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Belle II computing model Belle II computing model (in relation to the EGI infrastructure) (in relation to the EGI infrastructure) Marko Brako (Joef Stefan Institute, Ljubljana & University of Maribor, Maribor) EGI Community Forum, EGI

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Belle II computing model Belle II computing model (in relation to the EGI infrastructure) (in relation to the EGI infrastructure)

Marko Bračko (Jožef Stefan Institute, Ljubljana & University of Maribor, Maribor)

EGI Community Forum, EGI Community Forum, Helsinki, Finland, 22 Helsinki, Finland, 22nd

nd May 2014

May 2014

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Marko Bračko DISCRETE`08, Valencia 2

“… As late as 2001, the two particle detectors BaBar at Stanford, USA and Belle at Tsukuba, Japan, both detected broken symmetries independently of each other. The results were exactly as Kobayashi and Maskawa had predicted almost three decades earlier.”

B- Factories (KEKB&PEP-II): B- Factories (KEKB&PEP-II): A Success Story A Success Story

Quantitative confirmation of the KM model in the SM

  • M. Bracko: Belle II computing model

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Introduction: Introduction: Physics Objectives of Belle/BaBar and Belle II Physics Objectives of Belle/BaBar and Belle II

Asymmetry = (N-N)/(N+N) B0→J/ψK0

_

B0→J/ψK0

_ _

Discovery of CP violation in the B system Measurements of the CKM matrix elements

PDG 2008

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  • M. Bracko: Belle II computing model

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✔ Confirmation of KM

mechanism of CP in the Standard Model

✗ CP in the SM too small

(by many orders of magnitude)

to generate observed matter-antimatter asymmetry in the universe

➔ Need sources

  • f CP beyond

the SM

➔ Super B factory

Complementary to the LHCb experiment at CERN

arXiv:1205.5442

B → D(*)τν

Measurement Type II two-Higgs-doublet model (2HDM)

Introduction: Introduction: Physics Objectives of Belle/BaBar and Belle II Physics Objectives of Belle/BaBar and Belle II

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Marko Bračko DISCRETE`08, Valencia 5

  • What is the next experimental step? Precision measurements
  • Much larger sample needed for this purpose −> Super B factory
  • Hopefully new phenomena might be seen:

– CPV in B decays from the physics outside the KM scheme. – Lepton flavor violations in τ decays.

  • Physics models can be identified (if new effects are observed)
  • r new ones can be constrained (if nothing is seen).
  • Even in the worst case scenario (e.g. for MFV), B −> τν, Dτν can probe the charged

Higgs in the large tanβ region.

  • Physics motivation is independent of LHC.

– If LHC finds NP, precision flavour physics is compulsory. – If LHC finds no NP, high statistics B/τ decays would be a unique way to search for the TeV scale physics.

Introduction: Physics at a Super B Factory Introduction: Physics at a Super B Factory

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Introduction: KEK Site Introduction: KEK Site

Tsukuba Tokyo

  • Mt. Fuji

Narita

e+ e–

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~600 members almost 100 institutions from 23 countries/regions

Introduction: Introduction: Belle II Experiment Belle II Experiment

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~600 members almost 100 institutions from 23 countries/regions

Introduction: Introduction: Belle II Collaboration Belle II Collaboration

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Integrated luminosity Integrated luminosity (ab (ab-1

  • 1)

) Peak luminosity Peak luminosity (cm (cm-2

  • 2s

s-1

  • 1)

)

Year Year

Shutdown for upgrade Commissioning starts early 2015 Physics run starts 2016 Will reach 50 ab-1 in 2022

40x Belle 50x Belle

Projection of Luminosity at SuperKEKB Projection of Luminosity at SuperKEKB

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Resource Estimates Resource Estimates

→ Similar data rate as LHC experiments (and comparable in total requirements)!

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Belle II Computing Model Belle II Computing Model

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Belle II Distributed Computing System Belle II Distributed Computing System

  • Based on existing, well-proven solutions plus extensions

for Belle II

➔ DIRAC for job management ➔ AMGA for metadata ➔ CVMFS for software distribution

(thanks to CERN and Steve Traylen for providing the Stratum-0 server, and to GridKa for the stratum-1 server)

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Workflow Abstraction Workflow Abstraction

FileA FileB FileC ... FileX FileY FileZ ...

Input data files Output data files

Job1 Job2 ...

(analysis) jobs Input dataset Output dataset Project

➢ Usage of different middlewares is treated by Dirac in a

user-transparent way.

➢ Don't deal with single files and jobs,

but with datasets and projects

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  • Job submission

 gbasf2 -r 1000 -s B2Kpi.py -p B2Kpi_s01

  • Job monitoring

 gb2_project_summary  gb2_project_analysis

  • -Project B2Kpi_s01

 gb2_job_status

  • -Project B2Kpi_s01
  • -Status=failed
  • Rescheduling of failed jobs

 gb2_job_reschedule

  • -Project B2Kpi_s01
  • Job output

 gb2_job_output --Project B2Kpi_s01

  • -Status=failed

Projects Projects

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MC Production Campaigns MC Production Campaigns

  • 1st MC Campaign: February 28 – March 19, 2013
  • 1st stage: event generation and detector simulation

→ raw data

  • 2nd stage:

reconstruction

➔ 240k jobs,

40 kHS*days

➔ 60M events,

190 TB of output data

~20% failure rate: metadata registration, input data download, application errors

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MC Production Campaigns MC Production Campaigns

First Campaign Second Campaign Output data upload recovery

  • 2nd MC Campaign: July 23 – September 8, 2013
  • Simulation and reconstruction, with background mixing

→ mdst data

➔ 630k jobs,

700 kHS*days

➔ 560M events,

8.5 TB of output data

~10% → 1% failure rate: site configuration/ downtime, proxy expiration, server load, human errors

No crash of offline software

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MC Production Campaigns: MC Production Campaigns: Contributing Sites (2013) Contributing Sites (2013)

GridKa Nebraska PNNL Nagoya CESNET DESY KISTI CYFRONET CESNET Virginia FNAL UA-ISMA SIGNET KEK

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MC Production Campaigns: MC Production Campaigns: Contributing Sites Contributing Sites

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MC Production Campaigns: MC Production Campaigns: Issues & Solutions Issues & Solutions

  • Failover mechanism for output storage

(Increased number of pool accounts on KEK SE)

  • Proxy lifetime extended to 168 hours
  • Communication frequency with DIRAC decreased

and services distributed over more nodes

DIRAC load

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MC Production Campaigns MC Production Campaigns

  • 3rd MC Campaign: ~ April 1 – May 15, 2014
  • Simulation and reconstruction, with background mixing

→ mdst data

  • 2x previous CPU#:

11k concurrent jobs; > 80 kHS max

  • ~30 sites contributing
  • 4.2G events produced

→ Very successful;

also updated analysis and grid software

→ To obtain useful data

for physics studies new extensive MC production started this week

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Data Challenge

➢ Network connection between sites is essential  Raw data from KEK to PNNL  Mdst data and MC between sites world wide ➔ Transfer tests between different sites in May 2013

with FTS2 server at GridKa

PNNL

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22

Monitoring

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Relation to the EGI infrastructure Relation to the EGI infrastructure

  • Significant share of our resources is part of EGI infrastructure

(current estimates: almost 70 %)

  • Resources are provided by Resource Providers: sites from

(HEP) institutions participating in Belle II, but also from non-membering institutions

  • We have special contacts with GEANT to enable the

necessary connectivity (relation to LHCONE has already been brought up in the discussion)

  • Usage of central infrastructure: GGUS, GStat2, and GOCDB.
  • So far, EGI infrastructure has proven to be essential for the

Belle II computing model.

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EGI: Future (additional) collaboration EGI: Future (additional) collaboration

  • EGI contact network: Our development could benefit from

contacts throught the EGI contact network, meetings.

  • EGI facilities:

→ Future Belle II computing meeting(s) in Amsterdam?

  • EGI support might be crucial in various funding proposals:

→ There is already a VLDATA DIRAC-based project proposal in preparation with other partners (EGI has played an important role in identifying possible partners and hosting application preparation events)

  • EGI support for DIRAC is vital for us:

We are relying on the long-term collaboration with DIRAC through which we should be compatible with future technical development of EGI (e.g. support for middleware deployed by DIRAC).

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