Conveners
Parallels: Small and Intermediate system
- Weiyao Ke (Central China Normal University)
Parallels: Small and Intermediate system
- Anne Marie Sickles (Univ. Illinois at Urbana Champaign (US))
Parallels: Small and Intermediate system
- Yi Chen (Vanderbilt University)
Parallels: Small and Intermediate system
- Prithwish Tribedy (Brookhaven National Lab)
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Patrik Novotny (Weizmann Institute of Science (IL))23/06/2026, 08:301Oral presentation
By colliding protons with oxygen ions, the LHC enables studies of fundamental properties of matter at extraordinary range of energy scales of ~10 TeV. The recent p+O collisions at the LHC reproduce key features of PeV cosmic-ray interactions with the Earth’s atmosphere. Interpreting data from ground-based cosmic-ray detectors relies on detailed simulations of hadronic interactions at TeV-scale...
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Joonsuk Bae (Sungkyunkwan University (KR))23/06/2026, 08:502Oral presentation
Heavy-ion collisions are primarily studied to investigate the properties of hot and dense primordial nuclear matter, known as the quark–gluon plasma (QGP). However, recent observations of hydrodynamic flow–like behavior in pp and p–Pb collisions at the LHC suggest the possible formation of QGP droplets even in the smallest collision systems. To bridge the multiplicity gap between small and...
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Vipul Pant (University of Illinois Chicago (US))23/06/2026, 09:101Oral presentation
High-$p_{T}$ charged-particle suppression in heavy-ion collisions like PbPb, quantified by the nuclear modification factor $R_{AA}$, is a key signature of parton energy loss in quark-gluon plasma. However, it remains inconclusive in smaller systems like pPb. The first oxygen-oxygen run at the LHC provides a unique opportunity to study this suppression dependence on system size. We present the...
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Nicolas Strangmann (Goethe University Frankfurt (DE))23/06/2026, 09:301Oral presentation
Energy loss of high-momentum partons is one of the key signatures of the quark-gluon plasma formed in heavy-ion collisions.
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Through measurements of the nuclear modification factor $R_{\rm AA}$, where a strong suppression of high $p_{\text{T}}$ particle yields is observed, parton energy loss has been confirmed in Pb--Pb collisions at the LHC.
However, in small collision systems, like pp and... -
Sierra Cantway (Yale University (US))23/06/2026, 10:20Oral presentation
Jet substructure measurements in heavy-ion (HI) collisions constrain the microscopic interaction mechanisms between energetic partons and the quark–gluon plasma. Jet-quenching models predict modifications of the jet-hadrochemical composition in heavy-ion collisions due to jet-medium interactions, allowing measurements of identified particles in jets to help discriminate between different...
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Mr Alberto Caliva (Universita e INFN, Salerno (IT))23/06/2026, 10:40Oral presentation
At the LHC, the ALICE experiment has observed that the yield ratios of strange to non-strange hadrons increase with charged-particle multiplicity at midrapidity, following a smooth evolution across collision systems, spanning over three orders of magnitude in multiplicity and saturating in central Pb–Pb events. Various models have been proposed to explain the origin of strangeness production...
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Lucia Anna Tarasovicova (Pavol Jozef Safarik University (SK))23/06/2026, 11:00Oral presentation
Measurements in pp and p-Pb collisions have revealed that small collision systems exhibit several features traditionally attributed to heavy-ion collisions, including the smooth increase of the strange hadron yields with the collision multiplicity (strangeness enhancement). However, the microscopic origin of this phenomenon in small systems remains an open question. In particular, the relative...
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Hao-Ren Jheng (Massachusetts Inst. of Technology (US))23/06/2026, 11:20Oral presentation
The new sPHENIX collider detector experiment features a unique tracking system capable of streaming readout, enabling the collection of very large, unbiased p+p datasets previously not available at RHIC. sPHENIX recorded over 10 pb$^{-1}$ of p+p collisions at 200 GeV in this readout scheme. Using these datasets, new measurements of the transverse-momentum and multiplicity dependence of strange...
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Yen-Jie Lee (Massachusetts Inst. of Technology (US))23/06/2026, 11:402Oral presentation
High-energy nuclear collisions reveal the QCD radiation and hadronization in the most complex many-body environment accessible in the laboratory. To interpret these phenomena, it is essential to establish a precise understanding of the corresponding vacuum dynamics. Electron-positron annihilation provides a uniquely clean setting where the initial state is color neutral and free of hadronic...
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Arjun Srinivasan Kudinoor (Massachusetts Institute of Technology)23/06/2026, 14:00Oral presentation
Jet partons can trigger high momentum-exchange $2 \rightarrow 2$ elastic scatterings (aka Molière scatterings) with quark- and gluon-like quasiparticles in QGP, making jets valuable probes with which to study the microscopic structure of QGP. We describe how we have implemented such Molière scatterings in the Hybrid Model of jet quenching. We then describe how measurements of the Soft Drop...
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Arthur Lin23/06/2026, 14:202Oral presentation
Jets produced in a relativistic collision of oxygen nuclei plow through and interact with the droplet of quark-gluon plasma formed in the same collision. As they traverse a droplet of QGP, high-energy partons within these jets lose energy to and excite wakes in the QGP, and elastically scatter off of quark- and gluon-like quasiparticles in the QGP droplet. All these interactions modify the...
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Shengquan Tuo (Vanderbilt University (US))23/06/2026, 14:401Oral presentation
The average $N_{part}$ and $N_{coll}$ are similar between minimum-bias OO collisions and peripheral PbPb collisions with 70-90% centrality. After accounting for event selection and geometric biases, no significant jet quenching is observed in 70–90% PbPb collisions. In marked contrast, a clear signature of jet quenching is observed in minimum-bias OO collisions. This difference, despite...
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Rafet Kavak (CERN)23/06/2026, 15:001Oral presentation
Light-ion collisions at the LHC provide access to parton energy loss in compact systems with a controlled initial geometry and a direct pp baseline at the same energy. In 2025, ATLAS recorded $8~\mathrm{nb}^{-1}$ of O+O and $1~\mathrm{nb}^{-1}$ of Ne+Ne collisions at $\sqrt{s_{\mathrm{NN}}}=5.36~\mathrm{TeV}$, matching a previously collected $400~\mathrm{pb}^{-1}$ $pp$ reference sample. Using...
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Blair Daniel Seidlitz (Columbia University (US))23/06/2026, 15:501Oral presentation
Oxygen-oxygen (O+O) and Neon-neon (Ne+Ne) collisions offer a unique opportunity to observe the onset of significant parton-QGP interactions which lead to parton shower modification, and to investigate such effects in the presence of the smaller event backgrounds provided by light ion collisions. At the same time, systematic measurements of multiplicity, mean pT, and collective flow (quantified...
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Sruthy Jyothi Das (University of Illinois Chicago (US))23/06/2026, 16:101Oral presentation
High-momentum charged particles originate from the fragmentation and hadronization of partons that undergo hard scattering, and their yields are consequently sensitive to parton energy loss in the QGP. The presence of such energy loss in small collision systems has long been an open question in heavy-ion physics. Recently, the CMS experiment reported a significant suppression of...
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Maowu Nie (Shandong University (CN)), Dr Maowu Nie (Shandong University (SDU))23/06/2026, 16:30Oral presentation
Measurements of hard probes in O+O collisions are crucial for elucidating the limit of system size where the jet quenching signal is observable. To achieve high precision for such measurements one needs to minimize model dependence, selection bias, and nuclear parton distribution function (nPDF) effects. In this regard, coincidence observables provide particular advantages. We present...
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Cheng Xu (South China University of Technology)23/06/2026, 16:50Jet modification and medium responseOral presentation
The search for quark–gluon plasma (QGP)-like collectivity in small collision systems remains a central goal of high-energy nuclear physics. Recent results from O+O collisions suggest that strongly coupled, near-perfect-fluid behavior may emerge even in such small systems, motivating a detailed investigation of jet quenching at reduced system size. In this work, we study hadron and jet...
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