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

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

doi:10.1103/PhysRevLett.115.082001

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

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. BodlakM. 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

Chair of Physics I

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

Abstract

The COMPASS Collaboration at CERN has measured diffractive dissociation of 190GeV/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 a₁meson with mass (1414_-13 ⁺¹⁵)MeV/c²and 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.

Original language	English
Article number	082001
Journal	Physical Review Letters
Volume	115
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.115.082001
State	Published - 19 Aug 2015

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10.1103/PhysRevLett.115.082001

Cite this

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., ... Zink, A. (2015). Observation of a New Narrow Axial-Vector Meson a₁(1420). Physical Review Letters, 115(8), Article 082001. https://doi.org/10.1103/PhysRevLett.115.082001

@article{aa0d98dc9c8d4f699019e70dbfb4141d,

title = "Observation of a New Narrow Axial-Vector Meson a1(1420)",

abstract = "The COMPASS Collaboration at CERN has measured diffractive dissociation of 190GeV/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 JPC=1++. We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with JPC=2++and 4++decaying into ρ(770)π and with JPC=1++decaying into f0(980)π. We identify a new a1meson with mass (1414-13 +15)MeV/c2and 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.",

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

note = "Publisher Copyright: {\textcopyright} 2015 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",

year = "2015",

month = aug,

day = "19",

doi = "10.1103/PhysRevLett.115.082001",

language = "English",

volume = "115",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "8",

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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 2015, 'Observation of a New Narrow Axial-Vector Meson a₁(1420)', Physical Review Letters, vol. 115, no. 8, 082001. https://doi.org/10.1103/PhysRevLett.115.082001

TY - JOUR

T1 - Observation of a New Narrow Axial-Vector Meson a1(1420)

AU - Adolph, C.

AU - Akhunzyanov, R.

AU - Alexeev, M. G.

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Andrieux, V.

AU - Anosov, V.

AU - Austregesilo, A.

AU - Azevedo, C.

AU - Badełek, B.

AU - Balestra, F.

AU - Barth, J.

AU - Beck, R.

AU - Bedfer, Y.

AU - Bernhard, J.

AU - Bicker, K.

AU - Bielert, E. R.

AU - Birsa, R.

AU - Bisplinghoff, J.

AU - Bodlak, M.

AU - Boer, M.

AU - Bordalo, P.

AU - Bradamante, F.

AU - Braun, C.

AU - Bressan, A.

AU - Büchele, M.

AU - Burtin, E.

AU - Chang, W. C.

AU - Chiosso, M.

AU - Choi, I.

AU - Chung, S. U.

AU - Cicuttin, A.

AU - Crespo, M. L.

AU - Curiel, Q.

AU - Dalla Torre, S.

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, O. Yu

AU - Dhara, L.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Dünnweber, W.

AU - Duic, V.

AU - Dziewiecki, M.

AU - Efremov, A.

AU - Eversheim, P. D.

AU - Eyrich, W.

AU - Faessler, M.

AU - Ferrero, A.

AU - Finger, M.

AU - Fischer, H.

AU - Franco, C.

AU - Du Fresne Von Hohenesche, N.

AU - Friedrich, J. M.

AU - Frolov, V.

AU - Gautheron, F.

AU - Gavrichtchouk, O. P.

AU - Gerassimov, S.

AU - Gnesi, I.

AU - Gorzellik, M.

AU - Grabmüller, S.

AU - Grasso, A.

AU - Grosse-Perdekamp, M.

AU - Grube, B.

AU - Grussenmeyer, T.

AU - Guskov, A.

AU - Haas, F.

AU - Hahne, D.

AU - Von Harrach, D.

AU - Hashimoto, R.

AU - Heinsius, F. H.

AU - Herrmann, F.

AU - Hinterberger, F.

AU - Horikawa, N.

AU - D'Hose, N.

AU - Hsieh, C. Yu

AU - Huber, S.

AU - Ishimoto, S.

AU - Ivanov, A.

AU - Ivanshin, Yu

AU - Iwata, T.

AU - Jahn, R.

AU - Jary, V.

AU - Jörg, P.

AU - Joosten, R.

AU - Kabuß, E.

AU - Ketzer, B.

AU - Khaustov, G. V.

AU - Khokhlov, Yu A.

AU - Kisselev, Yu

AU - Klein, F.

AU - Klimaszewski, K.

AU - Koivuniemi, J. H.

AU - Kolosov, V. N.

AU - Kondo, K.

AU - Königsmann, K.

AU - Konorov, I.

AU - Konstantinov, V. F.

AU - Kotzinian, A. M.

AU - Kouznetsov, O.

AU - Krämer, M.

AU - Kremser, P.

AU - Krinner, F.

AU - Kroumchtein, Z. V.

AU - Kuchinski, N.

AU - Kunne, F.

AU - Kurek, K.

AU - Kurjata, R. P.

AU - Lednev, A. A.

AU - Lehmann, A.

AU - Levillain, M.

AU - Levorato, S.

AU - Lichtenstadt, J.

AU - Maggiora, A.

AU - Magnon, A.

AU - Makins, N.

AU - Makke, N.

AU - Mallot, G. K.

AU - Marchand, C.

AU - Martin, A.

AU - Marzec, J.

AU - Matousek, J.

AU - Matsuda, H.

AU - Matsuda, T.

AU - Meshcheryakov, G.

AU - Meyer, W.

AU - Michigami, T.

AU - Mikhailov, Yu V.

AU - Miyachi, Y.

AU - Nagaytsev, A.

AU - Nagel, T.

AU - Nerling, F.

AU - Neyret, D.

AU - Nikolaenko, V. I.

AU - Novy, J.

AU - Nowak, W. D.

AU - Nunes, A. S.

AU - Olshevsky, A. G.

AU - Orlov, I.

AU - Ostrick, M.

AU - Panzieri, D.

AU - Parsamyan, B.

AU - Paul, S.

AU - Peng, J. C.

AU - Pereira, F.

AU - Pesek, M.

AU - Peshekhonov, D. V.

AU - Platchkov, S.

AU - Pochodzalla, J.

AU - Polyakov, V. A.

AU - Pretz, J.

AU - Quaresma, M.

AU - Quintans, C.

AU - Ramos, S.

AU - Regali, C.

AU - Reicherz, G.

AU - Riedl, C.

AU - Rocco, E.

AU - Rossiyskaya, N. S.

AU - Ryabchikov, D. I.

AU - Rychter, A.

AU - Samoylenko, V. D.

AU - Sandacz, A.

AU - Santos, C.

AU - Sarkar, S.

AU - Savin, I. A.

AU - Sbrizzai, G.

AU - Schiavon, P.

AU - Schmeing, S.

AU - Schmidt, K.

AU - Schmieden, H.

AU - Schönning, K.

AU - Schopferer, S.

AU - Schlüter, T.

AU - Selyunin, A.

AU - Shevchenko, O. Yu

AU - Silva, L.

AU - Sinha, L.

AU - Sirtl, S.

AU - Slunecka, M.

AU - Sozzi, F.

AU - Srnka, A.

AU - Stolarski, M.

AU - Sulc, M.

AU - Suzuki, H.

AU - Szabelski, A.

AU - Szameitat, T.

AU - Sznajder, P.

AU - Takekawa, S.

AU - Ter Wolbeek, J.

AU - Tessaro, S.

AU - Tessarotto, F.

AU - Thibaud, F.

AU - Tskhay, V.

AU - Uhl, S.

AU - Veloso, J.

AU - Virius, M.

AU - Wallner, S.

AU - Weisrock, T.

AU - Wilfert, M.

AU - Zaremba, K.

AU - Zavertyaev, M.

AU - Zemlyanichkina, E.

AU - Ziembicki, M.

AU - Zink, A.

N1 - Publisher Copyright: © 2015 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2015/8/19

Y1 - 2015/8/19

N2 - The COMPASS Collaboration at CERN has measured diffractive dissociation of 190GeV/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 JPC=1++. We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with JPC=2++and 4++decaying into ρ(770)π and with JPC=1++decaying into f0(980)π. We identify a new a1meson with mass (1414-13 +15)MeV/c2and 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.

AB - The COMPASS Collaboration at CERN has measured diffractive dissociation of 190GeV/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 JPC=1++. We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with JPC=2++and 4++decaying into ρ(770)π and with JPC=1++decaying into f0(980)π. We identify a new a1meson with mass (1414-13 +15)MeV/c2and 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.

UR - http://www.scopus.com/inward/record.url?scp=84940780129&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.115.082001

DO - 10.1103/PhysRevLett.115.082001

M3 - Article

AN - SCOPUS:84940780129

SN - 0031-9007

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 082001

ER -

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

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