Physics Plans and Machines in Germany Major Collaborations in - - PowerPoint PPT Presentation

Physics Plans and Machines in Germany

Major Collaborations in Germany:

• BMW: Budapest, Marseille, Wuppertal
• CLS: Coordinated Lattice Simulations
• ETMC: European Twisted Mass Collaboration
• QCDSF: QCD Structure Functions
• RBG: RBC-Bielefeld-GSI

Physics

• BMW:

– Thermodynamics (Wuppertal and Budapest) – T=0 Physics (Budapest-Marseille-Wuppertal)

• CLS

– K-, charm- and B-physics; structural properties of light baryons

• QCDSF and ETMC: very similar and broad physics plans, e.g.

– Structure functions, form factors and generalised parton distribution functions

• f baryons and mesons

– Distribution Amplitudes of baryons and mesons – Disconnect contributions – Muon anomalous magnetic moment – Resonances – Hadron mass spectrum, decay constants, quark masses, running coupling and Λ parameter

• RBC-Bielefeld-GSI:

– Non-zero temperature and density – Equation of State

Some results from Germany

0.1 0.2 0.3 0.4 0.5 mπ

2[GeV 2]

0.1 0.15 0.2 0.25 0.3 0.35

Nf=2+1 DWF [RBC/UKQCD] (2.7fm) Nf=0 DWF [RBC] (2.4fm) Nf=2+1 Mix [LHPC] (2.5fm) Nf=2 Clover [QCDSF] (1.9-2.4 fm) Nf=0 Clover [QCDSF] (1.6 fm)

MRST 2002

〈x〉u-d

500 1000 1500 2000 M[MeV]

p K r K* N L S X D S* X* O

experiment width QCD

Simulation Plans BMW Action: Symanzik improved gauge stout improved Nf = 2 + 1 staggered and (clover) Wilson Parameters a 0.065fm, mπ 190MeV QCDSF Action: Nf = 2 NP-Clover Parameters: mπ = 138MeV, a ≈ 0.075fm, V = 64396 Plan: Nf = 2 + 1 SLiNC Parameters: mπ = 230MeV, a = 0.08fm, V = 64396, SU(3) point Configurations: all Nf = 2 ensembles uploaded ETMC Action: Nf = 2 + 1 + 1, maximally tmQCD, Iwasaki gauge Parameters: a = 0.05 − 0.10fm, L ≈ 3.0fm, 150 < mπ < 400MeV Configurations: all Nf = 2 (4 lattice spacings) ensembles uploaded CLS Action: Nf = 2, NP O(a)-improved Parameters: a = 0.04 − 0.08fm, L 4.0fm, mπ 200MeV RBG Action: asqtad and p4 Parameters: Nτ = 6, 8, 12, mπ ≈ 150MeV and mπ ≈ 220MeV

Supercomputer Infrastructure

• apeNEXT in Zeuthen 3Teraflops

and Bielefeld 5Teraflops → dedicated to LGT

• NIC 72 racks of BG/P System

at FZ-J¨ ulich 1 Petaflops

• 2208 Nehalem processor

Cluster computer: 208 Teraflops

• Altix System at LRZ Munic

62 Teraflops

• SGI Altix ICE 8200 at HLRN (Berlin, Hannover)

31 Teraflops

• QPACE 4+4 Racks in J¨

ulich und Wuppertal 1900 PowerXCell 8i nodes 190 TFlops

• University machines, e.g. University of Mainz:

280 nodes Dual Quadcore AMD Barcelona + Infiniband, 15 TFlops

ILDG Enthusiasm Collaboration ILDG BMW

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CLS

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ETMC YES QCDSF YES RBG

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