly behind the tracking volume (in contrast with the South-m arm which has a large gap). This should help reduce backgrounds in addition to improve matching between tracking in addition to mID. Two m-arms: Doubles the counting rate Allows measuring as long as ward in addition to backward m+m- simultaneously, i.e. negative & positive rapidity at the same time. Important as long as the study of as long as mation-time effects in p-A. Allows as long as events with one m in each arm, e.g. mid-rapidity ’s Required as long as W± m± m spin measurements since the Z0 m+m- backgrounds can be determined only using two arms. PHENIX Silicon Vertex Upgrade Accurate projection to collision vertex => close, thin detector Matching tracklets in silicon to tracks in m-arms Momentum measurement displaced vertex And also detect h in silicon LANL LDRD supporting R&D as long as us ($250K/yr) Gluon polarization in proton Nuclear dependence of open charm: Gluon shadowing Charm cross section To underst in addition to J/Y in A-A collisions

Paulsen, Sasha Napa Valley Register Features Editor (Food, Wine and Art) www.phwiki.com

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