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Calibration of the LHCb electromagnetic calorimeter using the technique of neutral pion invariant mass reconstruction

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Abstract

Calibration of the electromagnetic calorimeter for the LHCb experiment is aimed at measuring the electron and photon energies with an accuracy of 2% or better. A number of calibration techniques are sequentially used for this purpose. One of these techniques is based on reconstruction of the π0 meson invariant mass in a two-photon decay. Using this procedure, it is possible to calibrate the electromagnetic calorimeter in the transverse energy range of 300–1500 MeV. An important advantage of this technique is its independence of the states of the other LHCb spectrometer systems. Statistics sufficient for attaining the declared purpose can be rapidly acquired owing to the large cross section of neutral pion production in deep inelastic events. The algorithm has been implemented as a part of the LHCb software. The calibration procedure using neutral pions takes no more than 2 weeks and helps achieve the required accuracy.

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Authors and Affiliations

  1. Alikhanov Institute for Theoretical and Experimental Physics, ul. Bol’shaya Cheremushkinskaya 25, Moscow, 117218, Russia

    I. M. Belyaev, D. Yu. Golubkov & D. V. Savrina

  2. Skobel’tsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992, Russia

    V. Yu. Egorychev & D. V. Savrina

Authors
  1. I. M. Belyaev
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  2. D. Yu. Golubkov
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  3. V. Yu. Egorychev
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  4. D. V. Savrina
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Corresponding author

Correspondence to D. V. Savrina.

Additional information

Original Russian Text © I.M. Belyaev, D.Yu. Golubkov, V.Yu. Egorychev, D.V. Savrina, 2014, published in Pribory i Tekhnika Eksperimenta, 2014, No. 1, pp. 46–52.

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Belyaev, I.M., Golubkov, D.Y., Egorychev, V.Y. et al. Calibration of the LHCb electromagnetic calorimeter using the technique of neutral pion invariant mass reconstruction. Instrum Exp Tech 57, 33–39 (2014). https://doi.org/10.1134/S0020441213060171

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  • DOI: https://doi.org/10.1134/S0020441213060171

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