Inclusive cross sections for pairs of identified light charged hadrons and for single protons in e+e- at √s= 10.58 GeV
Belle Collaboration · Seidl, R. · Abdesselam, A. · Adachi, I. · Aihara, H. · Said, S. Al · Asner, D. M. · Aushev, T. · Ayad, R. · Babu, V. · Badhrees, I. · Bakich, A. M. · Barberio, E. · Bhardwaj, V. · Bhuyan, B. · Biswal, J. · Bozek, A. · Bračko, M. · Browder, T. E. · Červenkov, D. · Chekelian, V. · Chen, A. · Cheon, B. G. · Chilikin, K. · Cho, K. · Chobanova, V. · Choi, Y. · Cinabro, D. · Dalseno, J. · Dash, N. · Dingfelder, J. · Doležal, Z. · Drásal, Z. · Dutta, D. · Eidelman, S. · Farhat, H. · Fast, J. E. · Ferber, T. · Fulsom, B. G. · Gaur, V. · Gabyshev, N. · Garmash, A. · Gillard, R. · Giordano, F. · Goh, Y. M. · Goldenzweig, P. · Golob, B. · Haba, J. · Hara, T. · Hayasaka, K. · Hayashii, H. · He, X. H. · Hsu, C. -L. · Iijima, T. · Inami, K. · Ishikawa, A. · Itoh, R. · Iwasaki, Y. · Jacobs, W. W. · Jaegle, I. · Joffe, D. · Joo, K. K. · Kang, K. H. · Kato, E. · Katrenko, P. · Kawasaki, T. · Kim, D. Y. · Kim, H. J. · Kim, J. B. · Kim, J. H. · Kim, K. T. · Kim, M. J. · Kim, S. H. · Kim, Y. J. · Kodyš, P. · Korpar, S. · Križan, P. · Krokovny, P. · Kuzmin, A. · Kwon, Y. -J. · Lange, J. S. · Lee, D. H. · Li, L. · Gioi, L. Li · Libby, J. · Liu, Y. · Liventsev, D. · Lukin, P. · Masuda, M. · Matvienko, D. · Miyabayashi, K. · Miyake, H. · Miyata, H. · Mizuk, R. · Mohanty, S. · Moll, A. · Moon, H. K. · Mori, T. · Mussa, R. · Nakano, E. · Nakao, M. · Nanut, T. · Natkaniec, Z. · Nayak, M. · Niiyama, M. · Nisar, N. K. · Nishida, S. · Ogawa, S. · Okuno, S. · Oswald, C. · Pakhlov, P. · Pakhlova, G. · Pal, B. · Park, C. W. · Park, H. · Pedlar, T. K. · Pestotnik, R. · Petrič, M. · Piilonen, L. E. · Ribežl, E. · Ritter, M. · Rostomyan, A. · Ryu, S. · Sahoo, H. · Sakai, K. · Sakai, Y. · Sandilya, S. · Santelj, L. · Sanuki, T. · Savinov, V. · Schneider, O. · Schnell, G. · Schwanda, C. · Seino, Y. · Senyo, K. · Seon, O. · Sevior, M. E. · Shebalin, V. · Shibata, T. -A. · Shiu, J. -G. · Simon, F. · Sohn, Y. -S. · Sokolov, A. · Solovieva, E. · Starič, M. · Sumihama, M. · Sumisawa, K. · Sumiyoshi, T. · Tamponi, U. · Teramoto, Y. · Trusov, V. · Uchida, M. · Uglov, T. · Unno, Y. · Uno, S. · Usov, Y. · Van Hulse, C. · Vanhoefer, P. · Varner, G. · Vorobyev, V. · Vossen, A. · Wagner, M. N. · Wang, C. H. · Wang, M. -Z. · Wang, P. · Watanabe, M. · Watanabe, Y. · Williams, K. M. · Won, E. · Yamaoka, J. · Yashchenko, S. · Yelton, J. · Yusa, Y. · Zhang, Z. P. · Zhulanov, V.
Original · EN
We report the first double differential cross sections of two charged pions and kaons (e+e- → hhX) in electron-positron annihilation as a function of the fractional energies of the two hadrons for any charge and hadron combination. The dependence of these di-hadron cross sections on the topology (same, opposite-hemisphere or anywhere) is also studied with the help of the event shape variable thrust and its axis. The ratios of these di-hadron cross sections for different charges and hadron combinations directly shed light on the contributing fragmentation functions. For example, we find that the ratio of same-sign pion pairs over opposite-sign pion pairs drops toward higher fractional energies where disfavored fragmentation is expected to be suppressed. These di-hadron results are obtained from a 655 fb⁻¹ data sample collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. Extending the previously published single-pion and single-kaon cross sections, single-proton (e+e- → pX) cross sections are extracted from a 159 fb⁻¹ data sub-sample.
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