Strangeness enhancement in lead-lead collisions

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Presentation transcript:

Strangeness enhancement in lead-lead collisions Analysis of large event samples from lead collisions Find number of Ks, Λ, anti-Λ Calculate particle yields Calculate strangeness enhancement taking into account particle yields in proton collisions

Fit curves to background (2nd degree polynomial) and peak (gaussian) We will now look into how, by analysing large event samples, we calculate the particle yield and eventually strangeness enhancement. Continuum : irreducible background due to random combinations of π+π- or π-p Fit curves to background (2nd degree polynomial) and peak (gaussian) Find number of Ks, Λ, anti-Λ after background subtraction

Geometry of a Pb-Pb collision Peripheral collision Large distance between the centres of the nuclei Small number of participants Few charged particles produced (low multiplicity) Central collision Small distance between the centres of the nuclei Large number of participants Many charged particles produced (high multiplicity)

Centrality of Pb-Pb collisions Distribution of the signal amplitude of V0 (plastic scintillators ) red line : described by model (Glauber) central collisions peripheral collisions

Strangeness enhancement calculation Yield : number of particles produced per interaction = Nparticles(produced)/Nevents Efficiency = Nparticles(measured)/Nparticles(produced)* Yield = Nparticles(measured)/(efficiency x Nevents) Ks-Yield (pp) = 0.25 /interaction ; Λ-Yield(pp) = 0.0617 /interaction ; <Npart> = 2 for pp Strangeness enhancement: the particle yield normalised by the number of participating nucleons in the collision, and divided by the yield in proton-proton collisions** *assumption on efficiency values : to match yields in Analysis Note Measurement of Ks and Λ spectra and yields in Pb–Pb collisions at √sNN=2.76 TeV with the ALICE experiment *pp yields at 2.76 TeV from interpolation between 900 GeV and 7 TeV Analysis Note “Ks, Λ and antiΛ production in pp collisions at 7 TeV”

Strangeness enhancement : one of the first signals of QGP Enhancement increases with number of strange quarks in the hadron (Ω has 3, Ξ has 2, Λ has 1)