DESY Participation

in an

External Experiment

Joachim Mnich

PRC Meeting

26.05.2005

- External experiment is part of DESY base programme as proposed to HGF to bridge the period between end of HERA and the start of the ILC

- Initial discussions at DESY in 2003 two options were discussed 1. neutrino experiment 2. LHC programme

- (Re-)formation of a Strategy Group Representatives from DESY and German universities

- Meetings in 2005 February 28th (incl. public presentations) March 31st

+ input from outside the strategy group

DESY Participation in an External Experiment

Why LHC?

- Very broad and rich physics programme at the LHC- LHC flagship of high energy physics for one to two decades most crucial results for the evolution of physics - Large physics overlap with HERA and LHC physics- Natural development of DESY expertise in HEP experimentation similar detectors, collaborations, data analysis, computing, ...- Collaboration with German universities (HEP groups)

HERA LHC ILC

Conclusion of Strategy Group

General and broad consensus reached: - DESY should participate in the LHC programme - Recommendation to participate in the large multi-purpose experiments at the LHC: ATLAS, CMS

protons

protons Atlas

The Large Hadron Collider LHC

Physics at the LHC

- High energy: 14 TeV - High luminosity: 1033 1034/cm2/s- First collisions in 2007- Initial physics runs 2008

Large cross sections and event rates: 1 tt-pair per second 1 Higgs boson per minute

at 1033/cm2/s

Two Examples for the LHC Physics Reach

SM Higgs boson discovery Physics beyond the SMReach extends to multi-TeV range

Atlas

SUSY, EDM, new vector bosons, heavy neutrinos,technicolour, compositness, lepto-quarks, ...

ILCLHCHERA

A DESY participation at the LHC:The bridge from HERA to the ILC

Final MeetingMarch 21-24DESY, Hamburg

Both workshops will continue...

- Natural continuation of HERA programme- Ideal preparation for physics at the ILC- Synergy also for DESY theory group

Workshops demonstratephysics overlap

Collaboration with German University Groups

- Bonn- Dortmund- Freiburg- Heidelberg- Mainz- Mannheim- LMU München- MPI München- Siegen- Wuppertal

- Aachen- Hamburg- Karlsruhe

ATLAS

CMS

Most German HEP groups are strongly involved in the LHC experiments:

Twofold DESY engagement:

1. Provide Tier-II analysis centres for ATLAS and CMS

2. Experimental group (physics analysis & detector contribution) in ATLAS or CMS

Very positive reaction - from both experiments - and the German groups

- Resources to be fit into frame given by ongoing HEP programmes HERA and ILC

- Intention is a long-term engagement possibly extending to concurrent participation in LHC and ILC physics

- DESY contributions should be visible

Scope and Plans of the DESY Participation at the LHC

Tier-II Analysis Centres

Computing of the LHC experiments is based on Grid technologyLCG project: LHC Computing Grid

Tier 0: first data processing at CERNTier 1: data re-processing 10 worldwideTier 2: data selection, analysis & MC production 1-3 per country & expt. (Europe)Tier 3: physics analysis & MC production at universities

T0

T1

T1

T1

T1T1

T2

T2

T2

Legnaro

IC London

CIEMAT Madrid

FZK Karlsruhe

RAL Oxford

IN2P3 Lyon

CNAF Bologna

PIC Barcelona

T1

FNAL Chicago

T2 Uni Florida

DESY

• Competence: existing Grid infrastructure at DESY - HERA experiments - ILC studies extensively use LCG

• Prospects: keep & develop at DESY competence in

- treatment of large data volumes- operation of complex computing architectures- participation in world wide computing devolopments

- Ideal preparation for ILC Long-term strategic orientation from HERA to ILC analysis centre

- Matches DESY charge to provide support to the German HEP community

DESY is ideally suited as Tier II for german universities

Tier-II Analysis Centres

Status Tier-II Analysis Centres

- Prototyp infrastructure being set up in collaboration with Uni HH (CMS)

- Discussions with both experiments started

- Participation of DESY in LCG service challenges planned (June/July) - exercise Grid tools on large data samples - moving data between Tiers - distributed analysis

Participation in ATLAS or CMS?

Status and plans:

DESY group nominated to

- collect information from both experiments on possible contributions - evaluate the differences in these possibilities between the two experiments e.g. in terms of prospects of successful impact from DESY

- not supposed to become the LHC group - not supposed to negotiate with the collaboration

Contact to experiments establishedIn discussions with German groups - received very positive reactions - CERN visit next week to discuss with experiments

K. Borras, P. Kostka, A. Meyer, J. Mnich, D. Pitzl, C. Youngman, P. Zerwas

- DESY contributions to physics analysis interesting topics where DESY participation is needed/welcome match with DESY interest & expertise, incl. theory group synergy between Tier-II analysis centre and DESY analysis group

- Possible DESY contributions to baseline detectors for 2007/2008 planned upgrades and replacements and their time lines includes hardware and software contributions

- Collaboration with German unversity groups evaluate overlap in physics interest where could DESY provide valuable support to German groups (besides Tier-II)

Items of discussion

Final decision ATLAS versus CMS will be based on- Input from group- Interest of DESY scientists- General considerations

Detector contributions under discussion

Examples based on first reactions of experiments:

- Data Acquisition & High Level Trigger reconstruction & selection software close to physics detector control synergy with ILC detector

- Detector commissioning important activity of experiments in 2005-2008 special expertise at DESY

- Forward detectors interest at DESY & open issues at the experiments

- Detector upgrades/replacements vertex detectors (pixel) very forward (420 m)- around 2015: very high luminosity 1035/cm2/s (SLHC) new tracker, DAQ upgrades, ...

• Broad consensus for a DESY participation in the LHC

• LHC is physics at the high energy frontier - ideal continuation of HERA and - ideal preparation of the ILC physics programme

• All German HEP institutes participate in LHC experiments- DESY could provide valuable support for universities

e.g. computing

• Tier-II ideal opportunity to position DESY as an ILC analysis centre

• Visible DESY contributions to LHC experiments still possible and very welcome by the experiments - Discussion with the experiment and the German LHC groups started

Summary