2. Analysis detailsThe results presented in this paper are based on the data sets acquired at the LHC using the ALICEdetector [6] during the Pb–Pb runs at√sNN=2.76 TeV in 2010 and at√sNN=5.02 TeV in 2015, the p–Pbruns at√sNN=5.02 TeV in 2013 and 2016, and the pp runs at√s=7 TeV in 2010. The acquisition ofevents is triggered with a minimum bias trigger using the V0 detector, which requires a coincidence of hitsin both V0A and V0C detectors in Pb–Pb and p–Pb collisions, while in pp collisions it requires at least onehit in the Silicon Pixel Detector (SPD) or in one of V0A and V0C. Background events, such as generatedby beam–gas interactions, are eliminated to a negligible level (<0.1%) by comparing the signal arrival timebetween V0A and V0C with 1 ns resolution. In total, with all the selection criteria applied, about 14×106,82×106, 100×106, 620×106and 240×106events are analyzed for Pb–Pb at 2.76 TeV and 5.02 TeV, p–Pbin 2013 and 2016, and pp collisions, respectively. The particle identification is achieved by using combinedinformation from the Time Projection Chamber (TPC) and the Time-Of-Flight (TOF) detector, with purityof both charged kaons (K±) and charged pions (π±) better than 96%. For unidentified hadrons (h±), thepseudorapidity selection is|η|≤0.8, while for K±andπ±, the rapidity selection is|y|≤0.8. Detectionefficiency and acceptance are fully corrected using a weight technique [7].3. ResultsyΔ1−0.5−00.51y)ΔB(00.10.20.3 0-10% 30-40% 50-90% = 2.76 TeVNNsPb-Pb ALICE Preliminaryc 2 GeV/≤Tp≤0.2 π≤| φΔ|±KALI−PREL−159000yΔ1−01y)ΔB(00.20.40.6 0-5% 30-40% 70-90% = 2.76 TeVNNsPb-Pb ALICE Preliminaryc 2 GeV/≤Tp≤0.2 π≤| φΔ|±πALI−PREL−158908Centrality (%)0 20406080yΔσ0.40.60.81ALICE Preliminary = 2.76 TeVNNsPb-Pb c 2 GeV/≤Tp≤0.2 π≤| φΔ 1.6, |≤y| Δ: |±ππ≤| φΔ 1.1, |≤y| Δ: |±KALI−PREL−159008Fig. 1. The BF as a function ofΔyfor K±(left) andπ±(middle) in selected centralities, and their RMS widths as a function of centrality(right) in Pb–Pb collisions at√sNN=2.76 TeV. (rad)φΔ024)-1) (radφΔB(00.050.10.15 0-10% 30-40% 50-90% = 2.76 TeVNNsPb-Pb ALICE Preliminaryc 2 GeV/≤Tp≤0.2 1.1≤y| Δ|±KALI−PREL−159004 (rad)φΔ024)-1) (radφΔB(00.10.20.30.4 0-5% 30-40% 70-90% = 2.76 TeVNNsPb-Pb ALICE Preliminaryc 2 GeV/≤Tp≤0.2 1.6≤y| Δ|±πALI−PREL−158912Centrality (%)0 20406080 (rad)φΔσ0.511.52ALICE Preliminary = 2.76 TeVNNsPb-Pb c 2 GeV/≤Tp≤0.2 π≤| φΔ 1.6, |≤y| Δ: |±ππ≤| φΔ 1.1, |≤y| Δ: |±KALI−PREL−159012Fig. 2. The BF as a function ofΔφfor K±(left) andπ±(middle) in selected centralities, and their RMS widths as a function of centrality(right) in Pb–Pb collisions at√sNN=2.76 TeV.In this paper, only one-dimensional projections of B(Δy,Δφ) ontoΔyandΔφaxis along with their RMSwidths are presented. Figures 1 and 2 present B(Δy) and B(Δφ) for K±andπ±in selected centralities, andJ. Pan / Nuclear Physics A 982 (2019) 315–318316