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

H. Petrén; Chr Bargholtz; M. Bashkanov; D. Bogoslavsky; H. Calén; H. Clement; L. Demirörs; C. Ekström; K. Fransson; G. Fäldt; L. Gerén; B. Höistad; G. Ivanov; M. Jacewicz; E. Jiganov; T. Johansson; S. Keleta; O. Khakimova; I. Koch; F. Kren; S. Kullander; A. Kupć; K. Lindberg; P. Marciniewski; B. Morosov; C. Pauly; Y. Petukhov; A. Povtorejko; K. Schönning; W. Scobel; T. Skorodko; J. Stepaniak; P. E. Tegnér; P. Thörngren Engblom; V. Tikhomirov; C. Wilkin; M. Wolke; J. Zabierowski; I. Zartova; J. Złomańczuk

doi:10.1103/PhysRevC.82.055206

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

H. Petrén^*, Chr Bargholtz, M. Bashkanov, D. Bogoslavsky, H. Calén, H. Clement, L. Demirörs, C. Ekström, K. Fransson, G. Fäldt, L. Gerén, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, O. Khakimova, I. Koch, F. KrenS. Kullander, A. Kupć, K. Lindberg, P. Marciniewski, B. Morosov, C. Pauly, Y. Petukhov, A. Povtorejko, K. Schönning, W. Scobel, T. Skorodko, J. Stepaniak, P. E. Tegnér, P. Thörngren Engblom, V. Tikhomirov, C. Wilkin, M. Wolke, J. Zabierowski, I. Zartova, J. Złomańczuk

^*Corresponding author for this work

Physics

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

Abstract

The production of η 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 η was detected through its 2γ decay in a near-4π electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9×104 and 9.3×104 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 η{pp} systems and the angular distributions of the η in the center-of-mass frame suggest the influence of d-wave η mesons.

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

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Petrén, H., Bargholtz, C., Bashkanov, M., Bogoslavsky, D., Calén, H., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Fäldt, G., Gerén, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Koch, I., ... Złomańczuk, J. (2010). η-meson production in proton-proton collisions at excess energies of 40 and 72 MeV. Physical Review C - Nuclear Physics, 82(5), Article 055206. https://doi.org/10.1103/PhysRevC.82.055206

@article{7f1f68b2a8c1401cbcc1c193415ae0ce,

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

abstract = "The production of η 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 η was detected through its 2γ decay in a near-4π electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9×104 and 9.3×104 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 η{pp} systems and the angular distributions of the η in the center-of-mass frame suggest the influence of d-wave η mesons.",

author = "H. Petr{\'e}n and Chr Bargholtz and M. Bashkanov and D. Bogoslavsky and H. Cal{\'e}n and H. Clement and L. Demir{\"o}rs and C. Ekstr{\"o}m and K. Fransson and G. F{\"a}ldt and L. Ger{\'e}n and B. H{\"o}istad 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. Kup{\'c} and K. Lindberg and P. Marciniewski and B. Morosov and C. Pauly and Y. Petukhov and A. Povtorejko and K. Sch{\"o}nning and W. Scobel and T. Skorodko and J. Stepaniak and Tegn{\'e}r, {P. E.} and {Th{\"o}rngren Engblom}, P. and V. Tikhomirov and C. Wilkin and M. Wolke and J. Zabierowski and I. Zartova and J. Z{\l}oma{\'n}czuk",

year = "2010",

month = nov,

day = "30",

doi = "10.1103/PhysRevC.82.055206",

language = "English",

volume = "82",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "5",

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Petrén, H, Bargholtz, C, Bashkanov, M, Bogoslavsky, D, Calén, H, Clement, H, Demirörs, L, Ekström, C, Fransson, K, Fäldt, G, Gerén, L, Höistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Keleta, S, Khakimova, O, Koch, I, Kren, F, Kullander, S, Kupć, A, Lindberg, K, Marciniewski, P, Morosov, B, Pauly, C, Petukhov, Y, Povtorejko, A, Schönning, K, Scobel, W, Skorodko, T, Stepaniak, J, Tegnér, PE, Thörngren Engblom, P, Tikhomirov, V, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I & Złomańczuk, J 2010, 'η-meson production in proton-proton collisions at excess energies of 40 and 72 MeV', Physical Review C - Nuclear Physics, vol. 82, no. 5, 055206. https://doi.org/10.1103/PhysRevC.82.055206

TY - JOUR

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

AU - Petrén, H.

AU - Bargholtz, Chr

AU - Bashkanov, M.

AU - Bogoslavsky, D.

AU - Calén, H.

AU - Clement, H.

AU - Demirörs, L.

AU - Ekström, C.

AU - Fransson, K.

AU - Fäldt, G.

AU - Gerén, L.

AU - Höistad, 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 - Kupć, A.

AU - Lindberg, K.

AU - Marciniewski, P.

AU - Morosov, B.

AU - Pauly, C.

AU - Petukhov, Y.

AU - Povtorejko, A.

AU - Schönning, K.

AU - Scobel, W.

AU - Skorodko, T.

AU - Stepaniak, J.

AU - Tegnér, P. E.

AU - Thörngren Engblom, P.

AU - Tikhomirov, V.

AU - Wilkin, C.

AU - Wolke, M.

AU - Zabierowski, J.

AU - Zartova, I.

AU - Złomańczuk, J.

PY - 2010/11/30

Y1 - 2010/11/30

N2 - The production of η 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 η was detected through its 2γ decay in a near-4π electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9×104 and 9.3×104 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 η{pp} systems and the angular distributions of the η in the center-of-mass frame suggest the influence of d-wave η mesons.

AB - The production of η 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 η was detected through its 2γ decay in a near-4π electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9×104 and 9.3×104 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 η{pp} systems and the angular distributions of the η in the center-of-mass frame suggest the influence of d-wave η mesons.

UR - http://www.scopus.com/inward/record.url?scp=79251515497&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.82.055206

DO - 10.1103/PhysRevC.82.055206

M3 - Article

AN - SCOPUS:79251515497

SN - 0556-2813

VL - 82

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

M1 - 055206

ER -

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

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