Search for a common baryon source in high-multiplicity pp collisions at the LHC

Formation of light (anti)nuclei

“…In the coalescence picture, deuteron, helium-3 and tritium are expected to be created by nucleons with the same spread, and the parameter σ should thus be the same for all three particles. In the previous subsection, we saw that the spread is already well determined by antideuteron experiments, which has been confirmed independently by the measurements on the baryon emission volume by the ALICE collaboration [7,29]. Thus, we can allow ourselves to degrade r 3 He rms to a free parameter to better describe the effective ground state of the nucleus.…”

“…3, where the best fit to the invariant differential yield of antideuterons measured by the ALICE collaboration [28] is plotted using Pythia 8 and QGSJET II. Furthermore, it describes the behaviour of the nontrivial baryon emission volume as measured by the ALICE collaboration [7,29]. This is particularly important as it provides a method of determining the parameter σ independent of an event generator (orange triangle in Fig.…”

“…The WiFunC model without any Lorentz boost gives a similar fit as the standard coalescence model and is shown for comparison (green dashed line). baryon emission volume with increasing transverse momentum [29], is also naturally described by the WiFunC model [7]. Moreover, the hints are irrelevant for astrophysical processes since they are at present only observed at high energies and multiplicities.…”

On nuclear coalescence in small interacting systems

“…In this work, we argue that neither two-particle correlations nor the source size can be neglected when describing the cluster formation in small interacting systems 2 . Furthermore, we will use this model to describe the production of hadrons and nuclei in high energy pp collisions and compare it to recent experimental data by the ALICE collaboration on the size of the baryon emitting source [48] and on the multiplicity and transverse momentum dependence of the coalescence factor B 2 [45,49,50]. Both data sets have been interpreted as evidence of collective flows, but we will show that the same characteristics are described using QCD inspired event generators, like QGSJET II [51,52] and Pythia 8.2 [53,54].…”

A technique to study the elastic and inelastic interaction of quarkonium with hadrons using femtoscopic correlations

“…If not, then the uncertainty on the assumed value of r 0 would be a source of systematic uncertainty. The values of r 0 are known with good precision for different pairs and collision systems [48,50], therefore we expect such uncertainty to be small. Besides, the assumption of the Gaussian shape of the r * distribution could be a source of systematic uncertainty since other models are considered in the literature.…”