Blast-wave fits with resonances to pt spectra from Pb+Pb collisions at √sNN = 2.76 TeV Ivan Meloa,b, Boris Tomášikb,c aŽilinská Univerzita, Žilina, Slovakia.

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Presentation transcript:

Blast-wave fits with resonances to pt spectra from Pb+Pb collisions at √sNN = 2.76 TeV Ivan Meloa,b, Boris Tomášikb,c aŽilinská Univerzita, Žilina, Slovakia bUniverzita Mateja Bela, Banská Bystrica, Slovakia cFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Prague, Czech Republic melo@fyzika.uniza.sk Support: VEGA 1/0457/12, APVV 0050-11 Support: Ministry of Education SR, Agr. 0663/2014 APVV 0050-11 1. Motivation Find temperature and transverse expansion of the freeze-out state of the fireball by fits to pt spectra of various hadron species with resonance decays included Data from ALICE collaboration: π,K,p [1]; K0, Λ [2]; Ξ, Ω [3]; K*, Φ [4] Scenario with two freeze-outs: Tcrit ≥ Tchemical ≥ Tkinetic ≡ T Resonance decays are included with abundances given by Tchemical We implemented blast-wave model with resonances as Monte Carlo → DRAGON 4. Fit results on thermal parameters π, p,K, Λ fits Ξ, Ω fits 2. DRAGON: MC blast-wave model Monte Carlo implementation of the emission function with 277 resonances [5] Included baryonic resonances up to 2 GeV and mesonic resonances up to 1.5 GeV. Strong decays, also cascading decays. Fit summary Fits for all particles limited to bins: 0.9 < Ri = Niexp/NiMC < 1.1 Pions pt > 400 MeV/c Red ellipses estimate 99% C.L. Blue ellipses estimate 68% C.L. Spectra given by Transverse expansion velocity Chemical composition given by Tch= 152 MeV and μB= 1 MeV. In the fits we vary: T,ηf,n. Comparison of ALICE fits to π, K, p with no resonances [1] (2nd column) with DRAGON fits with no resonances (3rd column) and with resonances (4th column). Applied cuts: 0.3 < pt < 3 GeV, 0.5 < pt < 1 GeV, 0.2 < pt < 1.5 GeV for p,π,K respectively. 5. Fits of pt spectra: π+, K+, p, K0, Λ, Ξ Spectra for various centralities are shown along with Ri = Niexp/NiMC ratios. All spectra including those for Ω, K* and Φ can be found in [6]. d2N/dptdy d2N/dptdy d2N/dptdy 0.9 < Ri < 1.1 0.9 < Ri < 1.1 0.9 < Ri < 1.1 3. DRAGON: resonances/direct for π, K, p Pions from resonance decays peak over direct pions at both low pt and high pt for 0 – 5% Spectra anatomy of pions at various centralities: central: low temperature and strong flow: kicks to pions from ρ decays peripheral: higher temperature and more thermal momentum to pions Tkin = 98 MeV, ηf = 0.88, n = 0.69 0 – 5 % d2N/dptdy d2N/dptdy d2N/dptdy 0.9 < Ri < 1.1 0.9 < Ri < 1.1 0.9 < Ri < 1.1 References [1] B. Abelev et al. (ALICE collab.), Phys. Rev. C 88 (2013) 044910 [2] B. Abelev et al. [ALICE collaboration], Phys. Rev. Lett. 111, 222301 (2014) [3] B. Abelev et al. [ALICE collaboration], Phys. Lett. B728, 216 (2014) [4] B. Abelev et al. [ALICE Collaboration], arXiv:1404.0495 [nucl-ex] [5] B. Tomášik, Comp. Phys. Commun. 180 (2009) 1652 [6] I. Melo, B. Tomasik, arXiv:1502.01247v1 [nucl-th] Conclusion: Resonances induce downward shifts ≤ 10 MeV in Tkin for central collisions and upward shifts ≤ 25 MeV for peripheral collisions Multistrange baryons show freeze-out at higher temperature and weaker transverse flow. Chemical potentials inclusion currently under way (to lift assumption that resonances with abundances fixed at Tch decay only after kinetic freeze-out)