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Download The Higgs Boson Discovery at the Large Hadron Collider by Roger Wolf (auth.) PDF

By Roger Wolf (auth.)

This publication offers a complete review of the sector of Higgs boson physics. It bargains the 1st in-depth assessment of the full ends up in reference to the invention of the Higgs boson at CERN’s huge Hadron Collider and in accordance with the total dataset for the years 2011 to 2012. the basic strategies and ideas of Higgs physics are brought and the $64000 searches ahead of the appearance of the massive Hadron Collider are in brief summarized.

Lastly, the invention and primary mensuration of the saw particle during the CMS test are mentioned intimately and in comparison to the implications received within the ATLAS experiment.

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The Higgs Boson Discovery at the Large Hadron Collider

This booklet offers a accomplished assessment of the sphere of Higgs boson physics. It bargains the 1st in-depth overview of the total ends up in reference to the invention of the Higgs boson at CERN’s huge Hadron Collider and in line with the whole dataset for the years 2011 to 2012. the basic innovations and rules of Higgs physics are brought and the real searches ahead of the appearance of the massive Hadron Collider are in brief summarized.

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Up to this point the main issue of the model was, that local gauge symmetries require all gauge boson fields to be massless, while the W + , W − and Z bosons of the weak interaction have been measured to be massive. This finding implies that the SU (2) L symmetry can not be manifest in the Lagrangian density. The symmetry can still be immanent, but hidden, if it is broken in the energy ground state of the system, which corresponds to the quantum vacuum. Since all fields and interactions in the Lagrangian density up to this point obey the SU (2) L symmetry the incorporation of an energy ground state, which breaks the symmetry implied the postulation of a new weak isospin doublet field, φ, with a self-coupling and a potential imparting this property to the quantum vacuum.

This coupling is ∝ m f . • The vacuum expectation value, v, is developed in the lower component of φ. This only allows to give mass terms to the lower components of the fermion doublets. In the minimal SM, mass terms for the upper components of the fermion doublets can be obtained from the charge conjugate of φ, φc . This is not possible in supersymmetric extensions of the SM, were φ has to fit into the structure of a larger multiplet. These non-trivial points extend the Weinberg-Salam model of electroweak interactions to the electroweak sector of the SM as a complete theory.

It is a main ingredient of the Higgs mechanism. 2 36 2 The Higgs Boson in the Standard Model of Particle Physics There are a few concluding remarks on the special choice of the Goldstone potential, which might have appeared arbitrary on first sight: • The Goldstone potential as chosen above leads to a symmetry breaking vacuum expectation value in the theory, which is a prerequisite of the model. It only depends on |φ| and does not distinguish any direction in space. Furthermore it does not lead to negative infinite energies, which is another prerequisite for the theory to be stable.

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