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Likelihood-Based Approach to the Estimation of the Background Induced by the Misidentification of a Jet as a Photon at pp Collider Experiment

  • PHYSICS OF ELEMENTARY PARTICLES AND ATOMIC NUCLEI. EXPERIMENT
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Abstract

The misidentification of a jet as a photon typically arises from the decay of the neutral mesons. The background induced by this misidentification is commonly estimated using the two-dimensional sideband method at collider experiments. This study presents an alternative maximum likelihood approach that does not require optimisation of the boundaries of the control regions, resulting in much faster estimation. The method considers the shapes of data, signal and all other backgrounds, which increases the estimation accuracy for consequent differential cross-section measurements.

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Notes

  1. Cylindrical coordinates (\(r\), \(\phi \)) are used in the transverse plane, \(\phi \) being the azimuthal angle around the \(z\)-axis. The pseudorapidity is defined in terms of the polar angle \(\theta \) as \(\eta \) = –ln\(\tan (\theta /2)\).

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Funding

This work is supported by the Russian Science Foundation under grant 21-72-10113.

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Authors and Affiliations

  1. National Research Nuclear University MEPhI, 115409, Moscow, Russia

    K. Kazakova, E. Soldatov & D. Pyatiizbyantseva

  2. Moscow State University, 119991, Moscow, Russia

    K. Savelyev

Authors
  1. K. Kazakova
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  2. E. Soldatov
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  3. D. Pyatiizbyantseva
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  4. K. Savelyev
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Correspondence to K. Kazakova.

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Kazakova, K., Soldatov, E., Pyatiizbyantseva, D. et al. Likelihood-Based Approach to the Estimation of the Background Induced by the Misidentification of a Jet as a Photon at pp Collider Experiment. Phys. Part. Nuclei Lett. 20, 1194–1197 (2023). https://doi.org/10.1134/S1547477123050424

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