Eunil Won/Korea U1 A study of configuration for silicon based Intermediate Trackers (IT) July Eunil Won Korea University

Eunil Won/Korea U2 Outline GLD software/simulation activity in Korea Configuration optimization of barrel IT Endcap IT – first thought

Eunil Won/Korea U3 Software/Simulation A. Miyamoto visited Korea and gave 2 days tutorials (02-Jun ~ 03-Jun) - ~10 participants from Korea - Event generation/fast sim./full sim. (Geant4) Now we are at the end-user level and slowly moving forward to be developers (ex: full sim. analysis now can deal with data with calorimeter off. J.Lee) All the plots I show today are based on his tutorials (thanks to A. Miyamoto)

Eunil Won/Korea U4 Roles of IT (Barrel) Improve momentum resolution by adding high precision points at large distance from IP (between VTX and TPC) Help pattern recognition in linking the tracks from TPC to VTX Help in the efficient reconstruction of long lived particles

Eunil Won/Korea U5 Recoil Mass (GeV) LCWS05 (Tim Barklow) The performance of tracking detectors can ultimately be tested from - recoil mass distribution of ee  ZH Recoil Mass (GeV)

Eunil Won/Korea U6 GLD Default Geometry (vtx/tracking only) IT (as in gld_v1.dat and C++ codes): spatial resolution 10  m 4 layers (561  m Silicon strip) r=9 cm (innermost), 30 cm (outermost) half z = 18.5 cm (innermost), 62 cm (outermost) |cos  |<0.9 CAD drawing by S.K.Park TPC

Eunil Won/Korea U7 With and W/O IT H. Ha Without IT: 3.9 x (GeV) -1 (high momentum limit) With IT: 4.4 x (GeV) -1 default goal(?): 5x10 -5 (GeV) -1 Geant4/single (cos  =0)  /p T 2 (GeV) -1 TPC only TPC+VTX TPC+IT+VTX  /p T 2 sampling term multiple scattering term TPC only10.9 x x TPC+VTX4.37 x x TPC+IT+VTX3.87 x x GeV

Eunil Won/Korea U8 Number of layers vs. resolution H. Ha Geant4/single (cos  =0)  /p T 2 (GeV) -1 2 layer option 4 layer (default) 5 layer 4 layer (default) is probably enough?

Eunil Won/Korea U9 We also tried... Varying position resolution (10  m to 20  m) outermost 37 cm changing the thickness from 561  m to 300  m and checked the momentum resolution, but did not find significant changes So far, the default configuration seems to be good (caution: at the level of the study with single muons)

Eunil Won/Korea U10 e+e-  ZH, ZZ Study (ongoing) Y.I.Kim ee  ZH GLD default configuration - input m H = 120 GeV + PYTHIA + Geant4 ee  ZZ We have been (and will be) working on roles of IT in terms of physics...

Eunil Won/Korea U11 Endcap Option Do we need it? If so, how many layers? What type of sensors? Where do we want to put them? I’ll not be answering questions on the above today but will list questions and things to do... At present, we do not have endcap trackers

Eunil Won/Korea U12 Physics and endcap detectors LCWS05 (Tim Barklow) e+/- veto down to 3.2 mrad in presence of very large e+e- pair background Useful in general to suppress   ff background. Takes on added importance given that the SUSY parameter space consistent with Dark Matter density includes region with nearly degenerate

Eunil Won/Korea U13 Tesla Option (from Tesla TDR) Three innermost layers: pixels Four outer layers: strip Endcap covers down to 7 o (GLD barrel IT covers down to 25.8 o )

Eunil Won/Korea U14 GLD Geometry (as in gld_v1.dat, maybe partially) CAD drawing by S.K.Park 260 cm (150 cm for TESLA) TPC IT VTX Endcap Calorimeter Is this completely empty? signal cables support structure?

Eunil Won/Korea U15 Cross sectional View (GLD, zoomed) option 1 : change barrel IT (same length) : H. Park option 2 : Tesla-like version? CAD drawing by S.K.Park

Eunil Won/Korea U16 Cross sectional View (GLD, zoomed) option 1 : change barrel IT (same length) : H. Park option 2 : Tesla-like version? CAD drawing by S.K.Park

Eunil Won/Korea U17 Z (cm)R (cm) Layer Layer Layer Layer Layer Layer Layer CAD drawing by S.K.Park/H. Park (Tesla-like version)

Eunil Won/Korea U18 Works to be done for Endcap R&D Should it be a mixture of pixel and strip? (similar to Tesla) Have endcap IT in the simulation software - software organization) Study the best configuration for endcap IT - number of layers - geometry (change of barrel IT design needed?) Radiation hardness ? (requires background study)

Eunil Won/Korea U19 Summary Understanding of simulation software for IT R&D in good progress Baseline barrel IT configuration seems OK Endcap IT design under consideration