Selected topics from the recent GLD studies

1
Selected topics from the recent GLD studies

• Akiya Miyamoto
• KEK
• 19 July, 2006
• GLD lunch time meeting
• At VCLW06

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Events since Bangalore

• GLD general meeting
• March 17, April 27, June 21
• Meeting logs available at http//ilcphys.kek.jp/me
  eting/lcdds
• Task forces
• PFA (Yoshioka)
• CAL Geometry Tower ? Dodecagonal
• DE/E 38/sqrt(E) ? 30/sqrt(E)
• Software issues discussed at weekly Jupiter
  meetings
• MDI ( Tauchi )
• Background studies and optimize IR design
• meet weekly since early June IR Options
• Tracking (?)
• Track finder of TPC, IT, VTX,
• GLD DOD
• V1.1 include DAQ, shape up figures (April 16)
• V1.2 a few corrections (July 13), submitted to
  hep-physics/0607154

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GLD Concept

• Large ECAL inner radius for optimal PFA,readout
  by Scintillator SiPM/MPPC for cost efficiency
• Large gaseous main tracker several layers of IT
  VTX
• Moderate B Field (3T)

Muon
Coil
HCAL
ECAL
TPC
4
Full Simulator updates
Talk by H.Ono

• A dodecagonal shape calorimeter was installed

1 module

• ECAL 33 layers of 3mmt W/2mmt Scint./1mmt Gap
• HCAL 46 layers of
• 20mmt Fe/5mmt Scint./1mmt Gap

• Readout cell
• 2cmx2cm (Default)
• 1cmx1cm ( studied in parallel )
• 1cmx5cm Need to develop a package to
  merge 1cmx1cm to a strip shape

10cm air gap as a readout space
5
A typical performance
Talk by H.Ono

• Differences between calibration constants of
  barrel and end cap calorimeter (10) is not
  corrected yet.

6
Cheated PFA

• Z? uds quark pair at 91.18GeV, no ISR, cosqlt0.8

• Results similar to the results by the previous
  geometry ( tower geometry )

7
Realistic PFA
By T.Yoshioka

• Preliminary result is comparable to the results
  by the tower geometry.
• Updated results will be presented during the
  VLCW06

Calibration near barrel/endcap Gap is not
optimized yet
8
ReconCheater
By M.Ronan, Vienna 2005

• Developed by US team, used to compare
  performances of detectotor concepts. GLD geometry
  as of Summer 2005 is defined.
• Simulated GEANT4 events can be fully
  reconstructed that uses Monte Carlo truth to
  reconstruct individual particles.

Track MC truth EMCAL from Deposited
energy HCAL parameterized as 60/Sqrt(E) ?
s2.1GeV for all detector models
Updated results will be presented by T.Barklow
at this WS.
9
Background reduction from VTX

• Discriminate background hits based on differences
  of cluter shapes for low Pt tracks and high Pt
  tracks

CCD
IP
Cluster Shapes for Low PT and High PT tracks
10
Hit reduction rate
By T.Nagamine

• Pair background can be reduced by using cluster
  shape by factor of 1/10 1/20 for z gt 1/2 Layer
  length

Pair background hits
Hits by 1 GeV/c m
Efficiency to keep hits
Before cut
After cut
98
Z position
Z position
11
MDI Issues

• Home page if GLD MDI task forcehttp//acfahep.kek
  .jp/subg/ir/bds/mdi/IR.task.force.htm
• See more details at http//agenda.kek.jp/askArchiv
  e.php?baseagendacatega06110ida06110s0t14/more
  info

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By T.Tauchi
13
(No Transcript)
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Geometries near IR

• By H. Fujishima

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Hit distribution at BCAL
2mrad
( no DID )
14mrad
Backgrounds in the case of larger crossing angle
This work is in progress Parameter optimization
is needed
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Experimental Hall

• Baseline
• Keep a space for construction / maintenanace
  while beam tuning isin proggress

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gg option

• Several discussions about gg option at meetings
  and mailing lists
• Opinion from experts are expressed to the lcdds
  mailing list.See the mailing archive at
  http//ilcphys.kek.jp/mail/archives/lcdds/200607/m
  sg00002.html

Breif summary
1) The Photon collider mode of the ILC will be
realized only when we encounter physics case that
only the photon collider (or photon electron
collider) can solves the puzzle. 2) It is too
soon consider physics case for 1) until LHC will
show us some hints 3) It is important to leave
possibility of options for the case that PHYSICS
needs it. We do not want loose physics
opportunities because we did not do something we
can do now for options. We also do not want to
loose opportunities with ee- because we stick
onto options too much. 4) Technical feasibility
of gg collider is not clear. Study should be
continued.
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Tracking

• Momentum resolution based on cheated PFA ( GLD
  DOD )

Track finders are yet to be developed !
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Common data sample (Jun06)

• Full simulation data sample for detector studies
• Data sets dec05, mar06, may06, jun06
• Links available at http//ilcphys.kek.jp/soft/
• A kind of data
• Single g, k0L, m, p0, e-, at 1 500 GeV 1K or
  10k events
• Ee- ? uds quarks pair, ccbar, bbar at 91.18,
  200, 350, 500, 10k-20k events
• Cain background data
• Ee- ? ZH ? lepton qqbar, 4-jet, 2-jet events
  at 350 GeV
• Producing data as much as possible. Statistics
  limited by CPU resources.
• Data with LCIO format are also available at the
  same web page.
• But, Pointers between objects are not fully
  compatible with LCIO yet. Development in
  progress
• International sharing of huge data samples is new
  a challenge. Considering to utilize a GRID
  infrastructure for LHC.

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Summary

• Studies of the GLD concept proceed slowly and
  steadily.
• Many issues remained to be studied
• PFA, MDI, Tracking, others (Muon, Physics
  benchmarks, )See summary at http//ilcphys.kek.
  jp/meeting/lcdds/archives/2006-03-17/