dc.contributor.author | ALICE collaboration | |
dc.date.accessioned | 2021-11-11T10:14:36Z | |
dc.date.available | 2021-11-11T10:14:36Z | |
dc.date.issued | 2021 | |
dc.identifier.citation | ALICE collaboration. (2021). First measurements of N-subjettiness in central Pb-Pb collisions at √sNN = 2.76 TeV. <i>Journal of High Energy Physics</i>, <i>2021</i>(10), Article 3. <a href="https://doi.org/10.1007/JHEP10(2021)003" target="_blank">https://doi.org/10.1007/JHEP10(2021)003</a> | |
dc.identifier.other | CONVID_101858162 | |
dc.identifier.uri | https://jyx.jyu.fi/handle/123456789/78614 | |
dc.description.abstract | The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb-Pb collisions at centre-of-mass energies of √s = 7 TeV and √sNN = 2.76 TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum. The results are presented for jets with a resolution parameter of R = 0.4 and charged jet transverse momentum of 40 ≤ pT,jet ≤ 60 GeV/c, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the τ2/τ1 observable for track-based jets in Pb-Pb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of τ2/τ1, together with the splitting aperture angle ∆R, are also performed in pp collisions at √s = 7 TeV for inclusive jets. These results are compared with PYTHIA calculations at √s = 7 TeV, in order to validate the model as a vacuum reference for the Pb-Pb centre-of-mass energy. The PYTHIA references for τ2/τ1 are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in Pb-Pb collisions compared to pp collisions. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.publisher | Springer | |
dc.relation.ispartofseries | Journal of High Energy Physics | |
dc.rights | CC BY 4.0 | |
dc.title | First measurements of N-subjettiness in central Pb-Pb collisions at √sNN = 2.76 TeV | |
dc.type | article | |
dc.identifier.urn | URN:NBN:fi:jyu-202111115632 | |
dc.contributor.laitos | Fysiikan laitos | fi |
dc.contributor.laitos | Department of Physics | en |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | |
dc.type.coar | http://purl.org/coar/resource_type/c_2df8fbb1 | |
dc.description.reviewstatus | peerReviewed | |
dc.relation.issn | 1126-6708 | |
dc.relation.numberinseries | 10 | |
dc.relation.volume | 2021 | |
dc.type.version | publishedVersion | |
dc.rights.copyright | © CERN, for the benefit of the ALICE Collaboration.
Article funded by SCOAP3 | |
dc.rights.accesslevel | openAccess | fi |
dc.subject.yso | hiukkasfysiikka | |
dc.format.content | fulltext | |
jyx.subject.uri | http://www.yso.fi/onto/yso/p15576 | |
dc.rights.url | https://creativecommons.org/licenses/by/4.0/ | |
dc.relation.doi | 10.1007/JHEP10(2021)003 | |
dc.type.okm | A1 | |