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arxiv: 2006.02153 · v2 · pith:AIMAFN3Inew · submitted 2020-06-03 · ⚛️ nucl-ex · hep-ex

Two-particle correlations in azimuthal angle and pseudorapidity in central ⁷Be+⁹Be collisions at the CERN Super Proton Synchrotron

NA61/SHINE Collaboration: A. Aduszkiewicz , E.V. Andronov , T. Anti\'ci\'c , V. Babkin , M. Baszczyk , S. Bhosale , A. Blondel , M. Bogomilov
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A. Brandin A. Bravar W. Bryli\'nski J. Brzychczyk M. Buryakov O. Busygina A. Bzdak H. Cherif M. \'Cirkovi\'c M. Csanad J. Cybowska T. Czopowicz A. Damyanova N. Davis M. Deliyergiyev M. Deveaux A. Dmitriev W. Dominik P. Dorosz J. Dumarchez R. Engel G.A. Feofilov L. Fields Z. Fodor A. Garibov M. Ga\'zdzicki O. Golosov V. Golovatyuk M. Golubeva K. Grebieszkow F. Guber A. Haesler S.N. Igolkin S. Ilieva A. Ivashkin S.R. Johnson K. Kadija N. Kargin E. Kashirin M. Kie{\l}bowicz V.A. Kireyeu V. Klochkov V.I. Kolesnikov D. Kolev A. Korzenev V.N. Kovalenko S. Kowalski M. Koziel A. Krasnoperov W. Kucewicz M. Kuich A. Kurepin D. Larsen A. L\'aszl\'o T.V. Lazareva M. Lewicki K. {\L}ojek V.V. Lyubushkin M. Ma\'ckowiak-Paw{\l}owska Z. Majka B. Maksiak A.I. Malakhov A. Marcinek A.D. Marino K. Marton H.-J. Mathes T. Matulewicz V. Matveev G.L. Melkumov A.O. Merzlaya B. Messerly {\L}. Mik S. Morozov S. Mr\'owczy\'nski Y. Nagai M. Naskr\k{e}t V. Ozvenchuk V. Paolone O. Petukhov R. P{\l}aneta P. Podlaski B.A. Popov B. Porfy M. Posiada{\l}a-Zezula D.S. Prokhorova D. Pszczel S. Pu{\l}awski J. Puzovi\'c M. Ravonel R. Renfordt D. R\"ohrich E. Rondio M. Roth B.T. Rumberger M. Rumyantsev A. Rustamov M. Rybczynski A. Rybicki A. Sadovsky K. Schmidt I. Selyuzhenkov A.Yu. Seryakov P. Seyboth M. S{\l}odkowski P. Staszel G. Stefanek J. Stepaniak M. Strikhanov H. Str\"obele T. \v{S}u\v{s}a A. Taranenko A. Tefelska D. Tefelski V. Tereshchenko A. Toia R. Tsenov L. Turko R. Ulrich M. Unger D. Uzhva F.F. Valiev D. Veberi\v{c} V.V. Vechernin A. Wickremasinghe Z. W{\l}odarczyk K. Wojcik O. Wyszy\'nski E.D. Zimmerman R. Zwaska
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classification ⚛️ nucl-ex hep-ex
keywords deltacollisionscentralcorrelationssimilaranalysisbeamcern
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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 19$A$, 30$A$, 40$A$, 75$A$, and 150$A$ GeV/$c$. 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.

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