Snowmass2005 report

1
Snowmass2005 report

• 2005/09/26
• H. Matsunaga
• GLDCAL meeting

2
Snowmass05

• A joint workshop
• Second ILC workshop (Accelerator)
• ALCPG workshop (Physics and Detector)
• American regional -gt World-wide
• http//alcpg2005.colorado.edu/
• Snowmass, Colorado
• Altitude 2500 m
• Two weeks 8/14 8/27
• Sort of real workshop
• 600 participants
• 60 persons from Japan

3
Snowmass
4
Sessions

• Many plenary and parallel sessions
• Accelerator
• Detector
• Physics
• Education Outreach
• (Private communication/discussion)
• Detector sessions
• Detector components
• CAL, SIM, MDI, MUON/PID, PFA, Test beams, TRK,
  VTX
• Concept studies
• GLD, LDC, SID

5
Special sessions etc.

• Accelerator Seminars/Tutorials
• Physics Benchmarks
• Industrial Forum
• Special Evening Forum Challenges for Realizing
  the ILC Funding, Regionalism, and the
  International Collaboration
• Views from ICFA, HEPAP, DOE, NSF, Asia, FALC,
  Europe,
• Public Lectures (Y-K. Kim, H. Murayama)
• Concepts Groups meet with WWS RD panel
• Case for 2 Detectors
• Cosmology and ILC
• LHC-ILC

6
Accelerator part

• Working Groups (WG 1, 2, 3a, 3b, 4, 5, 6)
• Formed Global Groups (GG 1, 2, 3, 4, 5, 6)
• BCD (Baseline Configuration Document) by the end
  of 2005
• Good summary by Yokoya-san at the recent JPS

7
Fourth Concept

• Fourth concept was proposed
• John Hauptman, Richard Wigmans et al.
• Compensating CAL not PFA-directed
• 20/vE for e, hadron and even jets
• Dual fiber readout Scintillation Cherenkov
• Correct EM fraction event-by-event
• How to construct 4p detector ?

8
Detector session

• Main focus on PFA (Particle Flow Algorithms)
• PFA plenary session
• No group has achieved the goal of 30/vE for jets
• Still need a lot of work to obtain definite
  answer
• Next four pages are taken from Jean-Claude
  Brients talk
• May need more detailed study (tracking etc.)

9
?EJ a?vEJ ? b?EJ c
the energy resolution
a b c (GeV)
ALEPH Method quasi-PFA 0.59 0 0.6
ATLAS 0.6 0.03 0
H1 0.5 0.05 0
PFLOW-ILC 0.3 0 0.5
Essentially already given by A.Raspereza on LDC
the Angular Dependence !!
ALEPH , a0.8 in end-cap ATLAS , a1.2 in
end-cap etc
Why the value of b is so important !! (and why a
calorimetric approach is not the solution)
NIM A360 (1994),480
10
JCB
Real data
H1
ATLAS
ALEPH
?Ejet ( GeV)
?
Depends on Granularity and Physics process (jet
mul., vs)
Goal for PFA-ILC
?confusion
?threshold
Ejet ( GeV)
NIM A360 (1994),480
11
Fraction of the photon(s) energy per event ,
closer to a charged track than some distance
1.5 x pad size is needed for photon reconstruction
Fraction
Distance in cm
12
Measurement Directly related To the TOTAL WIDTH
Of the Higgs !!!
8 to 10 of the energy !!
Region for LDC, SiD
13
Pad size is more important than Moliere radius

• 1x1 mm2 pad size
• 21 and 17 GeV at 1.2cm apart
• For tau decays, granularity may be most important
  than quark/gluon jets

By H. Videau (and J-C. Brient)
14
Granularity Study
By T. Yoshioka

• Different granularity
• is tested.
• - So far, no gain with
• finer segmentation.
• (under study)

Default segmentation
This results are due to production on Z-pole ?
15
CAL session

• Three concepts fourth (DREAM) by R. Wigmans
• Still many proposals
• Comparison session
• Silicon-based ECAL
• Sci.-based ECAL
• RPC-based HCAL
• GEM-based HCAL
• Sci.-based HCAL

16
CALICE Tile-HCAL

• Talk by Felix Sefkow
• Scintillator Tile SiPM
• Already used in their Minical
• Construct HCAL module for testbeam
• Using thousand SiPM
• Established mass production and quality control
  scheme
• Frontend electronics

17
Misc.

• Need to validate the feasibility of orthogonal
  strip readout
• Discussed with Patrick le Du for Front-end
  electronics
• Detector outline document due end of February
  2006
• Detector CDR due end of 2006
• Testbeam around 2007?
• http//www.linearcollider.org/cms/
• Upcoming meeting etc.
• ECFA ILC workshop, Vienna, Austria, 14-17
  November 2005
• LCWS 2006, Bangalore, India, 9-15 March 2006