1,628 research outputs found
PION PRODUCTION BY PIONS IN THE O-16 (PI+, PI+ PI-) REACTION AT T (PI+) = 280-MEV
No full textThe results of an experiment of pion-induced pion production on 16O at a laboratory energy of 280 MeV are reported. The four-fold-differential cross section, +dΩπ+dEπ+dEπ, was measured, and the missing mass, Mx, for the reaction 16Ofs(π+,π+π−) at laboratory angles of 50°, 80° and 115° for the π−, and from 22° to 128° for the π+ was deduced. The angular and energy distributions of the many-fold differential cross sections are compared with an A(π+,π+π−) model for the reaction. The observed cross sections are reproduced in magnitude and shape when the theoretical calculations consider a proper pion dispersion relation, gw(q), inside the nuclear medium. The total cross section, deduced by integrating the four-fold differential cross sections, is compared with the available theoretical predictions for the 16O(π+, π+π−) reaction
Production cross sections of light and charmed mesons in e+e- annihilation near 10.58 GeV
No full textWe report measurements of production cross sections for +, 0, , *+, *0, , , 0, 0(980), +, 0, +, *+, *0, and *+ in +− collisions at a center-of-mass energy near 10.58 GeV. The data were recorded by the Belle experiment, consisting of 571 fb−1 at 10.58 GeV and 74 fb−1 at 10.52 GeV. Production cross sections are extracted as a function of the fractional hadron momentum . The measurements are compared to pythia Monte Carlo generator predictions with various fragmentation settings, including those that have increased fragmentation into vector mesons over pseudoscalar mesons. The cross sections measured for light hadrons are consistent with no additional increase of vector over pseudoscalar mesons. The charmed-meson cross sections are compared to earlier measurements—when available—including older Belle results, which they supersede. They are in agreement before application of an improved initial-state radiation correction procedure that causes slight changes in their shapes.Authors:
R. Seidl, I. Adachi, H. Aihara, T. Aushev, R. Ayad, Sw. Banerjee, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, D. Biswas, D. Bodrov, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, S. Das, G. De Nardo, G. De Pietro, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Dossett, P. Ecker, T. Ferber, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, Y. Guan, K. Gudkova, C. Hadjivasiliou, T. Hara, H. Hayashii, D. Herrmann, W.-S. Hou, C.-L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, P. Kodyš, A. Korobov, S. Korpar, P. Križan, P. Krokovny, D. Kumar, K. Kumara, Y.-J. Kwon, T. Lam, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mussa, M. Nakao, A. Natochii, M. Niiyama, S. Nishida, S. Ogawa, H. Ono, G. Pakhlova, S. Pardi, J. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, J.-G. Shiu, B. Shwartz, J. B. Singh, E. Solovieva, M. Starič, M. Sumihama, M. Takizawa, K. Tanida, F. Tenchini, T. Uglov, Y. Unno, S. Uno, Y. Usov, C. Van Hulse, A. Vinokurova, A. Vossen, M.-Z. Wang, B. D. Yabsley, W. Yan, Y. Yook, C. Z. Yuan, L. Yuan, Z. P. Zhang, and V. Zhilich (Belle Collaboration
pi+ pi- coincidence measurement in the He-4 (pi+, pi+ pi-) reaction at T (pi+) = 280-MeV
No full textThe pion-induced pion-production reaction (π+, π+π−) on 4He has been studied at an incident pion kinetic energy of 280 MeV. The outgoing pions were detected in coincidence and the measured four-fold differential cross sections are compared with a quasifree πN → ππN microscopic model. Finally, the results are directly compared with recent data from the 16O(π+, π+π−) and2H(π+, π+π−)pp reaction at the same incident energy
MEASUREMENT OF THE O-16 (PI+, PI+ PI-) REACTION AT T (PI+) = 280-MEV
No full textResults from a coincidence measurement of the 16O(π+,π+π-) &=280 MeV are reported, the first of this class. The energy- and angular-integrated cross section was found to be 2950±450 μb and is compared with theoretical predictions. Low-energy positive-pion intensities are found to be much higher than those yielded by a four-body phase-space calculation
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