Atlas cms discussion of computers in the search for the higgs boson for jcss
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ATLAS+CMS discussion of “Computers in the search for the Higgs Boson” for JCSS. Ian Fisk (FNAL) + Norman McCubbin (RAL) 26 th November 2013. Where have we got to…???. As last time (October): not as far advanced as we hoped for…  We have:

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ATLAS+CMS discussion of “Computers in the search for the Higgs Boson” for JCSS

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Atlas cms discussion of computers in the search for the higgs boson for jcss

ATLAS+CMS discussion of “Computers in the search for the Higgs Boson”for JCSS

Ian Fisk (FNAL) + Norman McCubbin (RAL)

26th November 2013


Where have we got to

Where have we got to…???

  • As last time (October): not as far advanced as we hoped for… 

  • We have:

    • Outline, attached to indico page: fewer missing names than last time;

    • SVN repository: has been “exercised” a bit. Ian has updated (?) the (rather old) latex version used by SVN.

    • cms-atlas-jcss mailing list. (PLEASE SUBSCRIBE, if you haven’t done so!)

    • There’s now a twiki page (email 23rd November) for other material that may be interesting or useful:

      https://twiki.cern.ch/twiki/bin/viewauth/CMSPublic/JointJCSSPaper

ATLAS+CMS:JCSS 25 Oct 2013


Introduction chapters 1 2

Introduction: Chapters 1 +2

  • There has been some discussion of what’s in Chapters 1+2, and in what order.

  • Very rough text and ideas are in the SVN repository (under ’overview’ – Ch2).

  • Chapter 1 will contain:

    • Introduction to particle physics and “Higgs” at a level suitable for the “numerate (eg computer scientist) lay-person”.

    • The fact that pp collisions have many possible outcomes, and some (eg Higgs production) are very rare. (Rate= sigma x Lumietc) Also the idea that the mass of a short-lived particle can be inferred from measurement of its decay products. (“E=mc2” etc)

    • Sufficient introduction and key parameters of LHC machine and the detectors to motivate:

    • Discussion of the LHC “computing challenge(s)”.

ATLAS+CMS:JCSS 26 Nov 2013


Introduction chapters 1 21

Introduction: Chapters 1 +2

  • Chapter 2 will contain:

    • A brief description of the “flow” from either real LHC collisions or simulation through to “publication” and/or physics results.

    • Hence the following terminology and ideas get introduced in this chapter, but detailed descriptions will come in the later chapters:

      • Collision rate, pile-up, simulation (Monte Carlo), DAQ and trigger, data rates and volumes, on-line, off-line, reconstruction, calibration, alignment, distributed processing and analysis, physics analysis, internal checking of potential results.

ATLAS+CMS:JCSS 25 Oct 2013


Introduction chapters 1 22

Introduction: Chapters 1 +2

  • Flavour of (so not final) figures or pictures that will be in Chapters 1 +2 :

ATLAS+CMS:JCSS 25 Oct 2013


Introduction chapters 1 23

Introduction: Chapters 1 +2

  • NOT FINAL figures or pictures that will be in Chapters 1 +2 :

ATLAS+CMS:JCSS 25 Oct 2013


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