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Simulations: resolution, occupancy, …, for the barrel

Simulations: resolution, occupancy, …, for the barrel. Silicon upgrade workshop in Nashville June 9, 2003 Yuji Goto (RIKEN/RBRC). Physics goals of silicon vertex detector. heavy-ion physics modification of gluon structure in nuclei gluon shadowing

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Simulations: resolution, occupancy, …, for the barrel

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  1. Simulations:resolution, occupancy, …,for the barrel Silicon upgrade workshop in Nashville June 9, 2003 Yuji Goto (RIKEN/RBRC)

  2. Physics goals of silicon vertex detector • heavy-ion physics • modification of gluon structure in nuclei • gluon shadowing • properties of earliest, densest stage of Au+Au • charm enhancement • charm baseline for J/y suppression • energy-loss of high-pT heavy quarks • spin physics • gluon polarization in broad xBj range • prompt photon + jet production: gluon Compton process • heavy flavor production: gluon fusion process • flavor contents of quark polarization • weak boson production • transversity • particle correlation Yuji Goto (RIKEN/RBRC)

  3. Strawman Yuji Goto (RIKEN/RBRC)

  4. xG(x) xG(x) baseline upgrade barrel baseline upgrade endcap GS95 GS95 photon+jet prompt photon cceX cc(displaced)X cce(displaced)X ccDX bbeX bbeX bbe/+displaced bbe/+displaced BJ/X BJ/X J/ J/ee XBj coverage before and after … • figure for the LoI presentation in March … • s = 200 GeV, full luminosity 320 pb-1 • S/N > 1 • statistics: #event > 100-1000 Yuji Goto (RIKEN/RBRC)

  5. S/N will improve … ? S/N > 1 for pT > 5 GeV/c after isolation cut xgluon = 2pT / s > 0.05 jet-axis resolution ? kinematic reconstruction how much advantage ? improvement of isolation cut ? Photon+jet measurement inclusive  inclusive  xg calculated by xg=2pT/s  + leading hadron xg calculated by kinematic reconstruction Yuji Goto (RIKEN/RBRC)

  6. Sum Dalitz Charm Beauty 1 2 3 4 5 6 7 pT(e) (GeV/c) Single-electron measurement • mid-rapidity sources of electron … • remove Dalitz via vertex cut • charm pT(e) < 3 GeV/c • beauty pT(e) > 3 GeV/c by Vladimir Rykov Yuji Goto (RIKEN/RBRC)

  7. e-track dca collision vertex Electron DCA resolution • 50mm x 425mm pixels, full multiple scattering • DCA resolution (electrons) < 50 mm at moderate pT • less than c, D0: 125mm, D: 317 mm by Johann Heuser Yuji Goto (RIKEN/RBRC)

  8. cceX • S/N will improve by displaced vertex identification … • baseline: pT = 2-4 GeV/c xgluon = 0.05-0.1 • upgrade: pT = 1-4 GeV/c xgluon = 0.01-0.1 by Wei Xie Yuji Goto (RIKEN/RBRC)

  9. ccDX • pT > 4 GeV/c xgluon > 0.1 • triggering ? by Iowa group D+K-p+ p+(BR 9%) Lc D0Kp p+p 30k/year Au+Au 10K/year Yuji Goto (RIKEN/RBRC)

  10. bbe/+displaced-vertex • statistics will improve … • 30 times larger statistics • baseline: xgluon = 0.04-0.15 • upgrade: xgluon = 0.02-0.3 • triggering is necessary … Yuji Goto (RIKEN/RBRC)

  11. BJ/+X • J/ee • baseline: xgluon = 0.02-0.06 • BJ/ee • upgrade: xgluon = 0.03-0.1 or narrower J/ BJ/ Yuji Goto (RIKEN/RBRC)

  12. More studies to do … • resolution, occupancy, … • how much occupancy in the heavy-ion environment realistically ? • how to survive it  pattern recognition, tracking, … • matching to central arms • jet-axis resolution ? • S/N, statistics, how to pin-down xgluon, … • others … • triggering • s = 500 GeV • other channels: bbeX, … Yuji Goto (RIKEN/RBRC)

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