Bibliographische Detailangaben
| Titel: |
Measurement of the nuclear modification factor of b-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector. |
| Autoren: |
Aad, G., Abbott, B., Abbott, D. C., Abeling, K., Abidi, S. H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Hoffman, A. C. Abusleme, Acharya, B. S., Achkar, B., Adam, L., Bourdarios, C. Adam, Adamczyk, L., Adamek, L., Addepalli, S. V., Adelman, J., Adiguzel, A., Adorni, S. |
| Quelle: |
European Physical Journal C -- Particles & Fields; May2023, Vol. 83 Issue 5, p1-32, 32p |
| Schlagwörter: |
DETECTORS, ENERGY dissipation, MUONS, HEAVY-ion atom collisions, JETS (Nuclear physics), MEASUREMENT |
| Abstract: |
This paper presents a measurement of b-jet production in Pb+Pb and pp collisions at s NN = 5.02 TeV with the ATLAS detector at the LHC. The measurement uses 260 pb - 1 of pp collisions collected in 2017 and 1.4 nb - 1 of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti- k t algorithm. The b-jets are identified from a sample of jets containing muons from the semileptonic decay of b-quarks using template fits of the muon momentum relative to the jet axis. In pp collisions, b-jets are reconstructed for radius parameters R = 0.2 and R = 0.4 , and only R = 0.2 jets are used in Pb+Pb collisions. For comparison, inclusive R = 0.2 jets are also measured using 1.7 nb - 1 of Pb+Pb collisions collected in 2018 and the same pp collision data as the b-jet measurement. The nuclear modification factor, R AA , is calculated for both b-jets and inclusive jets with R = 0.2 over the transverse momentum range of 80–290 GeV. The nuclear modification factor for b-jets decreases from peripheral to central collisions. The ratio of the b-jet R AA to inclusive jet R AA is also presented and suggests that the R AA for b-jets is larger than that for inclusive jets in central Pb+Pb collisions. The measurements are compared with theoretical calculations and suggest a role for mass and colour-charge effects in partonic energy loss in heavy-ion collisions. [ABSTRACT FROM AUTHOR] |
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