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Immaculateness of appeal/magnificence applicants with DCA cuts. immaculateness has a noteworthy effect how well DG(x) can be measured. How compelling DCA cuts for a given pillar spot size ...

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Reenactment issue Y. Akiba

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Main objectives expressed in LOI Measurement of appeal and excellence utilizing DCA as a part of barrel c ��  e + X D ��  K p , K pp , and so on b ��  e + X B ��  J/y ��  ee Measurement of Jets in barrel Reconstruction of "planes" from charged tracks in barrel Measurement of appeal and magnificence utilizing DCA as a part of end-top c ��  m + X b ��  m + X B ��  J/y ��  mm Physics objectives Au+Au: Probing hot thick matter utilizing overwhelming quarks d +Au: Measurement of gluon shadowing in little x p+p : Measurement of D G(x) in wide x go

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Strawman Design 1.5% X/X 0 for every layer b) 1 st layer as near bar pipe as could reasonably be expected c) depend on PHENIX focal + muon arms for PID, force d) 4 layers => precise, repetitive DCA

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Critical Questions How much transformation foundation the Si indicator will produce to the focal arm? Consequences for LVL1 trigger on p+p "thick converter" information in RUN-3 may give the answer Effects on disconnected investigation RICH inhabitance Single electron foundation Di-electron foundation How well "outer tracks" can be associated with the tracks in SVT Central arm track to SVT barrel Muon arm track to SVT end-top Purity of appeal/magnificence applicants with DCA cuts immaculateness has a noteworthy effect how well D G(x) can be measured How successful DCA cuts for a given bar spot estimate Present bar spot size of RHIC s x ~ s y ~ 500 m. This is bigger or equivalent to ct of D0(123 m ), D+(315 m ), B0(462 m ), and B+(502 m ). Pillar measure in RHIC-II will be littler ( s ~ 150 m ?) These inquiries ought to be replied at any rate by exceptionally practical reproduction

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Background issue Effective radiation length in present PHENIX: 0.8%(Dalitz)+0.3%(beam pipe)+1%(MVD) = 2.1% 1.1 % without MVD (a conceivable arrangement in RUN-4) Effective radiation length with SVT 0.8%(Dalitz)+0.3%(beam pipe)+4 × 1.5%(Si)+0.3%(?)(Enclosure)=7.4% 1.4 to 1.8 % if change electron in the SVT is expelled by requiring a hit in the inward most layer of the SVT. Here I expect that Si sensor part is put in the inward 50% of the Si layer. Exceptional relationship of electron track and SVT track is required If the transformation in the SVT are not evacuated by offiline ��  Combinatorial foundation of di-electron sets will increment by an element of > 10. This will makes low mass estimation unimaginable, and this will truly bargain the estimation of J/Y and y (2S) in the most focal crash. The foundation can struggle another overhaul arrange (TPC+HBD) This question of the transformation foundation ought to be illuminated in CDR

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Example: affect on J/Y RUN-2 Au+Au (0-20%) (7/m b of information) Background: ~40 numbers Signal: < 10 (90%CL) Expected flag is 10% to 70% of as far as possible. See left plot Au+Au�� J/Y �� ee in RUN-4 ~300/ub in RUN-4 Combinatorial Background can be decreased by half with smaller mass cut ��  Background: ~ 900 (with thin mass cut) Signal: <40 (QGP concealment) ~270 (factual model) PHENIX likely needs to proceed with J/Y estimation past RUN-4. On the off chance that change from SVT is not expelled, this estimation turns out to be exceptionally troublesome. Demonstrate that the foundation from SVT does not bargain the J/Y estimation

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What are should have been done Realistic execution of SVT geometry and material in PISA Implementation of SVT reaction chain in PISA Efficiency Noise level Local track reproduction code for recreated SVT Global following (SVT track ��  DC track (PHENIX reco track)) New reenactment remaking code ought to be actualized as another classes of PHENIX reproduction code Simulation investigation of Full Hijing occasion or parameterized Au+Au occasion p+p occasion with practical vertex conveyance ( s r ~ 500 m, s z ~ 30 cm) Study of Reconstruction effectiveness Di-electron foundation (after SVT following) DCA determination Purity of appeal/excellence track hopeful "Stream" remaking in SVT

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aloof segments 290µm 150 to 200µm PIXELS DETECTOR READOUT CHIP 150 to 200µm cooling carbon fiber bolster More detaled rundown Structures like appeared in the privilege ought to be actualized in PISA New "GHIT" from SVT (one each for Si pixel, Si strip, and Si end top) New class accordingly chain that produces new (adjusted) "HIT" from "GHIT" and connection table between them for Si pixel, Si strip, and Si end-top Geometry protests that portrays SVT geometry in reco chain SVT barrel nearby following class (barrel HIT ��  barrel track) Barrel track ��  focal arm track worldwide following class SVT end top neighborhood following class (end top HIT ��  end top track) End top track ��  muon track worldwide following class All code ought to be executed in the present system of PISA and PHENIX recreation/examination chain

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Very unpleasant evaluations of labor and time Man control requirement for programming advancement PISA geometry usage: 1 to 2 man month (committed) PISA reaction chain: 1 to 2 man month (devoted) SVT nearby following and Global following Barrel + focal tracks: 2-3 man months least End-top + muon arm track: 2-3 man months least Need volunteer for the work: 1-2 man for PISA geometry + reaction chain 1-2 man each to track for (barrel+central) and (end-cap+muon) 1 Coordinator of the exertion If we begin solid exertion on the reproduction/recreation extend, the principal variant of programming can be accessible by end of summer Simulation generation RUN (>1 month, in Fall 2003?) 100K Au+Au focal occasions (10 min/occasion?) ��  1 weeks x 100 CPU 100K Au+Au min. inclination occasions (3 min/occasion?) ��  a couple days x 100 CPU 1M p+p enchant/magnificence occasions Real time can be longer by variable 2 to 3 Analysis of completely recreated occasions (>1 months. Tumble to winter 2003)

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Summary There are a few, unanswered, basic inquiries on SVT Performance in focal Au+Au impacts Conversion foundation and its impact to electron combine estimation Compatibility with TPC/HBD extend They should have been replied (in any event) by an extremely sensible recreation and remaking of the mimicked information. This is a noteworthy exertion, and requires > half year of concentrated exertion of a few committed individuals. Need to begin now to get result before the end of year.