eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV

CELSIUS-WASA Collaboration; H. Petren; Chr. Bargholtz; M. Bashkanov; D. Bogoslavsky; H. Calen; H. Clement; L. Demiroers; C. Ekstrom; K. Fransson; G. Faldt; L. Geren; B. Hoistad; G. Ivanov; M. Jacewicz; E. Jiganov; T. Johansson; S. Keleta; O. Khakimova; I. Koch; F. Kren; S. Kullander; A. Kupsc; K. Lindberg; P. Marciniewski; B. Morosov; C. Pauly; Y. Petukhov; A. Povtorejko; K. Schonning; W. Scobel; T. Skorodko; J. Stepaniak; P-E Tegner; P. Thorngren Engblom; V. Tikhomirov; C. Wilkin; M. Wolke; J. Zabierowski; I. Zartova; J. Zlomanczuk

doi:10.1103/PhysRevC.82.055206

eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV

CELSIUS-WASA Collaboration, H. Petren^*, Chr. Bargholtz, M. Bashkanov, D. Bogoslavsky, H. Calen, H. Clement, L. Demiroers, C. Ekstrom, K. Fransson, G. Faldt, L. Geren, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, O. Khakimova, I. KochF. Kren, S. Kullander, A. Kupsc, K. Lindberg, P. Marciniewski, B. Morosov, C. Pauly, Y. Petukhov, A. Povtorejko, K. Schonning, W. Scobel, T. Skorodko, J. Stepaniak, P-E Tegner, P. Thorngren Engblom, V. Tikhomirov, C. Wilkin, M. Wolke, J. Zabierowski, I. Zartova, J. Zlomanczuk

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract / Description of output

The production of eta mesons in proton-proton collisions has been studied using the WASA detector at the CELSIUS storage ring at excess energies of Q = 40 MeV and Q = 72 MeV. The eta was detected through its 2 gamma decay in a near-4 pi electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9 x 10(4) and 9.3 x 10(4) events were found at Q = 40 MeV and Q = 72 MeV, respectively, with background contributions of less than 5%. A simple parametrization of the production cross section in terms of low partial waves was used to evaluate the acceptance corrections. Strong evidence was found for the influence of higher partial waves. The Dalitz plots show the presence of p waves in both the pp and the eta {pp} systems and the angular distributions of the eta in the center-of-mass frame suggest the influence of d-wave eta mesons.

Original language	English
Article number	055206
Number of pages	11
Journal	Physical Review C
Volume	82
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.82.055206
Publication status	Published - 30 Nov 2010

Keywords / Materials (for Non-textual outputs)

NUCLEON-NUCLEON COLLISIONS
NEAR-THRESHOLD
PP->PP-ETA REACTION

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10.1103/PhysRevC.82.055206

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CELSIUS-WASA Collaboration, Petren, H., Bargholtz, C., Bashkanov, M., Bogoslavsky, D., Calen, H., Clement, H., Demiroers, L., Ekstrom, C., Fransson, K., Faldt, G., Geren, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., ... Zlomanczuk, J. (2010). eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV. Physical Review C, 82(5), Article 055206. https://doi.org/10.1103/PhysRevC.82.055206

@article{9d8f043ba6ca4c968026ce06e665b303,

title = "eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV",

abstract = "The production of eta mesons in proton-proton collisions has been studied using the WASA detector at the CELSIUS storage ring at excess energies of Q = 40 MeV and Q = 72 MeV. The eta was detected through its 2 gamma decay in a near-4 pi electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9 x 10(4) and 9.3 x 10(4) events were found at Q = 40 MeV and Q = 72 MeV, respectively, with background contributions of less than 5%. A simple parametrization of the production cross section in terms of low partial waves was used to evaluate the acceptance corrections. Strong evidence was found for the influence of higher partial waves. The Dalitz plots show the presence of p waves in both the pp and the eta {pp} systems and the angular distributions of the eta in the center-of-mass frame suggest the influence of d-wave eta mesons.",

keywords = "NUCLEON-NUCLEON COLLISIONS, NEAR-THRESHOLD, PP->PP-ETA REACTION",

author = "{CELSIUS-WASA Collaboration} and H. Petren and Chr. Bargholtz and M. Bashkanov and D. Bogoslavsky and H. Calen and H. Clement and L. Demiroers and C. Ekstrom and K. Fransson and G. Faldt and L. Geren and B. Hoistad and G. Ivanov and M. Jacewicz and E. Jiganov and T. Johansson and S. Keleta and O. Khakimova and I. Koch and F. Kren and S. Kullander and A. Kupsc and K. Lindberg and P. Marciniewski and B. Morosov and C. Pauly and Y. Petukhov and A. Povtorejko and K. Schonning and W. Scobel and T. Skorodko and J. Stepaniak and P-E Tegner and Engblom, {P. Thorngren} and V. Tikhomirov and C. Wilkin and M. Wolke and J. Zabierowski and I. Zartova and J. Zlomanczuk",

year = "2010",

month = nov,

day = "30",

doi = "10.1103/PhysRevC.82.055206",

language = "English",

volume = "82",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "5",

}

CELSIUS-WASA Collaboration, Petren, H, Bargholtz, C, Bashkanov, M, Bogoslavsky, D, Calen, H, Clement, H, Demiroers, L, Ekstrom, C, Fransson, K, Faldt, G, Geren, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Keleta, S, Khakimova, O, Koch, I, Kren, F, Kullander, S, Kupsc, A, Lindberg, K, Marciniewski, P, Morosov, B, Pauly, C, Petukhov, Y, Povtorejko, A, Schonning, K, Scobel, W, Skorodko, T, Stepaniak, J, Tegner, P-E, Engblom, PT, Tikhomirov, V, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I & Zlomanczuk, J 2010, 'eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV', Physical Review C, vol. 82, no. 5, 055206. https://doi.org/10.1103/PhysRevC.82.055206

TY - JOUR

T1 - eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV

AU - CELSIUS-WASA Collaboration

AU - Petren, H.

AU - Bargholtz, Chr.

AU - Bashkanov, M.

AU - Bogoslavsky, D.

AU - Calen, H.

AU - Clement, H.

AU - Demiroers, L.

AU - Ekstrom, C.

AU - Fransson, K.

AU - Faldt, G.

AU - Geren, L.

AU - Hoistad, B.

AU - Ivanov, G.

AU - Jacewicz, M.

AU - Jiganov, E.

AU - Johansson, T.

AU - Keleta, S.

AU - Khakimova, O.

AU - Koch, I.

AU - Kren, F.

AU - Kullander, S.

AU - Kupsc, A.

AU - Lindberg, K.

AU - Marciniewski, P.

AU - Morosov, B.

AU - Pauly, C.

AU - Petukhov, Y.

AU - Povtorejko, A.

AU - Schonning, K.

AU - Scobel, W.

AU - Skorodko, T.

AU - Stepaniak, J.

AU - Tegner, P-E

AU - Engblom, P. Thorngren

AU - Tikhomirov, V.

AU - Wilkin, C.

AU - Wolke, M.

AU - Zabierowski, J.

AU - Zartova, I.

AU - Zlomanczuk, J.

PY - 2010/11/30

Y1 - 2010/11/30

N2 - The production of eta mesons in proton-proton collisions has been studied using the WASA detector at the CELSIUS storage ring at excess energies of Q = 40 MeV and Q = 72 MeV. The eta was detected through its 2 gamma decay in a near-4 pi electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9 x 10(4) and 9.3 x 10(4) events were found at Q = 40 MeV and Q = 72 MeV, respectively, with background contributions of less than 5%. A simple parametrization of the production cross section in terms of low partial waves was used to evaluate the acceptance corrections. Strong evidence was found for the influence of higher partial waves. The Dalitz plots show the presence of p waves in both the pp and the eta {pp} systems and the angular distributions of the eta in the center-of-mass frame suggest the influence of d-wave eta mesons.

AB - The production of eta mesons in proton-proton collisions has been studied using the WASA detector at the CELSIUS storage ring at excess energies of Q = 40 MeV and Q = 72 MeV. The eta was detected through its 2 gamma decay in a near-4 pi electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9 x 10(4) and 9.3 x 10(4) events were found at Q = 40 MeV and Q = 72 MeV, respectively, with background contributions of less than 5%. A simple parametrization of the production cross section in terms of low partial waves was used to evaluate the acceptance corrections. Strong evidence was found for the influence of higher partial waves. The Dalitz plots show the presence of p waves in both the pp and the eta {pp} systems and the angular distributions of the eta in the center-of-mass frame suggest the influence of d-wave eta mesons.

KW - NUCLEON-NUCLEON COLLISIONS

KW - NEAR-THRESHOLD

KW - PP->PP-ETA REACTION

U2 - 10.1103/PhysRevC.82.055206

DO - 10.1103/PhysRevC.82.055206

M3 - Article

SN - 0556-2813

VL - 82

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 055206

ER -

eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV

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Keywords / Materials (for Non-textual outputs)

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