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arXiv · 1509.00563

Inclusive cross sections for pairs of identified light charged hadrons and for single protons in $e^+e^-$ at $\sqrt{s}=$ 10.58 GeV

Belle Collaboration·R. Seidl·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·T. Aushev·R. Ayad·V. Babu·I. Badhrees·A. M. Bakich·E. Barberio·V. Bhardwaj·B. Bhuyan·J. Biswal·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·V. Chobanova·Y. Choi·D. Cinabro·J. Dalseno·N. Dash·J. Dingfelder·Z. Doležal·Z. Drásal·D. Dutta·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·R. Gillard·F. Giordano·Y. M. Goh·P. Goldenzweig·B. Golob·J. Haba·T. Hara·K. Hayasaka·H. Hayashii·X. H. He·C. -L. Hsu·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·I. Jaegle·D. Joffe·K. K. Joo·K. H. Kang·E. Kato·P. Katrenko·T. Kawasaki·D. Y. Kim·H. J. Kim·J. B. Kim·J. H. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·A. Kuzmin·Y. -J. Kwon·J. S. Lange·D. H. Lee·L. Li·L. Li Gioi·J. Libby·Y. Liu·D. Liventsev·P. Lukin·M. Masuda·D. Matvienko·K. Miyabayashi·H. Miyake·H. Miyata·R. Mizuk·S. Mohanty·A. Moll·H. K. Moon·T. Mori·R. Mussa·E. Nakano
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Abstract

We report the first double differential cross sections of two charged pions and kaons ($e^+e^- \rightarrow hhX$) 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 $655\,{\rm fb}^{-1}$ 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 ($e^+e^- \rightarrow pX$) cross sections are extracted from a $159\,{\rm fb}^{-1}$ data sub-sample.

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Belle Collaboration, R. Seidl, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, E. Barberio, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, N. Dash, J. Dingfelder, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, R. Gillard, F. Giordano, Y. M. Goh, P. Goldenzweig, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, X. H. He, C. -L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, D. Joffe, K. K. Joo, K. H. Kang, E. Kato, P. Katrenko, T. Kawasaki, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y. -J. Kwon, J. S. Lange, D. H. Lee, L. Li, L. Li Gioi, J. Libby, Y. Liu, D. Liventsev, P. Lukin, M. Masuda, D. Matvienko, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, S. Mohanty, A. Moll, H. K. Moon, T. Mori, R. Mussa, E. Nakano. 2015-10-25. Inclusive cross sections for pairs of identified light charged hadrons and for single protons in $e^+e^-$ at $\sqrt{s}=$ 10.58 GeV. https://arxiv.org/abs/1509.00563

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