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A. Aduszkiewicz; E. V. Andronov; T. Antićić; V. Babkin; S. Bhosale; A. Brandin; A. Bravar; W. Bryliński; J. Brzychczyk; M. Buryakov; O. Busygina; A. Bzdak; H. Cherif; M. Csanad; J. Cybowska; T. Czopowicz; A. Damyanova; M. Deveaux; A. Dmitriev; W. Dominik; J. Dumarchez; R. Engel; L. Fields; Z. Fodor; A. Garibov; O. Golosov; V. Golovatyuk; M. Golubeva; K. Grebieszkow; F. Guber; A. Haesler; S. N. Igolkin; S. Ilieva; A. Ivashkin; K. Kadija; N. Kargin; E. Kashirin; M. Kiełbowicz; V. A. Kireyeu; D. Kolev; A. Korzenev; V. N. Kovalenko; A. Krasnoperov; M. Kuich; A. Kurepin; T. V. Lazareva; M. Lewicki; K. Łojek; V. V. Lyubushkin; M. Maćkowiak-Pawłowska; B. Maksiak; A. I. Malakhov; A. D. Marino; K. Marton; H.-J. Mathes; T. Matulewicz; V. Matveev; G. L. Melkumov; A. O. Merzlaya; Ł. Mik; Y. Nagai; M. Naskręt; V. Ozvenchuk; V. Paolone; O. Petukhov; R. Płaneta; M. Posiadała-Zezula; D. Pszczel; S. Puławski; M. Ravonel; R. Renfordt; E. Rondio; M. Roth; B. T. Rumberger; M. Rumyantsev; A. Rustamov; A. Rybicki; A. Sadovsky; K. Schmidt; I. Selyuzhenkov; A. Yu. Seryakov; P. Seyboth; M. Słodkowski; G. Stefanek; J. Stepaniak; M. Strikhanov; H. Ströbele; A. Taranenko; A. Tefelska; D. Tefelski; V. Tereshchenko; R. Tsenov; L. Turko; R. Ulrich; D. Uzhva; F. F. Valiev; A. Wickremasinghe; Z. Włodarczyk; K. Wojcik; R. Zwaska
The European physical journal. C, Particles and fields, 12/2020, Letnik: 80, Številka: 12Journal Article
Abstract A measurement of charged hadron pair correlations in two-dimensional $$\Delta \eta \Delta \phi $$ Δ η Δ ϕ 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 $$\text {Ge} \text {V}/c$$ Ge / c . Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The $$C(\Delta \eta ,\Delta \phi )$$ C ( Δ η , Δ ϕ ) 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 $$(\Delta \eta ,\Delta \phi ) = (0,0)$$ ( Δ η , Δ ϕ ) = ( 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.
