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Adolph C, Akhunzyanov R, Alexeev MG, et al. Observation of a New Narrow Axial-Vector Meson a1(1420). Phys Rev Lett. 2015;115(8):082001doi: 10.1103/PhysRevLett.115.082001.
Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Azevedo, C., Badełek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Büchele, M., Burtin, E., Chang, W. C., Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y., Dhara, L., Donskov, S. V., Doshita, N., Dünnweber, W., Duic, V., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse-Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Horikawa, N., d'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y., Iwata, T., Jahn, R., Jary, V., Jörg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pesek, M., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schmeing, S., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schlüter, T., Selyunin, A., Shevchenko, O. Y., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A. (2015). Observation of a New Narrow Axial-Vector Meson a1(1420). Physical review letters, 115(8), 082001. https://doi.org/10.1103/PhysRevLett.115.082001
Adolph, C, et al. "Observation of a New Narrow Axial-Vector Meson a1(1420)." Physical review letters vol. 115,8 (2015): 082001. doi: https://doi.org/10.1103/PhysRevLett.115.082001
Adolph C, Akhunzyanov R, Alexeev MG, Alexeev GD, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Azevedo C, Badełek B, Balestra F, Barth J, Beck R, Bedfer Y, Bernhard J, Bicker K, Bielert ER, Birsa R, Bisplinghoff J, Bodlak M, Boer M, Bordalo P, Bradamante F, Braun C, Bressan A, Büchele M, Burtin E, Chang WC, Chiosso M, Choi I, Chung SU, Cicuttin A, Crespo ML, Curiel Q, Dalla Torre S, Dasgupta SS, Dasgupta S, Denisov OY, Dhara L, Donskov SV, Doshita N, Dünnweber W, Duic V, Dziewiecki M, Efremov A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M, Fischer H, Franco C, du Fresne von Hohenesche N, Friedrich JM, Frolov V, Gautheron F, Gavrichtchouk OP, Gerassimov S, Gnesi I, Gorzellik M, Grabmüller S, Grasso A, Grosse-Perdekamp M, Grube B, Grussenmeyer T, Guskov A, Haas F, Hahne D, von Harrach D, Hashimoto R, Heinsius FH, Herrmann F, Hinterberger F, Horikawa N, d'Hose N, Hsieh CY, Huber S, Ishimoto S, Ivanov A, Ivanshin Y, Iwata T, Jahn R, Jary V, Jörg P, Joosten R, Kabuß E, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koivuniemi JH, Kolosov VN, Kondo K, Königsmann K, Konorov I, Konstantinov VF, Kotzinian AM, Kouznetsov O, Krämer M, Kremser P, Krinner F, Kroumchtein ZV, Kuchinski N, Kunne F, Kurek K, Kurjata RP, Lednev AA, Lehmann A, Levillain M, Levorato S, Lichtenstadt J, Maggiora A, Magnon A, Makins N, Makke N, Mallot GK, Marchand C, Martin A, Marzec J, Matousek J, Matsuda H, Matsuda T, Meshcheryakov G, Meyer W, Michigami T, Mikhailov YV, Miyachi Y, Nagaytsev A, Nagel T, Nerling F, Neyret D, Nikolaenko VI, Novy J, Nowak WD, Nunes AS, Olshevsky AG, Orlov I, Ostrick M, Panzieri D, Parsamyan B, Paul S, Peng JC, Pereira F, Pesek M, Peshekhonov DV, Platchkov S, Pochodzalla J, Polyakov VA, Pretz J, Quaresma M, Quintans C, Ramos S, Regali C, Reicherz G, Riedl C, Rocco E, Rossiyskaya NS, Ryabchikov DI, Rychter A, Samoylenko VD, Sandacz A, Santos C, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schmeing S, Schmidt K, Schmieden H, Schönning K, Schopferer S, Schlüter T, Selyunin A, Shevchenko OY, Silva L, Sinha L, Sirtl S, Slunecka M, Sozzi F, Srnka A, Stolarski M, Sulc M, Suzuki H, Szabelski A, Szameitat T, Sznajder P, Takekawa S, Ter Wolbeek J, Tessaro S, Tessarotto F, Thibaud F, Tskhay V, Uhl S, Veloso J, Virius M, Wallner S, Weisrock T, Wilfert M, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zink A. Observation of a New Narrow Axial-Vector Meson a1(1420). Phys Rev Lett. 2015 Aug 21;115(8):082001. doi: 10.1103/PhysRevLett.115.082001. Epub 2015 Aug 19. PMID: 26340182.
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Phys Rev Lett. 2015 Aug 21;115(8):082001. doi: 10.1103/PhysRevLett.115.082001. Epub 2015 Aug 19.

Observation of a New Narrow Axial-Vector Meson a1(1420).

Physical review letters

C Adolph, R Akhunzyanov, M G Alexeev, G D Alexeev, A Amoroso, V Andrieux, V Anosov, A Austregesilo, C Azevedo, B Badełek, F Balestra, J Barth, R Beck, Y Bedfer, J Bernhard, K Bicker, E R Bielert, R Birsa, J Bisplinghoff, M Bodlak, M Boer, P Bordalo, F Bradamante, C Braun, A Bressan, M Büchele, E Burtin, W-C Chang, M Chiosso, I Choi, S U Chung, A Cicuttin, M L Crespo, Q Curiel, S Dalla Torre, S S Dasgupta, S Dasgupta, O Yu Denisov, L Dhara, S V Donskov, N Doshita, W Dünnweber, V Duic, M Dziewiecki, A Efremov, P D Eversheim, W Eyrich, M Faessler, A Ferrero, M Finger, M Finger, H Fischer, C Franco, N du Fresne von Hohenesche, J M Friedrich, V Frolov, F Gautheron, O P Gavrichtchouk, S Gerassimov, I Gnesi, M Gorzellik, S Grabmüller, A Grasso, M Grosse-Perdekamp, B Grube, T Grussenmeyer, A Guskov, F Haas, D Hahne, D von Harrach, R Hashimoto, F H Heinsius, F Herrmann, F Hinterberger, N Horikawa, N d'Hose, C-Yu Hsieh, S Huber, S Ishimoto, A Ivanov, Yu Ivanshin, T Iwata, R Jahn, V Jary, P Jörg, R Joosten, E Kabuß, B Ketzer, G V Khaustov, Yu A Khokhlov, Yu Kisselev, F Klein, K Klimaszewski, J H Koivuniemi, V N Kolosov, K Kondo, K Königsmann, I Konorov, V F Konstantinov, A M Kotzinian, O Kouznetsov, M Krämer, P Kremser, F Krinner, Z V Kroumchtein, N Kuchinski, F Kunne, K Kurek, R P Kurjata, A A Lednev, A Lehmann, M Levillain, S Levorato, J Lichtenstadt, A Maggiora, A Magnon, N Makins, N Makke, G K Mallot, C Marchand, A Martin, J Marzec, J Matousek, H Matsuda, T Matsuda, G Meshcheryakov, W Meyer, T Michigami, Yu V Mikhailov, Y Miyachi, A Nagaytsev, T Nagel, F Nerling, D Neyret, V I Nikolaenko, J Novy, W-D Nowak, A S Nunes, A G Olshevsky, I Orlov, M Ostrick, D Panzieri, B Parsamyan, S Paul, J-C Peng, F Pereira, M Pesek, D V Peshekhonov, S Platchkov, J Pochodzalla, V A Polyakov, J Pretz, M Quaresma, C Quintans, S Ramos, C Regali, G Reicherz, C Riedl, E Rocco, N S Rossiyskaya, D I Ryabchikov, A Rychter, V D Samoylenko, A Sandacz, C Santos, S Sarkar, I A Savin, G Sbrizzai, P Schiavon, S Schmeing, K Schmidt, H Schmieden, K Schönning, S Schopferer, T Schlüter, A Selyunin, O Yu Shevchenko, L Silva, L Sinha, S Sirtl, M Slunecka, F Sozzi, A Srnka, M Stolarski, M Sulc, H Suzuki, A Szabelski, T Szameitat, P Sznajder, S Takekawa, J Ter Wolbeek, S Tessaro, F Tessarotto, F Thibaud, V Tskhay, S Uhl, J Veloso, M Virius, S Wallner, T Weisrock, M Wilfert, K Zaremba, M Zavertyaev, E Zemlyanichkina, M Ziembicki, A Zink,

Affiliations

  1. Universität Erlangen-Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany.
  2. Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  3. University of Turin, Department of Physics, 10125 Turin, Italy.
  4. Torino Section of INFN, 10125 Turin, Italy.
  5. CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France.
  6. CERN, 1211 Geneva 23, Switzerland.
  7. Technische Universität München, Physik Department, 85748 Garching, Germany.
  8. University of Aveiro, Department of Physics, 3810-193 Aveiro, Portugal.
  9. University of Warsaw, Faculty of Physics, 02-093 Warsaw, Poland.
  10. Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany.
  11. Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany.
  12. Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany.
  13. Trieste Section of INFN, 34127 Trieste, Italy.
  14. Charles University in Prague, Faculty of Mathematics and Physics, 18000 Prague, Czech Republic.
  15. LIP, 1000-149 Lisbon, Portugal.
  16. University of Trieste, Department of Physics, 34127 Trieste, Italy.
  17. Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany.
  18. Academia Sinica, Institute of Physics, Taipei 11529, Taiwan.
  19. University of Illinois at Urbana-Champaign, Department of Physics, Urbana, Illinois 61801-3080, USA.
  20. Abdus Salam ICTP, 34151 Trieste, Italy.
  21. Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India.
  22. State Scientific Center Institute for High Energy Physics of National Research Center 'Kurchatov Institute', 142281 Protvino, Russia.
  23. Yamagata University, Yamagata 992-8510 Japan.
  24. University of Eastern Piedmont, 15100 Alessandria, Italy.
  25. Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany.
  26. Institute of Scientific Instruments, AS CR, 61264 Brno, Czech Republic.
  27. Technical University in Liberec, 46117 Liberec, Czech Republic.
  28. University of Miyazaki, Miyazaki 889-2192, Japan.
  29. Lebedev Physical Institute, 119991 Moscow, Russia.
  30. Nagoya University, 464 Nagoya, Japan.
  31. Czech Technical University in Prague, 16636 Prague, Czech Republic.
  32. Tel Aviv University, School of Physics and Astronomy, 69978 Tel Aviv, Israel.
  33. National Centre for Nuclear Research, 00-681 Warsaw, Poland.
  34. Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.

PMID: 26340182 DOI: 10.1103/PhysRevLett.115.082001

Abstract

The COMPASS Collaboration at CERN has measured diffractive dissociation of 190  GeV/c pions into the π(-)π(-)π(+) final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of 3π mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow peak is observed in the f0(980)π channel with spin, parity and C-parity quantum numbers J(PC)=1(++). We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with J(PC)=2(++) and 4(++) decaying into ρ(770)π and with J(PC)=1(++) decaying into f0(980)π. We identify a new a1 meson with mass (1414(-13)(+15))  MeV/c2 and width (153(-23)(+8))  MeV/c2. Within the final states investigated in our analysis, we observe the new a1(1420) decaying only into f0(980)π, suggesting its exotic nature.

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