Author: "Kenneth M. Crowe" - Searchworks@Jio Institute Digital Library Search Results

1. High precision study of muon catalyzed fusion in D2 and HD gas

Author: G. N. Schapkin, S. M. Kozlov, N. I. Voropaev, V.A. Ganzha, A.A. Vasiliev, M. P. Faifman, T. Case, G. G. Semenchuk, Johann Marton, D. V. Balin, M. A. Soroka, B. Lauss, G. E. Petrov, F. J. Hartmann, V. Trofimov, An.A. Vorobyov, Kenneth M. Crowe, B. Gartner, C. Petitjean, Johann Zmeskal, E. M. Maev, and P. Kammel
Subjects: Nuclear physics, Nuclear reaction, Physics, Nuclear and High Energy Physics, Muon-catalyzed fusion, Muon, Branching fraction, Helium-3, Atomic physics, Quantum number, Hyperfine structure, Lepton
Abstract: Muon catalyzed dd fusion in D2 and HD gases in the temperature range from 28 to 350 K was investigated in a series of experiments based on a time-projection ionization chamber operating with pure hydrogen. All main observables in this reaction chain were measured with high absolute precision including the resonant and non-resonant ddμ formation rates, the rate for hyperfine transitions in dμ atoms, the branching ratio of the two charge symmetric fusion channels 3He + n and t + p and the muon sticking probability. The report presents the final analysis of the data together with a comprehensive comparison with calculations based on recent μCF theories. The energy of the loosely bound ddμ state with quantum numbers J = 1, ν = 1, which is central to the mechanism of resonant molecule formation, is extracted with precision ɛ11(fit) = −1.9651(7) eV. in impressive agreement with the latest theoretical results ɛ11(theory) = −1.9646 eV.
Published: 2011
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2. Annihilation at rest of antiprotons and protons into neutral particles

Author: M. Suffert, C.J. Batty, A. V. Anisovich, V. Crede, U. Thoma, H. Kalinowsky, N.P. Hessey, J.S. Suh, C.A. Baker, C. A. Meyer, M. Heinzelmann, W. Dünnweber, Michael Doser, F. H. Heinsius, D. Jamnik, R. Landua, S. Wallis-Plachner, D. Engelhardt, M. Benayoun, M. A. Faessler, Marcel Kunze, Herbert Koch, Kenneth M. Crowe, K. Wittmack, B. Pick, S. Spanier, K. Peters, D. Walther, B. S. Zou, Claude Amsler, J. Kisiel, U. Strohbusch, U. Wiedner, U. Kurilla, K. Braune, Pàl Hidas, I. Uman, A. V. Sarantsev, P. Kammel, B.M. Barnett, W. Popkov, L. Montanet, R. P. Haddock, P. Blüm, D.V. Bugg, J. Reinnarth, T. Case, H. Matthäy, M. Ratajczak, W. Roethel, Eberhard Klempt, R. Ouared, F. Meyer-Wildhagen, and C. Regenfus
Subjects: Rest (physics), Physics, Nuclear and High Energy Physics, Annihilation, Meson, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, 7. Clean energy, Nuclear physics, Crystal, Antiproton, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Liquid hydrogen, Bar (unit)
Abstract: Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing π 0 , η , η ′ and ω mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. Including annihilation frequencies for production of neutral kaons from other experiments, the identified reactions for annihilation in liquid hydrogen add up to a branching fraction of (3.56±0.28)% per annihilation compared to the frequency of (3.50±0.30)% with which we observe the all-neutral decay modes inclusively. Since the exclusive final states are normalized to the Crystal Barrel measurement of the π 0 π 0 branching ratio, the latter result is strongly supported by this present study.
Published: 2003
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3. Measurement of the Formation Rate of Muonic Hydrogen Molecules

Author: A. A. Vasilyev, K. R. Lynch, Jules Deutsch, An.A. Vorobyov, T. P. Gorringe, J. Egger, D. W. Hertzog, R. M. Carey, Malte Hildebrandt, O. Maev, P. Kammel, V.A. Ganzha, B. Kiburg, Stuart J. Freedman, Françoise Mulhauser, M. Vznuzdaev, P. Winter, René Prieels, T. I. Banks, V. A. Andreev, G. G. Semenchuk, Kenneth M. Crowe, T. Case, A. G. Krivshich, G. N. Schapkin, V. Tishchenko, M. A. Soroka, C. Petitjean, Bernhard Lauss, P. Kravtsov, E. M. Maev, S. Knaack, S. M. Clayton, G. E. Petrov, F. Gray, and UCL - SST/IRMP - Institut de recherche en mathématique et physique
Subjects: Physics, Nuclear and High Energy Physics, Muon, Physics - Instrumentation and Detectors, Proton, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Lambda, Coupling (probability), 01 natural sciences, High Energy Physics - Experiment, Pseudoscalar, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Atom, Molecule, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment, Exotic atom
Abstract: Background: The rate \lambda_pp\mu\ characterizes the formation of pp\mu\ molecules in collisions of muonic p\mu\ atoms with hydrogen. In measurements of the basic weak muon capture reaction on the proton to determine the pseudoscalar coupling g_P, capture occurs from both atomic and molecular states. Thus knowledge of \lambda_pp\mu\ is required for a correct interpretation of these experiments. Purpose: Recently the MuCap experiment has measured the capture rate \Lambda_S from the singlet p\mu\ atom, employing a low density active target to suppress pp\mu\ formation (PRL 110, 12504 (2013)). Nevertheless, given the unprecedented precision of this experiment, the existing experimental knowledge in \lambda_pp\mu\ had to be improved. Method: The MuCap experiment derived the weak capture rate from the muon disappearance rate in ultra-pure hydrogen. By doping the hydrogen with 20 ppm of argon, a competing process to pp\mu\ formation was introduced, which allowed the extraction of \lambda_pp\mu\ from the observed time distribution of decay electrons. Results: The pp\mu\ formation rate was measured as \lambda_pp\mu = (2.01 +- 0.06(stat) +- 0.03(sys)) 10^6 s^-1. This result updates the \lambda_pp\mu\ value used in the above mentioned MuCap publication. Conclusions: The 2.5x higher precision compared to earlier experiments and the fact that the measurement was performed at nearly identical conditions to the main data taking, reduces the uncertainty induced by \lambda_pp\mu\ to a minor contribution to the overall uncertainty of \Lambda_S and g_P, as determined in MuCap. Our final value for \lambda_pp\mu\ shifts \Lambda_S and g_P by less than one tenth of their respective uncertainties compared to our results published earlier., Comment: 12 pages, 6 figures, to be submitted to Phys. Rev. C
Published: 2015

4. Study of high-pressure hydrogen-operated wire chambers designed for a precision measurement of the singlet μp capture rate

Author: An.A. Vorobyov, P. Kammel, G. G. Semenchuk, S. M. Sadetsky, R. Schmidt, J. Egger, Kenneth M. Crowe, V.A. Ganzha, A.G. Krivchitch, Nikolai Voropaev, A. A. Fetisov, G. E. Petrov, P. U. Dick, C. Petitjean, G. N. Schapkin, A. Dijksman, René Prieels, F. J. Hartmann, V. A. Andreev, W. Herold, M. A. Soroka, E. M. Maev, T. Case, and O.E. Maev
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, Muon, Hydrogen, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Electron, Muon capture, Nuclear physics, chemistry, High Energy Physics::Experiment, Instrumentation, Beam (structure), Bar (unit)
Abstract: This work was carried out as part of a project aiming at a greatly improved measurement of the muon capture rate from the singlet state of the μp atom. The experiment will be performed at the intense muon beam of PSI using a new experimental method allowing high precision measurements of the lifetime of muons stopped in ultra-pure deuterium-depleted hydrogen (protium). The basic element of the detector is a time projection chamber operating in hydrogen gas at 10 bar pressure. The arrival times and trajectories of the incoming muons and the outgoing decay electrons are measured with this device providing effective suppression of background. The system of chambers and electronics is designed for the large muon stop rates required for attaining high statistical accuracy. During four beam periods at PSI, data were taken. Also, various studies of the MWPC performance in hydrogen were made including ageing studies of the chambers under irradiation with stopped muons and with alpha and beta sources. It was demonstrated that the MWPCs can operate in pure hydrogen under 10 bar pressure with gas gains up to 5000, which is sufficient for the detection of relativistic electrons.
Published: 2002
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5. Directed Flow ofΛHyperons in(2–6)AGeVAu+AuCollisions

Author: M. A. Lisa, S. Y. Panitkin, N. T. B. Stone, H. G. Ritter, L. S. Schroeder, D. Best, David Krofcheck, E. Hjort, T. Wienold, T. Case, D. Keane, P. Chung, N. N. Ajitanand, G. Rai, J. L. Chance, Morton Kaplan, D. Cebra, F. P. Brady, G. Odyniec, S. Gushue, J. Whitfield, Y. M. Liu, Z. Milosevich, R. Witt, M. L. Gilkes, B. K. Srivastava, T. J. M. Symons, J. L. Romero, L. Wood, Brian Cole, Matthew J. Anderson, N. T. Porile, R. P. Scharenberg, J. Lauret, R. L. McGrath, J. M. Alexander, A. C. Das, H. Liu, J. L. Klay, Roy A. Lacey, M. Heffner, A. S. Hirsch, J. E. Draper, W. N. Zhang, M. Justice, Kenneth M. Crowe, D. L. Olson, W. Caskey, J. C. Kintner, Lei Huo, and C. Pinkenburg
Subjects: Nuclear reaction, Physics, Nuclear Theory, Hadron, Hyperon, General Physics and Astronomy, Elementary particle, Lambda baryon, Lambda, Baryon, Nuclear physics, Atomic physics, Nuclear Experiment, Nucleon
Abstract: Directed flow measurements for {Lambda} hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2A, 4A, and 6AGeV; b
Published: 2001
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6. [Untitled]

Author: V. A. Andreev, G. N. Schapkin, An.A. Vorobyov, F. J. Hartmann, V. I. Jatsoura, Jules Deutsch, B. Gartner, S. J. Freedman, N. I. Voropaev, C. J. G. Onderwater, S. M. Sadetsky, W. D. Herold, V.A. Ganzha, A. Dijksman, B. Lauss, Oleg Maev, P. U. Dick, Frederick Gray, P. T. Debevec, Richard Schmidt, P. Kammel, D. V. Balin, T. Case, V. E. Markushin, A. G. Krivshich, G. E. Petrov, S. M. Clayton, D. B. Chitwood, G. G. Semenchuk, J. Egger, A. A. Fetisov, R. M. Carey, E. M. Maev, C. C. Polly, René Prieels, Jan Govaerts, D. W. Hertzog, Kenneth M. Crowe, C. Petitjean, M. A. Soroka, and D. Fahrni
Subjects: Physics, Nuclear and High Energy Physics, Muon-catalyzed fusion, Particle physics, Muon, Time projection chamber, Proton, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Muon capture, Nuclear physics, Particle decay, Physical and Theoretical Chemistry, Exotic atom, Lepton
Abstract: The aim of the MuCap experiment is a 1% measurement of the singlet capture rate Lambda_S for the basic electro-weak reaction mu + p -> n + nu_mu. This observable is sensitive to the weak form-factors of the nucleon, in particular to the induced pseudoscalar coupling constant g_P. It will provide a rigorous test of theoretical predictions based on the Standard Model and effective theories of QCD. The present method is based on high precision lifetime measurements of mu^- in hydrogen gas and the comparison with the free mu^+ lifetime. The mu^- experiment will be performed in ultra-clean, deuterium-depleted H_2 gas at 10 bar. Low density compared to liquid H_2 is chosen to avoid uncertainties due to ppmu formation. A time projection chamber acts as a pure hydrogen active target. It defines the muon stop position in 3-D and detects rare background reactions. Decay electrons are tracked in cylindrical wire-chambers and a scintillator array covering 75% of 4 pi. Comment: Int. RIKEN Conf. on Muon Catalyzed Fusion and Related Exotic Atoms, April 2001, Shimoda, Japan, to be published in Hyperfine Interactions
Published: 2001
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7. [Untitled]

Author: G. N. Schapkin, G. G. Semenchuk, C. Petitjean, F. J. Hartmann, R. Schmidt, Pu Dick, An.A. Vorobyov, P. Kammel, V.A. Ganzha, J. Egger, A. Dijksman, Kenneth M. Crowe, G. E. Petrov, V. A. Andreev, A. A. Fetisov, M. A. Soroka, S. M. Sadetsky, René Prieels, D. Fahrni, A.G. Krivchitch, E. M. Maev, N.I. Voropaev, OE Maev, and T. Case
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, Muon, Hydrogen, Proton, Physics::Instrumentation and Detectors, chemistry.chemical_element, Scintillator, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Particle detector, Muon capture, Nuclear physics, chemistry, Physical and Theoretical Chemistry, Bar (unit)
Abstract: A new experiment is under preparation with the aim to improve considerably the present knowledge of the rate Lambda(s), which should be measured on a level of 1% or better, for the basic electroweak capture reaction of a negative muon on the free proton mup(1s) --> n + nu(mu). The capture rate will be determined by measuring the lifetime of mu(-) stopped in ultra pure hydrogen at 10 bar pressure and comparing it with the lifetime of the unbound mu(+). A new experimental method was developed for this project which should allow measuring the mu(-) lifetime with at least 10 ppm precision. The basic element of the detector is operating in the hydrogen gas time projection chamber (TPC) surrounded by multi-wire proportional chambers (MWPCs) and scintillator counters. The arrival times and trajectories of the incoming muons and the outgoing decay electrons are measured with this device providing effective suppression of background. Using the TPC as an active target, we can monitor on-line the protium contamination by impurities with a sensitivity better than 10(-8). This can be done by detecting the charged products of the muon capture reaction on these impurities. It was demonstrated that the TPC and MWPCs can operate in pure hydrogen under 10 bar pressure providing gas gain up to 10 000.
Published: 2001
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8. Branching ratios for p annihilation at rest into two-body final states

Author: F. H. Heinsius, P. Blüm, D.V. Bugg, U. Strohbusch, C. Straßburger, K. Wittmack, R. Ouared, U. Kurilla, D. Walther, D. Jamnik, J.S. Suh, D. Engelhardt, A. Abele, C.J. Batty, M. A. Faessler, C. Völcker, R.P. Haddock, M. Herz, P. Giarritta, Herbert Koch, Claude Amsler, J. Adomeit, I. Uman, Michael Doser, Marcel Kunze, H. Stöck, A. Herbstrith, C. Holtzhaußen, C. A. Meyer, K. Peters, W. Dünnweber, R. McCrady, M. Lakata, C. Regenfus, J. Kisiel, U. Wiedner, M. Suffert, T. Case, H. Matthäy, B. Pick, P. Kammel, K. Braune, M. Heinzelmann, C.A. Baker, S. Wallis-Plachner, L. Montanet, B.M. Barnett, M. Benayoun, Kenneth M. Crowe, B.S. Zou, H. Kalinowsky, J. Meier, S. Spanier, U. Thoma, C. Hodd, S. Bischoff, Eberhard Klempt, Pàl Hidas, T. Degener, W. Roethel, M. Tischhäuser, M. Ratajczak, N.P. Hessey, and R. Landua
Subjects: Physics, Nuclear and High Energy Physics, Annihilation, Hydrogen, chemistry, Branching fraction, Analytical chemistry, chemistry.chemical_element, Atomic physics, Branching (polymer chemistry), Particle Physics - Experiment
Abstract: Measurements of two-body branching ratios for p p annihilations at rest in liquid and gaseous (12 ρ STP ) hydrogen are reported. Channels studied are p p →π 0 π 0 ,π 0 η , K 0 S K 0 L , K + K − . The branching ratio for the π 0 π 0 channel in liquid H 2 is measured to be ( 6.14±0.40)×10 −4 . The results are compared with those from other experiments. The fraction of P-state annihilation for a range of target densities from 0.002 ρ STP to liquid H 2 is determined. Values obtained include 0.11±0.02 in liquid H 2 and 0.48±0.04 in 12 ρ STP H 2 gas.
Published: 2001
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9. [Untitled]

Author: Nikolai Voropaev, V. E. Markushin, J. Zmeskal, Kenneth M. Crowe, M. P. Faifman, B. Gartner, G. N. Schapkin, W. H. Breunlich, An.A. Vorobyov, D. V. Balin, G. E. Petrov, C. Petitjean, E. M. Maev, T. Case, F. J. Hartmann, P. Kammel, G. G. Semenchuk, and B. Lauss
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Muon-catalyzed fusion, Fusion, Time projection chamber, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Particle detector, Nuclear physics, Nucleosynthesis, Ionization, Measuring instrument, Physical and Theoretical Chemistry
Abstract: During 1994–1996, a series of μCF experiments were performed at PSI by the PSI-PNPI-IMEP-LBNL-TUM collaboration. These experiments aimed at high-precision studies of the d–μ–d fusion in D2 and HD gases in a wide temperature range. The Gatchina ionization time projection chamber has been used to detect the dd-fusion reaction products. The main parameters of the d–μ–d fusion have been measured with high absolute precision. In this report, we present the results of the final analysis of the experimental data. The obtained results are compared with the calculations based on a recent μCF-theory.
Published: 2001
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10. Antiflow ofKs0Mesons in6AGeVAu+AuCollisions

Author: James Alexander, E. Hjort, A. S. Hirsch, T. Case, H. G. Ritter, F. P. Brady, G. Odyniec, J. L. Romero, N. T. Porile, M. A. Lisa, Kenneth M. Crowe, H. Liu, N. T. B. Stone, Brian Cole, Matthew J. Anderson, L. S. Schroeder, R. L. McGrath, R. P. Scharenberg, R. Witt, A. C. Das, W. N. Zhang, N. N. Ajitanand, B. K. Srivastava, J. Lauret, J. L. Klay, Roy A. Lacey, M. Justice, M. Heffner, Lei Huo, S. Gushue, M. L. Gilkes, J. Whitfield, T. Wienold, S. Y. Panitkin, C. Pinkenburg, Morton Kaplan, L. Wood, J. L. Chance, D. Cebra, J. E. Draper, Z. Milosevich, D. L. Olson, W. Caskey, Y. M. Liu, T. J. M. Symons, G. Rai, D. Keane, P. Chung, D. Best, David Krofcheck, and J. C. Kintner
Subjects: Nuclear reaction, Physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Nuclear matter, 01 natural sciences, Nuclear physics, 0103 physical sciences, Impact parameter, 010306 general physics, Boson
Abstract: We have measured the sideward flow of neutral strange (K{sup 0}{sub s} ) mesons in 6A GeV Au +Au collisions. A prominent antiflow signal is observed for an impact parameter range (b(less-or-similar sign)7 fm ) which spans central and midcentral events. Since the K{sup 0}{sub s} scattering cross section is relatively small in nuclear matter, this observation suggests that the in-medium kaon vector potential plays an important role in high density nuclear matter. (c) 2000 The American Physical Society.
Published: 2000
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11. Bombarding Energy Dependence ofπ−Interferometry at the Brookhaven AGS

Author: G. Odyniec, S. Gushue, E. Hjort, D. Best, T. Case, W. N. Zhang, T. J. M. Symons, J. L. Romero, H. G. Ritter, R. P. Scharenberg, David Krofcheck, Y. M. Liu, J. L. Chance, Kenneth M. Crowe, M. L. Gilkes, D. Cebra, A. C. Das, H. Liu, Brian Cole, Matthew J. Anderson, J. L. Klay, Roy A. Lacey, F. P. Brady, J. E. Draper, M. Heffner, J. Whitfield, D. Keane, P. Chung, A. S. Hirsch, J. Lauret, N. N. Ajitanand, M. A. Lisa, J. C. Kintner, G. Rai, S. Y. Panitkin, Russell Wells, J. M. Alexander, R. Witt, L. Wood, B. K. Srivastava, D. L. Olson, W. Caskey, N. T. B. Stone, M. Justice, N. T. Porile, R. L. McGrath, L. S. Schroeder, Lei Huo, C. Pinkenburg, Z. Milosevich, T. Wienold, and Morton Kaplan
Subjects: Physics, Nuclear physics, Excitation function, Mean field theory, Reaction dynamics, General Physics and Astronomy, Alternating Gradient Synchrotron, Sensitivity (control systems), Atomic physics, Nuclear Experiment, Nuclear matter, Intensity (heat transfer), Energy (signal processing)
Abstract: We present the first excitation function of ${\ensuremath{\pi}}^{\ensuremath{-}}$ intensity interferometry at Alternating Gradient Synchrotron (AGS) energies (2--8 A GeV). The sensitivity of the multidimensional correlation functions to the geometry and dynamics of the pion-emitting system provides a stringent test of transport models of heavy ion collisions. Detailed comparisons with a realistic transport model, both with and without an explicit nuclear mean field, suggest that the beam energy evolution in the reaction dynamics is different in the model than in the data. A significantly increased ${\ensuremath{\pi}}^{\ensuremath{-}}$ emission time scale, which has been suggested as a signal of the onset of the transition to quark-gluon plasma, is not observed.
Published: 2000
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12. The ρ-mass, width and line shape in annihilation at rest into π+π−π0

Author: H. Stöck, W. Roethel, P. Blüm, Herbert Koch, F. H. Heinsius, D.V. Bugg, M. Heinzelmann, U. Strohbusch, C. Straßburger, K. Braune, S. Wallis-Plachner, S. Bischoff, A. Ehmanns, C. Holtzhaußen, A. Herbstrith, O. Cramer, D. Walther, A. Berdoz, K. Wittmack, C.J. Batty, R. Ouared, Claude Amsler, Eberhard Klempt, Michael Doser, V. Crede, W. Dünnweber, U. Kurilla, J. Adomeit, K. Peters, T. Case, H. Matthäy, J. Kisiel, U. Wiedner, I. Uman, C. A. Meyer, C.A. Baker, P. Kammel, Stefan M Spanier, M. Lakata, Kenneth M. Crowe, B.M. Barnett, U. Thoma, C. Hodd, B. Pick, M. A. Faessler, R.P. Haddock, D. Jamnik, T. Degener, B.S. Zou, D. Engelhardt, C. Regenfus, M. Herz, H. Kalinowsky, J. Meier, Pàl Hidas, P. Giarritta, R. McCrady, J.S. Suh, R. Landua, M. Suffert, C. Völcker, A. V. Anisovich, Marcel Kunze, M. Ratajczak, M. Tischhäuser, N.P. Hessey, and A. Abele
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Annihilation, Hadron physics, Pi, Line (formation), Bar (unit)
Abstract: The rho mass, width and line shape in p(over)-bar-p annihilation at rest into pi(+)pi(-)pi(0)
Published: 1999
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13. annihilation at rest into π+π−π−pspectator

Author: C.J. Batty, Michael Doser, H. Stöck, I. Uman, K. Peters, D. Walther, U. Strohbusch, C. Holtzhaußen, U. Kurilla, P. Kammel, O. Cramer, T. Case, H. Matthäy, P. Giarritta, Pàl Hidas, U. Wiedner, N. Djaoshvili, R. Landua, K. Wittmack, S. M. Spanier, R. Ouared, S. Bischoff, C. Pietra, R.P. Haddock, A. Herbstrith, B. Pick, M. Ratajczak, P. Schmidt, U. Thoma, C. Hodd, Claude Amsler, M. Suffert, R. Seibert, J.S. Suh, W. Dünnweber, R. McCrady, B.S. Zou, F. H. Heinsius, C. Völcker, M. Tischhäuser, Faessler, Marcel Kunze, H. Kalinowsky, K. Braune, J. Meier, C.A. Baker, M. Lakata, Nigel Hessey, M. Benayoun, Kenneth M. Crowe, J. Kisiel, C. Straßburger, M. Heinzelmann, T. Degener, M. Herz, S. Wallis-Plachner, B. M. Barnett, C. A. Meyer, Herbert Koch, A. Berdoz, Eberhard Klempt, C. N. Pinder, W. Roethel, D. Jamnik, D. Engelhardt, A. Abele, C. Regenfus, J. Adomeit, P. Blüm, and D.V. Bugg
Subjects: Rest (physics), Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Partial wave analysis, Pi
Published: 1999
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14. p¯pannihilation at rest intoKLK±π∓

Author: D. Walther, F. H. Heinsius, C. Völcker, M. A. Faessler, R.P. Haddock, U. Strohbusch, C. Pietra, J. Lüdemann, Marcel Kunze, P. Schmidt, K. Braune, W. Dünnweber, R. McCrady, C.J. Batty, H. Stöck, U. Wiedner, Herbert Koch, Č. Zupančič, A. Ehmanns, Claude Amsler, C.A. Baker, R. Landua, M. Ratajczak, U. Kurilla, A. Berdoz, R. Ouared, Michael Doser, M. Benayoun, B. Pick, S. M. Spanier, Pàl Hidas, P. Blüm, Kenneth M. Crowe, U. Thoma, M. Tischhäuser, Farid Ould-Saada, C. A. Meyer, C. Kolo, M. Suffert, R. Seibert, W. Roethel, M. Lakata, K. Beuchert, D. Jamnik, D. Engelhardt, O. Cramer, A. Abele, J. Adomeit, S. Wallis, K. Peters, H. Kalinowsky, J. Meier, S. Bischoff, P. Kammel, K. Wittmack, P. Giarritta, C. Holtzhaußen, J. Kisiel, S. Resag, T. Degener, M. Herz, A. Herbstrith, T. Case, H. Matthäy, C. N. Pinder, S. v. Dombrowski, Eberhard Klempt, L. Montanet, M. Heinzelmann, B. M. Barnett, V. Crede, B. Kämmle, C. Regenfus, Nigel Hessey, C. Strassburger, and N. Djaoshvili
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Annihilation, Branching fraction, Partial wave analysis, Pi, Dalitz plot, K matrix
Abstract: We present a measurement and partial wave analysis of the final state ${K}_{L}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ of $\overline{p}p$ annihilation at rest in liquid hydrogen. This reaction is important for the study of the $\overline{K}K$ decay mode of scalar resonances, in particular, the isovectors ${a}_{0}(980)$ and ${a}_{0}(1450).$ The determination of the ${a}_{0}(1450)$ production also fixes the $\overline{K}K$ coupling of the isoscalar ${f}_{0}(1500)$ which is discussed as a glueball. We find $B(\overline{p}\stackrel{\ensuremath{\rightarrow}}{p}{a}_{0}(1450)\ensuremath{\pi}{;a}_{0}(1450)\ensuremath{\rightarrow}\overline{K}K)=(8.88\ifmmode\pm\else\textpm\fi{}1.68)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and hence $B(\overline{p}\stackrel{\ensuremath{\rightarrow}}{p}{f}_{0}(1500)\ensuremath{\pi}{;f}_{0}(1500)\ensuremath{\rightarrow}\overline{K}K)=(4.52\ifmmode\pm\else\textpm\fi{}0.36)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ The mass and width of ${a}_{0}(1450)$ are $m=1480\ifmmode\pm\else\textpm\fi{}30\mathrm{MeV}{/c}^{2}$ and $\ensuremath{\Gamma}=265\ifmmode\pm\else\textpm\fi{}15\mathrm{MeV}{/c}^{2},$ respectively. For ${a}_{0}(980)$ we determine the relative ratio $B(\overline{p}\stackrel{\ensuremath{\rightarrow}}{p}{a}_{0}\ensuremath{\pi}{;a}_{0}\ensuremath{\rightarrow}\overline{K}K)/B(\overline{p}\stackrel{\ensuremath{\rightarrow}}{p}{a}_{0}\ensuremath{\pi}{;a}_{0}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\eta})$ =0.23\ifmmode\pm\else\textpm\fi{}0.05 and its relative coupling, $\overline{K}K$ to \ensuremath{\pi}\ensuremath{\eta}, is $1.03\ifmmode\pm\else\textpm\fi{}0.14.$
Published: 1998
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15. Study of at rest

Author: T. Case, H. Matthäy, A. Berdoz, S. Wallis, B. S. Zou, M. Suffert, R. Seibert, P. Kammel, M. Ratajczak, I. Scott, B.M. Barnett, A. Ehmanns, R. Ouared, C. Holtzhaußen, Nigel Hessey, C. Kolo, F. H. Heinsius, R. Landua, B. Pick, Pàl Hidas, H. Stöck, J. Kisiel, C. Völcker, P. Blüm, N. Djaoshvili, Eberhard Klempt, Marcel Kunze, D.V. Bugg, S. Bischoff, K. Wittmack, V. Crede, T. Degener, S. Resag, A. Herbstrith, O. Cramer, M. A. Faessler, M. Herz, U. Kurilla, C.A. Baker, U. Thoma, C. Hodd, J. Adomeit, P. Schmidt, Herbert Koch, C. Regenfus, M. Lakata, W. Dünnweber, A.N. Sarantsev, R. McCrady, M. Benayoun, K. Braune, C. A. Meyer, Kenneth M. Crowe, C. N. Pinder, W. Röthel, H. Kalinowsky, J. Meier, U. Wiedner, M. Tischhäuser, K. Beuchert, D. Jamnik, D. Engelhardt, A. Abele, R. P. Haddock, D. Walther, U. Strohbusch, C. Straßburger, Michael Doser, D. Ryabchikov, L. Montanet, B. Kämmle, C.J. Batty, and K. Peters
Subjects: Physics, Nuclear and High Energy Physics, Annihilation, Amplitude, Meson, Hydrogen, chemistry, Branching fraction, Mass spectrum, Resonance, chemistry.chemical_element, Atomic physics, Bar (unit)
Abstract: Crystal Barrel data are presented on p−p → ηπ0π0π0 at rest in liquid hydrogen and also in gaseous hydrogen at 12 bar. Annihilation from the initial 3P0 state relative to 3P2 is stronger in liquid than in gas by a factor 2.46 ± 0.15, in fair agreement with a prediction by Batty. There is a definite peak due to η(1440). Liquid data determine its mass as M = 1413 MeV, Γ = 49 ± 8 MeV. The mass is, however, lower in gas than in liquid by 12 ± 3 MeV; we attribute this mass shift to interference with broad background amplitudes. The η (1440) decays dominantly to ησ: BR [a0(980)π,a0 → ηπ]/BR[ησ] = 0.4 ± 0.2. However, there is strong destructive interference between these two decay modes. There is also a strong, broad ηππ component with JPC = 0−+, consistent with an earlier analysis proposing a very wide η(1800) resonance; it contributes 31% of the ηπ0π0π0 branching ratio in liquid. At the highest ηππ masses, there are definite 2−+ and l++ signals, but we cannot establish precise resonance masses or widths. There is also evidence for the production of f2 (1565), decaying to a2 (1320)π.
Published: 1998
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16. Collective flow and particle spectra in relativistic heavy ion collisions

Author: Yufeng Zhang, James Alexander, H. G. Ritter, M. Heffner, M. L. Gilkes, D. Keane, P. Chung, Y. M. Liu, Lei Huo, C. Pinkenburg, J. Whitfield, N. N. Ajitanand, G. Rai, A. C. Das, F. P. Brady, S. Wang, H. Liu, Roy A. Lacey, D. Best, Z. Milosevich, David Krofcheck, T. Wienold, Morton Kaplan, J. L. Romero, E. Hjort, T. Case, R. P. Scharenberg, Xiaodong Yang, A. S. Hirsch, L. Wood, Kenneth M. Crowe, J. L. Chance, D. Cebra, M. A. Lisa, Brian Cole, G. Odyniec, S. Gushue, W. N. Zhang, M. Justice, D. L. Olson, W. Caskey, J. E. Draper, B. K. Srivastava, N. T. B. Stone, N. T. Porile, R. L. McGrath, L. S. Schroeder, and T. J. M. Symons
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Time projection chamber, Proton, Solid angle, Observable, Rapidity, Atomic physics, Nuclear Experiment, Tracking (particle physics), Spectral line, Particle identification
Abstract: The E895 experiment has undertaken a systematic and exclusive study of Au+Au collisions between 2–8 A GeV. Complete event-by-event data were obtained using the EOS time projection chamber (TPC) which provided good particle identification and continuous tracking over almost 4π solid angle. In central Au+Au collisions at 6 A GeV, the proton rapidity distribution indicates almost complete stopping, hence high baryon density. We present preliminary results on collective flow observables as a function of beam energy. Data are compared with theoretical predictions.
Published: 1998
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17. A precision measurement of nuclear muon capture on 3He

Author: Johann Marton, F. J. Hartmann, W. H. Breunlich, P. Wojciechowski, C. Petitjean, V. M. Baturin, Yu. S. Grigoriev, B. Lauss, Kenneth M. Crowe, M. Muehlbauer, G. E. Petrov, An.A. Vorobyov, Yu. V. Smirenin, G. G. Semenchuk, Jan Govaerts, G. A. Beer, R. King, V. E. Markushin, N.I. Voropaev, P. Kammel, Wolfgang Schott, T. Case, E. M. Maev, W. Prymas, H. Daniel, J. Deutsch, Th. Petitjean, D. V. Balin, P. Ackerbauer, and René Prieels
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, education.field_of_study, Nuclear Theory, Population, FOS: Physical sciences, Muon capture, Pseudoscalar, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High pressure, Ionization chamber, Atom, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Nucleon, education, Nuclear Experiment, Hyperfine structure
Abstract: The muon capture rate in the reaction mu- 3He -> nu + 3H has been measured at PSI using a modular high pressure ionization chamber. The rate corresponding to statistical hyperfine population of the mu-3He atom is (1496.0 +- 4.0) s^-1. This result confirms the PCAC prediction for the pseudoscalar form factors of the 3He-3H system and the nucleon., 13 pages, 6 PostScript figures
Published: 1998
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18. Antiproton-proton annihilation at rest into KK±π∓π - manifestations of isospin interference

Author: S. Spanier, C. Kolo, S. Resag, M. Tischhäuser, C. A. Meyer, N. Djaoshvili, J. Kisiel, U. Wiedner, N.P. Hessey, M. Heinzelmann, F. Ould-Saada, M. Ratajcak, C.A. Baker, C. Regenfus, Eberhard Klempt, Č. Zupančič, P. Giarritta, W. Roethel, T. Case, H. Matthäy, T. Degener, R. Landua, L. Montanet, M. Lakata, S. Bischoff, M. Benayoun, Kenneth M. Crowe, Pàl Hidas, V. Crede, O. Cramer, K. Peters, P. Blüm, C. N. Pinder, S. Wallis, R. Ouared, A. Berdoz, B.S. Zou, P. Kammel, D.V. Bugg, H. Stöck, C. Pietra, U. Thoma, C. Hodd, Herbert Koch, H. Kalinowsky, B. Pick, D. Walther, U. Strohbusch, B.M. Barnett, J. Meier, C. Straßburger, M. Suffert, R. Seibert, Claude Amsler, C.J. Batty, Michael Doser, J. Reißmann, K. Braune, J. Adomeit, B. Kämmle, M. A. Faessler, R.P. Haddock, P. Schmidt, W. Dünnweber, R. McCrady, I. Scott, F. H. Heinsius, M. Herz, C. Holtzhaußen, K. Beuchert, U. Kurilla, D. Jamnik, D. Engelhardt, A. Abele, S v. Dombrowski, C. Völcker, Marcel Kunze, and A. Ehmanns
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Amplitude, Antiproton, Isospin, Strangeness
Abstract: The decay p p ( at rest ) → K L o K ± π ∓ π o , studied on a sample of more than 14000 events, is found to proceed dominantly via two-body channels containing resonances with open strangeness. Contributions from K 1 (1270) K and K 1 (1400) K , branching into the successive K1-decay modes, and from K ∗ K ∗ , K ∗ ( K π) s and (Kπ) s ( K π) s are extracted by means of a partial-wave analysis which accounts well for the data and also allows a search for weak contributions from other (Kππ) and from ( K K π ) resonances. Striking asymmetries between the charged and the neutral kaonic resonances give evidence for interfering isospin 0 and 1 annihilation amplitudes.
Published: 1997
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19. New precision measurements of dµd fusion

Author: T. Case, Johann Marton, G. G. Semenchuk, T. von Egidy, J. Zmeskal, D. V. Balin, P. Ackerbauer, V. E. Markushin, Wolfgang Schott, P. Kammel, W. Prymas, H. Daniel, C. Petitjean, M. Mühlbauer, G. Kminek, E. M. Maev, B. Lauss, An.A. Vorobyov, Yu. V. Smirenin, B. Gartner, W. H. Breunlich, G. E. Petrov, N. I. Voropaev, Kenneth M. Crowe, and F. J. Hartmann
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Fusion, Ionization chamber, Neutron, Physical and Theoretical Chemistry, Condensed Matter Physics, Atomic and Molecular Physics, and Optics
Abstract: A new experiment was started at PSI aiming for high-precision and complete studies of dµd fusion in D2, HD and D2/H2 gas mixtures. A high-pressure ionization chamber surrounded by a set of neutron counters is used to observe dd-fusion at temperatures between 25 and 350 K. Here we report preliminary results from the first test run with pure D2 filling.
Published: 1996
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20. Precision measurement of nuclear muon capture by3He

Author: Yu. S. Grigoriev, J. Egger, Jules Deutsch, P. Kammel, B. Lauss, H. Daniel, G. G. Semenchuk, P. Wojciechowski, B. van den Brandt, F. J. Hartmann, Johann Marton, V. N. Baturin, G. A. Beer, E. M. Maev, P. Ackerbauer, V. E. Markushin, Th. Petitjean, T. von Egidy, René Prieels, N. I. Voropaev, Jan Govaerts, D. V. Balin, M. Mühlbauer, Yu. V. Smirenin, Kenneth M. Crowe, Wolfgang Schott, W. Prymas, C. Petitjean, T. Case, W. H. Breunlich, G. E. Petrov, and An.A. Vorobyov
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, High Energy Physics::Experiment, Absolute rate, Physical and Theoretical Chemistry, Nuclear Experiment, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Muon capture
Abstract: In this article we report the results of an experiment performed in 1993 at PSI. The goal was to determine the absolute rate of nuclear muon capture by3He. In the experiment we used a new technique recently developed at Gatchina. As a preliminary result from this experiment we obtainedλ c=(1496±3(stat)-3(syst)) s−1.
Published: 1996
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21. A new project for the investigation of unsolved problems of ddµ and pdµ catalysis in D2 and H/D mixtures

Author: G. N. Schapkin, P. Ackerbauer, S. M. Kozlov, B. Gartner, J. Zmeskal, V.A. Ganzha, V. Trofimov, A. Brunnhuber, Yu.A. Misko, M. Mühlbauer, W. H. Breunlich, E. M. Maev, A.A. Vasiliev, G. G. Semenchuk, An.A. Vorobyov, Yu. V. Smirenin, T. Case, G. E. Petrov, N. I. Voropaev, P. Kammel, V. N. Baturin, Kenneth M. Crowe, F. J. Hartmann, T. von Egidy, B. Lauss, C. Petitjean, Wolfgang Schott, Johann Marton, H. Daniel, E. Steininger, D. V. Balin, and W. Prymas
Subjects: Nuclear and High Energy Physics, Fusion, Chemistry, Electron, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Coincidence, Charged particle, Catalysis, Muon capture, Ionization chamber, Neutron, Physical and Theoretical Chemistry, Atomic physics
Abstract: We propose to study a number of open problems in ddµ and pdµ fusion using the new high-pressure ionization chamber for charged particle identification in coincidence with the n-/e-counter array for the detection of neutrons and µ-decay electrons. Our first objective will be a precise measurement of the absolute rates of resonant and non-resonant ddµ formation in D2 and HD-gases and their temperature dependence from 40 to 350 K. Both output channels of the dd-reaction:3He + n and t + p will be observed and their ratio sensitive to contributions of S and P-waves will be determined. Simultaneously, we shall investigate the pdµ-cycle and determine the absolute pd-fusion yields in different molecular H/D compositions, observing tritons from nuclear muon capture in3Heµ: pdµ →3Heµ + γ. We have developed a special system for the preparation of HD-gas with high concentration (96%) of HD and a purity (10−6).
Published: 1996
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22. Further analysis of , ηηπ0 and ηπ0π0 at rest

Author: M. Suffert, R. Seibert, C.A. Baker, T. Kiel, C. Strassburger, O. Cramer, M. Benayoun, G. Pinter, Kenneth M. Crowe, C. N. Pinder, D. S. Armstrong, Herbert Koch, P. Schmidt, J. Adomeit, L. Montanet, W. Dünnweber, C.J. Batty, C. Kolo, R. McCrady, Nigel Hessey, A. Berdoz, Ingrid U. Scott, N. Djaoshvili, B. Kaemmle, T. Case, D. Walther, B.S. Zou, C. Holtzhaussen, P. Blüm, Pàl Hidas, U. Strohbusch, M. A. Faessler, R.P. Haddock, A. V. Sarantsev, H. Matthaey, D.V. Bugg, J. Meier, C. Voelcker, J. Reissmann, H. P. Dietz, A. Cooper, K. Braune, M. Tischhaeuser, M. Lakata, P. Kammel, C. A. Meyer, F. H. Heinsius, P. Illinger, C. Regenfus, U. Thoma, S. Bischoff, M. Herz, M. Englert, W. Roethel, K. Beuchert, D. Jamnik, D. Engelhardt, and A. Abele
Subjects: Rest (physics), Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Dalitz plot
Published: 1996
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23. A study of f0(1500) decays into 4π0 in at rest

Author: S. v. Dombrowski, D. S. Armstrong, Herbert Koch, Pàl Hidas, U. Thoma, S. Spanier, C.J. Batty, C. Kolo, T. Case, F. Ould-Saada, G. Pinter, H. Matthäy, U. Wiedner, M. Tischhäuser, Michael Doser, R. Hackmann, R. Ouared, A. Cooper, M. A. Faessler, R.P. Haddock, P. Schmidt, I. Scott, K. Peters, D. Walther, F. H. Heinsius, T. Degener, U. Strohbusch, C. Straßburger, O. Cramer, L. Montanet, N.P. Hessey, C. A. Meyer, J. Lüdemann, W. Dünnweber, S. Bischoff, R. McCrady, J. Adomeit, D. Urner, Eberhard Klempt, S. Resag, J. Zoll, M. Lakata, T. Kiel, H. P. Dietz, P. Blüm, M. Suffert, R. Seibert, H. Stöck, B.S. Zou, Č. Zupančič, K. Braune, W. Röthel, D.V. Bugg, A. Noble, H. Kalinowsky, B. Kalteyer, J. Meier, C.A. Baker, N. Djaoshvili, F. Walter, Claude Amsler, M. Benayoun, A. Berdoz, C. Regenfus, Kenneth M. Crowe, J. Brose, J. Reißmann, P. Kammel, B.M. Barnett, M. Englert, B. Kämmle, P. Giarritta, K. Beuchert, D. Jamnik, C. Holtzhaußen, D. Engelhardt, R. Landua, J. Kisiel, A. Abele, M. Herz, C. Völcker, Marcel Kunze, and C. N. Pinder
Subjects: Crystal, Physics, Rest (physics), Nuclear and High Energy Physics, Angular distribution, Amplitude, Phase space, Mass spectrum, Atomic physics
Abstract: Crystal Barrel data on p p → 5π 0 at rest are presented. Mass spectra for 2π0 combinations, 3π0 and 4π0 and decay angular distributions all differ significantly from phase space. We present several ways of fitting the data. All agree on the definite presence of the f0(1500), observed in its 4π0 decay mode. It can decay into ππ(1300) and into σσ where σ stands for the full ππ S-wave amplitude.
Published: 1996
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24. Evidence for two isospin zeroJ PC=2−+ mesons at 1645 and 1875 MeV

Author: M. Englert, N.P. Hessey, F. Ould-Saada, Pàl Hidas, M. Suffert, R. Seibert, T. Degener, A. Cooper, K. Beuchert, N. Djaoshvili, D. Urner, U. Wiedner, L. Montanet, D. Jamnik, D. Engelhardt, C. Regenfus, M. Herz, W. Roethel, I. Scott, R. Landua, F. H. Heinsius, K. Peters, C. Holtzhaußen, Herbert Koch, D. Walther, P. Giaritta, K. Braune, J. Brose, J. Kisiel, J. Reißmann, M. Tischhäuser, U. Thoma, C. A. Meyer, B. Kämmle, Eberhard Klempt, A. Noble, Michael Doser, R. Ouared, T. Kiel, H. P. Dietz, C. Völcker, T. Case, S. Bischoff, O. Cramer, H. Matthäy, U. Strohbusch, G. Pinter, C. N. Pinder, D. S. Armstrong, C. Straßburger, Marcel Kunze, Č. Zupančič, J. Lüdemann, Claude Amsler, S. Resag, C.J. Batty, E. Schäfer, H. Stöck, S. Ravndal, P. Kammel, B.M. Barnett, J. Adomeit, P. Blüm, D.V. Bugg, J. P. Merlo, S. von Dombrowski, M. Lakata, A. Berdoz, P. Illinger, B.S. Zou, H. Kalinowsky, B. Kalteyer, J. Meier, S. Spanier, C. Kolo, R. Hackmann, M. A. Faessler, R.P. Haddock, C.A. Baker, F. Walter, M. Benayoun, Kenneth M. Crowe, P. Schmidt, W. Dünnweber, and R. McCrady
Subjects: Nuclear physics, Physics, Physics and Astronomy (miscellaneous), Meson, Isospin, Zero (complex analysis), High mass, Dalitz plot, Resonance, Atomic physics, Rest frame, Bar (unit)
Abstract: Data on$\bar pp \to \eta \pi ^0 \pi ^0 \pi ^0 $ taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for twoI=0JPC=2−+ resonances inηππ. The first, at 1645±14(stat.)±15(syst.) MeV with width 180−21+40±25 MeV, decays toα2(1320)π withL=0. It may be interpreted as the$q\bar q^1 $D2 partner ofπ2(1670). A strong signal is also observed just above threshold inf2(1270)η withL=0. It is 11–22 times stronger than is expected for the high mass tail of the 1645 MeV resonance. It can be fitted as a second 2−+ resonance at 1875±20±35 MeV with width 200±25±45 MeV. A third resonance havingJPC=2++ is observed at 2135±20±45 MeV withΛ=250±25±45 MeV, decaying to botha2(1320)π andf2(1270)η withL=1. There is no evidence for resonances with decays toa0(980)π, ση orf0(980)η.
Published: 1996
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25. E decays to ηππ in annihilation at rest

Author: R. Bossingham, N. Djaoshvili, K. Beuchert, J. Brose, N. Winter, P. Blüm, D. Jamnik, N.P. Hessey, D. Engelhardt, S. Spanier, C. Kolo, R. Hackmann, M. A. Faessler, D.V. Bugg, R. Ouared, R.P. Haddock, R. Landua, I. Scott, P. Schmidt, Č. Zupančič, F. H. Heinsius, P. Giarritta, Pàl Hidas, C. Völcker, O. Cramer, J. Kisiel, W. Dünnweber, R. McCrady, C. A. Meyer, U. Wiedner, P. Birien, Michael Doser, C. Holzhaußen, M. Schütrumpf, B.S. Zou, E. Schäfer, F. Ould-Saada, Marcel Kunze, K. Braune, C. Regenfus, H. Kalinowsky, K. Peters, T. Case, H. Matthäy, H. Stöck, B. Kalteyer, C.A. Baker, Claude Amsler, M. Englert, A. Cooper, M. Tischhäuser, F. Walter, T. Degener, A. Noble, J. Zoll, M. Herz, M. Benayoun, U. Thoma, Kenneth M. Crowe, D. Urner, Herbert Koch, G. Pinter, B. M. Barnett, D. Walther, J. P. Merlo, U. Strohbusch, C. Straßburger, L. Montanet, J. Lüdemann, C.J. Batty, S. Ravndal, Eberhard Klempt, T. Kiel, H. P. Dietz, C. N. Pinder, S. v. Dombrowski, D. S. Armstrong, M. Lakata, B. Kämmle, P. Illinger, M. Suffert, and R. Seibert
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Angular distribution, Annihilation, Meson, Branching fraction, Isoscalar, Mass spectrum
Abstract: We have observed the ηπ + π − and ηπ 0 π 0 decay modes of the E meson in p p annihilation at rest into π + π − π 0 π 0 η . The mass and width of the E meson are 1409 ± 3 and 86 ± 10 MeV. The production and decay branching ratio is B( p p → Eππ)B(E → ηππ) = (3.3 ± 1.0) × 10 −3 . With a spin-parity analysis we determine that J P = 0 − . The observation of the ηπ 0 π 0 decay mode establishes that E is isoscalar ( C = +1). We find that E decays to η ( ππ ) s (where ( ππ ) s is an S-wave dipion) and πa 0 (980)(→ πη ) with a relative branching ratio of (78 ± 16) %. Using the K K π production and decay branching ratio measured earlier we determine that B[E → K K π] B[E → ηππ] = 0.61 ± 0.19 . A comparison with observations in radiative J Ψ decays suggests that E and ι η (1416) are identical.
Published: 1995
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26. Coupled channel analysis of p annihilation into π0π0π0, π0ηη and π0π0η

Author: R. Ouared, H. Stöck, H. Kalinowsky, Herbert Koch, U. Thoma, Pàl Hidas, P. Giarritta, T. Case, B. Kalteyer, H. Matthäy, B. S. Zou, R. P. Haddock, L. Montanet, B. Kämmle, D. Urner, M. Lakata, N. Djaoshvili, Michael Kobel, K. Braune, S. U. Chung, S. Spanier, C. Kolo, R. Hackmann, P. Blüm, F. H. Heinsius, A. Cooper, C. Felix, J. Brose, D.V. Bugg, C. Holzhaussen, P. Illinger, R. Landua, Claude Amsler, O. Cramer, J. Kisiel, M. Suffert, R. Seibert, E. Schäfer, C.A. Baker, C. Völcker, S. v. Dombroski, C. A. Meyer, P. Schmidt, M. Schütrumpf, Marcel Kunze, W. Dünnweber, M. Herz, F. Walter, F. Ould-Saada, M. Benayoun, R. McCrady, Kenneth M. Crowe, A. Noble, Č. Zupančič, C. Regenfus, P. Birien, T. Degener, D. Walther, J. P. Merlo, U. Strohbusch, C. Straßburger, J. Lüdemann, K. Peters, C.J. Batty, S. Ravndal, U. Wiedner, Michael Doser, M. Tischhäuser, J. Zoll, R. Bossingham, N.P. Hessey, M. A. Faessler, G. Pinter, B. M. Barnett, Eberhard Klempt, T. Kiel, H. P. Dietz, C. N. Pinder, D. S. Armstrong, M. Englert, K. Beuchert, N. Winter, D. Jamnik, and D. Engelhardt
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Dalitz plot, Channel analysis
Abstract: We confirm the existence of the two IG(JPC) = 0+(0++) resonances f0(1370) and f0(1500) reported by us in earlier analyses. The analysis presented here couples the final states π0π0π0, π0π0η and π0ηη of pp annihilation at rest. It is based on a 3 × 3 K-matrix. We find masses and widths of M = (1390±30) MeV, Γ = (380±80) MeV; and M = (1500±10) MeV, Γ = (154 ± 30) MeV, respectively. The product branching ratios for the production and decay into π0π0 and ηη of the f0(1500) are (1.27 ± 0.33) · 10−3 and (0.60 ± 0.17) · 10−3, respectively.
Published: 1995
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27. First observation of the production of nucleon resonances in antiproton annihilation in liquid deuterium

Author: N. Djaoshvili, U. Thoma, Eberhard Klempt, T. Kiel, H. P. Dietz, D. Urner, J. Kisiel, C.J. Batty, P. Giarritta, F. H. Heinsius, C. N. Pinder, S. v. Dombrowski, D. S. Armstrong, N.P. Hessey, U. Wiedner, H. Matthaey, J. Lüdemann, P. Schmidt, M. Suffert, R. Seibert, M. Lakata, F. Ould-Saada, M. Merkel, Michael Doser, J. Zoll, W. Dünnweber, C. Holzhaussen, B. S. Zou, R. McCrady, U. Strohbusch, D. Walther, C. Straßburger, M. A. Faessler, C. Felix, T. Degener, H. Koch, R. Landua, Mark J. Burchell, K. Braune, I. Augustin, C. Völcker, P. Illinger, T. Gemesy, P. Birien, A. Cooper, L. Montanet, J. Brose, B. Kämmle, Pàl Hidas, Krisztian Peters, Marcel Kunze, R. Ouared, M. Tischhäuser, C. A. Meyer, B.M. Barnett, M. Herz, R. Bossingham, A. Noble, C. Regenfus, T. Case, Claude Amsler, Č. Zupančič, Michael Kobel, J. P. Merlo, K. Königsmann, P. Blüm, D.V. Bugg, H. Stöck, B. Kalteyer, H. Kalinowsky, S. Spanier, C. Kolo, R. Hackmann, O. Cramer, E. Schäfer, S. Resag, C.A. Baker, F. Walter, M. Benayoun, Kenneth M. Crowe, S. Ravndal, R. P. Haddock, K. Beuchert, N. Winter, D. Jamnik, D. Engelhardt, and M. Englert
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Deuterium, Antiproton, Nucleon, Particle Physics - Experiment
Published: 1995
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28. η-decays into three pions

Author: J. Kisiel, W. Dünnweber, R. McCrady, C. Felix, Pàl Hidas, J. P. Merlo, P. Birien, K. Königsmann, K. Braune, Bernhard Schmid, K. Beuchert, N. Winter, D. Jamnik, D. Engelhardt, M. Suffert, R. Seibert, D. Urner, A. Cooper, J. Salk, H. Stöck, C.J. Batty, B. Kämmle, U. Thoma, Mark J. Burchell, F. H. Heinsius, C. Völcker, U. Wiedner, F. Ould-Saada, Claude Amsler, Michael Doser, P. Blüm, Herbert Koch, I. Augustin, M. A. Faessler, S. Ravndal, D.V. Bugg, R.P. Haddock, K. Peters, Marcel Kunze, D. Walther, C. Regenfus, R. Hackmann, T. Degener, M. Herz, G. Folger, Michael Kobel, U. Strohbusch, C. Straßburger, M. Lakata, C. A. Meyer, M. Englert, Č. Zupančič, J. Zoll, B. M. Barnett, J. Lüdemann, H. Kalinowsky, A. Noble, P. Illinger, O. Cramer, R. Landua, S. Spanier, E. Schäfer, T. Case, H. Matthäy, B.S. Zou, M. Tischhäuser, R. Bossingham, C.A. Baker, F. Walter, G. Pinter, Kenneth M. Crowe, J. Brose, L. Montanet, C. N. Pinder, S. v. Dombrowski, C. Kolo, D. S. Armstrong, M. Merkel, Eberhard Klempt, T. Kiel, H. P. Dietz, R. Glantz, Nigel Hessey, and P. Schmidt
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Crystallography, Chiral perturbation theory, Pion, Partial width, Mass spectrum, Dalitz plot
Abstract: The branching ratios Γ(η → 3π 0 ) Γ(η → π + π − π 0 ) = 1.44 ± 0.09 ± 0.10 and Γ(η → γγ) Γ(η → π + π − π 0 ) = 1.78 ± 0.10 ± 0.13 have been determined using the Crystal Barrel detector at LEAR. The latter ratio yields a partial width of Γ ( η → π + π − π 0 ) = 0.26 ± 0.03 keV using the known value for Γ ( η → γγ ). The η → π + π − π 0 ) Dalitz plot is compared to the predictions of chiral perturbation theory.
Published: 1995
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29. Observation of radiative annihilation into a Φ meson

Author: C.A. Baker, C. Felix, F. Walter, C. A. Meyer, U. Thoma, A. Cooper, H. Stöck, F. H. Heinsius, Kenneth M. Crowe, M. Englert, A. Noble, J. Brose, M. A. Faessler, K. Beuchert, R.P. Haddock, B. Kämmle, K. Braune, C. Kolo, T. Case, H. Matthäy, N. Winter, D. Jamnik, D. Engelhardt, G. Pinter, R. Landua, B. M. Barnett, P. Schmidt, H. Kalinowsky, Mark J. Burchell, S. Spanier, L. Montanet, M. Suffert, R. Seibert, W. Dünnweber, O. Cramer, Claude Amsler, R. McCrady, R. Bossingham, F. Ould-Saada, Herbert Koch, E. Schäfer, C. Regenfus, Č. Zupančič, P. Birien, C. Völcker, Pàl Hidas, Marcel Kunze, M. Tischhäuser, T. Degener, M. Herz, J. P. Merlo, B. S. Zou, P. Illinger, J. Kisiel, K. Königsmann, P. Blüm, D. Urner, D.V. Bugg, R. Hackmann, M. Lakata, J. Zoll, Michael Kobel, Eberhard Klempt, T. Kiel, H. P. Dietz, I. Augustin, C. N. Pinder, K. Peters, S. v. Dombrowski, D. S. Armstrong, M. Merkel, U. Wiedner, Michael Doser, C.J. Batty, S. Ravndal, D. Walther, U. Strohbusch, C. Straßburger, J. Lüdemann, and Nigel Hessey
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Meson, Antiproton, Branching fraction, Radiative transfer, Analytical chemistry
Abstract: The annihilation p p → Φγ has been investigated with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The observed branching ratio BR ( p p → Φγ = (1.7 ± 0.4) · 10 −5 is almost two orders of magnitude higher than expected from the OZI-rule. As a by-product, the branching ratios BR ( p p → K L K S ) = (9.0 ± 0.6) · 10 −4 and BR ( p p → Φπ 0 ) = (5.5 ± 0.7) · 10 −4 have been measured.
Published: 1995
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30. High-statistics study of f0(1500) decay into π0π0

Author: C. Völcker, H. Kalinowsky, L. Montanet, B. Kämmle, Marcel Kunze, C. Kolo, Nigel Hessey, J. Kisiel, O. Cramer, C.A. Baker, R. Hackmann, C. A. Meyer, P. Blüm, Claude Amsler, M. Lakata, F. Walter, E. Schäfer, M. Suffert, R. Seibert, U. Wiedner, F. H. Heinsius, T. Case, H. Matthäy, Kenneth M. Crowe, R. Landua, Michael Doser, K. Beuchert, F. Ould-Saada, J. P. Merlo, P. Schmidt, J. Zoll, S. Spanier, K. Königsmann, A. Noble, H. Stöck, M. A. Faessler, W. Dünnweber, Herbert Koch, N. Winter, G. Pinter, T. Degener, M. Herz, B.M. Barnett, U. Thoma, K. Braune, S. U. Chung, D. Jamnik, R. Bossingham, Č. Zupančič, F. Loser, Mark J. Burchell, D. Engelhardt, D. Urner, C. Regenfus, C. Felix, K. Peters, Michael Kobel, P. Birien, Pàl Hidas, R. P. Haddock, M. Englert, C. N. Pinder, S. v. Dombrowski, D. S. Armstrong, M. Merkel, D. Walther, U. Strohbusch, C. Straßburger, J. Lüdemann, J. Brose, C.J. Batty, I. Augustin, S. Ravndal, Eberhard Klempt, T. Kiel, H. P. Dietz, J. Salk, and P. Illinger
Subjects: Data set, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Partial wave analysis, Scalar (mathematics), Dalitz plot, Resonance (particle physics)
Abstract: A partial-wave analysis of the reaction p p →π 0 π 0 π 0 has been performed using a high-quality high-statistics data set of 712 000 events. In addition to the f0(975) and f0(1300), the scalar resonance with mass m = (1500 ± 15) MeV and width Γ = (120 ± 25) MeV is necessary to describe the data.
Published: 1995
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31. Measurement of muon capture on the proton to 1% precision and determination of the pseudoscalar coupling gP

Author: G. G. Semenchuk, O. Maev, Malte Hildebrandt, J. Egger, G. N. Schapkin, Françoise Mulhauser, T. I. Banks, V. A. Andreev, M. A. Soroka, V. Tishchenko, G. E. Petrov, V.A. Ganzha, T. Case, E. M. Maev, An.A. Vorobyov, P. Kravtsov, C. Petitjean, A. G. Krivshich, F. Gray, Stuart J. Freedman, M. Vznuzdaev, Bernhard Lauss, R. M. Carey, S. Knaack, T. P. Gorringe, K. R. Lynch, A. A. Vasilyev, Kenneth M. Crowe, S. M. Clayton, P. Winter, David W. Hertzog, René Prieels, B. Kiburg, Jules Deutsch, and P. Kammel
Subjects: Physics, Time projection chamber, Muon, Proton, Physics::Instrumentation and Detectors, General Physics and Astronomy, FOS: Physical sciences, Electron, High Energy Physics - Experiment, Muon capture, Nuclear physics, High Energy Physics - Experiment (hep-ex), Double beta decay, Atom, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Atomic physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Exotic atom
Abstract: The MuCap experiment at the Paul Scherrer Institute has measured the rate L_S of muon capture from the singlet state of the muonic hydrogen atom to a precision of 1%. A muon beam was stopped in a time projection chamber filled with 10-bar, ultra-pure hydrogen gas. Cylindrical wire chambers and a segmented scintillator barrel detected electrons from muon decay. L_S is determined from the difference between the mu- disappearance rate in hydrogen and the free muon decay rate. The result is based on the analysis of 1.2 10^10 mu- decays, from which we extract the capture rate L_S = (714.9 +- 5.4(stat) +- 5.1(syst)) s^-1 and derive the proton's pseudoscalar coupling g_P(q^2_0 = -0.88 m^2_mu) = 8.06 +- 0.55., Comment: Updated figure 1 and small changes in wording to match published version
Published: 2012

32. ηη′ threshold enhancement in p̄p annihilations into π0ηη′ at rest

Author: R. Bossingham, M. Suffert, R. Seibert, C. N. Pinder, S. v. Dombrowski, D. S. Armstrong, F. Loser, Claude Amsler, U. Wiedner, M. Merkel, C.A. Baker, Michael Doser, F. H. Heinsius, I. Augustin, P. Schmidt, W. Dünnweber, J. P. Merlo, K. Peters, K. Königsmann, R. Hackmann, A. Cooper, C.J. Batty, F. Walter, Herbert Koch, Michael Kobel, P. Blüm, D.V. Bugg, M. Lakata, H. Kalinowsky, R. P. Haddock, Kenneth M. Crowe, B. M. Barnett, B. S. Zou, O. Cramer, M. A. Faessler, E. Schäfer, Eberhard Klempt, S. Ravndal, Mark J. Burchell, M. Englert, T. Kiel, H. P. Dietz, D. Walther, R. Landua, C. A. Meyer, C. Kolo, U. Strohbusch, Pàl Hidas, L. Montanet, B. Kämmle, Nigel Hessey, K. Beuchert, A. Noble, J. Lüdemann, N. Winter, P. Illinger, D. Jamnik, D. Engelhardt, J. Salk, J. Brose, K. Braune, S. U. Chung, T. Case, H. Matthäy, P. Birien, S. Spanier, C. Straβburger, G. Pinter, C. Völcker, Marcel Kunze, Č. Zupančič, D. Urner, C. Felix, J. Kisiel, F. Ould-Saada, T. Degener, M. Herz, and J. Zoll
Subjects: Physics, Rest (physics), Nuclear and High Energy Physics, Particle physics, Dalitz plot
Abstract: We report on the observation of an ηη′ threshold enhancement produced in pp annihilations at rest into π0ηη′, which we identify with the recently discovered ƒ 0 (1500) .
Published: 1994
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33. Hidden and open $$\bar ss$$ production in $$\bar pp$$ annihilation at restannihilation at rest

Author: A. H. Sanjari, D. Walther, K. Beuchert, R. Hackmann, J. Zoll, N. Winter, U. Strohbusch, P. Blüm, D. Jamnik, D. Engelhardt, C.A. Baker, F. Walter, Kenneth M. Crowe, Pàl Hidas, C. Kolo, J. Lüdemann, C. A. Meyer, D.V. Bugg, P. Birien, I. Augustin, S. Spanier, K. Peters, B. Schmid, G. Pinter, T. Case, B. Kämmle, James A. Bistirlich, T. Kiel, J. Salk, J. P. Merlo, K. Braune, B. M. Barnett, R. P. Haddock, C.J. Batty, L. Montanet, R. Bossingham, K. Königsmann, M. Englert, A. Noble, M. Suffert, F. H. Heinsius, U. Wiedner, R. Landua, C. Völcker, P. Schmidt, A. Cooper, Michael Doser, S. Ravndal, Mark J. Burchell, Marcel Kunze, W. Dünnweber, Claude Amsler, M. A. Faessler, Herbert Koch, H. Matthaey, Nigel Hessey, J. Brose, S. v. Dombrowski, D. S. Armstrong, M. Merkel, Eberhard Klempt, H. P. Dietz, Z. Jávorfi, F. Ould-Saada, C. Straßburger, G. Folger, C. Felix, Michael Kobel, D. Urner, J. Kisiel, H. Bossy, H. Kalinowsky, O. Cramer, E. Schäfer, Č. Zupančič, and P. Illinger
Subjects: Nuclear physics, Physics, Particle physics, Annihilation, OZI rule, High Energy Physics::Phenomenology, Dalitz plot, High Energy Physics::Experiment
Abstract: New branching ratios for$\bar pp$ annihilation at rest into final states with a$K\bar K$ pair or φ-meson are being measured with the Crystal Barrel detector at LEAR. The yield of φγ, relative to ωγ, appears to violate the OZI rule as strongly as φπ relative to ωπ.
Published: 1994
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34. High-statistics analysis of $$\bar pp \to \pi ^0 \pi ^0 \pi ^0 $$ at restat rest

Author: L. Montanet, U. Meyer-Berkhout, Mark J. Burchell, C.J. Batty, B. Schmid, G. Pinter, T. Case, R. Bossingham, A. H. Sanjari, K. Braune, J. Zoll, C. Kolo, M. Suffert, S. Ravndal, K. Beuchert, Claude Amsler, C.A. Baker, R. Hackmann, F. Walter, D. Walther, N. Winter, P. Birien, I. Augustin, Kenneth M. Crowe, M. A. Faessler, D. Jamnik, U. Strohbusch, F. H. Heinsius, C. Völcker, K. Peters, D. Engelhardt, Pàl Hidas, H. Matthaey, H. Kalinowsky, C. A. Meyer, James A. Bistirlich, P. Schmidt, O. Cramer, J. Lüdemann, R. P. Haddock, W. Dünnweber, A. Noble, E. Schäfer, J. Salk, Marcel Kunze, U. Wiedner, R. Landua, Herbert Koch, Michael Doser, S. Spanier, B. Kämmle, P. Illinger, A. Cooper, M. Englert, B. M. Barnett, Nigel Hessey, J. P. Merlo, K. Königsmann, P. Blüm, D.V. Bugg, T. Kiel, G. Folger, Michael Kobel, Č. Zupančič, J. Kisiel, C. Felix, H. Bossy, Z. Jávorfi, C. Straßburger, J. Brose, Eberhard Klempt, H. P. Dietz, D. Urner, S. v. Dombrowski, and M. Merkel
Subjects: Nuclear physics, Rest (physics), Physics, Particle physics, Annihilation, Amplitude, Pi, Dalitz plot, Invariant (mathematics), Nuclear Experiment, Resonance (particle physics), Bar (unit)
Abstract: Antiproton-proton annihilation at rest into 3π0 is analysed based on a data sample of about 500 000 high-quality 3π0 events. In this high-statistics Dalitz plot two structures in the region of π0π0 invariant masses of about 1500 MeV show up, a small band and a blob at higher masses. In a first attempt to describe the data two different models are used to parametrize the dynamical amplitudes leading to the same conclusion: the data require a 0+ + and also a 2+ + resonance in the 1500 MeV region.
Published: 1994
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35. Test of chiral perturbation theory in η decays

Author: R. Bossingham, C. A. Meyer, J. Lüdemann, R. P. Haddock, A. Noble, A. Cooper, M. A. Faessler, A. H. Sanjari, T. Case, B. Schmid, H. Matthäy, G. Pinter, K. Braune, J. Zoll, C. Felix, B. M. Barnett, P. Schmidt, D. Walther, Eberhard Klempt, G. Folger, L. Montanet, W. Dünnweber, James A. Bistirlich, H. P. Dietz, Michael Kobel, Pàl Hidas, C.A. Baker, D. Umer, Claude Amsler, M. Suffert, I. Augustin, F. Walter, R. Hackmann, S. v. Dombrowski, D. S. Armstrong, P. Birien, Kenneth M. Crowe, M. Merkel, H. Kalinowski, Č. Zupančič, Z. Jávorfi, B. Kämmle, K. Beuchert, C. Kolo, F. Ould-Saada, C. Straßburger, D. Jamnik, P. Illinger, N. P. Hessey, D. Engelhardt, J. Brose, F. H. Heinsius, C. Völcker, U. Wiedner, Michael Doser, Mark J. Burchell, J. P. Merlo, M. Englert, Marcel Kunze, K. Königsmann, T. Kiel, J. Kisiel, H. Bossy, S. Ravndal, P. Blüm, D.V. Bugg, J. Salk, S. Waßmer, C.J. Batty, H. Koch, U. Strohbusch, R. Landua, E. Schäfer, and Krisztian Peters
Subjects: Quantum chromodynamics, Crystal, Nuclear physics, Physics, Particle physics, Chiral perturbation theory, Pion, Partial width, Order (group theory), Charged particle
Abstract: The decay of the η-meson into three pions plays an important role as a test of low-energy QCD calculations in the framework of chiral perturbation theory. Previous experiments show results that are inconclusive or even contradictory. The Crystal Barrel experiment at LEAR has determined the braching ratiosΓ(η→3π0)/Γ(η→π+π−π0)=1.47±0.09±0.15 andΓ(η→γγ)/Γ(η→π+π−π0)=1.88±0.10±0.17 using its unique features to detect charged particles as well as neutral particles. The value for the first ratio agrees nicely with the theoretical predictions and solves previous experimental uncertainties. The second value, which yields a partial width ofΓ(η→π+π−π0)=(0.24±0.03) keV, shows that the same next-to-leading order chiral perturbation theory calculations still have some problems.
Published: 1994
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36. $$\bar pp$$ Annihilation at rest into K L 0 K S 0 π0π0Annihilation at rest into K L 0 K S 0 π0π0

Author: Faessler, D. Walther, G. Folger, Michael Kobel, E. Schaefer, R. Hackmann, U. Strohbusch, P. Schmidt, W. Dünnweber, J. P. Merlo, K. Braune, P. Birien, H. Kalinowsky, Eberhard Klempt, Mark J. Burchell, Michael Doser, H. P. Dietz, J. Brose, I. Augustin, Farid Ould-Saada, R. Bossingham, B. Schmid, C.J. Batty, C. Kolo, G. Pinter, U. Wiedner, M. Suffert, K. Peters, F. H. Heinsius, C. N. Pinder, R. Landua, S. Spanier, S. von Dombrowski, D. S. Armstrong, B. M. Barnett, P. Blüm, Pàl Hidas, M. Englert, M. Merkel, O. Cramer, S. Ravndal, Claude Amsler, C.A. Baker, D.V. Bugg, Herbert Koch, L. Montanet, B. Kaemmle, A. H. Sanjari, J. Zoll, F. Walter, C. A. Meyer, K. Beuchert, T. Case, Kenneth M. Crowe, Marcel Kunze, A. Noble, N. Winter, D. Jamnik, D. Engelhardt, P. Illinger, A. Cooper, Kay Konigsmann, R.P. Haddock, H. Matthaey, C. Voelcker, J. Salk, Nigel Hessey, J. Luedemann, T. Kiel, C. Strassburger, Z. Jávorfi, J. Kisiel, Č. Zupančič, H. Bossy, D. Urner, and C. Felix
Subjects: Physics, Rest (physics), Nuclear physics, Particle physics, Annihilation, Hadron spectroscopy, Partial wave analysis
Published: 1994
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37. Antiproton annihilation at rest in liquid deuterium into π−π0π0pS

Author: Pàl Hidas, M. Suffert, C. Kolo, Nigel Hessey, J. Brose, T. Kiel, B. Schmid, M. A. Faessler, R. Bossingham, G. Pinter, U. Meyer-Berkhout, R. Hackmann, U. Wiedner, H. Matthaey, Eberhard Klempt, Michael Doser, R. Landua, C.J. Batty, P. Schmidt, P. Illinger, A. H. Sanjari, J. Zoll, H. P. Dietz, C.A. Baker, L. Montanet, J. P. Merlo, S. v. Dombrowski, F. Walter, K. Königsmann, W. Dünnweber, S. Ravndal, J. Kisiel, C. A. Meyer, D. Walther, Kenneth M. Crowe, M. Merkel, I. Augustin, A. Cooper, H. Bossy, U. Strohbusch, K. Peters, B. Kämmle, Mark J. Burchell, R. P. Haddock, K. Braune, S. Spanier, A. Noble, J. Lüdemann, H. Kalinowsky, Herbert Koch, P. Birien, D. Urner, F. H. Heinsius, C. Völcker, E. Schäfer, Z. Jávorfi, C. Straßburger, Marcel Kunze, Claude Amsler, James A. Bistirlich, T. Case, G. Folger, Michael Kobel, P. Blüm, C. Felix, D.V. Bugg, Č. Zupančič, M. Englert, B. M. Barnett, K. Beuchert, N. Winter, D. Jamnik, and D. Engelhardt
Subjects: Nuclear physics, Physics, Crystal, Annihilation, Deuterium, Antiproton, Partial wave analysis, Resonance, Dalitz plot, Atomic physics, Parametrization
Abstract: With the Crystal Barrel detector, the final state π−π0π0pS at rest in liquid deuterium was measured for the first time. A preliminary partial-wave analysis was performed, which required two interesting features: besides the ρ(770), a second pole was needed in the ππP-wave and a narrow resonance in the ππS-wave, slightly above 1500 MeV/c2. With the same parametrization a high-statistics π+π−π0 data set could also be well described.
Published: 1994
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38. Observation of a new IG(JPC)=1−(0++) resonance at 1450 MeV

Author: P. Schmidt, W. Dünnweber, C. Felix, U. Wiedner, Michael Doser, B. S. Zou, Eberhard Klempt, D. Urner, C. Kolo, L. Montanet, B. Kämmle, F. Loser, I. Augustin, T. Kiel, H. P. Dietz, C.J. Batty, Pàl Hidas, K. Peters, J. P. Merlo, R. Hackmann, J. Kisiel, C.A. Baker, A. V. Sarantsev, F. H. Heinsius, S. Ravndal, Herbert Koch, V. V. Anisovich, M. Suffert, D. Walther, J. Zoll, F. Walter, U. Strohbusch, G. Pinter, K. Königsman, Mark J. Burchell, Kenneth M. Crowe, Michael Kobel, J. Lüdemann, A. Cooper, J. Brose, S. von Dombrowski, B. M. Barnett, F. Ould-Saada, C. A. Meyer, Č. Zupančič, S. Spanier, P. Blüm, H. Kalinowsky, C. N. Pinder, A. Noble, R. Landua, D. S. Armstrong, T. Degener, M. Herz, D.V. Bugg, M. Merkel, P. Illinger, E. Schäfer, J. Salk, Nigel Hessey, C. Völcker, Marcel Kunze, C. Straβburger, R. Bossingham, Claude Amsler, K. Braune, S. U. Chung, M. A. Faessler, T. Case, H. Matthäy, M. Englert, P. Birien, R. P. Haddock, K. Beuchert, N. Winter, D. Jamnik, and D. Engelhardt
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Partial wave analysis, Resonance, Dalitz plot, Elementary particle, Quantum number
Abstract: A new IG=1− JPC=0++πη resonance is observed in pp annihilation at rest into π0π0η. It has a mass M=(1450±40)MeV and a width Γ=(270±40)MeV.
Published: 1994
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39. Search for a new light gauge boson in decays of π0 and η

Author: F. H. Heinsius, A. Cooper, G. Pinter, Č. Zupančič, B. S. Zou, L. Montanet, S. von Dombrowski, D. Urner, C. Felix, M. Suffert, Pàl Hidas, T. Case, B. Kämmle, H. Matthäy, Z. Jávorfi, P. Blüm, F. Ould-Saada, Claude Amsler, D.V. Bugg, J. Salk, R. Hackmann, T. Degener, C. A. Mever, D. Walther, R. Bossingham, J. Kisiel, Mark J. Burchell, N. Winter, U. Strohbusch, P. Birien, C. Kolo, J. Lüdemann, Michael Kobel, K. Beuchert, C.J. Batty, D. Jamnik, D. Engelhardt, B. M. Barnett, S. Ravndal, C.A. Baker, K. Braune, H. Kalinowsky, F. Walter, J. P. Merlo, M. Englert, K. Königsmann, R. Landua, Kenneth M. Crowe, E. Schäfer, J. Brose, Eberhard Klempt, T. Kiel, H. P. Dietz, C. N. Pinder, D. S. Armstrong, A. Noble, M. Merkel, J. Zoll, Herbert Koch, P. Illinger, I. Augustin, P. Schmidt, K. Peters, W. Dünnweber, A. H. Sanjari, M. A. Faessler, R.P. Haddock, Bernhard Schmid, F. Loser, U. Wiedner, Michael Doser, C. Völcker, Marcel Kunze, C. Straβburger, S. Spanier, N. P. Hessey, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and CRYSTAL BARREL
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Gauge boson, Particle physics, Photon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Branching fraction, Elementary particle, 01 natural sciences, Upper and lower bounds, Nuclear physics, Particle decay, Photon emission, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Particle Physics - Experiment
Abstract: We have searched for new light gauge bosons produced in π 0 and η decays by studying the kinematically well-constrained reactions p p→π 0 π 0 π 0 and p p→π 0 π 0 η , where one π 0 or the η decays through the emission of a single photon recoiling against a missing state X (where X is a long-lived weakly interacting particle or X →ν ν ). No signal has been observed and branching ratio upper limits of 6 × 10 −5 at 90% C.L. have been obtained for masses of the gauge boson lying between ∼65 MeV and 125 MeV ( π 0 decay), and 6 × 10 −5 at 90% C.L. for X masses between ∼200 MeV and 525 MeV (η decay). The π 0 -decay limit represents a factor of 4 to 8 improvement when compared to the existing limit, whereas the η decay limit has been measured for the first time, thereby extending the m x range from 130 MeV up to 525 MeV.
Published: 1994
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40. Projectile rapidity pions in 775 MeV/nucleonLa139+12C andLa139+139La reactions

Author: James A. Bistirlich, O. Yamakawa, M. Justice, Osamu Hashimoto, Isao Tanihata, K. Nakayama, T. Kobayashi, Y. W. Xu, T. J. Humanic, Kenneth M. Crowe, S. Nagamiya, Y. Shida, N. Yoshikawa, Hideki Hamagaki, and J. O. Rasmussen
Subjects: Physics, Nuclear reaction, Nuclear physics, Nuclear and High Energy Physics, Pion, Meson, Projectile, Nuclear Theory, Hadron, Rapidity, Impact parameter, Nuclear Experiment, Nucleon
Abstract: Negative pion spectra emitted in the reactions of 775 MeV/nucleon [sup 139]La+[sup 12]C and [sup 139]La+[sup 139]La reactions have been measured in coincidence with the projectile fragments using the HISS spectrometer at the Bevalac. Prominent peaks near the beam velocity were observed in the pion spectra. Position and widths of the peaks were studied as a function of the sum charge'' of projectile fragments which is a good measure of impact parameter; the smaller the sum charge,'' the smaller the impact parameter. The peak position down shifts with the smaller sum charge.'' The pion peak is wider in the transverse than in the longitudinal direction, possibly mirroring the velocity dispersions of projectile fragments in the early stage of reactions.
Published: 1994
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41. Protonium annihilation into KL0KL0π0 and KL0KS0η

Author: F. H. Heinsius, C. Völcker, Nigel Hessey, J. P. Merlo, R. Bossingham, C. N. Pinder, K. Königsmann, Pàl Hidas, Marcel Kunze, M. Suffert, P. Illinger, K. Braune, R. Hackmann, K. Beuchert, D. S. Armstrong, L. Montanet, N. Winter, T. Kiel, B. Kämmle, D. Jamnik, D. Engelhardt, C. Felix, D. Urner, H. Kalinowsky, M. Merkel, D. Walther, A. Cooper, S. von Dombrowski, P. Birien, C.A. Baker, M. Englert, E. Schäfer, S. Spanier, Eberhard Klempt, H. P. Dietz, F. Walter, P. Blüm, R. Glantz, Kenneth M. Crowe, Č. Zupančič, D.V. Bugg, Claude Amsler, J. Kisiel, U. Strohbusch, T. Case, H. Matthäy, G. Folger, Herbert Koch, Michael Kobel, C. Kolo, J. Brose, Z. Jávorfi, J. Lüdemann, F. Ould-Saada, C. Straßburger, A. H. Sanjari, J. Zoll, B. M. Barnett, T. Degener, G. Pinter, R. Landua, I. Augustin, K. Peters, C.J. Batty, C. A. Meyer, S. Ravndal, A. Noble, U. Wiedner, J. Salk, Michael Doser, Mark J. Burchell, B. S. Zou, M. A. Faessler, R.P. Haddock, P. Schmidt, W. Dünnweber, and Bernhard Schmid
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Amplitude, 010308 nuclear & particles physics, Protonium, 0103 physical sciences, Resonance, Elementary particle, 010306 general physics, 01 natural sciences
Abstract: The annihilation of pp at rest into KL0KS0π0 and KL0KS0η was investigated with the Crystal Barrel detector at LEAR. These final states with negative C-parity are dominated by φ and K0∗ resonances. The ratios of the branching ratios are B(pp→φπ0)B(pp→φη)=8.3±2.1 and B(pp→K0K0∗+K0K0∗→KL0KS0π0)B(pp→φπ0→KL0KS0π0)= 2.04±0.21.
Published: 1993
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42. Antiproton-proton annihilation at rest into ωπ0π0

Author: L. Montanet, Herbert Koch, R. Hackmann, P. Schmidt, I. Augustin, F. H. Heinsius, D. Walther, C. Völcker, Mark J. Burchell, K. Peters, C. A. Meyer, U. Strohbusch, S. v. Dombrowski, D. S. Armstrong, James A. Bistirlich, Marcel Kunze, W. Dünnweber, A. Cooper, M. Merkel, Z. Jávorfi, J. Lüdemann, M. Suffert, A. Noble, C. Felix, C. Straßburger, J. Brose, T. Kiel, B. Schmid, Eberhard Klempt, G. Folger, P. Illinger, G. Pinter, H. P. Dietz, Michael Kobel, Michael Doser, A. H. Sanjari, B. Kämmle, J. Zoll, B. M. Barnett, Pàl Hidas, S. M. Spanier, J. Salk, E. Schäfer, C.J. Batty, Farid Ould-Saada, J. Kisiel, H. Bossy, M. A. Faessler, K. Beuchert, S. Ravndal, R.P. Haddock, N. Winter, D. Urner, D. Jamnik, H. Matthaey, D. Engelhardt, M. Englert, Nigel Hessey, Č. Zupančič, R. Bossingham, U. Wiedner, K. Braune, R. Landua, S. U. Chung, T. Case, H. Kalinowsky, C.A. Baker, J. P. Merlo, K. Königsmann, F. Walter, Kenneth M. Crowe, P. Blüm, Claude Amsler, D.V. Bugg, C. Kolo, and P. Birien
Subjects: Rest (physics), Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Proton, Antiproton
Published: 1993
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43. Radiative protonium annihilation into γγ, γπ0, γη, γω and γη′

Author: B. M. Barnett, R. Landua, L. Montanet, A. Cooper, M. Suffert, H. Kalinowsky, T. Case, J. Kisiel, J. Brose, H. Bossy, E. Schäfer, P. Blüm, Nigel Hessey, B. Kämmle, C. Kolo, S. v. Dombrowski, D. S. Armstrong, Z. Jávorfi, G. Pinter, M. Merkel, D.V. Bugg, F. Ould-Saada, C. Straßburger, P. Birien, C.A. Baker, Eberhard Klempt, H. P. Dietz, Claude Amsler, J. P. Merlo, S. Spanier, K. Königsmann, F. Walter, D. Urner, T. Kiel, P. Illinger, D. Walther, Kenneth M. Crowe, R. Bossingham, F. H. Heinsius, U. Strohbusch, C. Völcker, Herbert Koch, G. Folger, Marcel Kunze, Michael Kobel, Č. Zupančič, C. Felix, J. Lüdemann, K. Braune, S. U. Chung, C. A. Meyer, S. Waßmer, A. Noble, U. Wiedner, Michael Doser, I. Augustin, K. Peters, C.J. Batty, S. Ravndal, A. H. Sanjari, J. Zoll, James A. Bistirlich, P. Schmidt, W. Dünnweber, M. A. Faessler, R.P. Haddock, H. Matthaey, Bernhard Schmid, M. Englert, J. Salk, K. Beuchert, R. Hackmann, N. Winter, D. Jamnik, D. Engelhardt, Pàl Hidas, and Mark J. Burchell
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, Antiproton, Branching fraction, 0103 physical sciences, Radiative transfer, 010306 general physics, 01 natural sciences
Abstract: Radiative p p annihilation at rest into γγ , γπ 0 , γη , γω and γη′ has been measured with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The branching ratios are B γπ 0 =(44±4)×10 −6 , B γη =(9.3±1.4)×10 −6 and B γω =(68±18)×10 −6 , respectively. For B γγ and B γη ′ we find new upper limits of 0.63×10 −6 and 12×10 −6 (95% CL), respectively.
Published: 1993
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44. Muon-catalyzedptfusion

Author: C. Petitjean, M. Fuchs, N. Nägele, H. Bossy, von Egidy T, Kenneth M. Crowe, R. Lipowsky, K. Lou, P. Baumann, Wolfgang Schott, Johann Marton, Manfred Jeitler, J. Werner, J. Zmeskal, P. Kammel, W. H. Breunlich, R. H. Sherman, F. J. Hartmann, P. Ackerbauer, E. Moser, H. Daniel, S. Grunewald, and V. E. Markushin
Subjects: Physics, Light nucleus, Crystallography, Muon, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, General Physics and Astronomy, Atomic physics, Formation rate
Abstract: Gamma rays and, for the first time, conversion muons of [ital pt] fusion have been measured from liquid mixtures of protium, deuterium, and tritium. The rate [lambda][sub 10] for spin flip from the triplet to the singlet state of [ital t][mu](1[ital s]) was found to be [lambda][sub 10]=(1.06[plus minus]0.13)[times]10[sup 3][mu][ital s][sup [minus]1], the rate for muon-catalyzed [ital pt] fusion from the ([ital I]=1) nuclear-spin state to be [lambda][sub [ital p][ital t]][sup [ital f]]([ital I]=1) =0.067[plus minus]0.002[sub [minus]0.002][sup +0.005][mu][ital s][sup [minus]1], and the and the molecular formation rate to be [lambda][sub [ital p][ital t]][sup [ital m]]=(7.5[plus minus]0.3[sub [minus]0.3][sup +1.0])[mu][ital s][sup [minus]1] (all rates normalized to liquid hydrogen density).
Published: 1993
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45. Antiproton-proton annihilation at rest into two mesons

Author: C. A. Meyer, A. Noble, U. Meyer-Berkhout, B. Schmid, R. P. Haddock, T. Case, P. Schmidt, A. H. Sanjari, G. Pinter, D. Walther, K. Beuchert, J. Zoll, N. Winter, D. Jamnik, D. Engelhardt, W. Dünnweber, Claude Amsler, J. Brose, B. M. Barnett, M. Englert, C.A. Baker, U. Strohbusch, D. Urner, R. Hackmann, M. Suffert, J. Lüdemann, A. Cooper, F. Walter, Herbert Koch, P. Blüm, H. Kalinowsky, K. Peters, C.J. Batty, J. Kisiel, Mark J. Burchell, R. Landua, M. A. Faessler, D.V. Bugg, H. Bossy, E. Schäfer, James A. Bistirlich, Pàl Hidas, U. Wiedner, Kenneth M. Crowe, Michael Doser, S. v. Dombrowski, G. Folger, I. Augustin, Michael Kobel, K. Braune, S. U. Chung, M. Merkel, S. Ravndal, J. P. Merlo, L. Montanet, S. Spanier, B. Kämmle, K. Königsmann, Nigel Hessey, P. Illinger, C. Kolo, P. Birien, F. H. Heinsius, Eberhard Klempt, C. Völcker, H. P. Dietz, Marcel Kunze, T. Kiel, H. Matthaey, R. Bossingham, Z. Jávorfi, C. Straßburger, Č. Zupančič, and C. Felix
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Antiproton, Radiative transfer, High Energy Physics::Experiment, Nuclear Experiment, Liquid hydrogen
Abstract: Branching ratios for antiproton-proton annihilations at rest into two mesons are given. The data were obtained at LEAR by stopping antiprotons in a liquid hydrogen target. Both charged and neutral annihilation products were detected in the Crystal Barrel detector. Representative data are presented, and their bearing on the general picture of annihilation dynamics is discussed. In addition, preliminary branching ratios for two-body radiative annihilations are given.
Published: 1993
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46. P- versus S-wave at rest in LH2

Author: C. Felix, A. Cooper, F. H. Heinsius, Herbert Koch, M. Suffert, C. Völcker, A. H. Sanjari, Marcel Kunze, D. Urner, Pàl Hidas, Č. Zupančič, G. Folger, Michael Kobel, H. Kalinowsky, C. A. Meyer, Bernhard Schmid, D. Walther, J. Zoll, Eberhard Klempt, Nigel Hessey, James A. Bistirlich, J. Brose, H. P. Dietz, J. Kisiel, S. Spanier, A. Noble, R. Landua, T. Kiel, U. Meyer-Berkhout, E. Schäfer, H. Bossy, G. Pinter, M. Englert, C. Straβburger, L. Montanet, B. Kämmle, U. Strohbusch, H. Matthaey, S. von Dombrowski, P. Schmidt, W. Dünnweber, M. Merkel, P. Illinger, K. Braune, J. Lüdemann, C.J. Batty, Mark J. Burchell, S. Ravndal, Claude Amsler, J. P. Merlo, K. Königsmann, K. Beuchert, N. Winter, R. Hackmann, D. Jamnik, P. Blüm, D. Engelhardt, D.V. Bugg, I. Augustin, K. Peters, R. P. Haddock, U. Wiedner, Michael Doser, C.A. Baker, M. A. Faessler, F. Walter, R. Bossingham, Kenneth M. Crowe, P. Birien, T. Case, B. M. Barnett, and C. Kolo
Subjects: Physics, Nuclear and High Energy Physics, Angular momentum, Annihilation, Antiproton, Branching fraction, S-wave, Atom, Atomic physics
Abstract: The annihilation p p →π 0 π 0 was measured for antiprotons stopped in liquid hydrogen (LH2). This reaction is only allowed from odd angular momentum states of the p p - atom . The resulting branching ratio BR ( p p →π 0 π 0 ) LH 2 =(6.93±0.22 stat ±0.37 syst )×10 −4 , combined with a previous measurement of the branching ratio BR ( p p →π + π − ) 2 P in gas from the 2P-state of p p suggests a fraction of P-wave annihilation in LH2 of (28.8±3.5)%, much larger than the values obtained from other annihilation channels. A method of reconciling the contradictory results is discussed.
Published: 1992
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47. The pseudoscalar mixing angle ΘPS from ν and ν′ production in annihiltion at rest

Author: B. Kämmle, Č. Zupančič, M. Englert, S. v. Dombrowski, Bernhard Schmid, P. Blüm, G. Pinter, M. Suffert, U. Meyer-Berkhout, M. Merkel, D.V. Bugg, R. Landau, B. M. Barnett, C. Felix, P. Hidas, C. Kolo, C.J. Batty, L. Montanet, R. Hackmann, Nigel Hessey, J. Kisiel, Eberhard Klempt, T. Kiel, C. A. Meyer, H. P. Dietz, K. Beuchert, R. Bossingham, C.A. Baker, N. Winter, H. Bossy, U. Wiedner, D. Jamnik, D. Engelhardt, F. H. Heinsius, P. Illinger, J. P. Merlo, A. Noble, Michael Doser, A. H. Sanjari, A. Cooper, C. Völcker, C. Straβburger, K. Königsmann, J. Zoll, Herbert Koch, James A. Bistirlich, Kenneth M. Crowe, S. Ravndal, Marcel Kunze, D. Walther, M. A. Faessler, S. Spanier, R.P. Haddock, I. Augustin, H. Matthaey, P. Schmidt, K. Peters, U. Strohbusch, W. Dünnweber, J. Lüdemann, P. Birien, D. Urner, T. Case, Claude Amsler, K. Braune, S. U. Chung, H. Kalinowsky, E. Schäfer, G. Folger, Michael Kobel, and Mark J. Burchell
Subjects: Physics, Pseudoscalar, Rest (physics), Nuclear and High Energy Physics, Particle physics, Branching fraction, Mixing (physics)
Abstract: We have determined ratios of branching ratios for p p annihilations at rest into π0η and π0η′, into ηη and ηη′, and into ωη and ωη′. All reactins are observed in two different all-neutral final states. The ratios permit a determination of the pseudoscalar mixing angle. We find ΘPS = −(17.3±1.8)°.
Published: 1992
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48. Proton-antiproton annihilation into ηηπ-observation of a scalar resonance decaying into ηη

Author: Herbert Koch, C. Felix, U. Meyer-Berkhout, Z. Jávorfi, G. Pinter, C. A. Meyer, A. Noble, R. Hackmann, T. Kiel, S. Spanier, L. Montanet, B. Kämmle, C.A. Baker, S. von Dombrowski, B. M. Barnett, R. P. Haddock, Č. Zupančič, U. Wiedner, Kenneth M. Crowe, K. Beuchert, R. Landua, Michael Doser, H. Matthaey, N. Winter, F. H. Heinsius, P. Schmidt, C. Völcker, C. Kolo, D. Jamnik, D. Engelhardt, H. Bossy, C. J. Batty, Marcel Kunze, W. Dünnweber, A. H. Sanjari, S. Ravndal, M. Englert, Eberhard Klempt, H. P. Dietz, J. P. Merlo, I. Augustin, K. Königsmann, R. Bossingham, P. Blüm, D. Walther, B. Schmid, U. Strohbusch, D.V. Bugg, A. Cooper, P. Illinger, J. Lüdemann, D. Urner, T. Case, C. Straβburger, James A. Bistirlich, K. Braune, J. Zoll, M. Merkel, Nigel Hessey, Mark J. Burchell, Pàl Hidas, C. Amsler, P. Birien, M. A. Faessler, M. Suffert, K. Peters, G. Folger, H. Kalinowsky, R. Beckmann, and E. Schäfer
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Proton, 010308 nuclear & particles physics, Isoscalar, Nuclear Theory, Scalar (mathematics), Dalitz plot, 01 natural sciences, Resonance (particle physics), Nuclear physics, Antiproton, 0103 physical sciences, Mass spectrum, 010306 general physics
Abstract: The results of a measurement of pp annihilation at rest into ηηπ 0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar J PC =0 ++ resonance decaying into ηη is observed with a mass of 1560±25 MeV/ c 2 and a width of 245±50 MeV/ c 2 .
Published: 1992
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49. Analyzing power in pion-proton bremsstrahlung, and theΔ++(1232)magnetic moment

Author: B. van den Brandt, C. A. Meyer, R.P. Haddock, Kenneth M. Crowe, J. P. Perroud, James A. Bistirlich, A. Bosshard, S. Ljungfelt, Dieter Renker, S. Mango, P. Truöl, Michael Doser, J. Riedlberger, J. A. Konter, Claude Amsler, D. I. Sober, M. Schaad, J. F. Loude, and M. Döbeli
Subjects: Nuclear physics, Physics, Elastic scattering, Proton, Magnetic moment, Computer Science::Information Retrieval, Proton magnetic moment, Hadron, Sensitivity (control systems), Atomic physics, Energy (signal processing), Delta baryon
Abstract: We report on a first measurement of the polarized-target asymmetry of the pion-proton bremsstrahlung cross section ({pi}{sup +}{ital p}{r arrow}{pi}{sup {minus}}{ital p}{gamma}). As in previous cross section measurements the pion energy (298 MeV) and the detector geometry for this experiment was chosen to optimize the sensitivity to the radiation from the magnetic dipole moment of the {Delta}{sup ++}(1232) resonance {mu}{sub {Delta}}. Comparison to a recent isobar model for pion-nucleon bremsstrahlung yields {mu}{sub {Delta}}=(1.62{plus minus}0.18){mu}{sub {ital p}}, where {mu}{sub {ital p}} is the proton magnetic moment. Since the asymmetry depends less than the cross section on the choice of the other input parameters for the model, their uncertainties affect this analysis by less than the experimental error. However the theory fails to represent both the cross section and the asymmetry data at the highest photon energies. Hence further improvements in the calculations are needed before the model dependence of the magnetic moment analysis can be fully assessed. The present result agrees with bag-model corrections to the SU(6) prediction {mu}{sub {Delta}}=2{mu}{sub {ital p}}. As a by-product, the analyzing power for elastic {pi}{sup +}{ital p} scattering at 415 MeV/{ital c} was also measured. This second result is in good agreement with phase shiftmore » calculations.« less
Published: 1991
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50. Improved measurement of the positive-muon lifetime and determination of the Fermi constant

Author: P. T. Debevec, R. McNabb, C. S. Özben, T. I. Banks, K. L. Giovanetti, C. C. Polly, P. A. Zolnierczuk, V. Tishchenko, M. Hance, Kenneth M. Crowe, C. J. G. Onderwater, M. F. Hare, S. M. Clayton, D. M. Webber, Susanne Rath, B. Lauss, Françoise Mulhauser, J. Wasserman, T. P. Gorringe, D. B. Chitwood, S. Dhamija, J. P. Miller, K. R. Lynch, B. L. Roberts, null null, C. S. Oezben, D. W. Hertzog, S. Cheekatmalla, R. M. Carey, B. Kiburg, S. Battu, Q. Peng, M. J. Barnes, I. Logashenko, P. Winter, J. Crnkovic, J. Kunkle, A. Gafarov, W. Earle, P. Kammel, F. Gray, G. D. Wait, and KVI - Center for Advanced Radiation Technology
Subjects: Physics, Coupling, Muon, Physics::Instrumentation and Detectors, FOS: Physical sciences, General Physics and Astronomy, Scintillator, High Energy Physics - Experiment, Nuclear physics, Pseudoscalar, NEUTRON DECAY, High Energy Physics - Experiment (hep-ex), Scintillation counter, RADIATIVE-CORRECTIONS, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Beam (structure), Fermi Gamma-ray Space Telescope
Abstract: The mean life of the positive muon has been measured to a precision of 11 ppm using a low-energy, pulsed muon beam stopped in a ferromagnetic target, which was surrounded by a scintillator detector array. The result, tau_mu = 2.197013(24) us, is in excellent agreement with the previous world average. The new world average tau_mu = 2.197019(21) us determines the Fermi constant G_F = 1.166371(6) x 10^-5 GeV^-2 (5 ppm). Additionally, the precision measurement of the positive muon lifetime is needed to determine the nucleon pseudoscalar coupling g_P., As published version (PRL, July 2007)
Published: 2007
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