Measurements of $$\pi ^\pm $$, $$K^\pm $$, p and $$\bar{p}$$ spectra in $$^7$$Be+$$^9$$Be collisions at beam momenta from 19A to 150A $${\mathrm{Ge} \mathrm{V}}\!/\!c$$ with the NA61/SHINE spectrometer at the CERN SPS
A. Acharya, H. Adhikary, A. Aduszkiewicz, K. K. Allison, Evgeny Andronov, T. Antičić, V. Babkin, M. Baszczyk, S. Bhosale, A. Blondel, M. Bogomilov, A. V. Brandin, A. Bravar, W. Bryliński, J. Brzychczyk, M. Buryakov, O. Busygina, Adam Bzdak, H. Cherif, M. Ćirković, M. Csanád, J. Cybowska, T. Czopowicz, A. Damyanova, N. Davis, M. Deliyergiyev, M. Deveaux, A. Dmitriev, W. Dominik, P. Dorosz, J. Dumarchez, R. Engel, Г. Феофилов, L. Fields, Z. Fodor, А. А. Гарибов, M. Gaździcki, O. Golosov, V.M. Golovatyuk, M. Golubeva, K. Grebieszkow, F. Guber, A. Haesler, S. N. Igolkin, S. Ilieva, A. Ivashkin, S. R. Johnson, K. Kadija, Н. И. Каргин, E. Kashirin, M. Kiełbowicz, V. A. Kireyeu, V. P. Klochkov, V. I. Kolesnikov, D. Kolev, A. Korzenev, V. Kovalenko, S. Kowalski, M. Kozieł, B. Kozłowski, A. Krasnoperov, W. Kucewicz, M. Kuich, A. Kurepin, D. Larsen, Á. László, T. V. Lazareva, M. P. Lewicki, K. Łojek, V. Lyubushkin, M. Maćkowiak-Pawłowska, Z. Majka, B. Maksiak, A. Malakhov, A. Marcinek, A. D. Marino, K. Márton, H.-J. Mathes, T. Matulewicz, V. A. Matveev, G. L. Melkumov, A. Merzlaya, B. Messerly, Ł. Mik, S. Morozov, Stanisław Mrówczyński, Y. Nagai, M. Naskręt, V. Ozvenchuk, V. Paolone, O. Petukhov, R. Płaneta, P. Podlaski, B. Popov, B. Pórfy, M. Posiadała-Zezula, Д. С. Прохорова, D. Pszczel, S. Puławski, J. Puzović
Abstract
Abstract The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies the onset of deconfinement in hadron matter by a scan of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> , $$K^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> , p and $$\bar{p}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mi>p</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:math> produced in the 20% most central $$^7$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mn>7</mml:mn> </mml:msup> </mml:math> Be+ $$^9$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mn>9</mml:mn> </mml:msup> </mml:math> Be collisions at beam momenta of 19 A , 30 A , 40 A , 75 A and 150 A $${\mathrm{Ge} \mathrm{V}}\!/\!c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mi>Ge</mml:mi> <mml:mi>V</mml:mi> </mml:mrow> <mml:mspace/> <mml:mo>/</mml:mo> <mml:mspace/> <mml:mi>c</mml:mi> </mml:mrow> </mml:math> . The energy dependence of the $$K^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> / $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> ratios as well as of inverse slope parameters of the $$K^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> transverse mass distributions are close to those found in inelastic p+p reactions. The new results are compared to the world data on p+p and Pb+Pb collisions as well as to predictions of the Epos , U r qmd , Ampt , Phsd and Smash models.