Measurement of negatively charged pion spectra in inelastic p plus p interactions at p(lab)=20, 31, 40, 80 and 158 GeV/c

Abgrall, N. and Aduszkiewicz, A. and Ali, Y. and Anticic, T. and Antoniou, N. and Baatar, B. and Bay, F. and Blondel, A. and Blumer, J. and Bogomilov, M. and Bravar, A. and Brzychczyk, J. and Bunyatov, S. A. and Busygina, O. and Christakoglou, P. and Czopowicz, T. and Davis, N. and Debieux, S. and Dembinski, H. and Diakonos, F. and Di Luise, S. and Dominik, W. and Drozhzhova, T. and Dumarchez, J. and Dynowski, K. and Engel, R. and Ereditato, A. and Feofilov, G. A. and Fodor, Zoltán and Fülöp, Ágnes and Kiss, Tivadar and László, András and Márton, Krisztina and Pálla, Gabriella and Sipos, Roland and Tölyhi, Tamás and Vesztergombi, György (2014) Measurement of negatively charged pion spectra in inelastic p plus p interactions at p(lab)=20, 31, 40, 80 and 158 GeV/c. EUROPEAN PHYSICAL JOURNAL C, 74 (3). ISSN 1434-6044

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Abstract

We present experimental results on inclusive spectra and mean multiplicities of negatively charged pions produced in inelastic p+p interactions at incident projectile momenta of 20, 31, 40, 80 and 158 GeV/c (√s = 6.3, 7.7, 8.8, 12.3 and 17.3 GeV, respectively). The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchro- tron. Two-dimensional spectra are determined in terms of ra- pidity and transverse momentum. Their properties such as the width of rapidity distributions and the inverse slope pa- rameter of transverse mass spectra are extracted and their collision energy dependences are presented. The results on inelastic p+p interactions are compared with the correspond- ing data on central Pb+Pb collisions measured by the NA49 experiment at the CERN SPS. The results presented in this paper are part of the NA61/ SHINE ion program devoted to the study of the properties of the onset of deconfinement and search for the critical point of strongly interacting matter. They are required for inter- pretation of results on nucleus-nucleus and proton-nucleus collisions.

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