Search Results - (Author, Cooperation:K. Ragan)
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1Latest Papers from Table of Contents or Articles in PressE. Aliu ; T. Arlen ; T. Aune ; M. Beilicke ; W. Benbow ; A. Bouvier ; S. M. Bradbury ; J. H. Buckley ; V. Bugaev ; K. Byrum ; A. Cannon ; A. Cesarini ; J. L. Christiansen ; L. Ciupik ; E. Collins-Hughes ; M. P. Connolly ; W. Cui ; R. Dickherber ; C. Duke ; M. Errando ; A. Falcone ; J. P. Finley ; G. Finnegan ; L. Fortson ; A. Furniss ; N. Galante ; D. Gall ; K. Gibbs ; G. H. Gillanders ; S. Godambe ; S. Griffin ; J. Grube ; R. Guenette ; G. Gyuk ; D. Hanna ; J. Holder ; H. Huan ; G. Hughes ; C. M. Hui ; T. B. Humensky ; A. Imran ; P. Kaaret ; N. Karlsson ; M. Kertzman ; D. Kieda ; H. Krawczynski ; F. Krennrich ; M. J. Lang ; M. Lyutikov ; A. S. Madhavan ; G. Maier ; P. Majumdar ; S. McArthur ; A. McCann ; M. McCutcheon ; P. Moriarty ; R. Mukherjee ; P. Nunez ; R. A. Ong ; M. Orr ; A. N. Otte ; N. Park ; J. S. Perkins ; F. Pizlo ; M. Pohl ; H. Prokoph ; J. Quinn ; K. Ragan ; L. C. Reyes ; P. T. Reynolds ; E. Roache ; H. J. Rose ; J. Ruppel ; D. B. Saxon ; M. Schroedter ; G. H. Sembroski ; G. D. Senturk ; A. W. Smith ; D. Staszak ; G. Tesic ; M. Theiling ; S. Thibadeau ; K. Tsurusaki ; J. Tyler ; A. Varlotta ; V. V. Vassiliev ; S. Vincent ; M. Vivier ; S. P. Wakely ; J. E. Ward ; T. C. Weekes ; A. Weinstein ; T. Weisgarber ; D. A. Williams ; B. Zitzer
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-10-08Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Jacot-Guillarmod, P. ; Perrier, J. ; Ragan, K. J. ; Rosselet, Ph. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. P. ; Thresher, J. J. ; Wood, A. T. ; Yanagisawa, C.
Springer
Published 1987Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In an experiment at the CERN-SPS charged hyperon beam, we have investigated the inclusive $$\Lambda \bar K^0 $$ and $$\Sigma ^0 \bar K^0 $$ final states formed in Ξ− Be interactions. In the $$\Lambda \bar K^0 $$ channel, we observe a signal at 1826 MeV/c2 which can be identified with the known Ξ(1820) resonance. We determine its mass and width to be:M=1826±4 MeV/c2, Г=12±14 MeV/c2. A moment analysis is consistent with a spin of 3/2 and indicates a negative parity for this spin assignment. Also in the $$\Lambda \bar K^0 $$ channel, we observe a 3.6σ signal with the following parameters:M=1963±5 MeV/c2, Г=25±15 MeV/c2. This state, which we call Ξ(1960), is not observed in the $$\Sigma ^0 \bar K^0 $$ channel, leading to an upper limit on the ratio of partial widths $$\Sigma \bar K/\Lambda \bar K$$ of 2.3 (90% confidence level). A moment analysis of the $$\Lambda \bar K^0 $$ final state indicates a spin of 5/2 or greater in the natural spin-parity series 5/2+, 7/2−, etc.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Jacot-Guillarmod, P. ; Modis, Th. ; Perrier, J. ; Ragan, K. J. ; Rosselet, Ph. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. -P. ; Thresher, J. J. ; Wood, A. T. ; Yanagisawa, C.
Springer
Published 1987Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The cross sections for Ξ− and Ω− inclusive production in Ξ− Be collisions at 116 GeV/c have been measured in the kinematic domain [0.1〈x F 〈0.9, 0〈p T 〈1.7 GeV/c]. The integrated cross sections per nucleon are found to be about twice as large as in Ξ− p collisions. The invariant cross sections increase by a factor of 70 for the Ξ− s and of 100 for the Ω− s between the central region (x F ∼0.2) and the projectile fragmentation region (x F ∼0.8). In the central region, they have about the same magnitude as the ones for Ξ− and Ω− inclusive production inp nucleon collisions. The Ξ− and Ω− polarisations have been measured over the same kinematic domain and are found to be compatible with zero.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesCarroll, J.T. ; Joshi, U. ; Auchincloss, P. ; Beretvas, A. ; Devlin, T. ; Flaugher, B. ; Hu, P. ; Kuns, E. ; CDF Level 3 Algorithm Group ; Ragan, K. ; Sliwa, K. ; Watts, T. ; Morita, Y.
Amsterdam : ElsevierStaff ViewISSN: 0168-9002Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesCarroll, J.T. ; Joshi, U. ; Auchincloss, P. ; Devlin, T. ; Flaugher, B. ; Hu, P. ; Watts, T. ; Ragan, K.
Amsterdam : ElsevierStaff ViewISSN: 0168-9002Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Doré, Ch. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Gray, R. J. ; Jacot-Guillarmod, P. ; Jeffreys, P. W. ; Louis, W. C. ; Modis, T. ; Mühlemann, P. ; Owen, R. C. ; Perrier, J. ; Ragan, K. J. S. ; Rosselet, Ph. ; Saunders, B. J. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. -P. ; Thresher, J. J.
Springer
Published 1985Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In an experiment performed in the CERN SPS hyperon beam we have obtained a value for the branching ratio $${{\Sigma ^ + \to p\gamma } \mathord{\left/ {\vphantom {{\Sigma ^ + \to p\gamma } {\Sigma ^ + \to p\pi }}} \right. \kern-\nulldelimiterspace} {\Sigma ^ + \to p\pi }}^0 of\left( {2.46_{ - 0.35}^{ + 0.30} } \right) \times 10^{ - 3} ,$$ corresponding to a branching ratio $${{\Sigma ^ + \to p\gamma } \mathord{\left/ {\vphantom {{\Sigma ^ + \to p\gamma } {\Sigma ^ + \to all}}} \right. \kern-\nulldelimiterspace} {\Sigma ^ + \to all}}of\left( {1.27_{ - 0.18}^{ + 0.16} } \right) \times 10^{ - 3} .$$ This result is discussed in the context of present understanding of hyperon radiative decays.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Doré, Ch. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Gray, R. J. ; Jacot-Guillarmod, P. ; Jeffreys, P. W. ; Louis, W. C. ; Modis, Th. ; Mühlemann, P. ; Owen, R. C. ; Perrier, J. ; Ragan, K. J. S. ; Rosselet, Ph. ; Saunders, B. J. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. -P. ; Thresher, J. J.
Springer
Published 1986Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In an experiment performed at the CERN-SPS charged hyperon beam, we have observed the radiative decay Λ→nγ, using well identified Λ from the decays of Ο− of 116 GeV/c momentum. Neutrons and photons from the Λ decays were observed in liquid argon and lead glass detectors. From a sample of 31 candidates, containing an estimated background of 7.3 events, the decay branching ratio was measured to be Γ(Λ→nγ)/Γ(Λ→all)=(1.02±0.33)×10−3.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Doré, Ch. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Gray, R. J. ; Jacot-Guillarmod, P. ; Jeffreys, P. W. ; Louis, W. C. ; Mühlemann, P. ; Owen, R. C. ; Perrier, J. ; Ragan, K. J. S. ; Rosselet, Ph. ; Saunders, B. J. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. -P. ; Thresher, J. J. ; Weill, R.
Springer
Published 1987Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In an experiment performed at the CERN SPS charged hyperon beam, we have observed the radiative decay Ξ−→∑−γ. From a sample of 11 candidates, containing an estimated background of 1.6 events, the branching ratio is found to be: $$\Gamma (\Xi ^ - \to \Sigma ^ - \gamma )/(\Xi ^ - \to \Lambda \pi ^ - ) = (2.3 \pm 1.0) \times 10^{ - 4} .$$Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Doré, Ch. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Gray, R. J. ; Jacot-Guillarmod, P. ; Jeffreys, P. W. ; Modis, T. ; Owen, R. C. ; Perrier, J. ; Ragan, K. J. ; Rosselet, Ph. ; Saunders, B. J. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. P. ; Thresher, J. J. ; Weill, R. ; Wood, A. T.
Springer
Published 1986Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In a experiment at the CERN SPS charged hyperon beam using incident Ξ−, we have obtained evidence for the production of two Ω* resonances decaying into Ξ−π+ K −, with the following parameters:M 1=2251±12,Γ 1=48±20 MeV/c2, 78 ±23 events, andM 2=2284±12,Γ 2=26±23 MeV/c2 45±10 events. The first state is also observed as a 4.2σ effect in a subsample which contains an additionalK + orK 0 in the final state. Production cross sections and branching ratios to Ξ* K − and Ξ− K * are presented.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesBiagi, S. F. ; Bourquin, M. ; Brown, R. M. ; Burckhart, H. J. ; Extermann, P. ; Gailloud, M. ; Gee, C. N. P. ; Gibson, W. M. ; Jacot-Guillarmod, P. ; Perrier, J. ; Ragan, K. J. ; Rosselet, Ph. ; Schirato, P. ; Siebert, H. W. ; Smith, V. J. ; Streit, K. P. ; Thresher, J. J. ; Wood, A. T. ; Yanagisawa, C.
Springer
Published 1987Staff ViewISSN: 1434-6052Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In an experiment carried out in the CERN SPS hyperon beam, the diffractive dissociation of incidentΞ − hyperons into ΛK − andΞ −π+π− final states has been observed. Several resonances are seen in the final states, including the well known Ξ(1820) which appears in both channels, and the Ξ(1680) which appears as a narrow state (M=1691.1±2.7 MeV/c2, Γ〈8 MeV/c2) in the ΛK− channel and possibly also in the Ξππ channel.Type of Medium: Electronic ResourceURL: