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Aduszkiewicz, A.; Andronov, E.V.; Antićić, T.; Babkin, V.; Baszczyk, M.; Bhosale, S.; Blondel, A.; Bogomilov, M.; Brandin, A.; Bravar, A.; Bryliński, W.; Brzychczyk, J.; Buryakov, M.; Busygina, O.; Bzdak, A.; Cherif, H.; Ćirković, M.; Csanad, M.; Cybowska, J.; Czopowicz, T.; Damyanova, A.; Davis, N.; Deliyergiyev, M.; Deveaux, M.; Dmitriev, A.; Dominik, W.; Dorosz, P.; Dumarchez, J.; Engel, R.; Feofilov, G.A.; Fields, L.; Fodor, Z.; Garibov, A.; Gaździcki, M.; Golosov, O.; Golovatyuk, V.; Golubeva, M.; Grebieszkow, K.; Guber, F.; Haesler, A.; Igolkin, S.N.; Ilieva, S.; Ivashkin, A.; Johnson, S.R.; Kadija, K.; Kargin, N.; Kashirin, E.; Kiełbowicz, M.; Kireyeu, V.A.; Klochkov, V.; Kolesnikov, V.I.; Kolev, D.; Korzenev, A.; Kovalenko, V.N.; Kowalski, S.; Koziel, M.; Krasnoperov, A.; Kucewicz, W.; Kuich, M.; Kurepin, A.; Larsen, D.; László, A.; Lazareva, T.V.; Lewicki, M.; Łojek, K.; Lyubushkin, V.V.; Maćkowiak-Pawłowska, M.; Majka, Z.; Maksiak, B.; Malakhov, A.I.; Marcinek, A.; Marino, A.D.; Marton, K.; Mathes, H.J.; Matulewicz, T.; Matveev, V.; Melkumov, G.L.; Merzlaya, A.O.; Messerly, B.; Mik, Ł.; Morozov, S.; Mrówczyński, S.; Nagai, Y.; Naskręt, M.; Ozvenchuk, V.; Paolone, V.; Petukhov, O.; Płaneta, R.; Podlaski, P.; Popov, B.A.; Porfy, B.; Posiadała-Zezula, M.; Prokhorova, D.S.; Pszczel, D.; Puławski, S.; Puzović, J.; Ravonel, M.; Renfordt, R.; Röhrich, D.; Rondio, E.
The European physical journal. C, Particles and fields, 2020, Letnik: 80, Številka: 12Journal Article
A measurement of charged hadron pair correlations in two-dimensional $\Delta \eta \Delta \phi $ space is presented. The analysis is based on total 30 million central Be + Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19A, 30A, 40A, 75A, and 150A $\text {Ge} \text {V}/c$. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The $C(\Delta \eta ,\Delta \phi )$ correlation functions were compared with results from a similar analysis on p + p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be + Be collisions and p + p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the Epos and UrQMD models are compared to the measurements. Evolution of an enhancement around $(\Delta \eta ,\Delta \phi ) = (0,0)$ with incident energy is observed in central Be + Be collisions. It is not predicted by both models and almost non-existing in proton–proton collisions at the same momentum per nucleon.
