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Introduction and Literature Review

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Study of Double Parton Scattering Using Four-Jet Scenarios

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

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Abstract

Our knowledge of the particle physics world is strongly connected to the formulation of the Standard Model (SM) [1]. The SM is a very successful theory which is able to describe a wide class of phenomenona undergone by elementary particles, by including a consistent picture of the interactions experienced by them. One of the considered interactions is called “strong interaction” and, as the name might suggest, it is the one with the largest intensity.

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Notes

  1. 1.

    The preliminary results have a reduced phase space, by selecting jets only in the central region, while the published results have an extended jet selection, covering the full pseudorapidity coverage available in CMS.

  2. 2.

    The action is the lagrangian integrated over the time.

  3. 3.

    The convention to indicate antiparticles is to take the name of the corresponding particle and to add a bar on top: for instance, u \(\rightarrow \) \(\bar{u}\), to be read “anti-u” or “u bar”.

  4. 4.

    This is the reason why gauge bosons are generally referred to as “mediators” of a specific interaction.

  5. 5.

    The concept of left- and right-handed particles concerns the relative direction of spin and of momentum of a particle: if they are opposite to each other, the particle is referred as left-handed, while if they point to the same direction, it is called right-handed. This feature is closely related to the concepts of helicity and chirality.

  6. 6.

    The weak isospin values are symmetric for the corresponding antifermions.

  7. 7.

    These factors, which implement the virtual corrections of real emissions due to the 1/z part of the splitting functions, are called non-Sudakov form factors, in contrast with the Sudakov form factors, which, instead, use emissions expressed by 1/(1–z) terms (see Chap. 2).

  8. 8.

    The dependence of the potential includes also a Coulomb term proportional to 1/r for small distances, but it can be neglected at large distances.

  9. 9.

    The other sequential recombination algorithms differs from the anti-\(k_{\text {T}}\) only in the exponent: p \(=\) 1 for the \(k_{\text {T}}\) algorithm [52] and p \(=\) 0 for the Cambridge-Aachen algorithm [53].

  10. 10.

    This is referred to as “collinear factorization” and it is treated in more detail in Chap. 2.

  11. 11.

    A hadronic collision is described in full detail in Chap. 2.

  12. 12.

    Details of the experimental techniques will be given in Chap. 5.

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  1. DESY-CMS, Hamburg, Germany

    Paolo Gunnellini

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  1. Paolo Gunnellini
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Gunnellini, P. (2016). Introduction and Literature Review. In: Study of Double Parton Scattering Using Four-Jet Scenarios. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-22213-4_1

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