XXXII Щорічна конференція ІЯД НАН України - 2025

V0 Production in Proton-Proton Collisions at 7.0 TeV in the LHCb Experiment

27 трав. 2025 р., 14:30

20 хв

Секційна доповідь Експериментальна ядерна фізика Експериментальна ядерна фізика

Доповідач

Oleksandr Kot (INR NAS of Ukraine)

Опис

This research investigates the production of $V^0$ hadrons (Λ, K⁰) in high-energy particle collisions using the LHCb detector. By analyzing their characteristic "V-shaped" decay signatures across proton-proton, proton-nucleus, and nucleus-nucleus collision systems, we gain crucial insights into quantum chromodynamics under extreme conditions. Our measurements of differential cross-sections and nuclear modification factors help disentangle cold nuclear matter effects from potential quark-gluon plasma signatures, advancing our understanding of hadronization processes and partial chiral symmetry restoration in dense nuclear environments.
Only V⁰ decays occurring within the Vertex Locator (VELO), with both daughter tracks fully reconstructed in the forward spectrometer and having momenta p > 2 GeV/c, are considered. Oppositely charged track pairs are retained as potential $V^0$ candidates if they form a vertex with a fit quality ${\chi }_{vtx}^2$ < 9 (with one degree of freedom for a $V^0$ vertex). Λ candidates are required to have invariant masses within ±70 MeV/c², and $K_S^0$ candidates within ±100 MeV/c² of their respective PDG values. The differential production cross-sections of V⁰ hadrons are measured using the LHCb forward spectrometer in proton–proton (p–p) collisions at √s = 7 TeV, covering a transverse momentum range of 0.15 < pₜ < 10.0 GeV/c and a rapidity range of 1.5 < y⁎ < 5.5.
The current work is completed as part of the analysis aimed at measuring Nuclear Modification Factors of $V^0$ produced in proton-lead collisions at 8.16 TeV. The Fig 1 presents V0 single differential cross-sections.