Production of Λ and K0 S in jets in p–Pb collisions at √sNN = 5.02 TeV and pp collisions at √s = 7 TeV

• Published in: Physics letters. B 2022
• Main Authors: Acharya, Shreyasi, Adamová, Dagmar, Adler, Alexander, Adolfsson, Jonatan, Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Shafiq F, Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Djuvsland, Øystein, Eikeland, Viljar Nilsen, Ersdal, Magnus Rentsch, Fionda, Fiorella Maria Celeste, Grøttvik, Ola Slettevoll, Lofnes, Ingrid Mckibben, Nystrand, Joakim Ingemar, Rehman, Attiq Ur, Röhrich, Dieter, Sætre, Jon-Are, Tambave, Ganesh Jagannath, Ullaland, Kjetil, Wagner, Boris, Yang, Shiming, Yuan, Shiming, Arsene, Ionut Cristian, Dordic, Olja, Malik, Qasim Waheed, Neagu, Alexandra, Richter, Matthias, Røed, Ketil, Skaali, Toralf Bernhard, Tveter, Trine Spedstad, Wikne, Jon Christopher, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Nesbø, Simon Voigt, Reme-Ness, Haakon André, Storetvedt, Maksim Melnik, Langøy, Rune, Lien, Jørgen André, Akbar, Zaenai, Akindinov, Alexander, Al-Turany, Mohammed, Aleksandrov, Dimitry, Alessandro, Bruno, Alfanda, Haidar Mas'ud, ALICE, Collaboration
• Format: Article
• Language: Norwegian
• ISSN: 0370-2693

The production of Λ baryons and K0Smesons (V0particles) was measured in p–Pbcollisions at √sNN=5.02TeV and pp collisions at √s=7TeV with ALICE at the LHC. The production of these strange particles is studied separately for particles associated with hard scatterings and the underlying event to shed light on the baryon-to-meson ratio enhancement observed at intermediate transverse momentum (pT) in high multiplicity pp and p–Pbcollisions. Hard scatterings are selected on an event-by-event basis with jets reconstructed with the anti-kTalgorithm using charged particles. The production of strange particles associated with jets pchT,jet>10and pchT,jet>20GeV/cin p–Pbcollisions, and with jet pchT,jet>10GeV/cin pp collisions is reported as a function of pT. Its dependence on angular distance from the jet axis, R(V0, jet), for jets with pchT,jet>10GeV/cin p–Pbcollisions is reported as well. The pT-differential production spectra of strange particles associated with jets are found to be harder compared to that in the underlying event and both differ from the inclusive measurements. In events containing a jet, the density of the V0particles in the underlying event is found to be larger than the density in the minimum bias events. The Λ/K0Sratio associated with jets in p–Pbcollisions is consistent with the ratio in pp collisions and follows the expectation of jets fragmenting in vacuum. On the other hand, this ratio within jets is consistently lower than the one obtained in the underlying event and it does not show the characteristic enhancement of baryons at intermediate pToften referred to as “baryon anomaly” in the inclusive measurements.