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Item type:Publication, Multiplicity dependence of charged-particle intra-jet properties in pp collisions at √s = 13 TeV(Springer Nature, 2024-10-01)The first measurement of the multiplicity dependence of intra-jet properties of leading charged-particle jets in proton–proton (pp) collisions is reported. The mean charged-particle multiplicity and jet fragmentation distributions are measured in minimum-bias and high-multiplicity pp collisions at center-of-mass energy s = 13 TeV using the ALICE detector. Jets are reconstructed from charged particles produced in the midrapidity region (|η|<0.9) using the sequential recombination anti-kT algorithm with jet resolution parameters R = 0.2, 0.3, and 0.4 for the transverse momentum (pT) interval 5–110 GeV/c. The high-multiplicity events are selected by the forward V0 scintillator detectors. The mean charged-particle multiplicity inside the leading jet cone rises monotonically with increasing jet pT in qualitative agreement with previous measurements at lower energies. The distributions of jet fragmentation function variables zch and ξch are measured for different jet-pT intervals. Jet-pT independent fragmentation of leading jets is observed for wider jets except at high- and low-zch values. The observed “hump-backed plateau” structure in the ξch distribution indicates suppression of low-pT particles. In high-multiplicity events, an enhancement of the fragmentation probability of low-zch particles accompanied by a suppression of high-zch particles is observed compared to minimum-bias events. This behavior becomes more prominent for low-pT jets with larger jet radius. The results are compared with predictions of QCD-inspired event generators, PYTHIA 8 with Monash 2013 tune and EPOS LHC. It is found that PYTHIA 8 qualitatively reproduces the jet modification in high-multiplicity events except at high jet pT. These measurements provide important constraints to models of jet fragmentation. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The Metropolitan Centralities of Lima (Peru) as an Inhabited Space: A Qualitative Approach(Universidad de Chile, 2023-01-01)Studies on centralities in recent decades in Latin America have privileged the analysis of the urban structure and have paid little attention to the analysis of the inhabited space. This, in turn, requires greater attention, especially in the temporal and spatial dimensions of practices. This article proposes to overcome these limitations through comparative analysis, taking as case studies two of the main metropolitan-scale centralities in Lima (Peru): The commercial area of Mesa Redonda, and Mercado Central, located in the historical center of the city, with high diversity of activities where formal and informal commercial activities predominate; and 2) the financial center of San Isidro, located in a high-income district of the city. The methodology consisted of intensive and multidisciplinary qualitative fieldwork. The article demonstrates how inadequacies are configured in everyday life in the two centralities from the temporal and spatial relationship between practices and the built environment. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Femtoscopic study of the proton-proton and proton-deuteron systems in heavy-ion collisions at the LHC(Elsevier, 2025)This work reports femtoscopic correlations of p–p (p–p) and p–d (p–d) pairs measured in Pb–Pb collisions at centerof-mass energy per nucleon √ 𝑠NN = 5.02 TeV in the ALICE Collaboration. A fit to the measured proton-proton correlation functions allows one to extract the dependence of the nucleon femtoscopic radius of the particleemitting source on the pair transverse mass (𝑚T ) and on the average charge particle multiplicity ⟨dNch∕d𝜂⟩ 1∕3 for three centrality intervals (0 − 10%, 10 − 30 %, 30 − 50%). In both cases, the expected power-law and linear scalings are observed, respectively. The measured p–d correlations can be described by both two- and threebody calculations, indicating that the femtoscopy observable is not sensitive to the short-distance features of the dynamics of the p-(p-n) system, due to the large inter-particle distances in Pb–Pb collisions at the LHC. Indeed, in this study, the minimum measured femtoscopic source sizes for protons and deuterons have a minimum value at 2.73+0.05 −0.05 and 3.10+1.04 −0.86 fm, respectively, for the 30–50% centrality collisions. Moreover, the 𝑚T -scaling obtained for the p–p and p–d systems is compatible within 1𝜎 of the uncertainties. These findings provide new input for fundamental studies on the production of light (anti)nuclei under extreme conditions.2