Measurement of radiative widths of a2(1320) and π2(1670)

C. Adolph; R. Akhunzyanov; M. G. Alexeev; G. D. Alexeev; A. Amoroso; V. Andrieux; V. Anosov; A. Austregesilo; B. Badełek; F. Balestra; J. Barth; G. Baum; R. Beck; Y. Bedfer; A. Berlin; J. Bernhard; K. Bicker; J. Bieling; R. Birsa; J. Bisplinghoff; M. Bodlak; M. Boer; P. Bordalo; F. Bradamante; C. Braun; A. Bressan; M. Büchele; E. Burtin; L. Capozza; M. Chiosso; S. U. Chung; A. Cicuttin; M. L. Crespo; Q. Curiel; S. Dalla Torre; S. S. Dasgupta; S. Dasgupta; O. Y. Denisov; S. V. Donskov; N. Doshita; V. Duic; W. Dünnweber; M. Dziewiecki; A. Efremov; C. Elia; P. D. Eversheim; W. Eyrich; M. Faessler; A. Ferrero; A. Filin; M. Finger; M. Finger; H. Fischer; C. Franco; Fresne N. du von Hohenesche; J. M. Friedrich; V. Frolov; F. Gautheron; O. P. Gavrichtchouk; S. Gerassimov; R. Geyer; I. Gnesi; B. Gobbo; S. Goertz; M. Gorzellik; S. Grabmuller; A. Grasso; B. Grube; A. Guskov; T. Guthörl; F. Haas; D. Von Harrach; D. Hahne; R. Hashimoto; F. H. Heinsius; F. Herrmann; F. Hinterberger; Ch Hoppner; N. Horikawa; N. D'Hose; S. Huber; S. Ishimoto; A. Ivanov; Y. Ivanshin; T. Iwata; R. Jahn; V. Jary; P. Jasinski; P. Jörg; R. Joosten; E. Kabuß; B. Ketzer; G. V. Khaustov; Y. A. Khokhlov; Y. 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; Z. Kral; M. Krämer; Z. V. Kroumchtein; N. Kuchinski; F. Kunne; K. Kurek; R. P. Kurjata; A. A. Lednev; A. Lehmann; S. Levorato; A. Maggiora; A. Magnon; N. Makke; G. K. Mallot; C. Marchand; A. Martin; J. Marzec; J. Matousek; H. Matsuda; G. Meshcheryakov; W. Meyer; T. Michigami; Y. V. Mikhailov; Y. Miyachi; A. Nagaytsev; T. Nagel; F. Nerling; S. Neubert; D. Neyret; V. I. Nikolaenko; J. Novy; W. D. Nowak; A. S. Nunes; I. Orlov; A. G. Olshevsky; M. Ostrick; R. Panknin; D. Panzieri; B. Parsamyan; S. Paul; M. Pesek; S. Platchkov; J. Pochodzalla; V. A. Polyakov; J. Pretz; M. Quaresma; C. Quintans; S. Ramos; G. Reicherz; E. Rocco; A. Rychter; N. S. Rossiyskaya; D. I. Ryabchikov; V. D. Samoylenko; A. Sandacz; S. Sarkar; I. A. Savin; G. Sbrizzai; P. Schiavon; C. Schill; T. Schlüter; A. Schmidt; K. Schmidt; H. Schmieden; K. Schönning; S. Schopferer; M. Schott; O. Y. Shevchenko; L. Silva; L. Sinha; S. Sirtl; M. Slunecka; S. Sosio; F. Sozzi; A. Srnka; L. Steiger; M. Stolarski; M. Sulc; R. Sulej; H. Suzuki; A. Szabelski; T. Szameitat; S. Takekawa; J. ter Wolbeek; S. Tessaro; F. Tessarotto; F. Thibaud; S. Uhl; I. Uman; M. Vandenbroucke; M. Virius; J. Vondra; L. Wang; T. Weisrock; M. Wilfert; R. Windmolders; H. Wollny; K. Zaremba; M. Zavertyaev; E. Zemlyanichkina; T. Matsuda; J. Lichtenstadt; P. Sznajder; M. Ziembicki

doi:10.1140/epja/i2014-14079-8

Measurement of radiative widths of a₂(1320) and π₂(1670)

C. Adolph, R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, J. Bieling, R. Birsa, J. BisplinghoffM. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, Q. Curiel, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, O. Y. Denisov, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, H. Fischer, C. Franco, Fresne N. du von Hohenesche, J. M. Friedrich, V. Frolov, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmuller, A. Grasso, B. Grube, A. Guskov, T. Guthörl, F. Haas, D. Von Harrach, D. Hahne, R. Hashimoto, F. H. Heinsius, F. Herrmann, F. Hinterberger, Ch Hoppner, N. Horikawa, N. D'Hose, S. Huber, S. Ishimoto, A. Ivanov, Y. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G. V. Khaustov, Y. A. Khokhlov, Y. 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, Z. Kral, M. Krämer, Z. V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R. P. Kurjata, A. A. Lednev, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, N. Makke, G. K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Y. V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, J. Novy, W. D. Nowak, A. S. Nunes, I. Orlov, A. G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, A. Rychter, N. S. Rossiyskaya, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O. Y. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, T. Matsuda, J. Lichtenstadt, P. Sznajder, M. Ziembicki

Chair of Physics I

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

13 Scopus citations

Abstract

The COMPASS Collaboration at CERN has investigated the reaction π̄γ → π̄π̄π⁺ embedded in the Primakoff reaction of 190 GeV pions scattering in the Coulomb field of a lead target, π̄Pb → π̄π̄π⁺ Pb. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below 0.001 (GeV/c)². Using a partial-wave analysis the amplitudes and relative phases of the a₂(1320) and π₂(1670) mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the a₂(1320) to be Γ₀(a₂(1320) → πγ) = (358 ± 6_stat ± 42_syst) keV. As the first measurement, Γ₀(π₂(1670) → πγ) = (181 ± 11_stat ± 27_syst)keV · (BR_f2π /BR/_f2π) is obtained for the radiative width of the π₂(1670), where in this analysis the branching ratio BRf_f2π^PDG = 0.56 has been used. We compare these values to previous measurements and theoretical predictions.

Original language	English
Article number	79
Pages (from-to)	1-19
Number of pages	19
Journal	European Physical Journal A
Volume	50
Issue number	4
DOIs	https://doi.org/10.1140/epja/i2014-14079-8
State	Published - 2014

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10.1140/epja/i2014-14079-8

Cite this

Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., ... Ziembicki, M. (2014). Measurement of radiative widths of a₂(1320) and π₂(1670). European Physical Journal A, 50(4), 1-19. Article 79. https://doi.org/10.1140/epja/i2014-14079-8

@article{8686f8ff42444dac8a2823f9ad657bcb,

title = "Measurement of radiative widths of a2(1320) and π2(1670)",

abstract = "The COMPASS Collaboration at CERN has investigated the reaction {\=π}γ → {\=π}{\=π}π+ embedded in the Primakoff reaction of 190 GeV pions scattering in the Coulomb field of a lead target, {\=π}Pb → {\=π}{\=π}π+ Pb. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below 0.001 (GeV/c)2. Using a partial-wave analysis the amplitudes and relative phases of the a2(1320) and π2(1670) mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the a2(1320) to be Γ0(a2(1320) → πγ) = (358 ± 6stat ± 42syst) keV. As the first measurement, Γ0(π2(1670) → πγ) = (181 ± 11stat ± 27syst)keV · (BRf2π /BR/f2π) is obtained for the radiative width of the π2(1670), where in this analysis the branching ratio BRff2πPDG = 0.56 has been used. We compare these values to previous measurements and theoretical predictions.",

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 B. Bade{\l}ek and F. Balestra and J. Barth and G. Baum and R. Beck and Y. Bedfer and A. Berlin and J. Bernhard and K. Bicker and J. Bieling 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 L. Capozza and M. Chiosso and Chung, {S. U.} and A. Cicuttin and Crespo, {M. L.} and Q. Curiel and Torre, {S. Dalla} and Dasgupta, {S. S.} and S. Dasgupta and Denisov, {O. Y.} and Donskov, {S. V.} and N. Doshita and V. Duic and W. D{\"u}nnweber and M. Dziewiecki and A. Efremov and C. Elia and Eversheim, {P. D.} and W. Eyrich and M. Faessler and A. Ferrero and A. Filin and M. Finger and M. Finger and H. Fischer and C. Franco and {du von Hohenesche}, {Fresne N.} and Friedrich, {J. M.} and V. Frolov and F. Gautheron and Gavrichtchouk, {O. P.} and S. Gerassimov and R. Geyer and I. Gnesi and B. Gobbo and S. Goertz and M. Gorzellik and S. Grabmuller and A. Grasso and B. Grube and A. Guskov and T. Guth{\"o}rl and F. Haas and {Von Harrach}, D. and D. Hahne and R. Hashimoto and Heinsius, {F. H.} and F. Herrmann and F. Hinterberger and Ch Hoppner and N. Horikawa and N. D'Hose and S. Huber and S. Ishimoto and A. Ivanov and Y. Ivanshin and T. Iwata and R. Jahn and V. Jary and P. Jasinski and P. J{\"o}rg and R. Joosten and E. Kabu{\ss} and B. Ketzer and Khaustov, {G. V.} and Khokhlov, {Y. A.} and Y. 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 Z. Kral and M. Kr{\"a}mer 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 S. Levorato and A. Maggiora and A. Magnon and N. Makke and Mallot, {G. K.} and C. Marchand and A. Martin and J. Marzec and J. Matousek and H. Matsuda and G. Meshcheryakov and W. Meyer and T. Michigami and Mikhailov, {Y. V.} and Y. Miyachi and A. Nagaytsev and T. Nagel and F. Nerling and S. Neubert and D. Neyret and Nikolaenko, {V. I.} and J. Novy and Nowak, {W. D.} and Nunes, {A. S.} and I. Orlov and Olshevsky, {A. G.} and M. Ostrick and R. Panknin and D. Panzieri and B. Parsamyan and S. Paul and M. Pesek and S. Platchkov and J. Pochodzalla and Polyakov, {V. A.} and J. Pretz and M. Quaresma and C. Quintans and S. Ramos and G. Reicherz and E. Rocco and A. Rychter and Rossiyskaya, {N. S.} and Ryabchikov, {D. I.} and Samoylenko, {V. D.} and A. Sandacz and S. Sarkar and Savin, {I. A.} and G. Sbrizzai and P. Schiavon and C. Schill and T. Schl{\"u}ter and A. Schmidt and K. Schmidt and H. Schmieden and K. Sch{\"o}nning and S. Schopferer and M. Schott and Shevchenko, {O. Y.} and L. Silva and L. Sinha and S. Sirtl and M. Slunecka and S. Sosio and F. Sozzi and A. Srnka and L. Steiger and M. Stolarski and M. Sulc and R. Sulej and H. Suzuki and A. Szabelski and T. Szameitat and S. Takekawa and {ter Wolbeek}, J. and S. Tessaro and F. Tessarotto and F. Thibaud and S. Uhl and I. Uman and M. Vandenbroucke and M. Virius and J. Vondra and L. Wang and T. Weisrock and M. Wilfert and R. Windmolders and H. Wollny and K. Zaremba and M. Zavertyaev and E. Zemlyanichkina and T. Matsuda and J. Lichtenstadt and P. Sznajder and M. Ziembicki",

year = "2014",

doi = "10.1140/epja/i2014-14079-8",

language = "English",

volume = "50",

pages = "1--19",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "4",

}

Adolph, C, Akhunzyanov, R, Alexeev, MG, Alexeev, GD, Amoroso, A, Andrieux, V, Anosov, V, Austregesilo, A, Badełek, B, Balestra, F, Barth, J, Baum, G, Beck, R, Bedfer, Y, Berlin, A, Bernhard, J, Bicker, K, Bieling, J, Birsa, R, Bisplinghoff, J, Bodlak, M, Boer, M, Bordalo, P, Bradamante, F, Braun, C, Bressan, A, Büchele, M, Burtin, E, Capozza, L, Chiosso, M, Chung, SU, Cicuttin, A, Crespo, ML, Curiel, Q, Torre, SD, Dasgupta, SS, Dasgupta, S, Denisov, OY, Donskov, SV, Doshita, N, Duic, V, Dünnweber, W, Dziewiecki, M, Efremov, A, Elia, C, Eversheim, PD, Eyrich, W, Faessler, M, Ferrero, A, Filin, A, Finger, M, Finger, M, Fischer, H, Franco, C, du von Hohenesche, FN, Friedrich, JM, Frolov, V, Gautheron, F, Gavrichtchouk, OP, Gerassimov, S, Geyer, R, Gnesi, I, Gobbo, B, Goertz, S, Gorzellik, M, Grabmuller, S, Grasso, A, Grube, B, Guskov, A, Guthörl, T, Haas, F, Von Harrach, D, Hahne, D, Hashimoto, R, Heinsius, FH, Herrmann, F, Hinterberger, F, Hoppner, C, Horikawa, N, D'Hose, N, Huber, S, Ishimoto, S, Ivanov, A, Ivanshin, Y, Iwata, T, Jahn, R, Jary, V, Jasinski, P, 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, Kral, Z, Krämer, M, Kroumchtein, ZV, Kuchinski, N, Kunne, F, Kurek, K, Kurjata, RP, Lednev, AA, Lehmann, A, Levorato, S, Maggiora, A, Magnon, A, Makke, N, Mallot, GK, Marchand, C, Martin, A, Marzec, J, Matousek, J, Matsuda, H, Meshcheryakov, G, Meyer, W, Michigami, T, Mikhailov, YV, Miyachi, Y, Nagaytsev, A, Nagel, T, Nerling, F, Neubert, S, Neyret, D, Nikolaenko, VI, Novy, J, Nowak, WD, Nunes, AS, Orlov, I, Olshevsky, AG, Ostrick, M, Panknin, R, Panzieri, D, Parsamyan, B, Paul, S, Pesek, M, Platchkov, S, Pochodzalla, J, Polyakov, VA, Pretz, J, Quaresma, M, Quintans, C, Ramos, S, Reicherz, G, Rocco, E, Rychter, A, Rossiyskaya, NS, Ryabchikov, DI, Samoylenko, VD, Sandacz, A, Sarkar, S, Savin, IA, Sbrizzai, G, Schiavon, P, Schill, C, Schlüter, T, Schmidt, A, Schmidt, K, Schmieden, H, Schönning, K, Schopferer, S, Schott, M, Shevchenko, OY, Silva, L, Sinha, L, Sirtl, S, Slunecka, M, Sosio, S, Sozzi, F, Srnka, A, Steiger, L, Stolarski, M, Sulc, M, Sulej, R, Suzuki, H, Szabelski, A, Szameitat, T, Takekawa, S, ter Wolbeek, J, Tessaro, S, Tessarotto, F, Thibaud, F, Uhl, S, Uman, I, Vandenbroucke, M, Virius, M, Vondra, J, Wang, L, Weisrock, T, Wilfert, M, Windmolders, R, Wollny, H, Zaremba, K, Zavertyaev, M, Zemlyanichkina, E, Matsuda, T, Lichtenstadt, J, Sznajder, P & Ziembicki, M 2014, 'Measurement of radiative widths of a₂(1320) and π₂(1670)', European Physical Journal A, vol. 50, no. 4, 79, pp. 1-19. https://doi.org/10.1140/epja/i2014-14079-8

TY - JOUR

T1 - Measurement of radiative widths of a2(1320) and π2(1670)

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 - Badełek, B.

AU - Balestra, F.

AU - Barth, J.

AU - Baum, G.

AU - Beck, R.

AU - Bedfer, Y.

AU - Berlin, A.

AU - Bernhard, J.

AU - Bicker, K.

AU - Bieling, J.

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 - Capozza, L.

AU - Chiosso, M.

AU - Chung, S. U.

AU - Cicuttin, A.

AU - Crespo, M. L.

AU - Curiel, Q.

AU - Torre, S. Dalla

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, O. Y.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Duic, V.

AU - Dünnweber, W.

AU - Dziewiecki, M.

AU - Efremov, A.

AU - Elia, C.

AU - Eversheim, P. D.

AU - Eyrich, W.

AU - Faessler, M.

AU - Ferrero, A.

AU - Filin, A.

AU - Finger, M.

AU - Fischer, H.

AU - Franco, C.

AU - du von Hohenesche, Fresne N.

AU - Friedrich, J. M.

AU - Frolov, V.

AU - Gautheron, F.

AU - Gavrichtchouk, O. P.

AU - Gerassimov, S.

AU - Geyer, R.

AU - Gnesi, I.

AU - Gobbo, B.

AU - Goertz, S.

AU - Gorzellik, M.

AU - Grabmuller, S.

AU - Grasso, A.

AU - Grube, B.

AU - Guskov, A.

AU - Guthörl, T.

AU - Haas, F.

AU - Von Harrach, D.

AU - Hahne, D.

AU - Hashimoto, R.

AU - Heinsius, F. H.

AU - Herrmann, F.

AU - Hinterberger, F.

AU - Hoppner, Ch

AU - Horikawa, N.

AU - D'Hose, N.

AU - Huber, S.

AU - Ishimoto, S.

AU - Ivanov, A.

AU - Ivanshin, Y.

AU - Iwata, T.

AU - Jahn, R.

AU - Jary, V.

AU - Jasinski, P.

AU - Jörg, P.

AU - Joosten, R.

AU - Kabuß, E.

AU - Ketzer, B.

AU - Khaustov, G. V.

AU - Khokhlov, Y. A.

AU - Kisselev, Y.

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 - Kral, Z.

AU - Krämer, M.

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 - Levorato, S.

AU - Maggiora, A.

AU - Magnon, A.

AU - Makke, N.

AU - Mallot, G. K.

AU - Marchand, C.

AU - Martin, A.

AU - Marzec, J.

AU - Matousek, J.

AU - Matsuda, H.

AU - Meshcheryakov, G.

AU - Meyer, W.

AU - Michigami, T.

AU - Mikhailov, Y. V.

AU - Miyachi, Y.

AU - Nagaytsev, A.

AU - Nagel, T.

AU - Nerling, F.

AU - Neubert, S.

AU - Neyret, D.

AU - Nikolaenko, V. I.

AU - Novy, J.

AU - Nowak, W. D.

AU - Nunes, A. S.

AU - Orlov, I.

AU - Olshevsky, A. G.

AU - Ostrick, M.

AU - Panknin, R.

AU - Panzieri, D.

AU - Parsamyan, B.

AU - Paul, S.

AU - Pesek, M.

AU - Platchkov, S.

AU - Pochodzalla, J.

AU - Polyakov, V. A.

AU - Pretz, J.

AU - Quaresma, M.

AU - Quintans, C.

AU - Ramos, S.

AU - Reicherz, G.

AU - Rocco, E.

AU - Rychter, A.

AU - Rossiyskaya, N. S.

AU - Ryabchikov, D. I.

AU - Samoylenko, V. D.

AU - Sandacz, A.

AU - Sarkar, S.

AU - Savin, I. A.

AU - Sbrizzai, G.

AU - Schiavon, P.

AU - Schill, C.

AU - Schlüter, T.

AU - Schmidt, A.

AU - Schmidt, K.

AU - Schmieden, H.

AU - Schönning, K.

AU - Schopferer, S.

AU - Schott, M.

AU - Shevchenko, O. Y.

AU - Silva, L.

AU - Sinha, L.

AU - Sirtl, S.

AU - Slunecka, M.

AU - Sosio, S.

AU - Sozzi, F.

AU - Srnka, A.

AU - Steiger, L.

AU - Stolarski, M.

AU - Sulc, M.

AU - Sulej, R.

AU - Suzuki, H.

AU - Szabelski, A.

AU - Szameitat, T.

AU - Takekawa, S.

AU - ter Wolbeek, J.

AU - Tessaro, S.

AU - Tessarotto, F.

AU - Thibaud, F.

AU - Uhl, S.

AU - Uman, I.

AU - Vandenbroucke, M.

AU - Virius, M.

AU - Vondra, J.

AU - Wang, L.

AU - Weisrock, T.

AU - Wilfert, M.

AU - Windmolders, R.

AU - Wollny, H.

AU - Zaremba, K.

AU - Zavertyaev, M.

AU - Zemlyanichkina, E.

AU - Matsuda, T.

AU - Lichtenstadt, J.

AU - Sznajder, P.

AU - Ziembicki, M.

PY - 2014

Y1 - 2014

N2 - The COMPASS Collaboration at CERN has investigated the reaction π̄γ → π̄π̄π+ embedded in the Primakoff reaction of 190 GeV pions scattering in the Coulomb field of a lead target, π̄Pb → π̄π̄π+ Pb. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below 0.001 (GeV/c)2. Using a partial-wave analysis the amplitudes and relative phases of the a2(1320) and π2(1670) mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the a2(1320) to be Γ0(a2(1320) → πγ) = (358 ± 6stat ± 42syst) keV. As the first measurement, Γ0(π2(1670) → πγ) = (181 ± 11stat ± 27syst)keV · (BRf2π /BR/f2π) is obtained for the radiative width of the π2(1670), where in this analysis the branching ratio BRff2πPDG = 0.56 has been used. We compare these values to previous measurements and theoretical predictions.

AB - The COMPASS Collaboration at CERN has investigated the reaction π̄γ → π̄π̄π+ embedded in the Primakoff reaction of 190 GeV pions scattering in the Coulomb field of a lead target, π̄Pb → π̄π̄π+ Pb. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below 0.001 (GeV/c)2. Using a partial-wave analysis the amplitudes and relative phases of the a2(1320) and π2(1670) mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the a2(1320) to be Γ0(a2(1320) → πγ) = (358 ± 6stat ± 42syst) keV. As the first measurement, Γ0(π2(1670) → πγ) = (181 ± 11stat ± 27syst)keV · (BRf2π /BR/f2π) is obtained for the radiative width of the π2(1670), where in this analysis the branching ratio BRff2πPDG = 0.56 has been used. We compare these values to previous measurements and theoretical predictions.

UR - http://www.scopus.com/inward/record.url?scp=84899636152&partnerID=8YFLogxK

U2 - 10.1140/epja/i2014-14079-8

DO - 10.1140/epja/i2014-14079-8

M3 - Article

AN - SCOPUS:84899636152

SN - 1434-6001

VL - 50

SP - 1

EP - 19

JO - European Physical Journal A

JF - European Physical Journal A

IS - 4

M1 - 79

ER -

Measurement of radiative widths of a₂(1320) and π₂(1670)

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