Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements

M. Bashkanov; O. Khakimova; T. Skorodko; C. Bargholtz; D. Bogoslowsky; H. Calen; F. Cappellaro; H. Clement; C. Ekstroem; K. Fransson; L. Geren; L. Gustafsson; B. Hoeistad; G. Ivanov; M. Jacewicz; E. Jiganov; T. Johansson; M. M. Kaskulov; S. Keleta; I. Koch; F. Kren; S. Kullander; A. Kupsc; A. Kuznetsov; K. Lindberg; P. Marciniewski; R. Meier; B. Morosov; W. Oelert; C. Pauly; Y. Petukhov; A. Povtoreyko; R. J. M. Y. Ruber; A. Schwick; W. Scobel; R. Shafigullin; B. Shwartz; V. Sopov; J. Stepaniak; P. -E. Tegner; V. Tchernyshev; P. Thoerngren-Engblom; V. Tikhomirov; A. Turowiecki; G. J. Wagner; M. Wolke; A. Yamamoto; J. Zabierowskin; I. Zartova; J. Z. Loman

Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements

M. Bashkanov^*, O. Khakimova, T. Skorodko, C. Bargholtz, D. Bogoslowsky, H. Calen, F. Cappellaro, H. Clement, C. Ekstroem, K. Fransson, L. Geren, L. Gustafsson, B. Hoeistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, M. M. Kaskulov, S. Keleta, I. KochF. Kren, S. Kullander, A. Kupsc, A. Kuznetsov, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, Y. Petukhov, A. Povtoreyko, R. J. M. Y. Ruber, A. Schwick, W. Scobel, R. Shafigullin, B. Shwartz, V. Sopov, J. Stepaniak, P. -E. Tegner, V. Tchernyshev, P. Thoerngren-Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowskin, I. Zartova, J. Z. Loman

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract

The ABC effect - a puzzling threshold enhancement in the pi pi invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge pi pi threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a sigma-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of pi pi pi rather than of pi pi nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two. particles created in this process is of crucial importance.

Original language	English
Pages (from-to)	625-628
Number of pages	4
Journal	International Journal of Modern Physics A
Volume	22
Issue number	2-3
Publication status	Published - 30 Jan 2007
Event	9th International Workshop on Meson Production, Properties and Internation - Cracow, Poland Duration: 9 Jun 2006 → 13 Jun 2006

Keywords

ABC effect
sigma channel enhancement
Delta Delta interaction
medium effects

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Bashkanov, M., Khakimova, O., Skorodko, T., Bargholtz, C., Bogoslowsky, D., Calen, H., Cappellaro, F., Clement, H., Ekstroem, C., Fransson, K., Geren, L., Gustafsson, L., Hoeistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Kaskulov, M. M., Keleta, S., ... Loman, J. Z. (2007). Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements. International Journal of Modern Physics A, 22(2-3), 625-628. http://Low-mass pi pi enhancement in baryonic pi pi production

Bashkanov, M. ; Khakimova, O. ; Skorodko, T. ; Bargholtz, C. ; Bogoslowsky, D. ; Calen, H. ; Cappellaro, F. ; Clement, H. ; Ekstroem, C. ; Fransson, K. ; Geren, L. ; Gustafsson, L. ; Hoeistad, B. ; Ivanov, G. ; Jacewicz, M. ; Jiganov, E. ; Johansson, T. ; Kaskulov, M. M. ; Keleta, S. ; Koch, I. ; Kren, F. ; Kullander, S. ; Kupsc, A. ; Kuznetsov, A. ; Lindberg, K. ; Marciniewski, P. ; Meier, R. ; Morosov, B. ; Oelert, W. ; Pauly, C. ; Petukhov, Y. ; Povtoreyko, A. ; Ruber, R. J. M. Y. ; Schwick, A. ; Scobel, W. ; Shafigullin, R. ; Shwartz, B. ; Sopov, V. ; Stepaniak, J. ; Tegner, P. -E. ; Tchernyshev, V. ; Thoerngren-Engblom, P. ; Tikhomirov, V. ; Turowiecki, A. ; Wagner, G. J. ; Wolke, M. ; Yamamoto, A. ; Zabierowskin, J. ; Zartova, I. ; Loman, J. Z. / Low-mass pi pi enhancement in baryonic pi pi production : ABC effect revised by exclusive measurements. In: International Journal of Modern Physics A. 2007 ; Vol. 22, No. 2-3. pp. 625-628.

@article{b3dcc7a21a9744b1bb0cac170eeb4063,

title = "Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements",

abstract = "The ABC effect - a puzzling threshold enhancement in the pi pi invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge pi pi threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a sigma-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of pi pi pi rather than of pi pi nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two. particles created in this process is of crucial importance.",

keywords = "ABC effect, sigma channel enhancement, Delta Delta interaction, medium effects",

author = "M. Bashkanov and O. Khakimova and T. Skorodko and C. Bargholtz and D. Bogoslowsky and H. Calen and F. Cappellaro and H. Clement and C. Ekstroem and K. Fransson and L. Geren and L. Gustafsson and B. Hoeistad and G. Ivanov and M. Jacewicz and E. Jiganov and T. Johansson and Kaskulov, {M. M.} and S. Keleta and I. Koch and F. Kren and S. Kullander and A. Kupsc and A. Kuznetsov and K. Lindberg and P. Marciniewski and R. Meier and B. Morosov and W. Oelert and C. Pauly and Y. Petukhov and A. Povtoreyko and Ruber, {R. J. M. Y.} and A. Schwick and W. Scobel and R. Shafigullin and B. Shwartz and V. Sopov and J. Stepaniak and Tegner, {P. -E.} and V. Tchernyshev and P. Thoerngren-Engblom and V. Tikhomirov and A. Turowiecki and Wagner, {G. J.} and M. Wolke and A. Yamamoto and J. Zabierowskin and I. Zartova and Loman, {J. Z.}",

year = "2007",

month = jan,

day = "30",

language = "English",

volume = "22",

pages = "625--628",

journal = "International Journal of Modern Physics A",

issn = "0217-751X",

publisher = "WORLD SCIENTIFIC PUBL CO PTE LTD",

number = "2-3",

note = "9th International Workshop on Meson Production, Properties and Internation ; Conference date: 09-06-2006 Through 13-06-2006",

}

Bashkanov, M, Khakimova, O, Skorodko, T, Bargholtz, C, Bogoslowsky, D, Calen, H, Cappellaro, F, Clement, H, Ekstroem, C, Fransson, K, Geren, L, Gustafsson, L, Hoeistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Kaskulov, MM, Keleta, S, Koch, I, Kren, F, Kullander, S, Kupsc, A, Kuznetsov, A, Lindberg, K, Marciniewski, P, Meier, R, Morosov, B, Oelert, W, Pauly, C, Petukhov, Y, Povtoreyko, A, Ruber, RJMY, Schwick, A, Scobel, W, Shafigullin, R, Shwartz, B, Sopov, V, Stepaniak, J, Tegner, P-E, Tchernyshev, V, Thoerngren-Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, GJ, Wolke, M, Yamamoto, A, Zabierowskin, J, Zartova, I & Loman, JZ 2007, 'Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements', International Journal of Modern Physics A, vol. 22, no. 2-3, pp. 625-628. <http://Low-mass pi pi enhancement in baryonic pi pi production>

Low-mass pi pi enhancement in baryonic pi pi production : ABC effect revised by exclusive measurements. / Bashkanov, M.; Khakimova, O.; Skorodko, T.; Bargholtz, C.; Bogoslowsky, D.; Calen, H.; Cappellaro, F.; Clement, H.; Ekstroem, C.; Fransson, K.; Geren, L.; Gustafsson, L.; Hoeistad, B.; Ivanov, G.; Jacewicz, M.; Jiganov, E.; Johansson, T.; Kaskulov, M. M.; Keleta, S.; Koch, I.; Kren, F.; Kullander, S.; Kupsc, A.; Kuznetsov, A.; Lindberg, K.; Marciniewski, P.; Meier, R.; Morosov, B.; Oelert, W.; Pauly, C.; Petukhov, Y.; Povtoreyko, A.; Ruber, R. J. M. Y.; Schwick, A.; Scobel, W.; Shafigullin, R.; Shwartz, B.; Sopov, V.; Stepaniak, J.; Tegner, P. -E.; Tchernyshev, V.; Thoerngren-Engblom, P.; Tikhomirov, V.; Turowiecki, A.; Wagner, G. J.; Wolke, M.; Yamamoto, A.; Zabierowskin, J.; Zartova, I.; Loman, J. Z.

In: International Journal of Modern Physics A, Vol. 22, No. 2-3, 30.01.2007, p. 625-628.

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

TY - JOUR

T1 - Low-mass pi pi enhancement in baryonic pi pi production

T2 - 9th International Workshop on Meson Production, Properties and Internation

AU - Bashkanov, M.

AU - Khakimova, O.

AU - Skorodko, T.

AU - Bargholtz, C.

AU - Bogoslowsky, D.

AU - Calen, H.

AU - Cappellaro, F.

AU - Clement, H.

AU - Ekstroem, C.

AU - Fransson, K.

AU - Geren, L.

AU - Gustafsson, L.

AU - Hoeistad, B.

AU - Ivanov, G.

AU - Jacewicz, M.

AU - Jiganov, E.

AU - Johansson, T.

AU - Kaskulov, M. M.

AU - Keleta, S.

AU - Koch, I.

AU - Kren, F.

AU - Kullander, S.

AU - Kupsc, A.

AU - Kuznetsov, A.

AU - Lindberg, K.

AU - Marciniewski, P.

AU - Meier, R.

AU - Morosov, B.

AU - Oelert, W.

AU - Pauly, C.

AU - Petukhov, Y.

AU - Povtoreyko, A.

AU - Ruber, R. J. M. Y.

AU - Schwick, A.

AU - Scobel, W.

AU - Shafigullin, R.

AU - Shwartz, B.

AU - Sopov, V.

AU - Stepaniak, J.

AU - Tegner, P. -E.

AU - Tchernyshev, V.

AU - Thoerngren-Engblom, P.

AU - Tikhomirov, V.

AU - Turowiecki, A.

AU - Wagner, G. J.

AU - Wolke, M.

AU - Yamamoto, A.

AU - Zabierowskin, J.

AU - Zartova, I.

AU - Loman, J. Z.

PY - 2007/1/30

Y1 - 2007/1/30

N2 - The ABC effect - a puzzling threshold enhancement in the pi pi invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge pi pi threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a sigma-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of pi pi pi rather than of pi pi nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two. particles created in this process is of crucial importance.

AB - The ABC effect - a puzzling threshold enhancement in the pi pi invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge pi pi threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a sigma-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of pi pi pi rather than of pi pi nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two. particles created in this process is of crucial importance.

KW - ABC effect

KW - sigma channel enhancement

KW - Delta Delta interaction

KW - medium effects

M3 - Article

VL - 22

SP - 625

EP - 628

JO - International Journal of Modern Physics A

JF - International Journal of Modern Physics A

SN - 0217-751X

IS - 2-3

Y2 - 9 June 2006 through 13 June 2006

ER -

Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements

Abstract

Keywords

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