Kinematic bias on centrality selection of jet events in pPb collisions at the LHC
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Título: | Kinematic bias on centrality selection of jet events in pPb collisions at the LHC |
Autor/a: | Armesto Pérez, Néstor Gülhan, Doğa Can Milhano, José Guilherme Teixeira da Almeida |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
Data: | 2015 |
Editor: | Elsevier |
Cita bibliográfica: | Armesto, N., Gülhan, D. and Milhano, J., 2015. Kinematic bias on centrality selection of jet events in pPb collisions at the LHC. Physics Letters B, 747, 441-445 |
Resumo: | Centrality selection has been observed to have a large effect on jet observables in pPb collisions at the Large Hadron Collider, stronger than that predicted by the nuclear modification of parton densities. We study to which extent simple considerations of energy–momentum conservation which link the hard process with the underlying event that provides the centrality estimator, affect jets observables in such collisions. We develop a simplistic approach that considers first the production of jets in a ppcollision as described by PYTHIA. From each ppcollision, the value of the energy of the parton from the proton participating in the hard scattering is extracted. Then, the underlying event is generated simulating a pPb collision through HIJING, but with the energy of the proton decreased according to the value extracted in the previous step, and both collisions are added. This model is able to capture the bulk of the centrality effect for central to semicentral collisions, for the two available sets of data: dijets from the CMS Collaboration and single jets from the ATLAS Collaboration. As expected, the model fails for peripheral collisions where very few nucleons from Pb participate |
Versión do editor: | http://dx.doi.org/10.1016/j.physletb.2015.06.032 |
URI: | http://hdl.handle.net/10347/21371 |
DOI: | 10.1016/j.physletb.2015.06.032 |
ISSN: | 0370-2693 |
E-ISSN: | 1873-2445 |
Dereitos: | © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) |
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