Observation of a new ηπ0π0 resonance at 1900 MeV/c2 in two-photon scattering

K. Karch; D. Antreasyan; H. W. Bartels; D. Besset; Ch Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F. H. Heinsius; R. Hofstadter; J. Irion; Z. Jakubowski; H. Janssen; S. Keh; T. Kiel; H. Kilian; I. Kirkbride; T. Kloiber; M. Kobel; W. Koch; A. C. König; K. Königsmann; R. W. Kraemer; S. Krüger; G. Landi; R. Lee; S. Leffler; R. Lekebusch; A. M. Litke; W. Lockman; S. Lowe; B. Lurz; D. Marlow; H. Marsiske; W. Maschmann; P. McBride; F. Messing; W. J. Metzger; H. Meyer; B. Monteleoni; B. Muryn; R. Nernst; B. Niczyporuk; G. Nowak; C. Peck; P. G. Pelfer; B. Pollock; F. C. Porter; D. Prindle; P. Ratoff; M. Reidenbach; B. Renger; C. Rippich; M. Scheer; P. Schmitt; J. Schotanus; J. Schütte; A. Schwarz; D. Sievers; T. Skwarnicki; V. Stock; K. Strauch; U. Strohbusch; J. Tompkins; H. J. Trost; B. van Uitert; R. T. Van de Walle; H. Vogel; A. Voigt; U. Volland; K. Wachs; K. Wacker; W. Walk; H. Wegener; D. A. Williams; P. Zschorsch

doi:10.1016/0370-2693(90)91268-G

Observation of a new ηπ⁰π⁰ resonance at 1900 MeV/c² in two-photon scattering

K. Karch, D. Antreasyan, H. W. Bartels, D. Besset, Ch Bieler, J. K. Bienlein, A. Bizzeti, E. D. Bloom, I. Brock, K. Brockmüller, R. Cabenda, A. Cartacci, M. Cavalli-Sforza, R. Clare, A. Compagnucci, G. Conforto, S. Cooper, R. Cowan, D. Coyne, A. EnglerK. Fairfield, G. Folger, A. Fridman, J. Gaiser, D. Gelphman, G. Glaser, G. Godfrey, K. Graaf, F. H. Heimlich, F. H. Heinsius, R. Hofstadter, J. Irion, Z. Jakubowski, H. Janssen, S. Keh, T. Kiel, H. Kilian, I. Kirkbride, T. Kloiber, M. Kobel, W. Koch, A. C. König, K. Königsmann, R. W. Kraemer, S. Krüger, G. Landi, R. Lee, S. Leffler, R. Lekebusch, A. M. Litke, W. Lockman, S. Lowe, B. Lurz, D. Marlow, H. Marsiske, W. Maschmann, P. McBride, F. Messing, W. J. Metzger, H. Meyer, B. Monteleoni, B. Muryn, R. Nernst, B. Niczyporuk, G. Nowak, C. Peck, P. G. Pelfer, B. Pollock, F. C. Porter, D. Prindle, P. Ratoff, M. Reidenbach, B. Renger, C. Rippich, M. Scheer, P. Schmitt, J. Schotanus, J. Schütte, A. Schwarz, D. Sievers, T. Skwarnicki, V. Stock, K. Strauch, U. Strohbusch, J. Tompkins, H. J. Trost, B. van Uitert, R. T. Van de Walle, H. Vogel, A. Voigt, U. Volland, K. Wachs, K. Wacker, W. Walk, H. Wegener, D. A. Williams, P. Zschorsch

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Abstract

Using the Crystal Ball detector at the DORIS II e⁺e^- storage ring, we measure the ηπ⁰π⁰ mass spectrum in the reaction e⁺e^-→e⁺e^-ηπ⁰π⁰→e⁺e^-6γ from the ηπ⁰π⁰ threshold to about 2500 MeV/c². The spectrum is dominated by the η′, for which we determine Γ_γγ(η′)BR(η'→6γ)=0 .36±0.02±0.03 keV. In addition, we observe an enhancement in the cross section near 1900 MeV/c² which we attribute to the two-photon production of a new resonance X(1900). The angular distributions and the invariant mass distribution of the ηπ⁰ subsystem are consistent with those expected for the hypothetical η₂ meson with J^PC=2^-+. For this J^P assignment the resonance parameters are M(X) = 1876 ±35±50 MeV/c², Γ_tot(X)=228±90±34 MeV/c² and Γ_γγ(X)BR(X→ηππ) = 0.9±0.2±0.3 keV.

Original language	English (US)
Pages (from-to)	353-358
Number of pages	6
Journal	Physics Letters B
Volume	249
Issue number	2
DOIs	https://doi.org/10.1016/0370-2693(90)91268-G
State	Published - Oct 18 1990
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0370-2693(90)91268-G

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Karch, K., Antreasyan, D., Bartels, H. W., Besset, D., Bieler, C., Bienlein, J. K., Bizzeti, A., Bloom, E. D., Brock, I., Brockmüller, K., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., ... Zschorsch, P. (1990). Observation of a new ηπ⁰π⁰ resonance at 1900 MeV/c² in two-photon scattering. Physics Letters B, 249(2), 353-358. https://doi.org/10.1016/0370-2693(90)91268-G

Karch, K, Antreasyan, D, Bartels, HW, Besset, D, Bieler, C, Bienlein, JK, Bizzeti, A, Bloom, ED, Brock, I, Brockmüller, K, Cabenda, R, Cartacci, A, Cavalli-Sforza, M, Clare, R, Compagnucci, A, Conforto, G, Cooper, S, Cowan, R, Coyne, D, Engler, A, Fairfield, K, Folger, G, Fridman, A, Gaiser, J, Gelphman, D, Glaser, G, Godfrey, G, Graaf, K, Heimlich, FH, Heinsius, FH, Hofstadter, R, Irion, J, Jakubowski, Z, Janssen, H, Keh, S, Kiel, T, Kilian, H, Kirkbride, I, Kloiber, T, Kobel, M, Koch, W, König, AC, Königsmann, K, Kraemer, RW, Krüger, S, Landi, G, Lee, R, Leffler, S, Lekebusch, R, Litke, AM, Lockman, W, Lowe, S, Lurz, B, Marlow, D, Marsiske, H, Maschmann, W, McBride, P, Messing, F, Metzger, WJ, Meyer, H, Monteleoni, B, Muryn, B, Nernst, R, Niczyporuk, B, Nowak, G, Peck, C, Pelfer, PG, Pollock, B, Porter, FC, Prindle, D, Ratoff, P, Reidenbach, M, Renger, B, Rippich, C, Scheer, M, Schmitt, P, Schotanus, J, Schütte, J, Schwarz, A, Sievers, D, Skwarnicki, T, Stock, V, Strauch, K, Strohbusch, U, Tompkins, J, Trost, HJ, van Uitert, B, Van de Walle, RT, Vogel, H, Voigt, A, Volland, U, Wachs, K, Wacker, K, Walk, W, Wegener, H, Williams, DA & Zschorsch, P 1990, 'Observation of a new ηπ⁰π⁰ resonance at 1900 MeV/c² in two-photon scattering', Physics Letters B, vol. 249, no. 2, pp. 353-358. https://doi.org/10.1016/0370-2693(90)91268-G

@article{3d871092aee6429dadf1f7a761a96bf3,

title = "Observation of a new ηπ0π0 resonance at 1900 MeV/c2 in two-photon scattering",

abstract = "Using the Crystal Ball detector at the DORIS II e+e- storage ring, we measure the ηπ0π0 mass spectrum in the reaction e+e-→e+e-ηπ 0π0→e+e-6γ from the ηπ0π0 threshold to about 2500 MeV/c2. The spectrum is dominated by the η′, for which we determine Γγγ(η′)BR(η'→6γ)=0 .36±0.02±0.03 keV. In addition, we observe an enhancement in the cross section near 1900 MeV/c2 which we attribute to the two-photon production of a new resonance X(1900). The angular distributions and the invariant mass distribution of the ηπ0 subsystem are consistent with those expected for the hypothetical η2 meson with JPC=2-+. For this JP assignment the resonance parameters are M(X) = 1876 ±35±50 MeV/c2, Γtot(X)=228±90±34 MeV/c2 and Γγγ(X)BR(X→ηππ) = 0.9±0.2±0.3 keV.",

author = "K. Karch and D. Antreasyan and Bartels, {H. W.} and D. Besset and Ch Bieler and Bienlein, {J. K.} and A. Bizzeti and Bloom, {E. D.} and I. Brock and K. Brockm{\"u}ller and R. Cabenda and A. Cartacci and M. Cavalli-Sforza and R. Clare and A. Compagnucci and G. Conforto and S. Cooper and R. Cowan and D. Coyne and A. Engler and K. Fairfield and G. Folger and A. Fridman and J. Gaiser and D. Gelphman and G. Glaser and G. Godfrey and K. Graaf and Heimlich, {F. H.} and Heinsius, {F. H.} and R. Hofstadter and J. Irion and Z. Jakubowski and H. Janssen and S. Keh and T. Kiel and H. Kilian and I. Kirkbride and T. Kloiber and M. Kobel and W. Koch and K{\"o}nig, {A. C.} and K. K{\"o}nigsmann and Kraemer, {R. W.} and S. Kr{\"u}ger and G. Landi and R. Lee and S. Leffler and R. Lekebusch and Litke, {A. M.} and W. Lockman and S. Lowe and B. Lurz and D. Marlow and H. Marsiske and W. Maschmann and P. McBride and F. Messing and Metzger, {W. J.} and H. Meyer and B. Monteleoni and B. Muryn and R. Nernst and B. Niczyporuk and G. Nowak and C. Peck and Pelfer, {P. G.} and B. Pollock and Porter, {F. C.} and D. Prindle and P. Ratoff and M. Reidenbach and B. Renger and C. Rippich and M. Scheer and P. Schmitt and J. Schotanus and J. Sch{\"u}tte and A. Schwarz and D. Sievers and T. Skwarnicki and V. Stock and K. Strauch and U. Strohbusch and J. Tompkins and Trost, {H. J.} and {van Uitert}, B. and {Van de Walle}, {R. T.} and H. Vogel and A. Voigt and U. Volland and K. Wachs and K. Wacker and W. Walk and H. Wegener and Williams, {D. A.} and P. Zschorsch",

note = "Funding Information: We would like to thankt heDESY and SLAC direc-toratesfo r their supportT. his experimenwt ouldnot have been possiblew ithoutthe dedicationo f the DORIS machineg roupas well as the experimental supportg roupsa t DESY. The visitingg roupst hank the DESY laboratoryfo r the hospitalitye xtendedto them. Z.J., B.N., B. Muryn, and G.N. thank DESY for financial support.E .D.B., R.H., and K.S. have benefitedfr omf inanciasl upportfr omthe Humboldt FoundationK. . K6nigsmanna cknowledgessu pport from the Heisenberfgo undationW. e thankM . Feindt for valuabled iscussions.",

year = "1990",

month = oct,

day = "18",

doi = "10.1016/0370-2693(90)91268-G",

language = "English (US)",

volume = "249",

pages = "353--358",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "2",

}

TY - JOUR

T1 - Observation of a new ηπ0π0 resonance at 1900 MeV/c2 in two-photon scattering

AU - Karch, K.

AU - Antreasyan, D.

AU - Bartels, H. W.

AU - Besset, D.

AU - Bieler, Ch

AU - Bienlein, J. K.

AU - Bizzeti, A.

AU - Bloom, E. D.

AU - Brock, I.

AU - Brockmüller, K.

AU - Cabenda, R.

AU - Cartacci, A.

AU - Cavalli-Sforza, M.

AU - Clare, R.

AU - Compagnucci, A.

AU - Conforto, G.

AU - Cooper, S.

AU - Cowan, R.

AU - Coyne, D.

AU - Engler, A.

AU - Fairfield, K.

AU - Folger, G.

AU - Fridman, A.

AU - Gaiser, J.

AU - Gelphman, D.

AU - Glaser, G.

AU - Godfrey, G.

AU - Graaf, K.

AU - Heimlich, F. H.

AU - Heinsius, F. H.

AU - Hofstadter, R.

AU - Irion, J.

AU - Jakubowski, Z.

AU - Janssen, H.

AU - Keh, S.

AU - Kiel, T.

AU - Kilian, H.

AU - Kirkbride, I.

AU - Kloiber, T.

AU - Kobel, M.

AU - Koch, W.

AU - König, A. C.

AU - Königsmann, K.

AU - Kraemer, R. W.

AU - Krüger, S.

AU - Landi, G.

AU - Lee, R.

AU - Leffler, S.

AU - Lekebusch, R.

AU - Litke, A. M.

AU - Lockman, W.

AU - Lowe, S.

AU - Lurz, B.

AU - Marlow, D.

AU - Marsiske, H.

AU - Maschmann, W.

AU - McBride, P.

AU - Messing, F.

AU - Metzger, W. J.

AU - Meyer, H.

AU - Monteleoni, B.

AU - Muryn, B.

AU - Nernst, R.

AU - Niczyporuk, B.

AU - Nowak, G.

AU - Peck, C.

AU - Pelfer, P. G.

AU - Pollock, B.

AU - Porter, F. C.

AU - Prindle, D.

AU - Ratoff, P.

AU - Reidenbach, M.

AU - Renger, B.

AU - Rippich, C.

AU - Scheer, M.

AU - Schmitt, P.

AU - Schotanus, J.

AU - Schütte, J.

AU - Schwarz, A.

AU - Sievers, D.

AU - Skwarnicki, T.

AU - Stock, V.

AU - Strauch, K.

AU - Strohbusch, U.

AU - Tompkins, J.

AU - Trost, H. J.

AU - van Uitert, B.

AU - Van de Walle, R. T.

AU - Vogel, H.

AU - Voigt, A.

AU - Volland, U.

AU - Wachs, K.

AU - Wacker, K.

AU - Walk, W.

AU - Wegener, H.

AU - Williams, D. A.

AU - Zschorsch, P.

N1 - Funding Information: We would like to thankt heDESY and SLAC direc-toratesfo r their supportT. his experimenwt ouldnot have been possiblew ithoutthe dedicationo f the DORIS machineg roupas well as the experimental supportg roupsa t DESY. The visitingg roupst hank the DESY laboratoryfo r the hospitalitye xtendedto them. Z.J., B.N., B. Muryn, and G.N. thank DESY for financial support.E .D.B., R.H., and K.S. have benefitedfr omf inanciasl upportfr omthe Humboldt FoundationK. . K6nigsmanna cknowledgessu pport from the Heisenberfgo undationW. e thankM . Feindt for valuabled iscussions.

PY - 1990/10/18

Y1 - 1990/10/18

N2 - Using the Crystal Ball detector at the DORIS II e+e- storage ring, we measure the ηπ0π0 mass spectrum in the reaction e+e-→e+e-ηπ 0π0→e+e-6γ from the ηπ0π0 threshold to about 2500 MeV/c2. The spectrum is dominated by the η′, for which we determine Γγγ(η′)BR(η'→6γ)=0 .36±0.02±0.03 keV. In addition, we observe an enhancement in the cross section near 1900 MeV/c2 which we attribute to the two-photon production of a new resonance X(1900). The angular distributions and the invariant mass distribution of the ηπ0 subsystem are consistent with those expected for the hypothetical η2 meson with JPC=2-+. For this JP assignment the resonance parameters are M(X) = 1876 ±35±50 MeV/c2, Γtot(X)=228±90±34 MeV/c2 and Γγγ(X)BR(X→ηππ) = 0.9±0.2±0.3 keV.

AB - Using the Crystal Ball detector at the DORIS II e+e- storage ring, we measure the ηπ0π0 mass spectrum in the reaction e+e-→e+e-ηπ 0π0→e+e-6γ from the ηπ0π0 threshold to about 2500 MeV/c2. The spectrum is dominated by the η′, for which we determine Γγγ(η′)BR(η'→6γ)=0 .36±0.02±0.03 keV. In addition, we observe an enhancement in the cross section near 1900 MeV/c2 which we attribute to the two-photon production of a new resonance X(1900). The angular distributions and the invariant mass distribution of the ηπ0 subsystem are consistent with those expected for the hypothetical η2 meson with JPC=2-+. For this JP assignment the resonance parameters are M(X) = 1876 ±35±50 MeV/c2, Γtot(X)=228±90±34 MeV/c2 and Γγγ(X)BR(X→ηππ) = 0.9±0.2±0.3 keV.

UR - http://www.scopus.com/inward/record.url?scp=0001731195&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001731195&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(90)91268-G

DO - 10.1016/0370-2693(90)91268-G

M3 - Article

AN - SCOPUS:0001731195

SN - 0370-2693

VL - 249

SP - 353

EP - 358

JO - Physics Letters B

JF - Physics Letters B

IS - 2

ER -

Observation of a new ηπ⁰π⁰ resonance at 1900 MeV/c² in two-photon scattering

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