Invariant-mass and fractional-energy dependence of inclusive production of dihadrons in e+e- annihilation at s=10.58GeV

• Published in: Physical review. D 2017-08, Vol.96 (3)
• Main Authors: Seidl, R., Adachi, I., Al Said, S., Asner, D. M., Bakich, A. M., Bansal, V., Bhardwaj, V., Biswal, J., Bobrov, A., Bozek, A., Bračko, M., Browder, T. E., Červenkov, D., Chekelian, V., Chen, A., Dash, N., Di Carlo, S., Doležal, Z., Drásal, Z., Eidelman, S., Farhat, H., Fast, J. E., Ferber, T., Fulsom, B. G., Gaur, V., Guido, E., Haba, J., Hayasaka, K., Hou, W. -S., Iijima, T., Ishikawa, A., Itoh, R., Iwasaki, Y., Jacobs, W. W., Jeon, H. B., Jin, Y., Joo, K. K., Julius, T., Kang, K. H., Karyan, G., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, Y. J., Korpar, S., Kotchetkov, D., Križan, P., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Li, L., Libby, J., Liventsev, D., Lubej, M., Masuda, M., Matvienko, D., Mori, T., Mussa, R., Nakano, E., Nakao, M., Nath, K. J., Natkaniec, Z., Niiyama, M., Nishida, S., Pal, B., Park, H., Paul, S., Piilonen, L. E., Ritter, M., Rostomyan, A., Sakai, Y., Santelj, L., Savinov, V., Schneider, O., Schnell, G., Seino, Y., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Sokolov, A., Starič, M., Sumisawa, K., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Unno, Y., Vorobyev, V., Wang, C. H., Wang, P., Watanabe, Y., Watanuki, S., Won, E., Yamashita, Y., Ye, H., Zhang, Z. P., Zupanc, A.
• Format: Article
• Language: English
• Subjects: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 2470-0010; 2470-0029

The inclusive cross sections for dihadrons of charged pions and kaons ( e+e- → hhX ) in electron-positron annihilation are observed and reported on. 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 dihadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. Moreove, 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 655fb-1 data sample collected at or near the Υ ( 4S ) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.