Application of vertex and mass constraints in track-based alignment

J. Amoraal, J. Blouw, S. Blusk, S. Borghi, M. Cattaneo, N. Chiapolini, G. Conti, M. Deissenroth, F. Dupertuis, R. Van Der Eijk, V. Fave, M. Gersabeck, A. Hicheur, W. Hulsbergen, D. Hutchcroft, A. Kozlinskiy, R. W. Lambert, F. MacIuc, R. Märki, M. MartinelliM. Merk, M. Needham, L. Nicolas, J. Palacios, C. Parkes, A. Pellegrino, S. Pozzi, G. Raven, E. Rodrigues, C. Salzmann, M. Schiller, O. Schneider, E. Simioni, O. Steinkamp, J. Van Tilburg, N. Tuning, U. Uwer, S. Vecchi, S. Viret

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The software alignment of planar tracking detectors using samples of charged particle trajectories may lead to global detector distortions that affect vertex and momentum resolution. We present an alignment procedure that constrains such distortions by making use of samples of decay vertices reconstructed from two or more trajectories and putting constraints on their invariant mass. We illustrate the method by using a sample of invariant-mass constrained vertices from D0→K-π+ decays to remove a curvature bias in the LHCb spectrometer. © 2013 Elsevier B.V.
    Original languageEnglish
    Pages (from-to)48-55
    Number of pages7
    JournalNuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
    Volume712
    DOIs
    Publication statusPublished - 2013

    Keywords

    • Curvature bias
    • Detector alignment
    • Vertex fit

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