34 research outputs found

    J-PARC E27 Experiment to Search for a K−pp Bound State

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    We have carried out an experimental search for the simplest kaonic nucleus, KppK^{ - }pp, by using the d(π+,K+)d(\pi ^{ + },K^{ + }) reaction at pπ+p_{\pi ^{ + }} = 1.69 GeV/cc. The differential cross section of this reaction with covering a wide missing-mass range from the Λ\Lambda production threshold to the Λ(1405)/Σ(1385)\Lambda (1405)/\Sigma (1385) region has been measured for the first time. The inclusive missing-mass shape of the Λ\Lambda and Σ\Sigma production region was understood with a simple quasi-free picture except for an enhancement at 2.13 GeV/c2c^{2} due to a ΣN\Sigma N cusp. An obtained peak attributed to YY^{*} production was significantly shifted to the low mass side compared with the simulation by 22.4 - 22.4 MeV/c2c^{2}

    A Σp\Sigma p scattering Experiment at J-PARC and the Analysis Status

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    International audienceJ-PARC E40 aims to measure the differential cross sections of the Σ^±p elastic scatterings and the Σ^−p → Λn conversion. A clear peak of Σ^− was observed in a missing mass spectrum of the π^−p → K^+X reaction and recoil protons from the πp elastic scattering were successfully observed in the data taken in the summer 2018. The rest of data taking is coming in the spring 2019

    Strangeness physics programs by S-2S at J-PARC

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    In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δp/p = 6 × 10−4 in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of Ξ12Be) and E94 (missing-mass spectroscopy of Λ7Li, Λ10B, and Λ12C) experiments

    J-PARC E19 Experiment: Pentaquark Θ+ Search in Hadronic Reaction at J-PARC

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    A search for the Θ^+ pentaquark in the πpKX\pi ^{ - }p \to K^{ - }X reaction was performed at the J-PARC Hadron Facility. Two data samples were collected in 2010 and 2012 at π beam momenta of 1.92 and 2.0 GeV/c, respectively. No peak structure was observed in the missing mass spectra obtained from either data set. The upper limit for the production cross section averaged over the scattering-angle range of 2° to 15° in the laboratory frame was found to be 0.28 µb/sr. The decay width of the Θ^+ can be directly connected to the production cross section through a theoretical calculation using an effective Lagrangian. The estimated upper limits of the width were 0.41 and 2.8 MeV for the spin-parities of 1/2^+ and 1/2^−, respectively

    Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume I Introduction to DUNE

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    International audienceThe preponderance of matter over antimatter in the early universe, the dynamics of the supernovae that produced the heavy elements necessary for life, and whether protons eventually decay—these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our universe, its current state, and its eventual fate. The Deep Underground Neutrino Experiment (DUNE) is an international world-class experiment dedicated to addressing these questions as it searches for leptonic charge-parity symmetry violation, stands ready to capture supernova neutrino bursts, and seeks to observe nucleon decay as a signature of a grand unified theory underlying the standard model. The DUNE far detector technical design report (TDR) describes the DUNE physics program and the technical designs of the single- and dual-phase DUNE liquid argon TPC far detector modules. This TDR is intended to justify the technical choices for the far detector that flow down from the high-level physics goals through requirements at all levels of the Project. Volume I contains an executive summary that introduces the DUNE science program, the far detector and the strategy for its modular designs, and the organization and management of the Project. The remainder of Volume I provides more detail on the science program that drives the choice of detector technologies and on the technologies themselves. It also introduces the designs for the DUNE near detector and the DUNE computing model, for which DUNE is planning design reports. Volume II of this TDR describes DUNE's physics program in detail. Volume III describes the technical coordination required for the far detector design, construction, installation, and integration, and its organizational structure. Volume IV describes the single-phase far detector technology. A planned Volume V will describe the dual-phase technology