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Search for New Physics in tt ̅ Final States with Additional Heavy-Flavor Jets with the ATLAS Detector pp 61–85Cite as

Reconstruction of Physics Objects

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

Abstract

This chapter describes the reconstruction of the main physics objects that are relevant for the analyses presented in this dissertation. The identification, reconstruction and calibration of electrons, muons, jets, b-jets and missing transverse energy is discussed in detail. A brief description of the systematic uncertainties associated with these physics objects is also included.

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Notes

  1. 1.

    The beam spot is defined as the spatial region around the interaction point where the profiles of the two beams overlap.

  2. 2.

    A jet is considered isolated when no other jet with \(p_{\mathrm {T}}> 7\,\mathrm{GeV}\) is found within a cone of radius \(\Delta R = 2.5 R\), where \(R = 0.4\) is the jet radius.

  3. 3.

    The reconstructed jets from the MC simulations are already calibrated with the LCW+JES scheme, which restores the reconstructed jet energy to that of the particle-level jet in the simulation.

  4. 4.

    The notation semileptonic is used to denote any decay chain of the type: \(B \rightarrow X+\mu +\nu _{\mu }\). Decays in the electron channel don’t require a special treatment since the electron energy is deposited in the calorimeter and clustered into the jet.

  5. 5.

    The decay length is divided by its error to obtain the decay length significance, \(L/\sigma _L\), in order to reduce the effect of poorly-measured vertices.

  6. 6.

    Dedicated algorithms to identify c-jets are also available [22]. In the context of this dissertation, c-tagging refers to mistakenly b-tagging a c-jet.

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Authors and Affiliations

  1. Instituto de Física de Altas Energías, Universitat Autónoma de Barcelona, Bellaterra, Barcelona, Spain

    Javier Montejo Berlingen

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  1. Javier Montejo Berlingen
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Correspondence to Javier Montejo Berlingen .

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Montejo Berlingen, J. (2016). Reconstruction of Physics Objects. In: Search for New Physics in tt ̅ Final States with Additional Heavy-Flavor Jets with the ATLAS Detector. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-41051-7_4

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