Exclusive measurement of the η→π +π -γ decay

P. Adlarson; C. Adolph; W. Augustyniak; W. Bardan; M. Bashkanov; T. Bednarski; F. S. Bergmann; M. Berłowski; H. Bhatt; K. T. Brinkmann; M. Büscher; H. Calén; H. Clement; D. Coderre; E. Czerwiński; E. Doroshkevich; R. Engels; W. Erven; W. Eyrich; P. Fedorets; K. Föhl; K. Fransson; F. Goldenbaum; P. Goslawski; K. Grigoryev; C. O. Gullström; C. Hanhart; L. Heijkenskjöld; J. Heimlich; V. Hejny; F. Hinterberger; M. Hodana; B. Höistad; M. Jacewicz; A. Jany; B. R. Jany; L. Jarczyk; T. Johansson; B. Kamys; G. Kemmerling; O. Khakimova; A. Khoukaz; S. Kistryn; J. Klaja; H. Kleines; B. Kłos; F. Kren; W. Krzemień; P. Kulessa; A. Kupść; K. Lalwani; S. Leupold; B. Lorentz; A. Magiera; R. Maier; B. Mariański; P. Marciniewski; U. G. Meißner; M. Mikirtychiants; H. P. Morsch; P. Moskal; B. K. Nandi; S. Niedźwiecki; H. Ohm; A. Passfeld; C. Pauly; E. Perez del Rio; T. Petri; Y. Petukhov; N. Piskunov; P. Pluciński; P. Podkopał; A. Povtoreyko; D. Prasuhn; A. Pricking; K. Pysz; A. Pyszniak; T. Rausmann; C. F. Redmer; J. Ritman; Z. Rudy; S. Sawant; S. Schadmand; A. Schmidt; T. Sefzick; V. Serdyuk; M. Siemaszko; R. Siudak; T. Skorodko; M. Skurzok; J. Smyrski; V. Sopov; R. Stassen; J. Stepaniak; G. Sterzenbach; H. Stockhorst; F. Stollenwerk; H. Ströher; A. Szczurek; A. Täschner; C. Terschlüsen; T. Tolba; A. Trzciński; R. Varma; P. Vlasov; G. J. Wagner; W. Weglorz; A. Winnemöller; A. Wirzba; M. Wolke; A. Wrońska; P. Wüstner; P. Wurm; X. Yuan; L. Yurev; J. Zabierowski; M. J. Zieliński; W. Zipper; J. Złomańczuk; P. Zuprański

doi:10.1016/j.physletb.2011.12.027

Exclusive measurement of the η→π ⁺π ^-γ decay

P. Adlarson, C. Adolph, W. Augustyniak, W. Bardan, M. Bashkanov, T. Bednarski, F. S. Bergmann, M. Berłowski, H. Bhatt, K. T. Brinkmann, M. Büscher, H. Calén, H. Clement, D. Coderre, E. Czerwiński, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. FedoretsK. Föhl, K. Fransson, F. Goldenbaum, P. Goslawski, K. Grigoryev, C. O. Gullström, C. Hanhart, L. Heijkenskjöld, J. Heimlich, V. Hejny, F. Hinterberger, M. Hodana, B. Höistad, M. Jacewicz, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, O. Khakimova, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Kłos, F. Kren, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, S. Leupold, B. Lorentz, A. Magiera, R. Maier, B. Mariański, P. Marciniewski, U. G. Meißner, M. Mikirtychiants, H. P. Morsch, P. Moskal, B. K. Nandi, S. Niedźwiecki, H. Ohm, A. Passfeld, C. Pauly, E. Perez del Rio, T. Petri, Y. Petukhov, N. Piskunov, P. Pluciński, P. Podkopał, A. Povtoreyko, D. Prasuhn, A. Pricking, K. Pysz, A. Pyszniak, T. Rausmann, C. F. Redmer^*, J. Ritman, Z. Rudy, S. Sawant, S. Schadmand, A. Schmidt, T. Sefzick, V. Serdyuk, M. Siemaszko, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, G. Sterzenbach, H. Stockhorst, F. Stollenwerk, H. Ströher, A. Szczurek, A. Täschner, C. Terschlüsen, T. Tolba, A. Trzciński, R. Varma, P. Vlasov, G. J. Wagner, W. Weglorz, A. Winnemöller, A. Wirzba, M. Wolke, A. Wrońska, P. Wüstner, P. Wurm, X. Yuan, L. Yurev, J. Zabierowski, M. J. Zieliński, W. Zipper, J. Złomańczuk, P. Zuprański

^*Corresponding author for this work

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

Abstract

An exclusive measurement of the decay η→π ⁺π ^-γ has been performed at the WASA facility at COSY. The η mesons were produced in the fusion reaction pd→He3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13960±140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of η→π ⁺π ^-γ. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the π ⁺π ^- system.

Original language	English
Pages (from-to)	243-249
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	707
Issue number	2
DOIs	https://doi.org/10.1016/j.physletb.2011.12.027
Publication status	Published - 20 Jan 2012

Keywords

η meson
Box anomaly
Exclusive measurement

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10.1016/j.physletb.2011.12.027

Cite this

Adlarson, P., Adolph, C., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berłowski, M., Bhatt, H., Brinkmann, K. T., Büscher, M., Calén, H., Clement, H., Coderre, D., Czerwiński, E., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., ... Zuprański, P. (2012). Exclusive measurement of the η→π ⁺π ^-γ decay. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 707(2), 243-249. https://doi.org/10.1016/j.physletb.2011.12.027

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title = "Exclusive measurement of the η→π +π -γ decay",

abstract = "An exclusive measurement of the decay η→π +π -γ has been performed at the WASA facility at COSY. The η mesons were produced in the fusion reaction pd→He3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13960±140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of η→π +π -γ. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the π +π - system.",

keywords = "η meson, Box anomaly, Exclusive measurement",

author = "P. Adlarson and C. Adolph and W. Augustyniak and W. Bardan and M. Bashkanov and T. Bednarski and Bergmann, {F. S.} and M. Ber{\l}owski and H. Bhatt and Brinkmann, {K. T.} and M. B{\"u}scher and H. Cal{\'e}n and H. Clement and D. Coderre and E. Czerwi{\'n}ski and E. Doroshkevich and R. Engels and W. Erven and W. Eyrich and P. Fedorets and K. F{\"o}hl and K. Fransson and F. Goldenbaum and P. Goslawski and K. Grigoryev and Gullstr{\"o}m, {C. O.} and C. Hanhart and L. Heijkenskj{\"o}ld and J. Heimlich and V. Hejny and F. Hinterberger and M. Hodana and B. H{\"o}istad and M. Jacewicz and A. Jany and Jany, {B. R.} and L. Jarczyk and T. Johansson and B. Kamys and G. Kemmerling and O. Khakimova and A. Khoukaz and S. Kistryn and J. Klaja and H. Kleines and B. K{\l}os and F. Kren and W. Krzemie{\'n} and P. Kulessa and A. Kup{\'s}{\'c} and K. Lalwani and S. Leupold and B. Lorentz and A. Magiera and R. Maier and B. Maria{\'n}ski and P. Marciniewski and Mei{\ss}ner, {U. G.} and M. Mikirtychiants and Morsch, {H. P.} and P. Moskal and Nandi, {B. K.} and S. Nied{\'z}wiecki and H. Ohm and A. Passfeld and C. Pauly and {Perez del Rio}, E. and T. Petri and Y. Petukhov and N. Piskunov and P. Pluci{\'n}ski and P. Podkopa{\l} and A. Povtoreyko and D. Prasuhn and A. Pricking and K. Pysz and A. Pyszniak and T. Rausmann and Redmer, {C. F.} and J. Ritman and Z. Rudy and S. Sawant and S. Schadmand and A. Schmidt and T. Sefzick and V. Serdyuk and M. Siemaszko and R. Siudak and T. Skorodko and M. Skurzok and J. Smyrski and V. Sopov and R. Stassen and J. Stepaniak and G. Sterzenbach and H. Stockhorst and F. Stollenwerk and H. Str{\"o}her and A. Szczurek and A. T{\"a}schner and C. Terschl{\"u}sen and T. Tolba and A. Trzci{\'n}ski and R. Varma and P. Vlasov and Wagner, {G. J.} and W. Weglorz and A. Winnem{\"o}ller and A. Wirzba and M. Wolke and A. Wro{\'n}ska and P. W{\"u}stner and P. Wurm and X. Yuan and L. Yurev and J. Zabierowski and Zieli{\'n}ski, {M. J.} and W. Zipper and J. Z{\l}oma{\'n}czuk and P. Zupra{\'n}ski",

year = "2012",

month = jan,

day = "20",

doi = "10.1016/j.physletb.2011.12.027",

language = "English",

volume = "707",

pages = "243--249",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "2",

}

Adlarson, P, Adolph, C, Augustyniak, W, Bardan, W, Bashkanov, M, Bednarski, T, Bergmann, FS, Berłowski, M, Bhatt, H, Brinkmann, KT, Büscher, M, Calén, H, Clement, H, Coderre, D, Czerwiński, E, Doroshkevich, E, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Föhl, K, Fransson, K, Goldenbaum, F, Goslawski, P, Grigoryev, K, Gullström, CO, Hanhart, C, Heijkenskjöld, L, Heimlich, J, Hejny, V, Hinterberger, F, Hodana, M, Höistad, B, Jacewicz, M, Jany, A, Jany, BR, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Khakimova, O, Khoukaz, A, Kistryn, S, Klaja, J, Kleines, H, Kłos, B, Kren, F, Krzemień, W, Kulessa, P, Kupść, A, Lalwani, K, Leupold, S, Lorentz, B, Magiera, A, Maier, R, Mariański, B, Marciniewski, P, Meißner, UG, Mikirtychiants, M, Morsch, HP, Moskal, P, Nandi, BK, Niedźwiecki, S, Ohm, H, Passfeld, A, Pauly, C, Perez del Rio, E, Petri, T, Petukhov, Y, Piskunov, N, Pluciński, P, Podkopał, P, Povtoreyko, A, Prasuhn, D, Pricking, A, Pysz, K, Pyszniak, A, Rausmann, T, Redmer, CF, Ritman, J, Rudy, Z, Sawant, S, Schadmand, S, Schmidt, A, Sefzick, T, Serdyuk, V, Siemaszko, M, Siudak, R, Skorodko, T, Skurzok, M, Smyrski, J, Sopov, V, Stassen, R, Stepaniak, J, Sterzenbach, G, Stockhorst, H, Stollenwerk, F, Ströher, H, Szczurek, A, Täschner, A, Terschlüsen, C, Tolba, T, Trzciński, A, Varma, R, Vlasov, P, Wagner, GJ, Weglorz, W, Winnemöller, A, Wirzba, A, Wolke, M, Wrońska, A, Wüstner, P, Wurm, P, Yuan, X, Yurev, L, Zabierowski, J, Zieliński, MJ, Zipper, W, Złomańczuk, J & Zuprański, P 2012, 'Exclusive measurement of the η→π ⁺π ^-γ decay', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 707, no. 2, pp. 243-249. https://doi.org/10.1016/j.physletb.2011.12.027

TY - JOUR

T1 - Exclusive measurement of the η→π +π -γ decay

AU - Adlarson, P.

AU - Adolph, C.

AU - Augustyniak, W.

AU - Bardan, W.

AU - Bashkanov, M.

AU - Bednarski, T.

AU - Bergmann, F. S.

AU - Berłowski, M.

AU - Bhatt, H.

AU - Brinkmann, K. T.

AU - Büscher, M.

AU - Calén, H.

AU - Clement, H.

AU - Coderre, D.

AU - Czerwiński, E.

AU - Doroshkevich, E.

AU - Engels, R.

AU - Erven, W.

AU - Eyrich, W.

AU - Fedorets, P.

AU - Föhl, K.

AU - Fransson, K.

AU - Goldenbaum, F.

AU - Goslawski, P.

AU - Grigoryev, K.

AU - Gullström, C. O.

AU - Hanhart, C.

AU - Heijkenskjöld, L.

AU - Heimlich, J.

AU - Hejny, V.

AU - Hinterberger, F.

AU - Hodana, M.

AU - Höistad, B.

AU - Jacewicz, M.

AU - Jany, A.

AU - Jany, B. R.

AU - Jarczyk, L.

AU - Johansson, T.

AU - Kamys, B.

AU - Kemmerling, G.

AU - Khakimova, O.

AU - Khoukaz, A.

AU - Kistryn, S.

AU - Klaja, J.

AU - Kleines, H.

AU - Kłos, B.

AU - Kren, F.

AU - Krzemień, W.

AU - Kulessa, P.

AU - Kupść, A.

AU - Lalwani, K.

AU - Leupold, S.

AU - Lorentz, B.

AU - Magiera, A.

AU - Maier, R.

AU - Mariański, B.

AU - Marciniewski, P.

AU - Meißner, U. G.

AU - Mikirtychiants, M.

AU - Morsch, H. P.

AU - Moskal, P.

AU - Nandi, B. K.

AU - Niedźwiecki, S.

AU - Ohm, H.

AU - Passfeld, A.

AU - Pauly, C.

AU - Perez del Rio, E.

AU - Petri, T.

AU - Petukhov, Y.

AU - Piskunov, N.

AU - Pluciński, P.

AU - Podkopał, P.

AU - Povtoreyko, A.

AU - Prasuhn, D.

AU - Pricking, A.

AU - Pysz, K.

AU - Pyszniak, A.

AU - Rausmann, T.

AU - Redmer, C. F.

AU - Ritman, J.

AU - Rudy, Z.

AU - Sawant, S.

AU - Schadmand, S.

AU - Schmidt, A.

AU - Sefzick, T.

AU - Serdyuk, V.

AU - Siemaszko, M.

AU - Siudak, R.

AU - Skorodko, T.

AU - Skurzok, M.

AU - Smyrski, J.

AU - Sopov, V.

AU - Stassen, R.

AU - Stepaniak, J.

AU - Sterzenbach, G.

AU - Stockhorst, H.

AU - Stollenwerk, F.

AU - Ströher, H.

AU - Szczurek, A.

AU - Täschner, A.

AU - Terschlüsen, C.

AU - Tolba, T.

AU - Trzciński, A.

AU - Varma, R.

AU - Vlasov, P.

AU - Wagner, G. J.

AU - Weglorz, W.

AU - Winnemöller, A.

AU - Wirzba, A.

AU - Wolke, M.

AU - Wrońska, A.

AU - Wüstner, P.

AU - Wurm, P.

AU - Yuan, X.

AU - Yurev, L.

AU - Zabierowski, J.

AU - Zieliński, M. J.

AU - Zipper, W.

AU - Złomańczuk, J.

AU - Zuprański, P.

PY - 2012/1/20

Y1 - 2012/1/20

N2 - An exclusive measurement of the decay η→π +π -γ has been performed at the WASA facility at COSY. The η mesons were produced in the fusion reaction pd→He3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13960±140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of η→π +π -γ. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the π +π - system.

AB - An exclusive measurement of the decay η→π +π -γ has been performed at the WASA facility at COSY. The η mesons were produced in the fusion reaction pd→He3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13960±140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of η→π +π -γ. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the π +π - system.

KW - η meson

KW - Box anomaly

KW - Exclusive measurement

UR - http://www.scopus.com/inward/record.url?scp=84855333594&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2011.12.027

DO - 10.1016/j.physletb.2011.12.027

M3 - Article

AN - SCOPUS:84855333594

SN - 0370-2693

VL - 707

SP - 243

EP - 249

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 2