Search for eta-mesic He-4 with the WASA-at-COSY detector

WASA COSY Collaboration; P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; T. Bednarski; F. S. Bergmann; M. Berlowski; H. Bhatt; M. Buescher; H. Calen; H. Clement; D. Coderre; E. Czerwinski; K. Demmich; E. Doroshkevich; R. Engels; W. Erven; W. Eyrich; P. Fedorets; K. Foehl; K. Fransson; F. Goldenbaum; P. Goslawski; A. Goswami; K. Grigoryev; C. -O. Gullstrom; F. Hauenstein; L. Heijkenskjold; V. Hejny; F. Hinterberger; M. Hodana; B. Hoistad; A. Jany; B. R. Jany; L. Jarczyk; T. Johansson; B. Kamys; G. Kemmerling; F. A. Khan; A. Khoukaz; S. Kistryn; J. Klaja; H. Kleines; B. Klos; M. Krapp; W. Krzemien; P. Kulessa; A. Kupsc; K. Lalwani; L. Li

doi:10.1103/PhysRevC.87.035204

Search for eta-mesic He-4 with the WASA-at-COSY detector

WASA COSY Collaboration, P. Adlarson^*, W. Augustyniak, W. Bardan, M. Bashkanov, T. Bednarski, F. S. Bergmann, M. Berlowski, H. Bhatt, M. Buescher, H. Calen, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. FedoretsK. Foehl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, C. -O. Gullstrom, F. Hauenstein, L. Heijkenskjold, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F. A. Khan, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Klos, M. Krapp, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani, L. Li

^*Corresponding author for this work

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

Abstract

An exclusive measurement of the excitation function for the dd -> (3)Hep pi(-) reaction was performed at the Cooler Synchrotron COSY-Julich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the eta-meson production in the dd -> He-4 eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the He-4-eta system varied from -51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd -> (3)Hen reaction. The shape of the excitation function for the dd -> (3)Hep pi(-) reaction was examined. No signal of the He-4-eta bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd -> (He-4-eta)(bound) -> (3)Hep pi(-) was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively. DOI: 10.1103/PhysRevC.87.035204

Original language	English
Article number	035204
Number of pages	7
Journal	Physical Review C
Volume	87
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.87.035204
Publication status	Published - 8 Mar 2013

Keywords

BOUND-STATES
NUCLEI
PHOTOPRODUCTION
MESONS

Access to Document

10.1103/PhysRevC.87.035204

Cite this

WASA COSY Collaboration, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calen, H., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., ... Li, L. (2013). Search for eta-mesic He-4 with the WASA-at-COSY detector. Physical Review C, 87(3), [035204]. https://doi.org/10.1103/PhysRevC.87.035204

@article{2b8e1bbf479a4617a434928f65161d61,

title = "Search for eta-mesic He-4 with the WASA-at-COSY detector",

abstract = "An exclusive measurement of the excitation function for the dd -> (3)Hep pi(-) reaction was performed at the Cooler Synchrotron COSY-Julich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the eta-meson production in the dd -> He-4 eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the He-4-eta system varied from -51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd -> (3)Hen reaction. The shape of the excitation function for the dd -> (3)Hep pi(-) reaction was examined. No signal of the He-4-eta bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd -> (He-4-eta)(bound) -> (3)Hep pi(-) was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively. DOI: 10.1103/PhysRevC.87.035204",

keywords = "BOUND-STATES, NUCLEI, PHOTOPRODUCTION, MESONS",

author = "{WASA COSY Collaboration} and P. Adlarson and W. Augustyniak and W. Bardan and M. Bashkanov and T. Bednarski and Bergmann, {F. S.} and M. Berlowski and H. Bhatt and M. Buescher and H. Calen and H. Clement and D. Coderre and E. Czerwinski and K. Demmich and E. Doroshkevich and R. Engels and W. Erven and W. Eyrich and P. Fedorets and K. Foehl and K. Fransson and F. Goldenbaum and P. Goslawski and A. Goswami and K. Grigoryev and Gullstrom, {C. -O.} and F. Hauenstein and L. Heijkenskjold and V. Hejny and F. Hinterberger and M. Hodana and B. Hoistad and A. Jany and Jany, {B. R.} and L. Jarczyk and T. Johansson and B. Kamys and G. Kemmerling and Khan, {F. A.} and A. Khoukaz and S. Kistryn and J. Klaja and H. Kleines and B. Klos and M. Krapp and W. Krzemien and P. Kulessa and A. Kupsc and K. Lalwani and L. Li",

year = "2013",

month = mar,

day = "8",

doi = "10.1103/PhysRevC.87.035204",

language = "English",

volume = "87",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "3",

}

WASA COSY Collaboration, Adlarson, P, Augustyniak, W, Bardan, W, Bashkanov, M, Bednarski, T, Bergmann, FS, Berlowski, M, Bhatt, H, Buescher, M, Calen, H, Clement, H, Coderre, D, Czerwinski, E, Demmich, K, Doroshkevich, E, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Foehl, K, Fransson, K, Goldenbaum, F, Goslawski, P, Goswami, A, Grigoryev, K, Gullstrom, C-O, Hauenstein, F, Heijkenskjold, L, Hejny, V, Hinterberger, F, Hodana, M, Hoistad, B, Jany, A, Jany, BR, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Khan, FA, Khoukaz, A, Kistryn, S, Klaja, J, Kleines, H, Klos, B, Krapp, M, Krzemien, W, Kulessa, P, Kupsc, A, Lalwani, K & Li, L 2013, 'Search for eta-mesic He-4 with the WASA-at-COSY detector', Physical Review C, vol. 87, no. 3, 035204. https://doi.org/10.1103/PhysRevC.87.035204

TY - JOUR

T1 - Search for eta-mesic He-4 with the WASA-at-COSY detector

AU - WASA COSY Collaboration

AU - Adlarson, P.

AU - Augustyniak, W.

AU - Bardan, W.

AU - Bashkanov, M.

AU - Bednarski, T.

AU - Bergmann, F. S.

AU - Berlowski, M.

AU - Bhatt, H.

AU - Buescher, M.

AU - Calen, H.

AU - Clement, H.

AU - Coderre, D.

AU - Czerwinski, E.

AU - Demmich, K.

AU - Doroshkevich, E.

AU - Engels, R.

AU - Erven, W.

AU - Eyrich, W.

AU - Fedorets, P.

AU - Foehl, K.

AU - Fransson, K.

AU - Goldenbaum, F.

AU - Goslawski, P.

AU - Goswami, A.

AU - Grigoryev, K.

AU - Gullstrom, C. -O.

AU - Hauenstein, F.

AU - Heijkenskjold, L.

AU - Hejny, V.

AU - Hinterberger, F.

AU - Hodana, M.

AU - Hoistad, B.

AU - Jany, A.

AU - Jany, B. R.

AU - Jarczyk, L.

AU - Johansson, T.

AU - Kamys, B.

AU - Kemmerling, G.

AU - Khan, F. A.

AU - Khoukaz, A.

AU - Kistryn, S.

AU - Klaja, J.

AU - Kleines, H.

AU - Klos, B.

AU - Krapp, M.

AU - Krzemien, W.

AU - Kulessa, P.

AU - Kupsc, A.

AU - Lalwani, K.

AU - Li, L.

PY - 2013/3/8

Y1 - 2013/3/8

N2 - An exclusive measurement of the excitation function for the dd -> (3)Hep pi(-) reaction was performed at the Cooler Synchrotron COSY-Julich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the eta-meson production in the dd -> He-4 eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the He-4-eta system varied from -51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd -> (3)Hen reaction. The shape of the excitation function for the dd -> (3)Hep pi(-) reaction was examined. No signal of the He-4-eta bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd -> (He-4-eta)(bound) -> (3)Hep pi(-) was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively. DOI: 10.1103/PhysRevC.87.035204

AB - An exclusive measurement of the excitation function for the dd -> (3)Hep pi(-) reaction was performed at the Cooler Synchrotron COSY-Julich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the eta-meson production in the dd -> He-4 eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the He-4-eta system varied from -51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd -> (3)Hen reaction. The shape of the excitation function for the dd -> (3)Hep pi(-) reaction was examined. No signal of the He-4-eta bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd -> (He-4-eta)(bound) -> (3)Hep pi(-) was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively. DOI: 10.1103/PhysRevC.87.035204

KW - BOUND-STATES

KW - NUCLEI

KW - PHOTOPRODUCTION

KW - MESONS

U2 - 10.1103/PhysRevC.87.035204

DO - 10.1103/PhysRevC.87.035204

M3 - Article

VL - 87

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 3

M1 - 035204

ER -

Search for eta-mesic He-4 with the WASA-at-COSY detector

Abstract

Keywords

Access to Document

Fingerprint

Cite this