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arXiv · 1706.08348

Invariant-mass and fractional-energy dependence of inclusive production of di-hadrons in $e^+e^-$ annihilation at $\sqrt{s}=$ 10.58 GeV

Belle Collaboration·R. Seidl·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·T. Aushev·I. Badhrees·A. M. Bakich·V. Bansal·P. Behera·V. Bhardwaj·B. Bhuyan·J. Biswal·A. Bobrov·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·D. Cinabro·N. Dash·S. Di Carlo·Z. Doležal·Z. Drásal·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·R. Gillard·P. Goldenzweig·E. Guido·J. Haba·K. Hayasaka·H. Hayashii·W. -S. Hou·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·I. Jaegle·H. B. Jeon·S. Jia·Y. Jin·D. Joffe·K. K. Joo·T. Julius·K. H. Kang·G. Karyan·D. Y. Kim·J. B. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·P. Kodyš·S. Korpar·D. Kotchetkov·P. Križan·P. Krokovny·R. Kulasiri·T. Kumita·A. Kuzmin·Y. -J. Kwon·J. S. Lange·L. Li·L. Li Gioi·J. Libby·D. Liventsev·M. Lubej·T. Luo·M. Masuda·T. Matsuda·D. Matvienko·M. Merola·K. Miyabayashi·H. Miyata·R. Mizuk·H. K. Moon·T. Mori·R. Mussa·E. Nakano·M. Nakao·T. Nanut·K. J. Nath·Z. Natkaniec·M. Niiyama
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Abstract

The inclusive cross sections for di-hadrons of charged pions and kaons ($e^+e^- \rightarrow hhX$) in electron-positron annihilation are reported. They are obtained as a function of the total fractional energy and invariant mass for any di-hadron combination in the same hemisphere as defined by the thrust event-shape variable and its axis. Since same-hemisphere di-hadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. These di-hadron fragmentation functions are needed as an unpolarized baseline in order to quantitatively understand related spin-dependent measurements in other processes and to apply them to the extraction of quark transversity distribution functions in the nucleon. The di-hadron cross sections are obtained from a $655\,{\rm fb}^{-1}$ data sample collected at or near the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.

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Belle Collaboration, R. Seidl, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, I. Badhrees, A. M. Bakich, V. Bansal, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, D. Cinabro, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, R. Gillard, P. Goldenzweig, E. Guido, J. Haba, K. Hayasaka, H. Hayashii, W. -S. Hou, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, G. Karyan, D. Y. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, P. Krokovny, R. Kulasiri, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. S. Lange, L. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, H. K. Moon, T. Mori, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Niiyama. 2017-06-26. Invariant-mass and fractional-energy dependence of inclusive production of di-hadrons in $e^+e^-$ annihilation at $\sqrt{s}=$ 10.58 GeV. https://doi.org/10.1103/physrevd.96.032005

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