[{"nid":"12604","nid_1":"13214","title":"Dijet invariant mass of charged-particle jets in pp and p-Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV","field_draft_arxiv":"\u003Ca href=\u0022https:\/\/arxiv.org\/abs\/2604.07961\u0022\u003Ehttps:\/\/arxiv.org\/abs\/2604.07961\u003C\/a\u003E","field_paper_abstract":"\u003Cp\u003EThe ALICE collaboration presents the first measurement of the dijet invariant mass spectra of charged-particle jets in pp and p-Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV. Charged particles in the mid-pseudorapidity region, $|\u03b7| \u0026lt;~ 0.9$, are clustered into jets using the anti-$k_{\\rm T}$ algorithm with a resolution parameter $R = 0.4$. The leading and subleading jets are required to have a transverse momentum $p_{\\rm T} \u0026gt; 20$ GeV$\/c$ and to be contained within $\\left|\u03b7_{\\rm jet}\\right| \u0026lt;~ 0.5$. The dijet invariant mass spectrum and the nuclear modification factor $R_{\\rm pA}$ are presented in the low-mass region of 75 to 150 GeV\/$c^2$. The nuclear modification factor for charged-particle dijet invariant mass is consistent with unity. This is in line with previous small-system jet studies. Comparisons with Monte Carlo simulations suggest that the low-mass region is sensitive to anti-shadowing effects on parton densities in the nucleus, however, the expected signal is subtle and below the present experimental sensitivity.\u003C\/p\u003E"},{"nid":"12398","nid_1":"13215","title":"Multiplicity dependence of prompt and non-prompt J\/$\u03c8$ production at midrapidity in pp collisions at $\\sqrt{s} = 13$ TeV","field_draft_arxiv":"\u003Ca href=\u0022https:\/\/arxiv.org\/abs\/2604.07968\u0022\u003Ehttps:\/\/arxiv.org\/abs\/2604.07968\u003C\/a\u003E","field_paper_abstract":"\u003Cp\u003EThe yields of prompt and non-prompt J\/$\u03c8$ and the fraction of non-prompt J\/$\u03c8$ are measured at midrapidity ($|y| \u0026lt;~ 0.9$) via the dielectron decay channel as a function of the midrapidity charged-particle multiplicity ($|\u03b7| \u0026lt;~ 0.9$) in pp collisions at $\\sqrt{s} = 13$ TeV. The J\/$\u03c8$ yields and the multiplicity are normalized by their average value in inelastic collisions. The multiplicity-dependent yield ratio between prompt J\/$\u03c8$ and D$^0$ is reported. The multiplicity is further divided into three azimuthal regions with respect to the J\/$\u03c8$ momentum: toward the J\/$\u03c8$ emission direction, transverse, or opposite to it. A stronger-than-linear increase of the self-normalized yields is observed for both prompt and non-prompt J\/$\u03c8$ production, with similar trends. This behaviour is also observed in the toward region, while a weaker increase is observed in the transverse and away regions.\u003C\/p\u003E"},{"nid":"8431","nid_1":"13213","title":"Wave-Function Femtometry: Hypertriton - The Ultimate Halo Nucleus","field_draft_arxiv":"\u003Ca href=\u0022https:\/\/arxiv.org\/abs\/2604.07949\u0022\u003Ehttps:\/\/arxiv.org\/abs\/2604.07949\u003C\/a\u003E","field_paper_abstract":"\u003Cp\u003EThe interaction between nucleons and hyperons - baryons containing a strange quark - is key to understanding the properties of dense nuclear matter, such as that expected in the interior of neutron stars. Direct scattering experiments are hindered by the short lifetime of hyperons, prompting the study of hypernuclei - bound states of nucleons and hyperons - as an alternative approach. The lightest known hypernucleus, the hypertriton ($^3_\u039b$H), is a weakly bound state composed of a proton, a neutron and a $\u039b$ hyperon, and is believed to exhibit a halo-like structure with the $\u039b$ being loosely bound to a deuteron core. Based on the first measurement of hypertriton production in proton-proton collisions at the CERN Large Hadron Collider (LHC), its halo structure is confirmed. A successful description of the hypertriton production yield within the nuclear coalescence framework enables an estimation of the $\u039b$ separation from the deuteron core as $9.54^{+2.67}_{-1.11}$ fm.\u003C\/p\u003E\n"},{"nid":"11824","nid_1":"13176","title":"Measurement of the transverse-momentum fraction of strange hadrons from jet-like correlation structures in pp collisions at $\\sqrt{s} = 13$ TeV","field_draft_arxiv":"\u003Ca href=\u0022https:\/\/arxiv.org\/abs\/2603.19387\u0022\u003Ehttps:\/\/arxiv.org\/abs\/2603.19387\u003C\/a\u003E","field_paper_abstract":"\u003Cp\u003EThe first measurements of the average transverse-momentum fraction ($\\langle z \\rangle$) as a function of transverse momentum ($p_{\\rm T}$) for strange baryons ($\u039b$ and $\\bar\u039b$) and strange mesons ($K_{\\rm S}^0$), produced in mini-jets defined through angular correlations in pp collisions at $\\sqrt{s} = 13$ TeV, are reported by the ALICE Collaboration at the LHC. The observable is obtained using a novel method, where the angular correlation between the strange hadrons and inclusive charged hadrons is weighted by the $p_{\\rm T}$ of correlated particles at small angular distance. As a function of strange particles\u0027 $p_{\\rm T}$, the results reveal a flat trend for strange mesons and a decreasing trend for strange baryons in the measured $p_{\\rm T}$ region, indicating distinct hadronization mechanisms for $K_{\\rm S}^0$ and $\u039b$($\\bar\u039b$). The measurements are compared to Monte Carlo models, namely PYTHIA~8 (with both Monash and Color Rope tunes) and the AMPT (A Multi-Phase Transport) model with string melting. None of these models provides a satisfactory description of the $\\langle z \\rangle$ distributions at low and intermediate $p_{\\rm T}$.\u003C\/p\u003E"},{"nid":"11022","nid_1":"13175","title":"Production of $\u039e$ and $\u03a9$ hyperons in high-multiplicity proton-proton collisions at $\\sqrt{s}$ = 13 TeV","field_draft_arxiv":"\u003Ca href=\u0022https:\/\/arxiv.org\/abs\/2603.19374\u0022\u003Ehttps:\/\/arxiv.org\/abs\/2603.19374\u003C\/a\u003E","field_paper_abstract":"\u003Cp\u003EThis paper presents the first measurements of $\u039e$ and $\u03a9$ hyperon yields at the highest multiplicities reached in pp collisions at $\\sqrt{s} = 13$ TeV. This measurement exploits the high-multiplicity pp collisions collected by ALICE with dedicated triggers. The selected collisions are characterised by about 30 charged particles per unit of rapidity, over four times more than in minimum-bias pp collisions at the same centre-of-mass energy, and about twice as many as in minimum-bias p-Pb or very peripheral Pb-Pb collisions at similar energies. The production yields and average transverse momenta of the hyperons agree with trends indicated by previous measurements in pp collisions at lower multiplicities. The difference in average transverse momenta between pp and p-Pb collisions, observed with the new high-multiplicity pp data, provides additional insight into the underlying particle production mechanisms in small systems. The results support a strong correlation between multi-strange hadron production and final-state multiplicity regardless of the collision system at the LHC energies, extending this observation to the highest multiplicity reached in pp collisions. The comparison with several state-of-the-art models (Pythia8.2 with the Monash 2013 tune, Pythia8.2 with Ropes, and EPOS4) suggests that the description of strange-hadron production is improved by recently introduced features such as interactions between overlapping strings in Pythia8.2 with Ropes and the collective expansion of high-density string regions in EPOS4.\u003C\/p\u003E"}]