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Centrality determination in heavy-ion collisions with the LHCb detector

https://doi.org/10.1088/1748-0221/17/05/P05009

Aaij, R. ; Abellán Beteta, C. ; Ackernley, T. ; Adeva, B. ; Adinolfi, M. ; Afsharnia, H. ; Aidala, C.A. ; Aiola, S. ; Ajaltouni, Z. ; Akar, S. ; et al ( May 2022 , Journal of Instrumentation)

Abstract The centrality of heavy-ion collisions is directly related to the created medium in these interactions. A procedure to determine the centrality of collisions with the LHCb detector is implemented for lead-lead collisions at √ s NN = 5 TeV and lead-neon fixed-target collisions at √ s NN = 69 GeV. The energy deposits in the electromagnetic calorimeter are used to determine and define the centrality classes. The correspondence between the number of participants and the centrality for the lead-lead collisions is in good agreement with the correspondence found in other experiments, and the centrality measurements for the lead-neon collisions presented here are performed for the first time in fixed-target collisions at the LHC.
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Identification of charm jets at LHCb

https://doi.org/10.1088/1748-0221/17/02/P02028

Aaij, R. ; Abdelmotteleb, A.S.W. ; Abellán Beteta, C. ; Abudinen Gallego, F.J. ; Ackernley, T. ; Adeva, B. ; Adinolfi, M. ; Afsharnia, H. ; Agapopoulou, C. ; Aidala, C.A. ; et al ( February 2022 , Journal of Instrumentation)

Abstract The identification of charm jets is achieved at LHCb for data collected in 2015–2018 using a method based on the properties of displaced vertices reconstructed and matched with jets. The performance of this method is determined using a dijet calibration dataset recorded by the LHCb detector and selected such that the jets are unbiased in quantities used in the tagging algorithm. The charm-tagging efficiency is reported as a function of the transverse momentum of the jet. The measured efficiencies are compared to those obtained from simulation and found to be in good agreement.
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