Measurement of the charged-pion polarizability

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. Colantoni; M. L. Crespo; Q. Curiel; S. Dalla Torre; S. S. Dasgupta; S. Dasgupta; Yu Denisov; A. M. Dinkelbach; 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; N. Du Fresne 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. Grabmüller; A. Grasso; B. Grube; T. Grussenmeyer; A. Guskov; T. Guthörl; F. Haas; D. Von Harrach; D. Hahne; R. Hashimoto; F. H. Heinsius; F. Herrmann; F. Hinterberger; C. H. Höppner; N. Horikawa; N. D'Hose; S. Huber; S. Ishimoto; A. Ivanov; Yu Ivanshin; T. Iwata; R. Jahn; V. Jary; P. Jasinski; 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; Z. V. Kroumchtein; N. Kuchinski; R. Kuhn; F. Kunne; K. Kurek; R. P. Kurjata; A. A. Lednev; A. Lehmann; M. Levillain; S. Levorato; J. Lichtenstadt; A. Maggiora; A. Magnon; 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; M. A. Moinester; A. Nagaytsev; T. Nagel; F. Nerling; S. Neubert; D. Neyret; V. I. Nikolaenko; J. Novy; W. D. Nowak; A. S. Nunes; A. G. Olshevsky; I. Orlov; M. Ostrick; R. Panknin; D. Panzieri; B. Parsamyan; S. Paul; D. Peshekhonov; S. Platchkov; J. Pochodzalla; V. A. Polyakov; J. Pretz; M. Quaresma; C. Quintans; S. Ramos; C. Regali; G. Reicherz; E. Rocco; N. S. Rossiyskaya; D. I. Ryabchikov; A. Rychter; V. D. Samoylenko; A. Sandacz; S. Sarkar; I. A. Savin; G. Sbrizzai; P. Schiavon; C. Schill; T. Schlüter; K. Schmidt; H. Schmieden; K. Schönning; S. Schopferer; M. Schott; O. Yu 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; P. Sznajder; S. Takekawa; J. Ter Wolbeek; S. Tessaro; F. Tessarotto; F. Thibaud; S. Uhl; I. Uman; M. Virius; L. Wang; T. Weisrock; M. Wilfert; R. Windmolders; H. Wollny; K. Zaremba; M. Zavertyaev; E. Zemlyanichkina; M. Ziembicki; A. Zink

doi:10.1103/PhysRevLett.114.062002

Measurement of the charged-pion polarizability

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. Colantoni, M. L. Crespo, Q. Curiel, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, Yu Denisov, A. M. Dinkelbach, 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, N. Du Fresne 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. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, T. Guthörl, F. Haas, D. Von Harrach, D. Hahne, R. Hashimoto, F. H. Heinsius, F. Herrmann, F. Hinterberger, C. H. Höppner, N. Horikawa, N. D'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, 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, Z. V. Kroumchtein, N. Kuchinski, R. Kuhn, F. Kunne, K. Kurek, R. P. Kurjata, A. A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, 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, M. A. Moinester, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, J. Novy, W. D. Nowak, A. S. Nunes, A. G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D. Peshekhonov, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N. S. Rossiyskaya, D. I. Ryabchikov, A. Rychter, V. D. Samoylenko, A. Sandacz, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O. Yu 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, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, A. Zink

School of Physics and Astronomy

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

Abstract

The COMPASS collaboration at CERN has investigated pion Compton scattering, π-γ→π-γ, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction π-Ni→π-γNi, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q2<0.0015(GeV/c)2. From a sample of 63000 events, the pion electric polarizability is determined to be απ=(2.0±0.6stat±0.7syst)×10-4fm3 under the assumption απ=-βπ, which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.

Original language	English
Article number	062002
Journal	Physical Review Letters
Volume	114
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.114.062002
State	Published - 10 Feb 2015

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10.1103/PhysRevLett.114.062002

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., ... Zink, A. (2015). Measurement of the charged-pion polarizability. Physical Review Letters, 114(6), [062002]. https://doi.org/10.1103/PhysRevLett.114.062002

@article{3331f2436f7e4ef0916829435602e8dc,

title = "Measurement of the charged-pion polarizability",

abstract = "The COMPASS collaboration at CERN has investigated pion Compton scattering, π-γ→π-γ, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction π-Ni→π-γNi, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q2<0.0015(GeV/c)2. From a sample of 63000 events, the pion electric polarizability is determined to be απ=(2.0±0.6stat±0.7syst)×10-4fm3 under the assumption απ=-βπ, which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.",

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 M. Colantoni and Crespo, {M. L.} and Q. Curiel and {Dalla Torre}, S. and Dasgupta, {S. S.} and S. Dasgupta and Yu Denisov and Dinkelbach, {A. M.} 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 Fresne Von Hohenesche}, 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. Grabm{\"u}ller and A. Grasso and B. Grube and T. Grussenmeyer 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 H{\"o}ppner, {C. H.} and N. Horikawa and N. D'Hose and S. Huber and S. Ishimoto and A. Ivanov and Yu 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, {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 Kroumchtein, {Z. V.} and N. Kuchinski and R. Kuhn 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. 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 Moinester, {M. A.} 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 Olshevsky, {A. G.} and I. Orlov and M. Ostrick and R. Panknin and D. Panzieri and B. Parsamyan and S. Paul and D. Peshekhonov 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 E. Rocco and Rossiyskaya, {N. S.} and Ryabchikov, {D. I.} and A. Rychter 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 K. Schmidt and H. Schmieden and K. Sch{\"o}nning and S. Schopferer and M. Schott and Shevchenko, {O. Yu} 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 P. Sznajder and S. Takekawa and {Ter Wolbeek}, J. and S. Tessaro and F. Tessarotto and F. Thibaud and S. Uhl and I. Uman and M. Virius 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 M. Ziembicki and A. Zink",

note = "Publisher Copyright: {\textcopyright} 2015 Published by American Physical Society.",

year = "2015",

month = feb,

day = "10",

doi = "10.1103/PhysRevLett.114.062002",

language = "אנגלית",

volume = "114",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

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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, Colantoni, M, Crespo, ML, Curiel, Q, Dalla Torre, S, Dasgupta, SS, Dasgupta, S, Denisov, Y, Dinkelbach, AM, 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 Fresne Von Hohenesche, N, Friedrich, JM, Frolov, V, Gautheron, F, Gavrichtchouk, OP, Gerassimov, S, Geyer, R, Gnesi, I, Gobbo, B, Goertz, S, Gorzellik, M, Grabmüller, S, Grasso, A, Grube, B, Grussenmeyer, T, Guskov, A, Guthörl, T, Haas, F, Von Harrach, D, Hahne, D, Hashimoto, R, Heinsius, FH, Herrmann, F, Hinterberger, F, Höppner, CH, 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, Krämer, M, Kroumchtein, ZV, Kuchinski, N, Kuhn, R, Kunne, F, Kurek, K, Kurjata, RP, Lednev, AA, Lehmann, A, Levillain, M, Levorato, S, Lichtenstadt, J, Maggiora, A, Magnon, A, 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, Moinester, MA, Nagaytsev, A, Nagel, T, Nerling, F, Neubert, S, Neyret, D, Nikolaenko, VI, Novy, J, Nowak, WD, Nunes, AS, Olshevsky, AG, Orlov, I, Ostrick, M, Panknin, R, Panzieri, D, Parsamyan, B, Paul, S, Peshekhonov, D, Platchkov, S, Pochodzalla, J, Polyakov, VA, Pretz, J, Quaresma, M, Quintans, C, Ramos, S, Regali, C, Reicherz, G, Rocco, E, Rossiyskaya, NS, Ryabchikov, DI, Rychter, A, Samoylenko, VD, Sandacz, A, Sarkar, S, Savin, IA, Sbrizzai, G, Schiavon, P, Schill, C, Schlüter, T, 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, Sznajder, P, Takekawa, S, Ter Wolbeek, J, Tessaro, S, Tessarotto, F, Thibaud, F, Uhl, S, Uman, I, Virius, M, Wang, L, Weisrock, T, Wilfert, M, Windmolders, R, Wollny, H, Zaremba, K, Zavertyaev, M, Zemlyanichkina, E, Ziembicki, M & Zink, A 2015, 'Measurement of the charged-pion polarizability', Physical Review Letters, vol. 114, no. 6, 062002. https://doi.org/10.1103/PhysRevLett.114.062002

TY - JOUR

T1 - Measurement of the charged-pion polarizability

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 - Colantoni, M.

AU - Crespo, M. L.

AU - Curiel, Q.

AU - Dalla Torre, S.

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, Yu

AU - Dinkelbach, A. M.

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 Fresne Von Hohenesche, 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 - Grabmüller, S.

AU - Grasso, A.

AU - Grube, B.

AU - Grussenmeyer, T.

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 - Höppner, C. H.

AU - Horikawa, N.

AU - D'Hose, N.

AU - Huber, S.

AU - Ishimoto, S.

AU - Ivanov, A.

AU - Ivanshin, Yu

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, 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 - Kroumchtein, Z. V.

AU - Kuchinski, N.

AU - Kuhn, R.

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 - 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 - Moinester, M. A.

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 - Olshevsky, A. G.

AU - Orlov, I.

AU - Ostrick, M.

AU - Panknin, R.

AU - Panzieri, D.

AU - Parsamyan, B.

AU - Paul, S.

AU - Peshekhonov, D.

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 - Rocco, E.

AU - Rossiyskaya, N. S.

AU - Ryabchikov, D. I.

AU - Rychter, A.

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, K.

AU - Schmieden, H.

AU - Schönning, K.

AU - Schopferer, S.

AU - Schott, M.

AU - Shevchenko, O. Yu

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 - Sznajder, P.

AU - Takekawa, S.

AU - Ter Wolbeek, J.

AU - Tessaro, S.

AU - Tessarotto, F.

AU - Thibaud, F.

AU - Uhl, S.

AU - Uman, I.

AU - Virius, M.

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 - Ziembicki, M.

AU - Zink, A.

PY - 2015/2/10

Y1 - 2015/2/10

N2 - The COMPASS collaboration at CERN has investigated pion Compton scattering, π-γ→π-γ, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction π-Ni→π-γNi, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q2<0.0015(GeV/c)2. From a sample of 63000 events, the pion electric polarizability is determined to be απ=(2.0±0.6stat±0.7syst)×10-4fm3 under the assumption απ=-βπ, which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.

AB - The COMPASS collaboration at CERN has investigated pion Compton scattering, π-γ→π-γ, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction π-Ni→π-γNi, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q2<0.0015(GeV/c)2. From a sample of 63000 events, the pion electric polarizability is determined to be απ=(2.0±0.6stat±0.7syst)×10-4fm3 under the assumption απ=-βπ, which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.

UR - http://www.scopus.com/inward/record.url?scp=84922788721&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.114.062002

DO - 10.1103/PhysRevLett.114.062002

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AN - SCOPUS:84922788721

SN - 0031-9007

VL - 114

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 062002

ER -

Measurement of the charged-pion polarizability

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