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Galina Pakhlova ITEP, Moscow, 28/05/2003

LoKi for physics. Galina Pakhlova ITEP, Moscow, 28/05/2003. Physicists are NOT code developers Too many languages & packages to study – life is short Existence of “Black Boxes” (if they are perfect) simplify our life and provide more time for physics analysis itself

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Galina Pakhlova ITEP, Moscow, 28/05/2003

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  1. LoKi for physics Galina Pakhlova ITEP, Moscow, 28/05/2003 • Physicists are NOT code developers • Too many languages & packages to study – life is short • Existence of “Black Boxes” (if they are perfect) simplify our life and provide more time for physics analysis itself • Brilliant example of Physics Analysis Package:KAL in AGRUS • writing of typical physics selection : one page A4 & less than one hour • My experience in C++ : 0 level one year ago • C++ & DaVinci (including Associators) : at least 3 month before first results in analysis (not so bad) Thank you, Gloria! • LoKi from this February: ONE day to study documentation + few HOURS to re-write algorithm + one week to VERY careful comparison of LoKi parameters & functions with corresponding ones from DaVinci. • One month for “ B -> f g” analysis (from the very beginning in parallel with other activities)

  2. Advantages of LoKi, few examples • Few hours to write NEW algorithm from the very beginning • Minimum knowledge of C++ is needed • Really short ONE *.cpp file. No *.h file !!! • Ntuple parameters are defined and filled in ONE (the same) place • Minimum time to correct misprints and errors • Practically ALL necessary physics parameters and functions are predefined • Possibility of mistake if you create such functions yourself is excluded • MC is simple: “one line” and fast • in some cases factor of ~ 20 vs DaVinci Associators • If you LIKE: you can include ANY part of DaVinci codes and functions in your LoKi algorithm

  3. Conclusion Thank you, Vanya ! Physics friends, Don’t worry Try LoKi Be happy !

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