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The Top Quark in the Context of the Standard Model

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Top Quark Pair Production

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

The analyses presented in this thesis deal with measurements of the production of top quark pairs at the Large Hadron Collider, as predicted in the framework of the Standard Model of Particle Physics. The first part of this chapter will focus on the theoretical framework in general, while the second part will describe the production and properties of top quarks in more detail and give an overview of the current experimental knowledge of top quark production.

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Notes

  1. 1.

    While 23 % are dark matter and the remaining 72 % dark energy.

  2. 2.

    i.e. spin 1/2 particles.

  3. 3.

    Where \(Q\) denotes the electric charge and \(T_3\) the third component of the weak isospin.

  4. 4.

    A massless fermion is identified as left-handed if the direction of motion and spin are opposite to each other, and as right-handed otherwise. For massive leptons the handedness is defined as the chirality, describing the behavior under right- and left-handed transformations.

  5. 5.

    Also called the weak mixing angle.

  6. 6.

    ATLAS and CMS.

  7. 7.

    At 95 % C.L.

  8. 8.

    And a ninth combination as a color singlet, which is not realized in nature.

  9. 9.

    Unlike their massless equivalent in electroweak theory, the charge neutral photon \(\gamma \).

  10. 10.

    Or anti-up and anti-down valence quarks from the antiproton.

  11. 11.

    \(m_t = 172.5\) GeV is assumed for the Monte Carlo generated samples in the experimental analyses presented and hence the cross section is calculated accordingly.

  12. 12.

    A similar calculation using the MSTW2008NNLO PDF set, which is better comparable to the other predictions, yields \(\sigma _{t\bar{t}} = 165.8^{+4.4}_{-7.0}(scale)\pm 9.1(PDF) pb\) [27].

  13. 13.

    Or sometimes as semileptonic event, although the decays themselves are either strictly hadronic or strictly leptonic.

  14. 14.

    Including events with electrons or muons and jets, as well as events with taus if the tau lepton decays leptonically.

  15. 15.

    Which also includes the \(W\) boson decays \(W \rightarrow \tau \nu \rightarrow e/\mu \nu \nu \).

  16. 16.

    Again including leptonic tau decays.

  17. 17.

    As of March 2012.

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Authors and Affiliations

  1. Department of Physics, Yale University, Whitney Avenue 260, New Haven, CT, 06511, USA

    Anna Christine Henrichs

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  1. Anna Christine Henrichs
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Correspondence to Anna Christine Henrichs .

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Henrichs, A.C. (2014). The Top Quark in the Context of the Standard Model. In: Top Quark Pair Production. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-01487-6_2

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