Abstract
This chapter discusses the extraction of the reconstruction, identification, and trigger efficiencies for prompt photons. The reconstruction efficiency is evaluated using Monte Carlo samples. The identification efficiency is evaluated for reconstructed photons using Monte Carlo samples modified by the observed differences with data. A data-driven method, using electrons from W decays, is also discussed. The trigger efficiency is estimated using collision data with a boot-strap method, using a series of triggers with different thresholds. Finally, the systematic uncertainties affecting the efficiency measurements are estimated.
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Notes
- 1.
These data were collected immediately after the 880Â nb\(^{-1}\) sample, under similar conditions. Several aspects of the photon triggers changed after the 880Â nb\(^{-1}\)sample was collected, motivating the cutoff for the photon sample. For the electron sample, there is no apparent bias introduced by the additional data.
- 2.
The tight electron identification criteria are similar to the tight criteria for photons, but include some additional variables related to the electron track. For more details on the electron selection criteria, see [2].
- 3.
This is equivalent to a transverse mass requirement of 42Â GeV for events that just satisfy the track-\(p_{\text{T}}\) and \(E_{\text{T}}^{\text{miss}}\) requirements.
- 4.
This problem has since been corrected, and does not affect the data collected in 2011.
- 5.
There is no out-of-time pileup present in the 880Â nb\(^{-1}\) data sample used in this measurement.
References
ATLAS Collaboration, G. Aad et al., Measurement of the production cross section for W-bosons in association with jets in pp collisions at \(\text{sqrt(s)} = 7\) TeV with the ATLAS detector. Phys. Lett. B698, 325–345 (2011). arXiv:1012.5382 [hep-ex]
ATLAS Collaboration, G. Aad et al., Expected performance of the ATLAS experiment, detector, trigger and physics, CERN-OPEN-2008-020 (2008). arXiv:0901.0512 [hep-ex]
M. Aleksa et al., ATLAS combined testbeam: computation and validation of the electronic calibration constants, ATL-LARG-PUB-2006-003 (2006). http://cdsweb.cern.ch/record/942528
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Hance, M. (2013). Measurement of the Reconstruction, Identification, and Trigger Efficiencies . In: Photon Physics at the LHC. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33062-9_5
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DOI: https://doi.org/10.1007/978-3-642-33062-9_5
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