LCWS 2004

19 Apr 2004, 09:00 → 23 Apr 2004, 16:05 Europe/Zurich

Le Carré des Sciences, Paris- France

This "Colloque" is the 7th in the Worldwide LCWS series which started at Saariselka, Finland in 1991, continuing in Waikoloa, Hawaii; Morioka-Appi, Japan; Sitges, Spain; Fermilab, USA; and Jeju, Korea. These workshop-style conferences have been the main international forum for developing the physics case and reviewing detector designs and techniques for a linear collider programme in the energy range up to ~1 TeV. LCWS 2004 takes place while the International Technology Recommendation Panel is meeting to decide between the "warm" and "cold" accelerator technologies. Following their recommendation a Global Design Team will be started and preparations will begin for the bid to governments for full funding.

Program Committee: Jim Brau, David Miller, Hitoshi Yamamoto(Co-chairs) Paul Grannis,John Jaros, Dean Karlen, Mark Oreglia, Ritchie Patterson, Akiya Miyamoto, Yoshiaki Fujii, JooSang Kang, ChangGen Yang, Wei-Shu Hou, Tiziano Camporesi, Michael Danilov,Rolf Heuer, Marcello Piccolo, Francois Richard, Ron Settles, Henri Videau.

Local Organizing Committee: Jean-Claude Brient, Pierre Lutz, Francois Richard, Aurore Savoy Navarro, Dominique Schiff , Henri Videau (chair)

Monday 19 April

09:30 → 12:35 Plenary Session

09:30 Welcome address

09:45 Charge to the Colloque

Speaker: Jim Brau (Univ. of Oregon)

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10:15 Theoretical introduction

Speaker: John Ellis (CERN)

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10:55 coffee break

11:25 Experimental Introduction

Speaker: Raymond Frey (Univ. of Oregon)

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12:05 Detector technologies

Speaker: Hitoshi Yamamoto (Tohoku Univ.)

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12:35 → 14:00

12:35 LUNCH

14:00 → 20:00 Plenary session

14:00 Synergy between LHC and LC

Speaker: Rohini Godbole

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14:30 Present Status of R&D for the warm linacs (X and C band)

Speaker: Kiyoshi Kubo (KEK) & Tom Markiewicz (SLAC)

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15:20 Present Status of R&D for the Superconducting linac

Speaker: Carlo Pagani (INFN Milano and DESY)

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16:00 Present Status of R&D for CLIC

Speaker: Jean-Pierre Delahaye (CERN)

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16:40 collation

17:10 Introduction to the US Technology Options Report

click here for a full report

Speaker: Gerald Dugan (Cornell Univ.)

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17:30 Some European thoughts on technology options

Speaker: A. Wagner (DESY)

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17:50 Report from the International Linear Collider Steering committee

Speaker: Maury Tigner (Cornell Univ.)

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19:00 Welcome cocktail at the Palais de la Decouverte

Tuesday 20 April

08:30 → 10:00 Accelerator Physics topics

Conveners:R. Patterson, G.Blair, T. Nakanishi

08:30 The EUROTeV Initiative

More than 20 European laboratories have joined forces on a Design Study for the Linear Collider in the TeV range. In a bid submitted to the European Union the consortium tries to gain support to address some of the remaining high ranking issues identified in the report of the TRC. It is expected that these studies will be complemented by similar activies in Asia and in the Americas. The talk will give an overview of the topics tackled in this study.

Speaker: Elsen, E. (DESY)

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08:50 Reliability Evaluation for the US LC Study

One charge to the US LC Technology Options Study was to evaluate the projected availability of the warm and cold LC designs and indicate the effort required to meet specified goals. A Monte Carlo simulation was developed which estimated availability based on device counts, frequency of failure (MTTF) and time to repair (MTTR). The simulation included device accessibility, tunnel access and beam recovery times, and time for machine development studies. The study also considered the impact of 1 vs 2 tunnels, and the benefit of a conventional positron source for either design.

Speaker: Gerald Dugan (Cornell Univ.)

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09:05 Risk Evaluation for the US LC Study

As part of the US LC Technology Options Study, a risk analysis was performed to identify aspects of the warm and cold designs where there was significant risk that the LC might fail to achieve its energy, luminosity or availability goals. The study identified 42 items and assigned each of these a rank for likelihood, severity, time of discovery and impact. This pointed to which sub-systems of each design pose the greatest risk.

Speaker: Gerald Dugan (Cornell Univ.)

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09:25 GLCTA and C & X Options

GLCTA (Global Linear Collider Test Accelerator) is a facility to demonstrate that we are ready to build a linear collider with a warm technology. It is a great and important step to realize the LC project. We have built the GLCTA at KEK and just started a high-power test of an X-band accelerating structure. In the near future,we will accelerate an ultra low-emittance beam from the ATF. It should be a good and direct demonstration of the GLC accelerator complex. C-band accelerator has succeeded in accelerating a beam at the injector of KEKB. In the early stage of the LC, C-band technology may be the best technology because of its simplicity and reliability. To reach 1TeV or higher energy, however, X-band technology is indispensable. We have studied to operate both C-band and X-band simultaneously in LC main linac. I will report on the status and future prospects of the GLCTA and C+X option.

Speaker: Sanuki, T. (Univ. of Tokyo)

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09:40 The Fermilab LC R&D Program

Fermilab is the only laboratory in the US Laboratory that is collaborating on both warm (NLC) and SRF (TESLA) linear collider technology R&D. Fermilab's contributions and plans to these accelerator hardware R&D will be discussed. New initiatives in the accelerator physics, ground motion etc. at Fermilab will be presented. A proposal and scope of a next generation Linear Collider Engineering Test Facility will be discussed.

Speaker: Mishra, S. (FNAL)

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08:30 → 12:00 Higgs and EWSB

Conveners: Rick Van Kooten, Howard Haber, Klaus Desch, Satoru Yamashita

08:30 Higgs Theory Overview

Speaker: Howard Haber (University of California, Santa Cruz)

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08:55 Radiaitve Corrections to nu nu H and ttH

Speaker: Stefan Dittmaier (MPI, Munich)

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09:20 Beam Related Systematics in the Measurement of the Higgs Boson Mass

Speaker: Alexei Raspereza (DESY, Hamburg)

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09:40 Hadronic Branching ratio of a SM-like Higgs boson at a future linerar collider

Speaker: Thorsten Kuhl (DESY, Hamburg)

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10:00 Coffee Break

10:20 Higgs Branching Fractions at 1 TeV

Speaker: Timothy Barklow (SLAC)

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10:45 The Importance of W-->qq Resolution

Speaker: John Hauptman (Iowa State University)

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11:05 Simulation of ttH and extraction of top Yukawa coupling

Speaker: Auguste Besson (IReS - Strasbourg)

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11:20 New Physics from Higgs self-coupling measurement

Speaker: Yasuhiro Okada (KEK)

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11:45 A study of self-coupling measurement at about 1 TeV

Speaker: Satoru Yamashita (University of Tokyo, ICEPP)

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08:30 → 10:05 New physics at TEV scale and precision EW studies

Conveners:G. Wilson, J. Hewett, K. Moenig, K. Ruckl, K. Hikasa,S. Raychaudhuri

08:30 How to study weakly coupled neutral vector bosons

Speaker: Ayres Freitas (Fermilab)

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08:50 Aspects of new gauge boson searches at LHC/LC

Speaker: Sabine Riemann (DESY Zeuthen)

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09:10 The Non-Commutative Standard Model at a Photon Collider

Speaker: Juergen Reuter (Karlsruhe)

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09:30 Using radiated photons to tag new physics

Speaker: Sreerup Raychaudhuri (Indian Inst. Tech., Kanpur)

09:50 Charge asymmetry in gg -> l+l-,neutr. with polarized photons

Speaker: Ilya Ginzburg (Sobolev Inst)

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08:30 → 09:55 Simulation: General Frameworks

Conveners: M. Peskin, D. Ward, K. Fujii

08:30 LCIO - Persistency and Data Model for LC Simulation and Reconstruction

Speaker: Dr Frank Gaede (DESY IT)

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08:55 Software tools for GLC studies

Speaker: Akiya Miyamoto (KEK)

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09:10 A Hybrid MC system

Speaker: Mike Ronan (Berkeley)

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09:25 Status of Brahms and Simdet

Speaker: Harald Vogt (DESY Zeuthen)

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09:40 LELAPS: A fast simulation tool for LC studies

Speaker: Michael Peskin (for Willy Langeveld) (SLAC)

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08:30 → 10:00 Top and QCD

Conveners:P. Burrows, A. Brandenburg, L. Orr, S. Rindani

08:30 Status of NNLO 3-jet Calculations

The process e+ e- -> 3 jets offers the opportunity to measure the strong coupling constant. For an accurate determination, precise theoretical calculations are necessary. I will give an overview on the status of the next-to-next-to-leading order calculations.

Speaker: Weinzierl,S. (MPI, Munich)

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08:55 Luminosity Spectra and the Top Threshold

Speaker: Boogert, S. (UCL)

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09:20 Impacts of a Precise Top Mass Measurement

Speaker: Weiglein, G. (IPPP, Durham)

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10:00 → 10:30

10:00 coffee break

10:30 → 12:00 Global Detector Network

Conveners: Joachim Mnich, Mike Hildreth, Rick van Kooten, Kejsuke Fujii, Vaclav Vrba

10:30 Summary of previous GDN workshops

Speaker: Joachim Mnich (Deutsches Elektronen Synchrotron (DESY))

10:45 Data acquisition in the GDN

Speaker: Eckerlin, G. (DESY)

11:00 Experience with D0 remote shifts

Speaker: Le Du, P. (Saclay)

11:15 Discussion

10:30 → 12:00 Machine-Detector interface

Conveners: T. Tauchi, M. Woods, P. Bambade

10:30 Welcome and presentation of agenda

Speaker: Bambade, P. (LAL-Orsay)

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10:35 Summary of crossing-angle January 19 workshop

Including some updates and cross-references to relevant talks in SUSY session and by Lohmann, Drugakov and Hauptman

Speaker: Bambade, P. (LAL-Orsay)

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10:50 Alternative IR geometries for TESLA with small crossing angles (A. vertical, B. horizontal)

Includes a few slides contributed by Bambade, Mouton and Napoly for point B

Speaker: Appleby, R (Daresbury)

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11:05 Study of beam background at GLC including estimation by the BDS simulation from the exit of the LINAC to the beam dump

Includes contributions from Aihara and comments on the extraction line design

Speaker: Aso, T. (Toyama National College)

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11:20 Beam-induced background calculation in TESLA with l*=4.1m optics and description of new masking scheme with/without 2*10mrad crossing-angle

Speaker: Stahl, A. (for Büsser, K.) (DESY)

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11:35 IR Design (collimation, backgrounds, crossing angle)

Includes some summarizing comments on the different crossing-angle schemes

Speaker: Markiewicz, T. (SLAC)

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10:30 → 12:10 Simulation :Reconstruction

Conveners: M. Peskin, D. Ward, K. Fujii

10:30 Flavour Tagging performance analysis for vertex detectors

Speaker: Sonja Hillert (Oxford)

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10:45 Vertex Reconstruction Toolkit and Interface to Generic Objects (VERTIGO)

Speaker: Dr Winfried Mitaroff (AUSTRIAN ACADEMY OF SCIENCES // INSTITUTE OF HIGH ENERGY PHYSICS)

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11:00 Cluster finding in CALICE calorimeters

Speaker: Chris Ainsley (Cambridge)

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11:15 Calorimeter clustering with minimal spanning trees

Speaker: Georgios Mavromanolakis (Cambridge)

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11:25 Performance studies and particle flow algorithm using GEM HCAL

Speaker: Andy White (p.p. Jae Yu) (Texas at Arlington)

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11:40 Full Simulation and Reconstraction Analysis with Brahms (G3)

Speaker: Valeri Saveliev (DESY)

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11:50 GEANT4-based full-detector and Test Beam simulation

Speaker: Dhiman Chakraborty (Northern Illinios)

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12:00 Two particle separation using tile HCAL

Speaker: Alexei Raspereza (DESY)

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10:30 → 12:10 gamma-gamma, e-gamma

Conveners: T. Takahashi, J. Gronberg, M. Krawcyk

10:30 Brief Report on Technology from Asia

Speaker: Takahashi, T.

10:40 Status of the MERCURY laser

Speaker: Gronberg, J.

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10:50 Brief Report on Technology from Europe

Speaker: Moenig, K.

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11:00 Total cross-sections: cross-talk between HERA, LHC and LC

Speaker: Pancheri, G.

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11:15 New-Physics Search in gammagamma -> tbar{t}

Speaker: Hioki, Z.

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11:30 Some beyond SM physics at gamma-gamma colliders

Speaker: Cheung, K.

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11:45 Comparison of warm and cold photon colliders

Speaker: Telnov, V.

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12:00 Study of PLC Beam Dump

Speaker: Telnov, V.

12:00 → 13:30

12:00 LUNCH

13:30 → 15:00 Calorimetry and muons

Conveners: J.C.Brient , D.Chakraborty, K.Kawagoe, M.Piccolo

13:30 LC muon detector: An update of the ECFA studies

Speaker: M. Piccolo (INFN-LNF)

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13:50 R&D for RPC detector

Speaker: T. Tabarelli de Fatis (Univ. Milano)

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14:10 Muon and particle Id.

Speaker: G. Fisk (FNAL)

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14:30 Review of the forward calorimetry

Speaker: L. Zawiejski (INP Cracow)

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13:30 → 15:00 Loop calculations

Conveners: J.Fujimoto, U.Baur, S.Dittmaier

13:30 Recent Results on Sudakov Logarithms in Electroweak Processes

Speaker: Kuehn, J. (Karlsruhe)

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13:50 Electroweak Logarithms at Two Loops

Speaker: Pozzorini, S. (Karlsruhe)

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14:10 Recursive Numerical Calculus of One-loop Tensor Integrals

Speaker: Pittau, R. (INFN Torino)

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14:35 Electroweak Corrections to Deep Inelastic Neutrino Scattering

Speaker: Arbuzov, A. (Dubna)

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13:30 → 05:50 Polarization

Conveners: Gudrid Moortgat-Pick, Tsunehiko Omori, Mike Woods

13:30 Physics Motivation for polarised e- and e+ Beams

Speaker: G. Moortgat-Pick (IPPP Durham)

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13:50 Photocathode and Gun of highly polarized Electron Source for GLC

Speaker: Hitoshi Yamamoto (Tohoku Univ.)

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14:10 Polarized Positron Source

Speaker: Tsunehiko Omori (KEK)

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14:30 Status Report of the E166 Experiment: A polarized Positron Source for future Linear e+e- Colliders

Speaker: Thomas Schweizer (Humboldt Univ., Berlin)

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14:50 Discussion

13:30 → 15:00 Tracking and vertexing: Silicon R&D I

Conveners:M.Winter, HB. Park, D.Karlen, B.Schumm

13:30 Status of CCD-based vertex detector R&D for a linear collider

Studies of CCD-based vertex detector for a linear collider are presented. In 2003 physical year, our work was focused on the aspects of radiation tolerance for the high energy electrons and charge diffusion time for faster readout operation. This talk gives an overviwe of our current results and future plans.

Speaker: Aso, T. (Toyama National College)

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13:45 LCFI Collaboration Status Report

The LCFI collaboration is conducting a comprehensive research and development programme towards a silicon pixel-based vertex detector for the future LC. The latest results in the development and prototyping of column parallel CCDs, their associated readout electronics and ultra-low mass ladders will be discussed, along with future plans.

Speaker: Joel Goldstein

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14:00 Status Report on the MAPS Detectors for the Warm and the Superconductor Options of the FLC

Very high granularity, very modest material budget, fast read-out and radiation hard sensors are required for construction of the Vertex Detector, providing the measurement precision asked by the physics programme at the Future e+e- Linear Collider (FLC). Various versions of MAPS detectors, searching for optimum operation under given experimental conditions, are being developed within the IReS-LEPSI collaboration in Strasbourg. The detectors are produced in the form of VLSI chips using standard CMOS processes. The active volume is a thin, moderately doped silicon layer, operated undepleted. The key is the use of an n-well-to-substrate diode to collect, mostly through thermal diffusion, the charge (electrons) generated in the active volume underneath the readout electronics.

Speaker: Grzegorz Deptuch

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14:20 Status and first results of the UK active pixel collaboration

We are developing CMOS monolithic active pixel sensors for the vertex detector for the future Linear Collider. We have produced two working test structures designed in 0.25 CMOS which feature four different types of pixels: standard 3MOS, 4MOS allowing correlated double sampling, charge amplifier pixels and a Flexible APS. The FAPS has a 10 deep pipeline on each pixel specifically designed for the linear collider. A program to test our devices is well underway. We will report results of a radiation test including measurements and simulations. Also results of a source test will be presented.

Speaker: Jaap Velthuis

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14:35 Design and Technology of DEPFET Active Pixel Sensors for Future e+e- Linear Collider Experiments

A new generation of DEPFET (DEPleted Field Effect Transistor) active pixel sensors with 25 micrometer pixel size has been developed and produced to meet the requirements of the future e+e- linear collider physics program in point measurement resolution and multiple track separation. A silicon technology is presented which allows the production of large sensor arrays consisting of linear DEPFET pixel cells. The DEPFET concept combines detection and amplification in one single device. The signal charge is stored underneath a MOSFET channel and allows a row-wise read out with only one row being electrically active at a time. The envisaged pixel array offers therefore low noise and low power operation. We will present the operation principles and the results of the first prototype production.

Speaker: Gerhard Lutz

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13:30 → 15:20 e- e- physics

Conveners: C. Heusch, J. Gunion

13:30 e-e-: Introduction and brief overview

Speaker: Heusch, C (U.C. Santa Cruz and SLAC)

13:45 Luminosity expectations

Speaker: Raubenheimer, T. (SLAC)

14:10 IR and beam delivery, e+/e- compatibility

Speaker: Markiewicz, T. (SLAC)

14:25 e-e- at TESLA -- where do we stand?

Speaker: TESLA representative

14:40 Loop-level flavor and number violation in e-e- collisions

We present a study of the loop-level lepton number violating signal e-e- ---> l- l- (l = \mu, \tau) in models with heavy Majorana neutrinos and of the reactions e- e- ---> l- e- (l = \mu, \tau) in the supersymmetric extension of the standard model with slepton mixing.

Speaker: Cannoni, M. (LPNHE)

14:55 Physics motivations for e-e- collisions

Some of the physics motivations for e-e- collisions are reviewed.

Speaker: Gunion, J (U.C. Davis)

15:00 → 16:30 Data Acquisition

Conveners: Usha Mallik, Takeshi Matsuda, Patrick Le Du, Guenter Eckerlin

15:00 LC DAQ Introduction and Overview

Speaker: Eckerlin, G. (DESY)

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15:15 Vertex Detector Readout at the Linear Collider

Speaker: Joel Goldstein

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15:30 LC TPC electronics

Speaker: Colas, P. (Saclay)

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15:45 Readout card for TPC prototypes

Speaker: Martin, J-P. (Univ. of Montreal)

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15:55 DAQ for ECAL and tile HCAL

Speaker: Dauncey, P. (Imp. College London)

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15:00 → 16:30 Machine-detector Interface

Conveners: T. Tauchi, M. Woods, P. Bambade

15:00 Physics impact of beam-beam hadron background

Includes results from Barklow, Murayama and Abe

Speaker: Desch, K. (DESY)

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15:20 Summary of Prague workshop on instrumentation in the very forward region

Coordinating with J. Hauptman's talk in the same session.

Speaker: Lohmann, W. (DESY)

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15:35 Detection of very forward Bhabha events and electron ID algorithm

Continuing the previous talk and including results by Murayama and Graf on the electron ID algorithm

Speaker: Lohmann, W. (for Drugakov, V.) (DESY)

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15:40 Detector technologies for forward calorimeters (quartz fiber-tungsten, Si-W, gas cherenkov-W, PbW04)

Coordinating with W. Lohmann's talk in the same session

Speaker: John Hauptman (Iowa State University)

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16:00 Beamstrahlung monitor

Includes a few slides contributed by Bonvicini on his proposal

Speaker: Delerue, N. (KEK)

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16:15 Pair (beam profile) monitor

Includes analysis using pair profiles from the planned 7 mrad GLC crossing-angle (possibly also 20 mrad)

Speaker: Yamamoto, H. (Tohoku University)

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15:00 → 16:30 Simulation

Conveners: M. Peskin, D. Ward, K. Fujii

15:00 Geant4 simulation for the FLC detector models with Mokka

Speaker: Gabriel Musat (Ecole Polytechnique)

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15:15 Mokka, main guidelines and future

Speaker: Paulo Mora de Freitas (L.L.R. Ecole Polytechnique/IN2P3)

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15:30 Adding electronics effects to the CALICE simulation

Speaker: Catherine Fry (Imperial College)

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15:40 Comparisons of hadronic shower packages

Speaker: Georgios Mavromanolakis (Cambridge)

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15:55 Simulation of CALICE using Fluka

Speaker: Nigel Watson (Rutherford)

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16:10 Hadronization with the event generator SHERPA

Speaker: Stefan Schumann (Dresden)

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16:25 New reconstruction technique developed for HCAL prototype

Speaker: Behnke, T (for Morgunov, V (ITEP Moscow)) (DESY)

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15:00 → 16:30 Susy studies

Conveners: J.Feng, U.Nauenberg, R.Godbole, U.Martyn

15:00 Programme SUSY@LCWS 04

Speaker: A Convener

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15:05 The SPA project and conventions - a proposal for a Supersymmetry Parameter Analysis

Speaker: W. Majerotto (HEPHY Vienna)

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15:25 Experimental tools for SPA

Speaker: P. Wienemann (DESY)

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15:45 Complete one-loop calculations in the chargino/neutralino sector of the MSSM and SPA conventions

Speaker: T. Fritzsche (MPI Munich)

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16:05 Sleptons: Masses, Mixings, Couplings

Speaker: Ayres Freitas (Fermilab)

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15:00 → 16:30 gamma-gamma, e-gamma (joint w/ Higgs)

Conveners: T. Takahashi, J. Gronberg, M. Krawcyk

15:00 Tau polarisation in $\gamma \gamma \rightarrow \phi \rightarrow \tau \bar \tau$ as a probe of CP violation in the Higgs sector.

Speaker: Godbole, R.

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15:15 Determination of CP violating H-A mixing from h_2-> WW/ZZ decays in 2HDM: PLC and comparison with LHC and LC

Speaker: Zarnecki, A.F.

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15:30 Explicit CP Violation in the Higgs Sector at GammaGamma Colliders and other Future Colliders

Speaker: Velasco, M.

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15:45 Studying Higgs bosons by top pair production at photon colliders

Speaker: Asakawa, E.

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16:00 MSSM Higgs sector CP violation at photon colliders

Speaker: Chung, B.

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16:15 Symmetries in 2HDM, CP violation and heavy Higgs effects at PLC

Speaker: Ginzburg, I.

16:30 → 17:00

16:30 collation

17:00 → 18:30 Late afternoon Plenary

17:00 Report from ITRP

Speaker: Barry Barish

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17:30 Colloqium: The need for Precision Measurements

Speaker: Ed Witten

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Wednesday 21 April

09:30 → 11:00 Calorimetry and muons

Conveners: J-C. Brient, D.Chakraborty , K.Kawagoe , M.Piccolo

09:30 Analog tile HCAL prototype

Speaker: M. Danilov (ITEP)

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09:50 Results from minical tile HCAL

Speaker: E. Garutti (DESY)

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10:10 APD studies for tile HCAL

Speaker: J. Cvach (IOP-Prague)

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10:20 Photosensors for scintillator strips

Speaker: T. Takeshita (Shinshu Univ.)

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10:45 Dual readout calorimeter

Speaker: John Hauptman (Iowa State University)

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09:30 → 11:00 Loop Calculations

Conveners: J.Fujimoto, U.Baur, S.Dittmaier

09:30 Contributions to 2-loop QED Bhabha Scattering

Speaker: Gluza, J. (DESY Zeuthen)

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09:50 Comparison of Exact Results for the Virtual Correction to Bremsstrahlung in e+ e- Annihilation at High Energies

Speaker: Yost, S. (Baylor)

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10:10 Radiative Corrections to Neutrino Nucleon Scattering in the MSSM

Speaker: Brein, O. (Aachen)

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10:35 Two-loop SUSY corrections to the Anomalous Magnetic Momentof the Muon

Speaker: Stockinger, D. (IPPP Durham)

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09:30 → 11:00 Machine-Detector Interface

Conveners: T. Tauchi, M. Woods, P. Bambade

09:30 Energy Spectrometers

Includes 1-2 slides contributed by Schreiber on DESY design updates

Speaker: Hildreth, M. (Notre Dame University)

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09:50 Energy spread effects; energy precision

Speaker: Timothy Barklow (SLAC)

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10:10 Energy spectrum measurement at the extraction line

Includes some comments on the GLC extraction line design

Speaker: Kubo, K. (KEK)

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10:25 Luminosity spectrum extraction from Bhabha events

Includes a few slides on similar work by Kurihara

Speaker: Boogert, S. (UCL)

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10:40 Reserve time used for discussion on how we want to organize future MDI work and collaboration

We would like to list the relevant topics where work and collaboration could be enhanced by organizing informal inter-regional working groups. The discussion needs some preparation. Among the topics are for instance issues to do with having 2 IRs with comparable luminosity and energy, one of which with a crossing-angle large enough to make possible the option of a future gg-collider upgrade

Speaker: Convenors and All

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09:30 → 12:30 Susy studies

Conveners: J.Feng, U.Nauenberg, R.Godbole, U.Martyn

09:30 SUSY dark matter and Linear Collider experiments

Speaker: M. Peskin (SLAC)

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09:55 Neutralino dark matter and the Linear Collider

Speaker: H. Baer (Florida SU)

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10:15 Studies of CDM-inspired cMSSM scenarios at a 1 TeV LC

Speaker: M. Battaglia (LBL)

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10:35 Experimental implication for a Linear Collider of the SUSY dark matter scenario

Speaker: Z. Zhang (Orsay)

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10:55 Uncertainties in the relic density calculations in mSUGRA

Speaker: G. Belanger (LAPP Annecy)

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11:15 break

11:30 SDECAY - a code for the decays of the supersymmetric particles in the MSSM

Speaker: M. Muehlleitner (PSI)

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11:45 Impact of combined analyses at the LHC and LC in Susy searches

Speaker: G. Moortgat-Pick (IPPP Durham)

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12:00 Reconstructing supersymmetric theories by coherent LHC/LC analyses

Speaker: W. Porod (Uni Zurich)

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09:30 → 11:00 Tracking and Vertexing: Silicon R&D II

Conveners:M.Winter, HB. Park, D.Karlen, B.Schumm

09:30 Status of the SOI monolithic active pixel detector development

The monolithic active pixel detector realized in the Silicon on Insulator technology (SOI) is a novel solution of ionising radiation detectors, which allows integration of the particle detector and readout electronics in one entity by the utilization of the both silicon layers (support and device layers) of a wafer-bonded SOI substrate. First test structures of the SOI detectors have been manufactured and preliminary characterized. The performed sensor tests with an infrared laser spot and radioactive sources proved the sensor sensitivity for the ionising radiation and validate the concept of the device. Following the positive results of the SOI detector test structures measurements the fully functional SOI detector, covering area of 2 cm x 2 cm have been designed. The resent results of the SOI detector measurements and the architecture the new SOI sensor will be presented.

Speaker: Halina Niemiec

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09:45 The Integrated Pixel Tracker

We propose the Integrated Pixel Tracker (IPT), a device that is part of the vertex detector based on the MIMOSA CMOS pixel sensor. The IPT takes raw data from the pixel sensors, and applies real-time data reduction in two steps by means of hardware: cluster collection on a local level and track reconstruction on a global level. Only the track features are stored on disk. We also discuss our progress on the demonstrator of the IPT, which is a sample system that presents the functionality of the IPT but not the performance, and we give an outlook.

Speaker: Miran Djordjevic

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09:55 Processing of Ultra Thin Silicon Sensors for Future e+e- Linear Collider Experiments

A new generation of DEPFET active pixel sensors with 25 um pixel size is currently being developed to meet the requirements in the point measurement resolution and multiple track separation. To minimize the influence of the multiple scattering on the impact parameter resolution, the sensors have to be made as thin as possible. We will present a technology based on direct wafer bonding and deep anisotropic etching for the production of ultra thin fully depleted sensors with electrically active back side. PiN diodes with 50 um thickness have been produced in this way and the results show the feasibility of this approach. A module concept for thin DEPFET arrays with an integrated support frame outside of the sensitive area will be presented.

Speaker: Ladislav Andricek

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10:10 Report of silicon R&D activities in Korea

We will report on the silicon R&D activities in Korea for the future Linear Collider. The activities includes design, production and simulation of double-side silicon strip sensors. The charateristics of our first prototype sensors and the results of simulation will be presented.

Speaker: Jik Lee

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10:25 Irradiation tests of GaAs:Cr detectors in Protvino and prospects for LC tracking

Expected properties of a resistive structure of gallium arsenide doped by Chromium, GaAs:Cr, are discussed. Pad GaAs:Cr detectors of the size 10mm*10mm are presented as an output of new technologies developed in Tomsk. Results of the recent tests of radiation hardness of these detectors in hadron and gamma beams are reported. Further plans for direct comparison of GaAs:Cr detectors and Si detectors are shown and prospects are discussed for using GaAs:Cr as a material for pixel vertex and tracking detectors at small angles.

Speaker: Yuri Arestov

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10:35 R&D Towards a Short-Shaping Time Silicon Tracker at Santa Cruz

We present the progress of the hardware program on short-shaping time microstrip readout at UC Santa Cruz.

Speaker: Bruce Schumm

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10:50 Latest Progresses on the R&D on Silicon Tracking for the LC

Latest results, within the SiLC R&D program, on the measurements achieved with a long ladder prototype with microstrips of length up to 2m24, on the design and simulation studies of a complete FE and readout electronics chain, on the CAD mechanical design of such a tracking system and related integration issues, on the thermo-mechanical studies are presented as well as the near future prospects.

Speaker: Aurore Savoy-Navarro

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11:00 → 12:30 Data Acquisition

Conveners: Usha Mallik, Takeshi Matsuda, Patrick Le Du, Guenter Eckerlin

11:00 Performance and Occupancies in a CCD Vertex Detector with Endcaps

Speaker: Abe, T. (SLAC)

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11:15 Occupancy in the SiD Tracker

Speaker: Jaros, J. (SLAC)

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11:30 DAQ from present to future (from CDF/D0 to BTev and LHC)

Speaker: Le Du, P. (Saclay)

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12:10 Discussion

Accelerator and detector DAQ interplay - Do we need joint MDI/DAQ sessions ? Detector R&D and DAQ interplay - Do we need joint tracking/Calorimetry/DAQ sessions? GND issues for the DAQ ?

Speaker: All

11:00 → 12:30 New Physics at TeV scale and precision electroweak

Conveners:G. Wilson, J. Hewett, K. Moenig, K. Ruckl, K. Hikasa, S. Raychaudhuri

11:00 Phenomenology of Higgsless Models

Speaker: Tom Rizzo (SLAC)

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11:20 How to do Electroweak Physics without a Higgs

Speaker: Christophe Grojean (CEA-Saclay)

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11:40 Little Higgs phenomonology

Speaker: Wolfgang Kilian (DESY)

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12:00 Search for extra gauge bosons in little Higgs models at a linear collider

Speaker: Gi-Chol Cho (Ochanomizu University)

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11:00 → 12:30 Top and QCD

Conveners:P. Burrows, A. Brandenburg, L. Orr, S. Rindani

11:00 Signature of Perturbative Pomeron in Exclusive Production in gamma* gamma* Processes

Speaker: Wallon, S. (LPT Orsay)

11:25 t tbar higgs Yukawa Coupling Measurement

The (e+e- -> t tbar H) process has been extensively studied to determine the accuracy on the top-Higgs Yukawa coupling achievable with the TESLA collider at 800 GeV, for Higgs masses ranging from 120 GeV/c2 to 200 GeV/c2. The analysis of (H -> b bbar) and (H -> WW) channels has already shown that an accuracy on the top-Higgs Yukawa coupling better than about 10 % was achievable for most of the Higgs masses below 200 GeV/c2. Present work is going on in order to improve the precision on the coupling by including the Higgs decays into Z pairs. The analysis is also being extended to higgs bosons heavier than 200 GeV/c2. First results of these extensions of the analysis will be presented.

Speaker: Auguste Besson (IReS - Strasbourg)

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11:50 Heavy Quarks at Threshold: Recent Developments

Recent developments in the treatment of a system of heavy quarks close to their production threshold are discussed. Particular emphasis is put on the next-to-next-to-next-to-leading order corrections to the energy levels and the wave function and their effect on the cross section sigma(e+e- -> t tbar). Furthermore, the resummation of logarithmic corrections within the framework of potential NRQCD are considered.

Speaker: Steinhauser, M. (Hamburg)

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11:00 → 12:30 gamma-gamma, e-gamma (joint w/ Higgs)

Conveners: T. Takahashi, J. Gronberg, M. Krawcyk

11:00 NMSSM Scenarios with Higgs to Higgs decays in which e+e- and gam gam colliders will be essential for understanding the Higgs sector.

Speaker: Gunion, J.

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11:15 Improved analysis on gamma gamma -> H -> bb including overlaid events, vertex smearing and crab crossing for SM and MSSM

Speaker: Niezurawski, P.

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11:30 Determining tan(beta) in tau tau Fusion of SUSY Higgs Bosons at a Photon Collider

Speaker: Zerwas, P.M.

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11:45 Determination of h couplings from WW/ZZ decays in CP-conserving 2HDM: PLC and comparison with LC and LHC

Speaker: Zarnecki, A.F.

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12:00 Radion physics at a gamma-gamma collider

Speaker: Gunion, J.

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12:15 The Little Higgs boson at a photon collider

Speaker: Gunion, J. ( for Heather Logan)

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12:30 → 12:45

12:30 LUNCH

14:00 → 15:30 Accelerator Physics topics

Conveners:R. Patterson, G.Blair, T. Nakanishi

14:00 Fourier series damping ring kicker for TESLA

The large size of TESLA's damping rings is dictated by the performance of the kicker, which must eject every nth bunch while leaving adjacent bunches undisturbed. The speed with which the kicker fields can stabilize, then turn off, determines the minimum space between damping ring bunches, and therefore the minimum cirumference of the damping ring. Novel schemes which might permit a considerable reduction in damping ring circumference will be described.

Speaker: Gollin, G. (Univ. of Illinois)

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14:15 Laserwire system at PETRA

Speaker: Boogert, S. (UCL)

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14:30 Beam-based Intra Train Feedback Systems

I will present the results of the FONT and FEATHER experiments on hardware prototyping and beam tests of the intra-train feedback system components.

Speaker: Burrows, P. (Queen Mary, Univ of London)

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14:45 DR to IP Simulations and feedback

Speaker: White, G. (Queen Mary, Univ of London)

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15:00 Permanent Final Focus Magnet

A super strong magnet, which utilizes permanent magnet material and saturated iron, is considered as a candidate for the final focus quadrupole in a linear collider beamline. This modified Halbach magnet configuration can have a higher magnetic field gradient than a normal permanent magnet quadrupole (PMQ) or electromagnet. There are some issues to be solved if a PMQ is to be used as a final focus quadrupole: the variation of its strength with temperature and the need for the field strength to be deliberately changed. One can use special temperature compensation material to improve the temperature dependence with just a small decrease in field gradient compared to a magnet without temperature compensation. The required field variability can be obtained by slicing the magnet into pieces along the beamline direction and rotating these slices. The realization of the temperature compensation technique in a prototype magnet and a design with rotating slices will be discussed.

Speaker: Dr Yoshihisa Iwashita (Kyoto University)

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15:15 Final Focus at the IR (FFIR)

Speaker: Tauchi, T. (KEK)

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14:00 → 17:00 Calorimetry and muons

Conveners: K.Kawagoe, D.Chakraborty, J.C.Brient , M.Piccolo

14:00 RPC DHCAL R&D at Protvino

Speaker: V. Ammosov (IHEP-Protvino)

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14:20 RPC R&D for DHCAL at ANL

Speaker: D. Underwood (ANL)

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14:40 GEM's HCAL R&D

Speaker: A. White (Univ. Texas Arlington)

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15:00 scintillator HCAL tail catcher

Speaker: V. Zutshi (North Illinois Univ.)

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15:25 small break 10mn

15:35 R&D for small tile ECAL

Speaker: H. Miyata (Niigata Univ.)

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15:55 R&D of strip-array ECAL

Speaker: K.Kawagoe

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16:15 LCcal: a hybrid technique for ECAL.Test beam results and perspectives

Speaker: P. Checchia (INFN- Padova)

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16:35 Status report on PFA development

Speaker: Dhiman Chakraborty (Northern Illinios)

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14:00 → 17:00 New Physics at TeV scale and precision electroweak

Conveners:G. Wilson, J. Hewett, K. Moenig, K. Ruckl, K. Hikasa, S. Raychaudhuri

14:00 Triple gauge couplings in gamma gamma and egamma interactions

Speaker: Jadranka Sekaric (DESY Zeuthen)

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14:20 SUSY one-loop contribution to W pair production

Speaker: Shinya Kanemura (Osaka University)

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14:40 3 Gauge boson production

Speaker: Michael Beyer (Rostock)

15:00 Role of transverse beam polarization in constraining new physics

Speaker: Saurabh Rindani (Ahmedabad)

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15:20 New Phyiscs with e+ polarization

Speaker: G. Moortgat-Pick (IPPP Durham)

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14:00 → 15:30 SUSY studies

Conveners: J.Feng, U.Nauenberg, R.Godbole, U.Martyn

14:00 Study of neutralino production using tau identification

Speaker: B. Sobloher (DESY)

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14:15 CP Violation in SUSY

Speaker: S. Hesselbach (Uni Wien)

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14:40 Probing the Majorana nature and CP properties of neutralinos

Speaker: S. Y. Choi (Chonbuk Univ)

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14:55 Slepton-flavour violation

Speaker: Reinhold Rueckl (Wurzburg)

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15:15 Correlating LSP decay properties with neutrino mixing angles

Speaker: W. Porod (Uni Zurich)

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14:00 → 17:00 Tracking and Vertexing: Gas detector R&D

Conveners:M.Winter, HB. Park, D.Karlen, B.Schumm


We will have a short break around 15:30.

14:00 GEM-TPC performance in a magnetic field

A prototype TPC with GEM readout was operated in axial magnetic fields for the first time at TRIUMF and DESY in the summer of 2003. Results from an updated analysis of cosmic ray tracks recorded with this device will be shown. Plans for further tests with the prototype TPC will be presented.

Speaker: Dean Karlen

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14:20 High magnetic field performance of a GEM-TPC

One possible option for the main tracking device of a detector at a future Linear Collider is a large Time Projection Chamber (TPC). To replace the traditional wire based gas amplification system of a TPC, so called Micro Pattern Gas Detectors (MPGDs) are considered a good choice. One example of such a MPGD is the Gas Electron Multiplier (GEM). At DESY a prototype TPC equipped with GEMs has been built and tested in cosmic muon runs in a superconducting 5 T magnet. The tracking performance of a GEM TPC in high magnetic fields will be reported and compared to results without B field.

Speaker: P. Wienemann (DESY)

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14:35 The Karlsruhe TPC Protype: Results of beam tests at CERN and of a magnetic field test at DESY

In order to study whether a TPC in combination with a Micro Pattern Gas Amplification stage can meet the demands of future Linear Collider central tracking systems, a small cylindrical TPC Prototype was built in Karlsruhe and equipped with two GEMs and highly-integrated front-end electronics. The studies imply two beam tests at the Proton-Synchrotron (PS) at CERN as well as a test in a superconducting magnet with a magnetic field of up to 5T at DESY. Here the results concerning efficiency, diffusion and spatial resolution will be presented. In the hadronic beam single-row efficiencies of 99.3% for all different gas mixtures could be reached. The spatial resolution shows good agreement in all tests and reaches values of down to 60 microns.

Speaker: Jochen Kaminski

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14:50 TPC R&D Activities using the MPI-Munich Protoype

The LC TPC prototype built and commissioned at MPI-Munich is equipped with wire gas amplification now and is foreseen to also be modified for the Gem and Micromegas (MPGD) technologies. The chamber was transferred to Desy for testing with cosmics and lasers in the 5T magnet and with the readout electronics there. It will then be shipped to KEK for continuation of this series of measurements with final testing in a beam in June. MPGD planes are in preparation for this chamber. Status and results from these activities will be presented at the LCWS2004 tracking session; collaborating institutes include Desy, IPN Orsay, KEK + members of the CDC group, and MPI-Munich.

Speaker: Ron Settles

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15:05 First Magnetic Field Tests of a Large-Area Micromegas TPC

We present first results on magnetic field tests of a Micromegas TPC using cosmic rays. The large-area TPC prototype (1024 channels, 50 cm drift and 50 cm diameter) has been in operation since July 2003 at Saclay. Results from data taken in November 2003 for both Ar-Isobutane and Ar-CF4 mixtures at various magnetic field settings will be shown.

Speaker: Vincent Lepeltier

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15:25 10 minute break

15:35 Readout of a TPC by means of the MediPix CMOS pixel sensor

An 'ideal' readout scheme of a TPC would consist of gas multiplication by either one or more GEM or Micromegas foils, followed by a charge collection device with a granularity corresponding to the primary ionisation cluster spread (and assuming sufficiently low diffusion). A readout channel with granularity similar to the 'grid' size in GEM and Micromegas foils has been realised, as a first step, based on the existing MediPix2 chip. Hit-pixel data show the expected patterns from the conversion of Fe55 quanta in gas mixtures like Argon-Methane (95/5) and Argon-Isobutane (95/5). Measurements of detection of single electrons from minimum ionising particles are at present under way.

Speaker: Jan Timmermans

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15:50 First Tracking Experience for the MPGD TPC readout with Charge Dispersion

If a TPC will be used as central detector at a high energy linear collider the spatial resolution must be improved. Charge amplification with micro pattern gas detectors (MPGD), such as GEMs and Micromegas, will eliminate large systematic effects inherent in the conventional proportional wire cathode pad readout TPC. However, the transverse confinement of the spatial charge in a magnetic field will make it harder for the MPGD readout to achieve good spatial resolution unless the readout pad width is reduced. We have previously demonstrated that a resistive anode can be used to disperse the MPGD charge after amplification to achieve good resolution with wide pads for a point x-ray source. We present here our first results for tracking studies of cosmic-ray particles in a GEM-TPC with a resistive anode.

Speaker: Kirsten Sachs

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16:10 Studies of Charge Broadening in Multi GEM Structures and Developement of a TPC

In the framework of our studies of a GEM readout for a TPC at a Future Linear Collider we present studies on charge broadening effects and the shape of the cluster charge as a function of the magnetic field. Results of measurements with a test chamber in fields up to 5 T will be shown. For further studies a TPC is being built which is designed to fit into the 5T magnet at DESY. Numerical simulations to optimize the design of the field cage have been performed. A status report on the construction of this TPC will be given.

Speaker: Astrid Muennich

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16:25 Optimization of the Ion Feedback in a GEM Setup for a TPC Readout

A critical factor in the design of a TPC for a Linear Collider is the amount of ions drifting back into the sensitive volume. To reduce this ion feedback, multi-GEM-structures are used, which further improve the intrinsic ion feedback suppression of single GEM foils. To optimize the operational parameters of such a structure extensive simulations have been performed. The simulations have been verified by measurements with a small test chamber as well as a large TPC. In addition initial studies on the impact of the ion feedback on the spatial resolution will be presented.

Speaker: Michael Weber

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16:40 Triple-GEM performance in He-based mixtures

The unique advantage of He-based mixtures is that the ion mobilities in He are almost by an order of magnitude higher than that in Ar. Accordingly, using the He-based mixtures could help to solve the problem of ion accumulation in the TPC volume. On the other hand, the unique advantage of GEMs is that they can operate at high gains in pure noble gases, in particular in He and its mixtures with other non-ageing gases, such as N2, Kr, Ne, etc. In this paper, we study the performance of triple-GEM detectors in pure He and its mixtures with N2 and Kr, in the range of 1-10 atm. Ion backdrift, ion feedback and photon feedback effects are observed. Ion mobilities in He and He/N2 are estimated: namely, the drift times of ions between the GEMs are measured analysing ion backdrift- and ion feedback-induced signals.

Speaker: Alexander Vasiljev

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16:50 Central Tracker R&D in Asia

In the past 10 years, we have been developing a mini-jet cell type cylindrical drift chamber as a central tracker for a warm cavity future linear collider. This talk will summarize our activities including developments made since the Jeju meeting.

Speaker: Norik Khalatyan

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15:30 → 17:00 Higgs and EWSB

Conveners: Rick Van Kooten, Howard Haber, Klaus Desch, Satoru Yamashita

15:30 High precision predictions for the MSSM Higgs sector

Speaker: Sven Heinemeyer (CERN)

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16:00 Simulation of heavy SUSY Higgs Bosons

Speaker: Alexei Raspereza (DESY)

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16:20 M_A determination from h branching ratios with full parametric uncertainties

Speaker: Lidija Zivkovic (Weizmann Institute of Science)

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16:40 Pair production of charged and neutral Higgs bosons at CLIC

Speaker: Arnaud Ferrari (Uppsala University)

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15:30 → 09:45 Polarization

Conveners: Gudrid Moortgat-Pick, Tsunehiko Omori, Mike Woods

15:40 TESLA Polarimeter

Speaker: Peter Schueler (DESY, Hamburg)

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16:00 Polarization Studies: Comparison of e+e- and e-e- for NLC and TESLA

Speaker: Mike Woods (SLAC)

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16:25 Physics Measurements for Polarimetry

Speaker: Klaus Moenig (DESY, Zeuthen)

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16:45 Discussion

15:30 → 17:05 new Physics at TeV scale and precision electroweak (joint with Loopverein)

Conveners:G. Wilson, J. Hewett, K. Moenig, K. Ruckl, K. Hikasa,S. Raychaudhuri

15:30 Experimental results on the muon g-2

Speaker: Klaus Jungmann (KVI Groningen)

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15:50 Next-to-next-to-leading order corrections to the effective weak mixing angle

Speaker: Malgorzata Awramik (DESY Zeuthen; Cracow)

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16:10 Automatized calculation of 2f production with aITALC

Speaker: Tord Riemann (DESY Zeuthen)

16:30 The Running of the Electromagnetic Coupling Alpha in Small Angle Bhabha Scattering

Speaker: Luca Trentadue (CERN)

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16:50 Experimental Aspects of Precision Luminosity measurement

Speaker: Leszek Suszycki (University of Science & Tech, Cracow)

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17:10 → 18:10 Plenary colloqium

17:10 Why does Cosmology needs results from a Linear Collider

Speaker: Mark Trodden

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Thursday 22 April

08:30 → 10:00 Higgs and EWSB

Conveners: Rick Van Kooten, Howard Haber, Klaus Desch, Satoru Yamashita

08:30 Search for the MSSM Higgs bosons in the intense coupling regime at TESLA

Speaker: Eduard Boos (SINP MSU)

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08:50 Higgs decays into charginos and neutralinos including full one-loop corrections

Speaker: Helmut Eberl (HEPHY Vienna)

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09:15 NMSSM Higgs and Gaugino analysis

Speaker: David J. Miller (University of Edinburgh)

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09:35 Distinguishing non-minimal Higgs sectors via precise measurements of a light neutral Higgs boson.

Speaker: Andrew Akeroyd (KEK)

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08:30 → 10:00 Simulation (joint session with Loopverein)

Conveners: M. Peskin, D. Ward, K. Fujii

08:30 Six-fermion (and more!) studies

Speaker: Stefan Dittmaier (p.p. Stefano Moretti)

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08:45 e+e- -> 6, 8 fermions with WHIZARD

Speaker: Wolfgang Kilian (DESY)

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09:00 Radiative Corrections to Higgs processes at LC with GRACE

Speaker: Yoshiaki Yasui (Tokyo Management College)

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09:15 Automization of loop calculations

Speaker: Thomas Hahn (MPI Munich)

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09:30 SUSY simulations for the LC with ISAJET

Speaker: H. Baer (Florida SU)

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09:40 Herwig++

Speaker: Stefan Gieseke (Cambridge)

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09:50 Efficient Constrained Markovian algorithm for ISR evolution of PDFs

Speaker: Stanislaw Jadach (Krakow)

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08:30 → 12:00 Test beams

Conveners: J.Yu, Y.Fujii, G.Fisk, V.Vrba

08:30 Introduction

Speaker: Dr vaclav vrba (Institute of Physics, Prague)

08:35 Facilities in Asia

Speaker: Yasuhiro Sugimoto (KEK)

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08:50 Fermilab Meson Test Beam Facility

Speaker: Erik Ramberg (FNAL)

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09:10 SLAC and other North American Facilities

Speaker: Carsten Hast (SLAC)

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09:25 TB Facilities at DESY, Serpukhov and Frascati

Speaker: Volker Korbel (DESY)

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09:40 CERN TB facilities

Speaker: Michael Hauschild (CERN)

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10:00 Coffee Break

10:30 IP&BI R&D

Speaker: Mike Woods (SLAC)

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10:45 Vertex R&D: CMOS Beam Tests

Speaker: Damien Grandjean (IReS - Strasbourg)

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10:55 Tracking R&D

Speaker: Bruce Schumm

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11:15 Calorimeter R&D

Speaker: Felix Sefkow (DESY)

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11:35 Muon R&D

Speaker: M. Piccolo (INFN-LNF)

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11:45 Discussion mediated by Erik Ramberg

Speaker: Erik Ramberg (FNAL)

08:30 → 10:00 Tracking and vertexing: Simulation studies

08:30 CCD output for full LC detector simulation

I am working on the simulation of CCD output (signals from individual pixels), which should be included in the full detector simulation in the JAS. This can give the ideas about limits and optimization of the CCD based vertex detector in the spatial resolution, tracks separation, readout speed and so on. It also allows better understanding of the impact of vertex detector parameters on physics reach of LC detector. Details of the model of CCD operation and it's implementation in the software will be given. I will also present examples of results obtained with this code.

Speaker: Nikolai Sinev

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08:45 Strategies for pickup and noise suppression with different vertex detector technologies

At the US LC workshop held at SLAC in January 2004, it became clear that the SLC experience with beam-related pickup could have important consequences for the vertex detector at the future LC. There are major differences for the warm and cold machine, and for different detector technologies. We review the current thinking in the light of these discussions, and consider pointers to architectures which would be tolerant of the levels of pickup likely to be encountered.

Speaker: Chris Damerell

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09:00 Pattern Recognition Studies for a Silicon Outer Tracker

We have studied pattern recognition in a variant of the proposed SD detector where the outer 5 layers (r=20-125 cm) have axial-only strips. The purpose of these studies is to determine if this detector, combined with a fully 3D (CCD) inner tracker, is sufficient for the reconstruction of tracks in the dense core of jets. Using standard algorithms, track finding efficiencies are presented for various track pT as a function of the distance from the jet center, and failure modes are discussed. The change in response due to detector inefficiencies and event backgrounds (pair BG, other beam BGs, and BGs from overlapping 2-photon reactions) are also investigated, as is the gain from crude tiling in the longitudinal direction.

Speaker: Steve Wagner

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09:15 Design Study for a Detector with Continuous Tracking

The concept of a large volume detector with continuous 3d tracking and granular calorimeters contained in a solenoidal magnetic field offers many desirable features for the linear collider. The design optimisation aims at reviewing its detailed design, assessing its physics performances for benchmark processes and identifing detector requirements to be supported by dedicated R&D activity. The activity ongoing within the American Linear Collider Physics Group is presented with some preliminary results and study perspectives discussed in detail.

Speaker: M. Battaglia (LBL)

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09:30 TPC Detector Response Simulation and Track Reconstruction

Linear collider detector designs considered in the North American study include two technologies for the central tracking system: a TPC and an all-silicon tracker. These designs must be evaluated in terms of track reconstruction efficiency and resolution. Performance in these quantities determines the ability to successfully analyze complex events. In particular, superior tracking performance is required for energy flow analyses. This study concentrates on the track reconstruction efficiency of a TPC central tracking device. Current results in reconstruction efficiency as a function of TPC pad size will be presented.

Speaker: Daniel Peterson

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09:45 CCD Vertex Detector Charm-Tagging Performance in Studies of Heavy Scalar Quarks

The influence of varying the vertex detector design on searches for scalar top quarks at the Linear Collider have been studied. The benchmark reaction depends on the c-quark tagging capabilities of the detector design. The influence of the material thickness of the detector layers, and the number of sensitive layers has been considered.

Speaker: Andre Sopczak

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08:30 → 10:00 calorimetry and muons

Conveners: J-C. Brient , D.Chakraborty, K.Kawagoe, M.Piccolo

08:30 Si/W ECAL for SD

Speaker: R. Frey (Oregon Univ.)

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08:50 VFE for prototype, VFE for final detector

Speaker: J. Fleury (LAL - Orsay)

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09:10 Status of the CALICE ECAL

Speaker: J-Ch. Vanel (LLR - Ecole polytechnique)

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09:30 DAQ for CALICE ECAL and tile HCAL

Speaker: Paul Dauncey (Imp. Coll. London)

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10:00 → 10:30

10:00 Coffee break

10:30 → 12:00 Higgs and EWSB

Conveners: Rick Van Kooten, Howard Haber, Klaus Desch, Satoru Yamashita

10:30 Neutral Higgs Boson Production and CP Violation at LC

Speaker: Kang Young Lee (KAIST)

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10:55 Search for the Lepton Flavor Violation in the Higgs Boson Decay at a Linear Collider

Speaker: Toshihiko Ota (Osaka University)

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11:20 The invisible Higgs decay in the ADD model at LHC and LC

Speaker: Daniele Dominici (Universita di Firenze)

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11:40 Future Directions for the Higgs Working Group--A General Discussion

Speaker: Desch, K. (DESY)

10:30 → 12:05 New Physics at TeV scale and precision electroweak

Conveners:G. Wilson, J. Hewett, K. Moenig, K. Ruckl, K. Hikasa, S. Raychaudhuri

10:30 Kaluza-Klein dark matter

Speaker: Tim Tait (Fermilab)

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10:50 Identifying Universal Extra Dimensions at CLIC

Speaker: Albert DeRoeck (CERN)

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11:10 Probing Minimal 5D Extensions of the SM

Speaker: Reinhold Rueckl (Wurzburg)

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11:30 Graviton-induced Bremsstrahlung at e^+e^- colliders

Speaker: Per Osland (Bergen)

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11:50 Higgs pair production in models with large extra

Speaker: Nobuchika Okada (KEK)

10:30 → 12:00 SUSY studies

Conveners: J.Feng, U.Nauenberg, R.Godbole, U.Martyn

10:30 Reconstructing sleptons in cascade decays at the LC

Speaker: M. Berggren (LPNHE Paris VI & VII)

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10:45 Sfermion production at a Linear Collider

Speaker: K. Kovarik (HEPHY Vienna)

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11:00 Precision Mass determination for stop quarks using charm tagging

Speaker: A. Finch (Lancaster Univ)

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11:15 Stop production in polarized photon-photon collisions

Speaker: N. Skachkov (JINR)

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11:30 NLO-MSSM corrections to squark pair production in photon-photon collisions

Speaker: S. Berge (SMU)

11:45 Collider phenomenology of light strange-bottom squark

Speaker: K. Cheung (Natl Tsing Hua Univ)

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10:30 → 12:00 global detector geometry and design

Conveners: T. Behnke

Please note, that the times allocated are preliminary and will probably change.

10:30 Particle Flow and Detector Geometries

Speaker: brient@poly.in2p3.fr

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10:45 The small detector concept

Speaker: A. White (Univ. Texas Arlington)

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11:00 The large detector concept

Speaker: P. Checchia (INFN- Padova)

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11:15 Differences between the US large and the TESLA large detector

Speaker: Mike Ronan (Berkeley)

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12:00 → 13:30

12:00 LUNCH

13:30 → 17:00 Plenary discussions

13:30 Chair: Sachio Komamiya - Questions and discussion on the accelerator technology option

(following Monday's afternoon talks)

Speaker: Panel:G. Dugan, A. Wagner

14:00 Short presentations on detector related warm/cold issues. Chair : J. Jaros - Energy Luminosity and polarization measurement

Speaker: M. Woods

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14:10 Timing and bunch structure

Speaker: K. Desch

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14:20 Forward Region Issues

Speaker: T. Tauchi/ P. Bambade

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14:30 Discussion

15:00 Chair: J. Brau - Draft response to ILCSC/ICFA request for a global experimental programme.

Speaker: D. Miller

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15:15 Discussion

15:30 collation

16:00 Chair: Rolf-Dieter Heuer - LC Outreach: to the public and to decision makers

Speaker: P. Burrows

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16:25 Draft answers to ITRP questions task force

Speaker: JoAnne Hewett

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16:40 Discussion

17:00 → 18:00 Colloquium

17:00 Energy Flow and Particle Flow

Speaker: Henri Videau

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19:30 → 22:00

19:30 Social dinner at the Palais du Luxembourg (Senat)

The social dinner will take place in the Palais which houses the French Upper House (Senat)

Friday 23 April

08:30 → 12:05 Plenary Session: summary talks

08:30 Higgs and EWSB : Experiments

Speaker: Timothy Barklow (SLAC)

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08:45 Higgs and EWSB : Theory

Speaker: Shinya Kanemura (Osaka University)

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09:00 Susy Studies

Speaker: G. Belanger (LAPP Annecy)

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09:25 New Physics at TeV scale and precision Electroweak

Speaker: Atul Gurtu (Tata Institute)

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09:55 Top and QCD

Speaker: Zenro Hioki (University of Tokushima)

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10:10 coffee break

10:30 Gamma-Gamma e-gamma physics and technology

Speaker: Mayda Velasco (Northwestern University)

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10:45 Loop calculations

Speaker: Sven Heinemeyer (CERN)

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10:55 e- e-

Speaker: K. Cheung (Natl Tsing Hua Univ)

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11:05 Tracking and Vertexing

Speaker: M. Battaglia (LBL)

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11:35 Calorimetry and Muons

Speaker: T. Takeshita (Shinshu Univ.)

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12:05 → 13:35

12:05 LUNCH

13:30 → 16:05 Plenary Session: summary talks

13:30 Simulation

Speaker: Ties Behnke (DESY)

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13:50 Machine-Detector interface

Speaker: Olivier Napoly (CEA/Saclay, DAPNIA/SACM)

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14:05 Test Beams

Speaker: Dr vaclav vrba (Institute of Physics, Prague)

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14:15 accelerator Physics

Speaker: George Gollin (University of Illinois)

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14:30 Polarization

Speaker: Achim Stahl (DESY Zeuthen)

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14:45 Cosmology

Speaker: H. Baer (Florida SU)

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15:00 Collation

15:30 Summary Talk

Speaker: Rolf Heuer (Hamburg University)

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16:00 Conference closing