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RE: Particle physics @ Utopian - Implementing an LHC analysis on a computer: the physics objects

in #utopian-io • 6 years ago

Sorry, just to be clear:

Go directly to the third paragraph of page 14 and implement the overlap removal procedure between baseline jets, muons and electrons. Ignore the b-tags, ghosts and shared track stuff. In short, the first and fourth removals shown in Table 3 on page 15 must be implemented.

You mean implementing the (e,μ) and (j,l) checks only, right?

You mentioned that we should ignored "shared track" but that is the matching criteria of the (e,μ) check.

Also, I'm not sure what a "calo-tagged" muon is. Is this attribute stored in the C++ muon instance?

Finally what does the "/GeV" mean in Plt/GeV?
Does this mean the transversal momentum of the lepton expressed in GeV?

Thanks for your help.

6 years ago in #utopian-io by
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     6 years ago 

    You mean implementing the (e,μ) and (j,l) checks only, right?

    Argh! A typo in my post. I meant second column. Sorry about that. One needs to implement the e/j and j/l removals.

    Finally what does the "/GeV" mean in Plt/GeV?
    Does this mean the transversal momentum of the lepton expressed in GeV?

    In particle physics, we use a very handy system of units in which the speed of light equals 1 and the Planck constant equals 1. This implies that everything can be expressed in GeV (energy, momentum, mass, etc...) or 1/GeV (length, time, etc...) or actually some powers of GeV.

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     6 years ago 

    Argh! A typo in my post. I meant second column. Sorry about that. One needs to implement the e/j and j/l removals.

    Ah cool, that makes sense now.

    In particle physics, we use a very handy system of units in which the speed of light equals 1 and the Planck constant equals 1. This implies that everything can be expressed in GeV (energy, momentum, mass, etc...) or 1/GeV (length, time, etc...) or actually some powers of GeV.

    OK, but I'm still unsure how this affects the calculation in column 4.
    I understand the Plt part but I'm not sure if the /GeV has any bearing.
    Units are usually not explicitly indicated in formulas, right?
    Or am I wrong and there is some kind of division to apply to Plt?

    Thanks!

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       6 years ago 

      This is actually a way to write the equation consistently from the dimension standpoint. The transverse momentum pT has to be given in GeV, so that pT/GeV is dimensionless. Note that MadAnalysis assumes every single pT is given in GeV, so that you can in fact ignore the "/GeV" part.

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         6 years ago 

        Perfect. Thanks.

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           6 years ago 

          Most welcome sir...

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             6 years ago 

            Thanks sir

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               6 years ago 

              Most welcome sir

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                 6 years ago 

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