Posts by Collection

outreach

Hiukkasen valoa - Particle’s light

I was presenting a mobile LHC exhibition to general public in Jyväskylä during the City of Light event in 2014.

ALICE underground guide

I took the ALICE underground guide training on 2015 and took some groups to tours on 2015-2016.

Large Koopa Collider

I made a representation of Large Hadron Collider in Super Mario Maker 2.

Jetting through a droplet of matter from the early universe

I wrote an outreach article about the results of my dijet jet shape study that was published as a CMS physics briefing on March 2021.

Exit through the microscopic gift shop

I wrote an outreach article about the results of my dijet azimuthal asymmetry study that was published as a CMS physics briefing on December 2022.

Let’s smash the proton

I was helping professor Kunnawalkam Elayavalli with their outreach workshop directed for high school students in summer 2023.

The quantum optician

I wrote an outreach article about the results of my energy-energy correlator study in PbPb collisions that was published as a CMS physics briefing on July 2024.

publications

Jet transverse fragmentation momentum from h–h correlations in pp and p–Pb collisions

Published in Nuclear and Particle Physics Proceedings, 2017

Conference proceedings of the jet fragmentation transverse momentum \(j_{\mathrm{T}}\) measurement. Related to the talk I gave at Hard Probes 2016.

Reference: J. Viinikainen for the ALICE Collaboration, "Jet transverse fragmentation momentum from h–h correlations in pp and p–Pb collisions", Nucl. Part. Phys. Proc. 289-290 (2017) 293 [1612.05475]

Jet fragmentation transverse momentum measurements from di-hadron correlations in \(\sqrt{s} = 7 \) TeV pp and \(\sqrt{s_{\mathrm{NN}}} = 5.02 \) TeV p-Pb collisions

Published in Journal of High Energy Physics, 2019

Measurement of jet fragmentation transverse momentum \(j_{\mathrm{T}}\) using di-hadron correlations.

Reference: ALICE Collaboration, "Jet fragmentation transverse momentum measurements from di-hadron correlations in \(\sqrt{s} = \) 7 TeV pp and \(\sqrt{s_{\mathrm{NN}}} = \) 5.02 TeV p-Pb collisions", JHEP 03 (2019) 169 [1811.09742]

Latest results on jet suppression and jet substructure in heavy-ion collisions with CMS

Published in Proceedings of Science, 2019

Conference proceedings of the summary talk I gave at LHCP 2019 about recent jet subtructure measurements.

Reference: J. Viinikainen for the CMS Collaboration, "Latest results on jet suppression and jet substructure in heavy-ion collisions with CMS", PoS LHCP2019 (2019) 219

In-medium modification of dijets in PbPb collisions at \(\sqrt{s_{\mathrm{NN}}} = 5.02 \) TeV

Published in Journal of High Energy Physics, 2021

Measurement of jet shapes for leading and subleading jets in dijet events as a function of \(x_{j}\).

Reference: CMS Collaboration, "In-medium modification of dijets in PbPb collisions at \(\sqrt{s_{\mathrm{NN}}} = \) 5.02 TeV", JHEP 05 (2021) 116 [2101.04720]

Studies of in-medium modification of dijets in PbPb collisions at 5.02 TeV with the CMS detector

Published in Acta Physica Polocina B Proceedings Supplement, 2023

Conference proceedings of the talk I gave in Quark Matter 2022 about two dijet measurements I did using data from the CMS experiment.

Reference: J. Viinikainen for the CMS Collaboration, "Studies of in-medium modification of dijets in PbPb collisions at 5.02 TeV with the CMS detector", Acta Phys. Polon. Supp. 16 (2023) 1

Azimuthal anisotropy of dijet events in PbPb collisions at \(\sqrt{s_{\mathrm{NN}}} = 5.02 \) TeV

Published in Journal of High Energy Physics, 2023

Measurement of dijet \(v_{n}\) components.

Reference: CMS Collaboration, "Azimuthal anisotropy of dijet events in PbPb collisions at \(\sqrt{s_{\mathrm{NN}}} = \) 5.02 TeV", JHEP 07 (2023) 139 [2210.08325]

Resolving medium properties using high-p_T jets with jet and in-jet correlations in PbPb collisions at 5.02 TeV with the CMS detector

Published in EPJ Web of Conferences, 2024

Conference proceedings of the talk I gave in Quark Matter 2023 about two dijet measurements I did using data from the CMS experiment.

Reference: J. Viinikainen for the CMS Collaboration, "Resolving medium properties using high-p_T jets with jet and in-jet correlations in PbPb collisions at 5.02 TeV with the CMS detector", EPJ Web Conf. 296 (2024) 11010

Minimizing selection bias in inclusive jets in heavy-ion collisions with energy correlators

Published in Physical Review Letters, 2025

Derivation of a scaling factor to minimize selection bias from energy-energy correlator measurements and simulation study to illustrate the scaling factor works.

Reference: C. Andres, J. Holguin, R. Kunnawalkam Elayavalli, J. Viinikainen, "Minimizing selection bias in inclusive jets in heavy-ion collisions with energy correlators", Phys. Rev. Lett. 134 (2025) 8, 082303 [2409.07514]

Observation of nuclear modification of energy-energy correlators inside jets in heavy ion collisions

Published in Physics Letters B, 2025

First ever measurement of energy-energy correlators in heavy ion collisions.

Reference: CMS Collaboration, "Observation of nuclear modification of energy-energy correlators inside jets in heavy ion collisions", Phys. Lett. B 866 (2025) 139556 [2503.19993]

Study of energy-energy correlator of jets in PbPb collisions at CMS

Published in EPJ Web of Conferences, 2025

Conference proceedings of the talk I gave in Hard Probes 2024 about the first energy-energy correlator measurement in heavy ion collisions I did using data from the CMS experiment.

Reference: J. Viinikainen for the CMS Collaboration, "Study of energy-energy correlator of jets in PbPb collisions at CMS", EPJ Web Conf. 339 (2025) 02007

Living on the edge: radius effects in the angular substructure of heavy-ion jets

Submitted to Physical Review D

Discussion about edge effects in jet subtructure measurements. Detailed examples are given in the case of energy-energy correlators.

Reference: C. Andres, J. Holguin, B. Kimelman, R. Kunnawalkam Elayavalli, J. Viinikainen, Z. Yang, "Living on the edge: radius effects in the angular substructure of heavy-ion jets", arXiv:2512.10026