Abstract
On July 4th, 2012, CERN announced the discovery of a new particle, with properties quite similar to those expected from the Standard Model for the Higgs boson. The observation was carried out by the ATLAS and CMS collaborations, analysing the proton-proton collisions produced at the Large Hadron Collider (LHC), at energies of 7 and 8 \(\mathrm {TeV}\). More data were collected since then, confirming that indeed the long-sought Higgs boson was finally found. In this document, the main characteristics of this particle are summarized, together with the most significant measurements of its properties, obtained from a combined analysis of the ATLAS and CMS data recorded at 7 and 8 \(\mathrm {TeV}\), during the Run-I, in the years 2010–12. The mass of the Higgs boson is \(m_H\simeq 125~\mathrm {GeV}\). The measured cross-section, couplings, and spin-parity status are compatible with Standard Model expectations. The most recent measurements, based on the Run-II data at a collision energy of 13 \(\mathrm {TeV}\), won’t be covered in this document, as a combination of the two experiments is not available yet.
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Notes
- 1.
In the present document, charged leptons (\(\ell ^\pm \)), are meant to be electrons (\(e^\pm \)) or muons (\(\mu ^\pm \)), which can cross the detector without decaying, and therefore can be identified. The \(\tau \)-leptons are not considered, as they decay very close to the interaction vertex, making their identification more challenging.
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Fanti, M. (2018). The Discovery of the Higgs Boson and Most Significant Measurements at the LHC. In: Bortignon, P., Lodato, G., Meroni, E., Paris, M., Perini, L., Vicini, A. (eds) Toward a Science Campus in Milan. CDIP 2017. Springer, Cham. https://doi.org/10.1007/978-3-030-01629-6_8
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DOI: https://doi.org/10.1007/978-3-030-01629-6_8
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