Resonance production and pi pi S-wave in pi(-) + p -> pi(-) pi(-) pi(+) + p(recoil) at 190 GeV/c

• Published in: Physical review. D 2017, Vol.95 (3)
• Main Authors: Adolph, C., Amoroso, A., Anosov, V., Augustyniak, W., Badelek, B., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Birsa, R., Bisplinghoff, J., Boer, M., Bradamante, F., Bressan, A., Burtin, E., Chiosso, M., Chung, S. -U, Curiel, Q., Dasgupta, S. S., Denisov, O. Yu, Dhara, L., Duennweber, W., Efremov, A., Eversheim, P. D., Eyrich, W., Ferrero, A., Fischer, H., Friedrich, J. M., Frolov, V., Gnesi, I., Grasso, A., Perdekamp, M. Grosse, Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Hinterberger, F., Hsieh, C. -Y, Ishimoto, S., Ivanshin, Yu, Jahn, R., Joosten, R., Joerg, P., Kabuss, E., Ketzer, B., Khokhlov, Yu. A., Kisselev, Yu, Klein, F., Koivuniemi, J. H., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kremser, P., Kunne, F., Kurek, K., Lednev, A. A., Levillain, M., Levorato, S., Longo, R., Makke, N., Mallot, G. K., Martin, A., Meyer, W., Mikhailov, Yu. V., Miyachi, Y., Montuenga, P., Nowak, W. -D, Panzieri, D., Parsamyan, B., Paul, S., Pereira, F., Pochodzalla, J., Polyakov, V. A., Quintans, C., Regali, C., Riedl, C., Ryabchikov, D. I., Rychter, A., Sarkar, S., Sbrizzai, G., Schmidt, K., Schmieden, H., Shevchenko, O. Yu, Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Stolarski, M., Suzuki, H., Szabelski, A., Takekawa, S., Tessaro, S., Tessarotto, F., Uhl, S., Virius, M., Wilfert, M., Zavertyaev, M., Zemlyanichkina, E.
• Format: Article
• Language: English
• ISSN: 2470-0029; 2470-0010
• DOI: 10.1103/PhysRevD.95.032004

The COMPASS collaboration has collected the currently largest data set on diffractively produced pi(-) pi(-) pi(+) final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, 0.5 < m(3 pi) < 2.5 GeV/c(2), and in 11 bins of the reduced four-momentum transfer squared, 0.1 < t' < 1.0 (GeV/c)(2). This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant 3 pi production. In this paper, we present detailed studies on selected 3p partial waves with J(PC) = 0(-+) ,1(++) ,2(-+) ,2(++) ,and 4(++). In these waves, we observe the well-known groundstate mesons as well as a new narrow axial-vector meson a(1)(1420) decaying into f(0) (980)pi. In addition, we present the results of a novel method to extract the amplitude of the pi(-)pi(+) subsystem with I(G)J(PC) = 0(+)0(++) in various partial waves from the pi(-)pi(-)pi(+) data. Evidence is found for correlation of the f (0)(980) and f(0)(1500) appearing as intermediate pi(-)pi(+) isobars in the decay of the known pi(1800) and pi(2)(1880).