Exotic meson $\pi_1(1600)$ with $J^{PC} = 1^{-+}$ and its decay into $\rho(770)\pi$

We study the spin-exotic <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mn>1</mn><mrow><mo>-</mo><mo>+</mo></mro...

Descripción completa

Detalles Bibliográficos
Autores principales: Alexeev, M.G., Alexeev, G.D., Amoroso, A., Andrieux, V., Anosov, V., Augsten, K., Augustyniak, W., Azevedo, C.D.R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Antequera, J. Berenguer, Bernhard, J., Bodlak, M., Bradamante, F., Bressan, A., Burtsev, V.E., Chang, W.-C., Chatterjee, C., Chiosso, M., Chumakov, A.G., Chung, S.-U., Cicuttin, A., Correia, P.M.M., Crespo, M.L., D'Ago, D., Torre, S. Dalla, Dasgupta, S.S., Dasgupta, S., Denisenko, I., Denisov, O.Yu., Donskov, S.V., Doshita, N., Dreisbach, Ch., Duennweber, W., Dusaev, R.R., Efremov, A., Eremeev, D., Eversheim, P.D., Faccioli, P., Faessler, M., Finger, M., Fischer, H., Floethner, K., Franco, C., Friedrich, J.M., Frolov, V., Ordonez, L.G. Garcia, Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Giarra, J., Giordano, D., Gorzellik, M., Grasso, A., Gridin, A., Perdekamp, M. Grosse, Grube, B., Grüner, M., Guskov, A., Haas, F., von Harrach, D., Hoffmann, M., Heitz, R., Horikawa, N., d'Hose, N., Hsieh, C.-Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, T., Jary, V., Joosten, R., Kabuss, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Kisselev, Yu., Klein, F., Koivuniemi, J.H., Kolosov, V.N., Konorov, I., Konstantinov, V.F., Kotzinian, A.M., Kouznetsov, O.M., Koval, A., Kral, Z., Krinner, F., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R.P., Kveton, A., Lavickova, K., Levorato, S., Lian, Y.-S., Lichtenstadt, J., Lin, P.-J., Longo, R., Lyubovitskij, V.E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G.K., Maltsev, A., Mamon, S.A., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, T., Mattson, G., Metzger, F., Meyer, M., Meyer, W., Mikhailov, Yu.V., Mikhasenko, M., Mitrofanov, E., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Novy, J., Nowak, W.-D., Nukazuka, G., Olshevsky, A.G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J.-C., Pesek, M., Peshekhonov, D.V., Peskova, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V.A., Pretz, J., Quaresma, M., Quintans, C., Reicherz, G., Riedl, C., Rudnicki, T., Ryabchikov, D.I., Rymbekova, A., Rychter, A., Samoylenko, V.D., Sandacz, A., Sarkar, S., Savin, I.A., Sbrizzai, G., Schmeing, S., Schmieden, H., Selyunin, A., Sharko, K., Sinha, L., Slunecka, M., Spülbeck, D., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Townsend, A., Tskhay, V., Triloki, T., Uhl, S., Valinoti, B., Vauth, A., Veit, B.M., Veloso, J., Ventura, B., Vidon, A., Virius, M., Wagner, M., Wallner, S., Zaremba, K., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., Zhao, Y., Ziembicki, M.
Lenguaje:eng
Publicado: 2021
Materias:
hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.105.012005
http://cds.cern.ch/record/2779960
Descripción
Sumario:We study the spin-exotic <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mn>1</mn><mrow><mo>-</mo><mo>+</mo></mrow></msup></math> amplitude in single-diffractive dissociation of <math display="inline"><mrow><mn>190</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></mrow></math> pions into <math display="inline"><msup><mi>π</mi><mo>-</mo></msup><msup><mi>π</mi><mo>-</mo></msup><msup><mi>π</mi><mo>+</mo></msup></math> using a hydrogen target and confirm the <math display="inline"><msub><mi>π</mi><mn>1</mn></msub><mo stretchy="false">(</mo><mn>1600</mn><mo stretchy="false">)</mo><mo stretchy="false">→</mo><mi>ρ</mi><mo stretchy="false">(</mo><mn>770</mn><mo stretchy="false">)</mo><mi>π</mi></math> amplitude, which interferes with a nonresonant <math display="inline"><msup><mn>1</mn><mrow><mo>-</mo><mo>+</mo></mrow></msup></math> amplitude. We demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models and different treatment of the dependence of the amplitudes on the squared four-momentum transfer and we thus reconcile these experimental findings. We study the nonresonant contributions to the <math display="inline"><msup><mi>π</mi><mo>-</mo></msup><msup><mi>π</mi><mo>-</mo></msup><msup><mi>π</mi><mo>+</mo></msup></math> final state using pseudodata generated on the basis of a Deck model. Subjecting pseudodata and real data to the same partial-wave analysis, we find good agreement concerning the spectral shape and its dependence on the squared four-momentum transfer for the <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mn>1</mn><mrow><mo>-</mo><mo>+</mo></mrow></msup></math> amplitude and also for amplitudes with other <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup></math> quantum numbers. We investigate for the first time the amplitude of the <math display="inline"><msup><mi>π</mi><mo>-</mo></msup><msup><mi>π</mi><mo>+</mo></msup></math> subsystem with <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mn>1</mn><mrow><mo>-</mo><mo>-</mo></mrow></msup></math> in the <math display="inline"><mn>3</mn><mi>π</mi></math> amplitude with <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mn>1</mn><mrow><mo>-</mo><mo>+</mo></mrow></msup></math> employing the novel freed-isobar analysis scheme. We reveal this <math display="inline"><msup><mi>π</mi><mo>-</mo></msup><msup><mi>π</mi><mo>+</mo></msup></math> amplitude to be dominated by the <math display="inline"><mi>ρ</mi><mo stretchy="false">(</mo><mn>770</mn><mo stretchy="false">)</mo></math> for both the <math display="inline"><msub><mi>π</mi><mn>1</mn></msub><mo stretchy="false">(</mo><mn>1600</mn><mo stretchy="false">)</mo></math> and the nonresonant contribution. These findings largely confirm the underlying assumptions for the isobar model used in all previous partial-wave analyses addressing the <math display="inline"><msup><mi>J</mi><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mn>1</mn><mrow><mo>-</mo><mo>+</mo></mrow></msup></math> amplitude.

Ejemplares similares