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    Evidence for narrow states decaying into (Λ p + pions) at 3.1GeV / c 2 with charges + 1, 0 and −1 (English)

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    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 172 , 1 ; 113-118  ; 1986
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

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    Abstract Evidence for narrow states produced by Σ − interactions in beryllium, and decaying into (Λ p + pions), has been obtained in an experiment at the CERN SPS hyperon beam. At 3.1 GeV/c 2, the (Λ p π+ π+), (Λ p π+ π+ π−) and (Λ p π+ π−) effective mass distributions show an excess of 45, 19 and 62 events above a background of 50, 28 and 187, respectively. The possibility that these three signals are statistical fluctuations is remote. The observed widths of the signals are compatible with the mass resolution of the apparatus, 24 MeV/c 2 FWHM. We have not been able to find an interpretation of the quantum numbers of the final states, which are baryon number 0, strangeness −1 and charge +1, 0 and −1.

    Table of contents – Volume 172, Issue 1

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    1
    Determination of the deuteron asymptotic D- to S-state ratio by a padé-approximant technique
    Horáček, J. / Bok, J. / Krasnopolskij, V.M. / Kukulin, V.I. et al. | 1986
    5
    Novel time-reversal tests in low-energy neutron propagation
    Stodolsky, Leo et al. | 1986
    10
    The single-particle interaction in nuclear matter via the relativistic Dirac-Brueckner approach
    ter Haar, Bernard / Malfliet, Rudi et al. | 1986
    17
    Solution of the Vlasov equation for compressed and heated spherical nuclei
    Vinet, L. / Sébille, F. / Grégoire, C. / Rémaud, B. / Schuck, P. et al. | 1986
    23
    First observation of the Δ resonance in relativistic heavy-ion charge-exchange reactions
    Bachelier, D. / Boyard, J.L. / Hennino, T. / Jourdain, J.C. / Roy-Stephan, M. / Contardo, D. / Grossiord, J.Y. / Guichard, A. / Pizzi, J.R. / Radvanyi, P. et al. | 1986
    27
    Energy dependence of source radii and emission temperatures for 14 N induced reactions at E A = 35 MeV
    Chitwood, C.B. / Gelbke, C.K. / Pochodzalla, J. / Chen, Z. / Fields, D.J. / Lynch, W.G. / Morse, R. / Tsang, M.B. / Boal, D.H. / Shillcock, J.C. et al. | 1986
    32
    The gauge-covariant formulation of interacting strings and superstrings
    Awada, M.A. et al. | 1986
    40
    Instantons, the β-function and renormalisation scheme dependence
    Morris, T.R. / Ross, D.A. / Sachrajda, C.T. et al. | 1986
    46
    Consistent real-time propagators for any spin, mass, temperature and density
    Landsman, N.P. et al. | 1986
    49
    Quantization of chiral solitons for three flavors and the large-N limit
    Karl, G. / Patera, J. / Perantonis, S. et al. | 1985
    53
    The fermion propagator matrix in lattice QCD
    Gibbs, P.E. et al. | 1986
    62
    Charge radii from lattice relative charge distributions
    Wilcox, Walter / Liu, Keh-Fei et al. | 1986
    65
    The phase structure of the SU(3) lattice gauge-Higgs model
    Gerdt, V.P. / Mitrjushkin, V.K. / Zadorozhny, A.M. et al. | 1986
    71
    Weak gauge coupling expansion in the lattice-regularized standard SU(2) Higgs model
    Montvay, I. et al. | 1986
    77
    Microcanonical renormalization group for SU(2)
    Stolorz, Paul et al. | 1986
    81
    On the relation between many-color QCD and the free nambu string on the lattice
    Ilgenfritz, E.-M. / Makeenko, Yu.M. / Shahbazyan, T.V. et al. | 1986
    86
    The nature of the transition in d = 4 U(1) lattice gauge theory
    Gupta, Rajan / Novotny, Mark A. / Cordery, Robert et al. | 1986
    93
    Another higher order Langevin algorithm for QCD
    Kronfeld, Andreas S. et al. | 1985
    97
    A variational source method for numerical studies of field theory
    Degrand, Thomas et al. | 1986
    101
    Equal-time Lorentz covariance for bound states
    Hoyer, Paul et al. | 1986
    104
    Multiplicities without KNO: Parton branching versus negative binomial
    Durand, Bernice / Sarcevic, Ina et al. | 1986
    109
    QCD corrections to the parton-model sum rules for structure functions of deep inelastic scattering
    Gorishny, S.G. / Larin, S.A. et al. | 1986
    113
    Evidence for narrow states decaying into (Λ p + pions) at 3.1GeV / c 2 with charges + 1, 0 and −1
    Bourquin, M. / Brown, R.M. / Burckhart, H.J. / Extermann, P. / Gailloud, M. / Gibson, W.M. / Gordon, J.C. / Jacot-Guillarmod, P. / Rosselet, Ph. / Schirato, P. et al. | 1986
    iii
    Editorial Board
    | 1986

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