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Baatar, B. Maksiak, C. Pistillo, D. Jokovi\\'c, D. Kie{\\l}czewska, D. Kolev, D. Larsen, D. Mani\\'c, D. R\\\"ohrich, D. Sgalaberna, D. Veberi\\v{c}, E. Kaptur, E. Rondio, E. Skrzypczak, F. Bay, F. Diakonos, F. Guber, G. A. Feofilov, G. L. Melkumov, G. Palla, G. Stefanek, G. Vesztergombi, H. Dembinski, H.-J. Mathes, H. Str\\\"obele, J. Blumer, J. Brzychczyk, J. Dumarchez, J. Kisiel, J. Pluta, J. Puzovi\\'c, J. Stepaniak, K. Dynowski, K. Grebieszkow, K. Kadija, K. Marton, K. Nishikawa, K. Sakashita, K. Schmidt, L. Turko, L. Vinogradov, L. Zambelli, M. Bogomilov, M. Ga\\'zdzicki, M. Golubeva, M. Hierholzer, M. Kirejczyk, M. Ma\\'ckowiak-Paw{\\l}owska, M. Nirkko, M. Posiada{\\l}a, M. Ravonel, M. Roth, M. Rybczynski, M. Savi\\'c, M. Shibata, M. S{\\l}odkowski, M. Szuba, M. Tada, M. Unger, M. Vassiliou, NA61/SHINE Collaboration: N. Abgrall, N. Antoniou, N. Davis, O. Busygina, O. Petukhov, O. Wyszy\\'nski, P. Christakoglou, P. Kovesarki, P. Seyboth, P. Staszel, R. Engel, R. Idczak, R. P{\\l}aneta, R. Renfordt, R. Sipos, R. Tsenov, R. Ulrich, S. A. Bunyatov, S. Debieux, S. Di Luise, S. Igolkin, S. Kleinfelder, S. Kowalski, S. Murphy, S. Pu{\\l}awski, St. Mr\\'owczy\\'nski, T. Anticic, T. Czopowicz, T. Drozhzhova, T. Hasegawa, T. Kiss, T. Kobayashi, T. Matulewicz, T. Nakadaira, T. Palczewski, T. Paul, T. Sekiguchi, T. Tolyhi, T. \\v{S}u\\v{s}a, V. I. Kolesnikov, V. Marin, V. Matveev, V. P. Kondratiev, V. Tereshchenko, V. V. Lyubushkin, V. V. Vechernin, W. Dominik, W. Peryt, W. Rauch, W. Zipper, Y. Ali, Z. Fodor, Z. Majka, Z. W{\\l}odarczyk","submitted_at":"2013-10-09T09:54:46Z","abstract_excerpt":"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 ($\\sqrt{s} = $ 6.3, 7.7, 8.8, 12.3 and 17.3 GeV, respectively). 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