ILD Detector Optimization and Benchmarking Akiya Miyamoto, KEK at Tsinghua University 12-January-2009

ILD Detector Optimizationand

Benchmarking

Akiya Miyamoto, KEK

at Tsinghua University

12-January-2009

2Seminar at Tsuingha Univ., 12-Jan-2009

ILD Introduction

ILD origins in the European and Asian based Large Detector study.

Akiya Miyamoto, KEK

LDC GLD

ILC Reference Design (RDR) in 2007 GLD Detector Outline Document (DOD) arXiv:physics/0607154 LDC DOC http://www.ilcldc.org/Common feature: Tracker(Pixel & Silicon & Gas) + PFA calorimeter

+ …

At LCWS2007, we agreed to work together for a joint LOI GLD (B=3T, RECAL=2.1m) + LDC(B=4T, RECAL=1.6m ) ILD

http://www.ilcldc.org/


International Large Detector ( ILD )

LDC and GLD had a common future; Pixel vertex detector placed very close to the beam pipe. Gaseous tracker, TPC, for highly efficient and precise track

measurements,supplemented by silicon trackers.

EM and HD calorimeters are placed inside a solenoid field and read our by very small sensors to achieve a good energy measurement by Particle Flow Analysis (PFA).

Akiya Miyamoto, KEK

But in detail: B=4 Tesla(LDC) vs 3 Tesla(GLD) ECAL radius: 1.6m(LDC) vs 2.1m(GLD) Sub Detector technologies ….

Simulation studies of physics performances are used to reach agreement of detector parameters.


How we optimize

Optimization tools GLD Jupiter/Sattelites, LDC Mokka/MarlinReco intermediate detector models were introduced for comparison

GLDPrim by Jupiter, and LDCPrim by Mokka, both having B=3.5T and RECAL=1.85m.

Akiya Miyamoto, KEK

Performances have been studies as a function of major parameters.

Reached a consensus on the ILD reference detector for LOI benchmark studies at Cambridge (Sep. 2008).

Physics performance studies have been performed based on ILD model.


Jupiter/Satellites for Full Simulation Studies : GLD

JUPITERJLC Unified

Particle Interactionand

Tracking EmulatoR

IOInput/Outputmodule set

URANUS

LEDA

Monte-Calro Exact hits ToIntermediate Simulated output

Unified Reconstructionand

ANalysis Utility Set

Library Extention for

Data Analysis

METISSatellites

Geant4 basedSimulator

JSF/ROOT basedFramework

JSF: the analysis flow controller based on ROOT The release includes event generators, Quick Simulator, and simple event display

MC truth generator Event Reconstruction

Tools for simulation Tools For real data

Akiya Miyamoto, KEK


Mokka

− Mokka is a full simulation using Geant4 and a realistic description of a detector for the future linear collider.

− Home page: http://polzope.in2p3.fr:8081/MOKKA Mokka is now a part of the ilcsoft, http://ilcsoft.desy.de/portal/software_packages/

LDC

Akiya Miyamoto, KEK

ex. ECAL structure

− Detector Geometry: − managed by MySQL data base and

CGA (Common Geometry Access) API.− LDC and other variants are prepared

and used for ILD optimization.− Implementation of detailed detector

model based on engineering studies is in progress.

http://polzope.in2p3.fr:8081/MOKKA

http://ilcsoft.desy.de/portal/software_packages/

PandoraPFALCFIVertex

8

GLD + LDC Combined Framework

Akiya Miyamoto, KEKSeminar at Tsuingha Univ., 12-Jan-

2009

Whizard Physsim

StdHep

MOKKA Jupiter

LCIO

Marlin Sattelites

LCIO

DST and Analysis

LDC GLD

StdHep: Same generator dataLCIO: Common IO format GLDPrim/LDCPrim: Similar detector model

LCIO helps to collaborative works for detector optimization

After the LOI, two frameworkswill be merged to a single framework.


Detector Parameters for Opt. studies

GLD/GLDPrim/J4LDC prepared for Jupiter LDC/LDCPrim/LDCGLD prepared for Mokka Physics performance was compared between different

geometries

Akiya Miyamoto, KEK

Jupiter Mokka

GLD GLDPrim

J4LDC LDCGLD LDCPrim

LDC

B(T) 3.0 3.5 4.0 3.0 3.5 4.0

VTX Rmin (cm) 1.75 1.6 1.5 1.65 1.50 1.4

# VTX layers 3 x double super layers 5 layers

# IT layers 4 layers 2 layers

TPC Rmin(cm) 43.7 43.5 34.0 37.1

ECAL Rmin(cm) 210 185 160 202 182.5 161

HCAL Thick. (Int.L)

6.79 6.29 5.67 5.86Geometryiesin Mokka and Jupiter are similar, but there are many small differencesin geometry and assumed detector technologies


Pt resolution

Akiya Miyamoto, KEK

LDC : ~5% worse at high Pt Shorter Lever armGLD/GLD’: ~10%worse at low Pt Lower B

Single muon, produced at cosq=0. by Jupiter+Satellites: TPC+IT+VTX fitting


GLDPrim - LDCPrim

Akiya Miyamoto, KEK

LDCPrim(Mokka+Pandora) is better than GLDPrim(Jupiter+Sattelites) by 15~30%.

Possible source: srf(IT) 4mm(LDCPrim) 10mm(GLDPrim) Silicon External Tracker in Mokka 　　　

3x10-5

Sub-detector technology is more important than geometry

4mm


GLDPrim vs LDCPrim (srf(IP))

Akiya Miyamoto, KEK

GLDPrim is better than LDCPrim ;

3 double layers vs 5 layers ?

Fast sim. study by M.Berggren

srf=sZ=2.8mm


kaon_0L Energy Resolution

Akiya Miyamoto, KEK

Hadron Model: LCPhysics

HCAL response is not smooth around 13 GeV- LE/HE behaviour

ECAL resolution: same


Jet measurement: Particle Flow Analysis

Akiya Miyamoto, KEK

PFA: Charged particles by Tracker Neutral particles by Calorimeter, remove charged particle energies

Performance studies depend on shower simulation; longitudinal, lateral, and tof distribution, neutron response, etc.


Jupiter data analyzed by PandoraPFA

Akiya Miyamoto, KEK

Ejet(GeV)

Z pole uds-pair events:GLDPrim

Pandora PFA: Sophisticated algorithm tuned to Geant4 shower shape has achieved the performance goal of ILC, DE/E ~ 30%/√E

Jet Energy Resolution

16Akiya Miyamoto, KEKSeminar at Tsuingha Univ., 12-Jan-

2009

Same trend is seen by analysis of Jupiter models, though performance is slightly worse than Mokka model


ECAL Seg. and HCAL thickness

ILD: ECAL+HCAL= 6.8 Int. L.(48layers)6.8 Int. L look OK, but worse resolution is seen for 90o jets.

by M. THomson

−Performance is strong function of ECAL seg. size. −2x2cm2 too large, 1x1cm2 would be ok for jets with E < 100 GeV

Akiya Miyamoto, KEK


Physics Benchmark Studies

ILC goal precise studies of Tera scale physics.

Akiya Miyamoto, KEK

Signal processes: the minimum set. Recoil mass measurement by e+e- ZH e+e-/m+m- + H H c cbar decay in e+e- ZH process e+e- t tbar 6 jets and t (tbar) charge ID for AFB meas. e+e- t+ t- and t pol. measurement. Separate WW and ZZ in Chargino/Neutrino pair production process

According to the request by ILC Research Director (RD) and International Detector Advisory Group(IDAG), simulation studies for LOI should based on a realistic Monte Calro program based on a realistic reconstruction program include backgrounds by physics processes and those caused by

accelerator.


Higgs recoil mass meas.

e+e - ZH e+e-X / m+m-X , Ecm=250 GeV, 250 fb-1 Analysis.

Select e+e- / m+ m - consistent with Z and study recoil mass Precise track meas. is a key for

Akiya Miyamoto, KEK

GLDprim case, with backgound

e+e - Channel m+m- channel

Compare 3 geometries

m+m- X

Differences are small.

by Itoh Kazutoshi


Benchmark study: Example

Akiya Miyamoto, KEK

0 01 1

0 0 0 02 2 1 1

e e W W W W

e e ZZ

Using several detector models, performance to separate W/Z in jet mode have been studied using SUSY processes

by Taikan Suehara


e+e- t+t-, t rn

Akiya Miyamoto, KEK

t is polarized probe New Phyaics

SM

SM+NP

by Taikan Suehara


ILD reference detector model

At 2nd ILD WS at Cambridge, we agreed to created the new model,ILD reference design model for LOI, in Mokka:

Model parameters, B=3.5 Tesla Rin ECAL=185cm, TPC: halfZ=230cm VTX three double layers. Silicon trackers: ( SIT, FTD, SET, SOT) Calorimeters (ECAL 22X0, 0.5x0.5cm, HCAL ) ….

Akiya Miyamoto, KEK

for the sake of simulation, some detector technologies are assumed in Mokka. But as ILD, many detector technologies are open and not selected at the time of LOI.

By the time of LOI, we have no time to merge Jupiter/Sattelites and Mokka/Marlin framework. A work to merge two framework for “ILD Software” will come after LOI.

CAD Model

Mokka model


ILD_00 MC/DST production

ILD performance are expected to be similar to GLDPrim/LDCPrim. But for consistent and complete study, new MC&DST production has been lunched with an improved software.

Akiya Miyamoto, KEK

Started since Dec. last year, using GRID Goal: 250 fb-1 @ 250 GeV, 500 fb-1@500 GeV, Signal + SM

background StdHep (@SLAC) Sim(Mokka), reconstruction and DST maker. DST contents:

lcio format contains : Tracks, PFOs, [23456]-Jets,

LCFIVertex, MCParticls,.. Production profile:

Typical CPU time: ~0.5 min.(mm) to 4min.(6f) Typical event size ( for uds-pair @ 500 GeV )

Sim. ~950kb, Rec.~1800kb, DST ~ 23kb


ILD_00 MC/DST production

Akiya Miyamoto, KEK

Ecm

Signal Events NEvents

L [1/fb]

250 Sig1: ZH, Zee/mm 105k 4624

Sig2: ZH, Znn, Hqq 194k 1000

Sig3: ZH, Zqq, Hqq 567k 1000

500 Sig4: ee tt 2385k 517

Sig5: eettbbqqqq 1012k 3737

Sig6: eec+1c+

1, c02c0

2 137k 678

SM (250GeV)

NEvents

L [1/fb]

2f (w/o ee) 1314k 3.8

4f 10631k 772

6f 200k 3753k

ee 95k 0.0014

gg X 0 0

egeg 0 0

+nn ng 0 0

+gg ng 0 0

SM (500GeV)

NEvents

L [1/fb]

2f (w/o ee, tt) 760k 14.3

4f 2610k 42.4

6f (w/o bbqqqq)

624k 1221

ee 0 0.0

gg X 544k 3560

egeg 0 0

+nn ng 0 0

+gg ng 0 0

@ last week

Rough summary: ~ 23M eventsO(50) TB Sim/Rec. files~ 0.5 TB DSTs so far

Production continues


GRID for MC production

GRID provides Huge CPU and storage resources A way to communicate world wide

VO ILC is hosted by DESY, based on LHC Computing GRID MC production and production are running on GRID Simulated, Reconstructed, and DST are placed on GRID.

DST: 20~50 MB x O(10k) files or more.

In Japan, Replications of DST to KEK/Tohoku/Kobe U.

sites are in progress in parallel to the production. Resources in KEK will be increased in near

feature.

Akiya Miyamoto, KEK

Grid

KEK

DESYIP2P3

UK

more …


Summary

ILD has been optimized

ILD MC and DST production is in progress, for performance studies of LOI 3rd Workshop will be held at Seoul in Feb 16-18, LOI is due March 31. Presented at TILC09 ( 17-21, April ) Detector TDR phase will follow.

Many physics channels are yet to be analyzed. Your participations are welcomed.

Akiya Miyamoto, KEK

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ILD Detector Optimization and Benchmarking Akiya Miyamoto, KEK at Tsinghua University 12-January-2009