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Reconstruct the $t\bar{t}$ kinematics

TODO

  1. Reconstruct the variables:

    • $M_t$

    • $M_{\bar{t}}$

    • $M_{W^+}$

    • $M_{W^-}$

    • Divide all in leptonic/hadronic and particle/antiparticle decays

    • fit a Breit-Wigner for each histogram (this is important to understand the magnitude of the non resonant decay)

    • Do a wider version of the plots to see the tails

    • Do the same plots for $\eta$ and $p_T$
    • Create and histogram containing all the possible $q\bar{q}$ couples and fill it with the hadronic W decays
    Optional
    • Multithreaded loop over events (or implement everything using the RDataframes)

Questions

  • Why the gluon fusion production (90%) dominate over the quark production (10%)?

    • At the LHC energy the bjorken variable $x=\frac{|q|^2}{2p_{in}^{\mu} q_{\mu} } $ is small and for small X the gluon PDF is much higher than the quark PDF.

      For example, at the Tevatron, the CM energy was 1TeV and ttbar production was mainly from valence quarks


Info


Observation and doubts