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1. Microstructure and Compression Properties of Fe-Cr-B Alloy Manufactured using Laser Metal Deposition

Author

Y.-A. Joo, T.-S. Yoon, S.-H. Park, and K.-A. Lee

Subjects
fe-cr-b composite, laser metal deposition, bulk type, microstructure, compressive properties, Mining engineering. Metallurgy, TN1-997, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Fe-Cr-B alloy is a material with precipitation of boride inside Fe matrix, and it features outstanding hardness and wear resistance properties. However, Fe-Cr-B alloy is a difficult material to process, making it difficult to use as a bulk type structure material which requires delicate shapes. This study attempted to manufacture Fe-Cr-B alloy using a 3D printing process, laser metal deposition. This study also investigated the microstructure, hardness and compression properties of the manufactured alloy. Phase analysis results is confirmed that α-Fe phase as matrix and (Cr, Fe)2B phase as reinforcement phase. In the case of (Cr, Fe)2B phase, differences were observed according to the sample location. While long, coarse, unidirectional needle-type boride phases (~11 μm thickness) were observed in the center area of the sample, relatively finer boride phases (~6 μm thickness) in random directions were observed in other areas. At room temperature compression test results confirmed that the sample had a compression strength is approximately 2.1 GPa, proving that the sample is a material with extremely high strength. Observation of the compression fracture surface identified intergranular fractures in areas with needle-type boride, and transgranular fractures in areas with random borides. Based on this results, this study also reviewed the deformation behavior of LMD Fe-Cr-B alloy in relation to its microstructures.

Published
2018
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2. Comparison of H5N1, H5N8, and H3N2 Using Decision Tree and Apriori Algorithm

Author

T. S. Yoon, Y. L. Kim, K. H. Park, H. N. Cho, and S. P. Jang

Subjects
Apriori algorithm, Veterinary medicine, viruses, Canine influenza, medicine, Decision tree, virus diseases, Outbreak, Biology, medicine.disease_cause, Virology, Influenza A virus subtype H5N1, Virus
Abstract

H3N2, H5N1 and H5N8 virus were wide-spread epidemic in South Korea. Especially in 2014 Korea, the serious outbreak of avian influenza caused by H5N8 took place, effecting not only birds but also dogs. Antibody of H5N8 virus was found on a dog which differentiated the virus from existing H3N2 canine virus. At this point, we wanted to find out why H5N8 was self-medicated in dogs and whether H5N8 would cross species boundaries and be fatal to dogs or other species. While H5N1 is avian influenza like H5N8, many cases of fatal infections among dogs caused by H5N1 have been reported. Another kind of avian influenza, H3N2 is most common type of canine influenza in Asia. With the use of decision tree and apriori algorithm, we could find out characteristics of H5N8 by comparing it with H5N1 and H3N2.

Published
2015

3. Influence of Incorporated Pt-Fe2O3 Core-Shell Nanoparticles on the Resistive Switching Characteristics of ZnO Thin Film

Author

E J, Yoo, S Y, Kang, E L, Shim, T S, Yoon, C J, Kang, and Y J, Choi

Abstract

The resistance-switching characteristics of metal oxides have attracted great interest for the non-volatile memory applications such as resistive random access memory. A basic resistive random access memory device has a metal/insulator/metal structure, and its memory effect is achieved by applying voltage to change the resistance of the insulating layer. One of the promising candidates for explaining the resistance-switching mechanism is the formation and rupture of nanoscale conductive filaments. However, this model has an issue that needs to be addressed: the wide distribution of switching voltage due to randomly formed filaments. Therefore, some researchers have reported a decrease in switching voltage distribution and an increase in switching stability by incorporating nanoparticles into the insulating layer. In this study, we investigated influence of incorporated Pt-Fe2O3 core-shell nanoparticles on the resistive switching characteristics of ZnO thin films. Devices were fabricated on SiO2 wafers. A 100-nm-thick Cr layer was used as the bottom electrode. A 50-nm-thick ZnO layer was deposited using the sputtering method, and Pt-Fe2O3 nanoparticles were deposited on it by the dip coating method. A 50-nm-thick ZnO layer was then deposited again. A top Cr electrode (size: 100 μm x 100 μm) was deposited using a shadow mask and sputtering system. All the devices showed bipolar resistance-switching behavior that is observed in Cr/ZnO/Cr structures. However, the on/off voltage was dramatically lowered by incorporating nanoparticles into the insulating layer when compared with that of the devices without nanoparticles. In addition, the switching stability of the devices was improved upon the incorporation of nanoparticles. On the basis of these results, we can conclude that Pt-Fe2O3 nanoparticles may be used to enhance the resistance switching properties of ZnO thin films by incorporating them into the films.

Published
2016

4. Search for variable stars in the open cluster NGC 2539

Author

Y.-B. Jeon, M.-Y. Chun, T. S. Yoon, H. B. Ann, Myung Gyoon Lee, K. J. Choo, Seung-Lee Kim, In-Soo Yuk, Hwankyung Sung, and Byeong-Gon Park

Subjects
Physics, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Light curve, Blue straggler, Hubble sequence, symbols.namesake, Distance modulus, Space and Planetary Science, Binary star, symbols, Cluster (physics), Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Variable star, Instability strip, Astrophysics::Galaxy Astrophysics, Open cluster
Abstract

We present UBVIabsolute and V-band time-series CCD photometric results for the intermediate-age open cluster NGC 2539. From the empirical zero-age main sequence and theoretical isochrone fitting in color-color and color-magnitude diagrams, we estimated the physical parameters of this cluster as follows: the color excess of E(B − V) = 0.06 ± 0.03, the distance modulus of (V − MV)0 = 10.2 ± 0.1 and the age of logt = 8. 8( ∼630 Myr). By carefully examining the time-series images, we discovered seven new variable stars in the observed cluster field. Considering the light curves, periods and positions on the color-magnitude diagram, we classified them as five eclipsing binary stars, one δ Scuti star and one γ Doradus candidate. The γ Doradus candidate might not be a cluster member because it is located redder by about ∆(B −V) = 0.2 than the cool edge of γ Doradus instability strip.

Published
2003

5. [Untitled]

Author

T. S. Yoon, C. O. Kim, E. S. Koo, Ying Li, and W. S. Cho

Subjects
Materials science, Analytical chemistry, Sputter deposition, Coercivity, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Taguchi methods, Electrical resistivity and conductivity, Sputtering, Cavity magnetron, Electrical and Electronic Engineering, Composite material, Thin film, Relative permeability
Abstract

The Taguchi experimental design was used in this study to obtain optimal conditions for which as-deposited Fe-Sm-O thin films with both good soft magnetic properties and high electrical resistivity could be fabricated by r.f. magnetron sputtering method. The factors considered were the number of Sm2O3 chips, sputtering power and time, base vacuum, Ar work pressure, and O2 partial pressure. The results showed that the optimal conditions were as follows: four Sm2O3 chips sputtering power of 350 W, sputtering time of 10 min, base vacuum of 2.6×10-4Pa, work pressure of 0.2 Pa and O2 content in Ar of 5%. The thin film fabricated at those conditions had the composition of Fe75.3Sm4.3O20.4. The properties of as-deposited Fe75.3Sm4.3O20.4 thin film were: saturation magnetization of 16.3 kG, coercivity of 0.9 Oe, effective permeability of 2200 in the range of 0.5–100 MHz, and electrical resistivity of 190 μΩ cm. The percentage contribution of each factor to electrical resistivity, soft magnetic properties such as magnetic permeability, coercivity and saturation magnetization were also calculated.

Published
2002

6. Mosaic spread analysis of Canadian advanced protein crystallization experiment on the Russian space station, Mir

Author

Jurgen Sygusch, H.E Bosshard, S Tétreault, R.M Sweet, and T.-S Yoon

Subjects
Diffraction, Chemistry, Crystal growth, Condensed Matter Physics, Molecular physics, law.invention, Inorganic Chemistry, Crystal, Crystallography, Dynamic light scattering, law, X-ray crystallography, Materials Chemistry, Crystallization, Diffusion (business), Protein crystallization
Abstract

Protein crystallization experiments were performed on the Russian space station, Mir, using liquid–liquid interface diffusion. The technique was activated in orbit by the sliding together of two half-wells containing protein and precipitant fluids, respectively. Imperfections in protein crystals were analyzed from rocking curve measurements of the diffracted intensities using synchrotron radiation. Data were collected on microgravity and earth-grown crystals, and 10 different protein pairs were compared. To avoid bias, a double-blind protocol was used throughout the data analysis. Rocking curves for individual reflections were analyzed in terms of crystal domains, each fitted by a three-dimensional Gaussian profile. The results of Gaussian analysis were consistent with domain segregation corresponding to spatially different regions of the protein crystal exhibiting distinct mosaic spreads. When crystals were grown in microgravity the domain mosaic spreads were consistent with five of 10 different proteins exhibiting fewer imperfections, three other proteins showed no significant difference while a remaining two proteins displayed a greater number of apparent imperfections. Ground (earth-grown) controls were also conducted on protein samples flown to assess protein stability as a function of solution storage time prior to protein crystal growth (PCG) activation in microgravity. Protein samples were stored in ground controls at concentrations used to initiate crystallization, and aliquots were analyzed after a 30-day period by dynamic light scattering. Polydispersity estimates indicated that prolonged storage induced heterogeneity in all protein samples. Stable aggregates were present, and they were concentration independent, as shown by resistance to protein sample dilution. A PCG growth model is proposed that takes into account large scale aggregation or self-impurities present during crystal growth and predicts domain segregation. Trapping or rejection of self-impurities using this model can qualitatively explain differences in domain mosaic spreads observed as a function of gravitational environment.

Published
2001

7. A search for the electric dipole moment of the τ-lepton

Author

H. Albrecht, T. Hamacher, R.P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H.D. Schulz, M. Walter, R. Wurth, C. Hast, H. Kapitza, H. Kolanoski, A. Kosche, A. Lange, A. Lindner, M. Schieber, T. Siegmund, H. Thurn, D. Töpfer, D. Wegener, C. Frankl, J. Graf, M. Schmidtler, M. Schramm, K.R. Schubert, R. Schwierz, B. Spaan, R. Waldi, K. Reim, H. Wegener, R. Eckmann, H. Kuipers, O. Mai, R. Mundt, T. Oest, R. Reiner, A. Rohde, W. Schmidt-Parzefall, J. Stiewe, S. Werner, K. Ehret, W. Hofmann, A. Hüpper, K.T. Knöpfle, J. Spengler, P. Krieger, D.B. MacFarlane, J.D. Prentice, P.R.B. Saull, K. Tzamariudaki, R.G. Van de Water, T.-S. Yoon, M. Schneider, S. Weseler, M. Bračko, G. Kernel, P. Križan, E. Križnič, G. Medin, T. Podobnik, T. Živko, V. Balagura, S. Barsuk, I. Belyaev, R. Chistov, M. Danilov, V. Eiges, L. Gershtein, Yu. Gershtein, A. Golutvin, O. Igonkina, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, and Yu. Zaitsev

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Particle physics, Argus, 010308 nuclear & particles physics, FOS: Physical sciences, Observable, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Dipole, Electric dipole moment, 0103 physical sciences, CP violation, 010306 general physics, computer, Storage ring, Lepton, computer.programming_language
Abstract

Using the ARGUS detector at the e+e- storage ring DORIS II, we have searched for the real and imaginary part of the electric dipole formfactor d_tau of the tau lepton in the production of tau pairs at q^2=100 GeV^2. This is the first direct measurement of this CP violating formfactor. We applied the method of optimised observables which takes into account all available information on the observed tau decay products. No evidence for CP violation was found, and we derive the following results: Re(d_tau)=(1.6+-.9)*10^(-16) ecm and Im(d_tau)=(-0.2+-0.8)*10^(-16) ecm, where statistical and systematic errors have been combined., 8 pages, 5 figures (10 subfigures)

Published
2000

8. Photometric Oscillations at about 200 Days in the Symbiotic Variable PU Vulpeculae

Author

T. S. Yoon and R. K. Honeycutt

Subjects
Physics, Space and Planetary Science, Astronomy, Astronomy and Astrophysics, Astrophysics
Abstract

We show that as PU Vul fell to full quiescence in 1994, following a long outburst, the system developed well-defined 0.2 mag oscillations with a characteristic period of ~211 days. This quasi-periodicity is distinctly different from the behavior seen during late decline from outburst, where weaker photometric variations near 317, 227, and 120 days were seen. Suggested causes for this variation are discussed.

Published
2000

9. Evidence for Λc(2593)+ production

Author

D. O. Litvintsev, R. Mundt, C. Frankl, B. Spaan, H. Thurn, Ruslan Chistov, P. Pakhlov, V. Eiges, R. Waldi, R. P. Hofmann, P. R.B. Saull, D. B. MacFarlane, Sebastian Nowak, D. Wegener, J. Spengler, T. Siegmund, A. Snizhko, W. Schmidt-Parzefall, T. Oest, M. Schramm, H. Kapitza, H. Kuipers, A. Nau, I. Korolko, Michael Schneider, Holger Schulz, Peter Krieger, Sergey Semenov, M. Bracko, G. Kernel, Hermann Kolanoski, H. Wegener, S. Weseler, T. Živko, H. Schröder, T. S. Yoon, R. Schwierz, T. Podobnik, G. Medin, O. Igonkina, Klaus R. Schubert, K. T. Knöpfle, Ivan Belyaev, L. Gershtein, Sergey Barsuk, J.D. Prentice, A. Lindner, M. Schieber, C. Hast, Thomas Hamacher, S. Werner, J. Graf, K. Tzamariudaki, D. Töpfer, A. Lange, M. Walter, R. G. Van de Water, O. Mai, A. Rohde, R. Eckmann, Yu. Zaitsev, K. Reim, H. Albrecht, R. Mankel, R. Wurth, T. Kirchhoff, E. Križnič, P. Križan, A. Golutvin, Yu. Gershtein, J. Stiewe, D. Reßing, I. Tichomirov, M. Schmidtler, A. Hüpper, Vladislav Balagura, Mikhail Danilov, A. Kosche, Werner Hofmann, K. Ehret, G. Kostina, and R. Reiner

Subjects
Baryon, Physics, Nuclear and High Energy Physics, Argus, Electron–positron annihilation, Excited state, DESY, Atomic physics, computer, computer.programming_language
Abstract

Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have found evidence for the production of the excited charmed baryon state Λc(2593)+ in the channel Λc+π+π−. Its mass was determined to be (2594.6±0.9±0.4) MeV/c2, and the natural width measured to be Γ = (2.9−2.1−1.4+2.9+1.8) MeV. The production cross section times the branching ratios of σ(e+e− → Λc(2593)+X) × Br(Λc(2593)+ → Λc+π+π−) × Br(Λc+ → pK−π+) was measured to be (0.25−0.13+0.24 ±0.13) pb. The fractions of Λc(2593)+ decays proceeding through the Σc0π+ and Σc++π− channels were determined to be 0.29±0.10±0.11 and 0.37±0.12±0.13, respectively.

Published
1997

10. Two measurements of mixing using kaon tagging

Author

H. Wegener, R. Schwierz, R. G. Van de Water, T. Podobnik, H. Albrecht, J. Spengler, A. Hüpper, T. S. Yoon, R. Mankel, Klaus R. Schubert, R. Waldi, W. Schmidt-Parzefall, R. Wurth, R. Mundt, O. Igonkina, R. P. Hofmann, H. Kuipers, Yu. Gershtein, J. Stiewe, C. Frankl, Ivan Belyaev, A. Nau, S. Werner, C. Hast, Michael Schneider, D. Reßing, Sergey Semenov, G. Kernel, Hermann Kolanoski, M. Walter, H. Thurn, J. D. Prentice, T. Oest, R. Chistov, I. Tichomirov, A. Lange, Sebastian Nowak, J. Graf, K. Ehret, L. Gershtein, D. Wegener, D. Töpfer, P. Eckstein, O. Mai, I. Korolko, D. O. Litvintsev, M. Schramm, Vladislav Balagura, T. Kirchhoff, V. Eiges, B. Spaan, P. Krieger, M. Schieber, H. Kapitza, P. Pakhlov, G. Kostina, Thomas Hamacher, Axel Lindner, K. Reim, M. Schmidtler, R. Reiner, H. Schröder, Mikhail Danilov, R. Eckmann, Yu. Zaitsev, Holger Schulz, A. Kosche, K. T. Knöpfle, E. Križnič, T. Živko, Werner Hofmann, S. Weseler, D. B. Macfarlane, P. R. B. Saull, P. Križan, A. Golutvin, T. Siegmund, K. Tzamariudaki, and A. Snizhko

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Branching fraction, Electron–positron annihilation, DESY, Multiplicity (mathematics), computer, Mixing (physics), computer.programming_language
Abstract

Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have made two measurements of the mixing parameter χd using kaons as flavour tags. Using D∗+ K± correlations we found χd = 0.20 ± 0.13 ± 0.12 and from the study of (D∗+l−) K± correlations we obtained χd = 0.19 ± 0.07 ± 0.09. The branching ratio for B → D∗+ X has been updated: Br(B → D∗+ X) = (19.6 ± 1.9)%. We have also determined the average multiplicity of charged kaons in B0 decays to be 0.78 ± 0.08.

Published
1996

11. Two-photon production of ω pairs

Author

Sebastian Nowak, D. Wegener, Mikhail Danilov, J. Spengler, T. Siegmund, M. Schramm, A. Kosche, R. Mundt, Axel Lindner, K. Ehret, C. Frankl, G. Kernel, R. Chistov, G. Kostina, Ivan Belyaev, R. Reiner, Werner Hofmann, A. Lange, I. Korolko, I. Tichomirov, H. Thurn, T. Oest, W. Schmidt-Parzefall, J. Stiewe, O. Mai, T. S. Yoon, O. Igonkina, D. Reßing, K. T. Knöpfle, J. Graf, V. Eiges, Klaus R. Schubert, H. Kuipers, D. Töpfer, Holger Schulz, P. R. B. Saull, A. Hüpper, H. Wegener, M. Schieber, T. Živko, R. P. Hofmann, T. Podobnik, H. Kapitza, K. Reim, Yu. Gershtein, P. Pakhlov, M. Schmidtler, R. Waldi, S. Weseler, R. G. Van de Water, C. Hast, Michael Schneider, A. Nau, Sergey Semenov, Hermann Kolanoski, Vladislav Balagura, L. Gershtein, Thomas Hamacher, P. Eckstein, R. Schwierz, D. O. Litvintsev, B. Spaan, H. Schröder, M. Walter, S. Werner, Sergey Barsuk, H. Albrecht, R. Mankel, R. Wurth, J. D. Prentice, P. Krieger, T. Kirchhoff, R. Eckmann, Yu. Zaitsev, K. Tzamariudaki, A. Snizhko, E. Križnič, D. B. Macfarlane, P. Križan, and A. Golutvin

Subjects
Physics, Nuclear and High Energy Physics, Cross section (physics), Argus, Two-photon excitation microscopy, Value (computer science), Production (computer science), Maximum likelihood analysis, Atomic physics, computer, Omega, computer.programming_language
Abstract

A maximum likelihood analysis of ARGUS data on two-photon production of π+π+π0π0π−π− is presented. A small fraction of events is due to the production of omega pairs. The γγ → ωω cross section has its maximum value close to threshold.

Published
1996

12. Measurement of the semileptonic branching fractions of the D0 meson

Author

I. Korolko, A. Snizhko, R. G. Van de Water, S. Weseler, Yu. Gershtein, J. Stiewe, R. Waldi, P. R. B. Saull, D. Reßing, M. Schieber, Ivan Belyaev, T. Oest, Klaus R. Schubert, A. Lindner, R. Mundt, M. Walter, J. Graf, D. Töpfer, R. Schwierz, C. Frankl, Mikhail Danilov, Michael Schneider, H. Kapitza, Olga Igonkina, M. Schmidtler, H. Wegener, J. Spengler, T. Siegmund, T. Podobnik, D. O. Litvintsev, H. Thurn, Sebastian Nowak, A. Kosche, T. S. Yoon, B. Spaan, G. Kernel, R. Chistov, P. Pakhlov, D. Wegener, V. Eiges, W. Schmidt-Parzefall, Werner Hofmann, I. Tichomirov, Vladislav Balagura, M. Schramm, L. Gershtein, P. Eckstein, Thomas Hamacher, K. Tzamariudaki, H. Kuipers, A. Nau, Sergey Semenov, Holger Schulz, Hermann Kolanoski, K. T. Knöpfle, H. Schröder, K. Reim, T. Živko, A. Hüpper, R. P. Hofmann, R. Eckmann, Yu. Zaitsev, T. Kirchhoff, S. Werner, H. Albrecht, R. Mankel, R. Wurth, Sergey Barsuk, C. Hast, A. Lange, O. Mai, E. Križnič, P. Krieger, J. D. Prentice, D. B. Macfarlane, P. Križan, A. Golutvin, K. Ehret, G. Kostina, and R. Reiner

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Annihilation, Meson, Branching fraction, Hadron, Analytical chemistry, Branching (polymer chemistry), computer, Particle Physics - Experiment, computer.programming_language
Abstract

Using the ARGUS detector at the e + e − storage ring DORIS II, we have measured the semileptonic branching ratios of the D 0 meson to be Br ( D 0 → e + ν e X ) = (6.9 ± 0.3 ± 0.5) % and Br ( D 0 → μ + ν μ X ) = (6.0 ± 0.7 ± 1.2) %, and the semileptonic branching ratio of the charmed hadron mixture from e + e − annihilation around 10 GeV to be Br ( c → e + ν e X ) = (9.6 ± 0.4 ± 1.1) %.

Published
1996

13. A Non-Peptide Angiotensin II Receptor Antagonist: 2-Butyl-6-dimethoxymethyl-5-phenyl-1-{[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl}-1H-imidazo[5,4-b]pyridine

Author

T. S. Yoon, Whanchul Shin, and Sung Eun Yoo

Subjects
Models, Molecular, Angiotensin receptor, Angiotensin Receptor Antagonists, Molecular Structure, Bicyclic molecule, Pyridines, Stereochemistry, Imidazoles, Molecular Conformation, General Medicine, Methylene bridge, Crystallography, X-Ray, Ring (chemistry), Angiotensin II, General Biochemistry, Genetics and Molecular Biology, chemistry.chemical_compound, chemistry, Pyridine, Moiety, Antihypertensive Agents
Abstract

The title compound, C33H33N7O2, is one of a series of imidazo[4,5-b]pyridine-based angiotensin II receptor antagonists showing high antihypertensive activity. The biphenyltetrazole moiety assumes the same conformation as in related compounds, but its relative orientation with respect to the central fused ring is different to that in these compounds, indicating that there is considerable conformational flexibility about the methylene bridge joining the two ring systems.

Published
1996

14. A measurement of the electronic widths Γ ee of the ϒ(1S), ϒ(2S), and ϒ(4S) resonances, and of the total decay width Γ of the ϒ(4S)

Author

R. P. Hofmann, S. Werner, P. Pakhlov, Ivan Belyaev, P. R. B. Saull, A. Snizhko, A. Hüpper, Peter Krieger, H. Wegener, T. Kirchhoff, Michael Schneider, Sebastian Nowak, D. Wegener, R. Schwierz, T. Podobnik, J. Spengler, A. Nau, Sergey Semenov, R. G. Van de Water, I. Korolko, H. Kapitza, D. Töpfer, Holger Schulz, C. Hast, T. Siegmund, A. Lindner, A. Lange, Hermann Kolanoski, M. Walter, P. Križan, W. Schmidt-Parzefall, A. Golutvin, G. Kernel, R. Chistov, M. Schmidtler, T. Živko, O. Mai, M. Schramm, R. Mundt, H. Schröder, H. Kuipers, Thomas Hamacher, T. Oest, M. Schieber, L. Gershtein, E. Križnič, H. Albrecht, R. Mankel, R. Wurth, K. Tzamariudaki, H. Thurn, P. Eckstein, Mikhail Danilov, D. O. Litvintsev, Vladislav Balagura, A. Kosche, K. T. Knöpfle, R. Waldi, T. S. Yoon, R. Eckmann, Werner Hofmann, Klaus R. Schubert, I. Tichomirov, Yu. Zaitsev, B. Spaan, W. Funk, J. D. Prentice, K. Reim, C. Frankl, S. Weseler, Yu. Gershtein, J. Stiewe, D. Reßing, Sergey Barsuk, K. Ehret, G. Kostina, R. Reiner, and D. B. MacFarlane

Subjects
Physics, Argus, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Resonance, Elementary particle, DESY, Electron, Nuclear physics, Radiative transfer, Atomic physics, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract

The partial decay width into electrons, Γ ee , of the ϒ(1S) and ϒ(2S) resonances have been measured with the detector ARGUS at thee+e− storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: Γ ee (ϒ(1S))= (1.32±0.04±0.03) keV and Γ ee (ϒ(2S))=(0.52±0.03±0.01) keV. The total decay width of the ϒ(4S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width Γ(s) and a mass shift functionm(s), we obtain the following resonance parameters: Γ(M2)=(10.0±2.8±2.7) MeV, Γ ee =(0.28±0.05±0.01)keV andB ee =(2.77±0.50±0.49)·10−5. We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed ϒ(4S) resonance cross section.

Published
1995

15. Measurement of the decay D* s2 + (2573) → D0K+

Author

J. Spengler, K. Ehret, T. Siegmund, S. Weseler, Lnn Tichomirov, Axel Lindner, D. Reßing, Sebastian Nowak, K. Reim, G. Kernel, Holger Schulz, D. Wegener, T. S. Yoon, H. Schröder, A. Lange, T. Kirchhoff, J. Graf, Thomas Hamacher, D. Töpfer, D. B. MacFarlane, W. Schmidt-Parzefall, O. Mai, I. Korolko, E. Križnič, M. Schramm, T. Živko, G. Kostina, M. Schmidtler, R. Waldi, R. P. Hofmann, P. R.B. Saull, Yu. Gershtein, R. Mundt, R. Reiner, K. T. Knöpfle, H. Albrecht, C. Frankl, J.D. Prentice, R. Mankel, R. Wurth, H. Kuipers, M. Schieber, H. Thurn, K. Tzamariudaki, Vladislav Balagura, Mikhail Danilov, I. Bleyaev, K. R. Schubert, H. Kapitza, P. Pakhlov, V. Eiges, Peter Krieger, A. Snizhko, R. Eckmann, P. Križan, A. Golutvin, Yu. Zaitsev, A. Kosche, R. G. Van de Walter, Werner Hofmann, A. Hüpper, L. Gershtein, C. Hast, Michael Schneider, Ruslan Chistov, Sergey Barsuk, R. Schwierz, T. Oest, H. Wegener, T. Podobnik, A. Nau, Sergey Semenov, Hermann Kolanoski, P. Eckstein, D. O. Litvintsev, B. Spaan, and M. Walter

Subjects
Nuclear physics, Physics, Cross section (physics), Argus, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Detector, Value (computer science), DESY, computer, Storage ring, computer.programming_language
Abstract

Using the ARGUS detector at the e+e− storage ring DORIS II at DESY we have measured the parameters of a charmed strange meson D* s2 + (2573) decaying into D0K+. The mass of this state was found to be (2574.5±3.3±1.6) MeV/c 2. The measured value of its width is (10.4±8.3±3.0) MeV and the product of the production cross section and branching ratio for this channel was determined to be (10.6±4.2 −1.2 +2.3 ) pb.

Published
1995

16. Measurement of the decay fractions ofD * mesons

Author

A. Hüpper, T. Siegmund, V. Lubimov, J. D. Prentice, C. Frankl, R. Waldi, D. O. Litvintsev, Sebastian Nowak, D. Wegener, C. Hast, A. Lange, O. Mai, B. Spaan, H. Kapitza, I. Tichomirov, M. Schramm, Ivan Belyaev, G. Kostina, Manfred Paulini, I. Korolko, R. Schwierz, D. B. MacFarlane, P. Križan, Alexander Undrus, A. Golutvin, Mikhail Danilov, D. Töpfer, Michael Schneider, A. Kosche, Yuri Gershtein, A. Droutskoy, Klaus R. Schubert, K. Tzamariudaki, Vladimir Blinov, Peter Krieger, Werner Hofmann, H. Albrecht, R. Mankel, R. Wurth, R. Reiner, A. Snizhko, M. Schieber, R. Mundt, T. S. Yoon, P. Eckstein, Thomas Hamacher, P. R. B. Saull, R. P. Hofmann, H. Thurn, R. Eckmann, Yu. Zaitsev, S. Werner, E. Križnič, S. Chechelnitsky, T. Kirchhoff, R. G. Van de Water, M. Walter, P. Pakhlov, S. Khan, J. Stiewe, K. Ehret, K. T. Knöpfle, D. Reßing, H. Schröder, J. Spengler, G. Kernel, Holger Schulz, T. Živko, V. Zhilich, W. Schmidt-Parzefall, H. Kuipers, A. Nau, Sergey Semenov, Hermann Kolanoski, H. Wegener, T. Podobnik, A. Lindner, C. Ratz, T. Oest, K. Reim, S. Weseler, H. Ehrlichmann, M. Schmidtler, and Vladislav Balagura

Subjects
Physics, Argus, Nuclear magnetic resonance, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Analytical chemistry, Engineering (miscellaneous), computer, computer.programming_language
Abstract

Using the ARGUS detector at the DORIS II electron-positron storage ring at DESY, we have measured BR(D*+→D0π+)=(68.8±2.4±1.3)%, BR(D*+→D+π0)=(31.2±1.1±0.8)%, BR(D*+→D+γ)

Published
1995

17. A search for the lepton-flavour violating decays τ → eα, τ → μα

Author

Holger Schulz, Sebastian Nowak, D. Wegener, T. Živko, R. Schwierz, M. Schramm, H. Schröder, S. Weseler, P. Pakhlov, H. Wegener, A. Golutvin, P. R. B. Saull, J. Spengler, T. Kirchhoff, A. Hüpper, T. Podobnik, C. Hast, I. Korolko, Ivan Belyaev, Klaus R. Schubert, A. Lange, V. Eiges, M. Walter, R. Mundt, K. Ehret, A. Snizhko, H. Kapitza, O. Mai, C. Frankl, H. Thurn, Michael Schneider, G. Kostina, P. Eckstein, Yu. Gershtein, D. O. Litvintsev, M. Schmidtler, W. Schmidt-Parzefall, T. Oest, O. Igonkina, B. Spaan, R. Reiner, H. Kuipers, A. Nau, Sergey Semenov, R. P. Hofmann, Hermann Kolanoski, R. Eckmann, Yu. Zaitsev, S. Werner, J. Graf, J. Stiewe, Mikhail Danilov, D. Töpfer, D. Reßing, R. G. Van de Water, Vladislav Balagura, R. Waldi, P. Križnič, A. Kosche, K. Tzamariudaki, Thomas Hamacher, Werner Hofmann, I. Tichomirov, T. S. Yoon, G. Kernel, R. Chistov, M. Schieber, K. T. Knöpfle, L. Gershtein, D. B. MacFarlane, K. Reim, H. Albrecht, R. Mankel, R. Wurth, Sergey Barsuk, P. Kreger, J. D. Prentice, T. Siegmund, and A. Lindner

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, DESY, Spectral line, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), computer, Storage ring, Lepton, computer.programming_language
Abstract

Lepton spectra in τ decays have been studied with the ARGUS detector at thee+e− storage ring DORIS II at DESY using the “pseudo-rest-frame” technique. We have improved upper limits for two-body τ-decays into a lepton and an unobservable particle.

Published
1995

18. The first measurement of the Michel parameter η in τ decays

Author

Mikhail Danilov, Ivan Belyaev, G. Kostina, Klaus R. Schubert, T. S. Yoon, R. Schwierz, S. Weseler, A. Nau, Sergey Semenov, D. O. Litvintsev, R. Reiner, A. Kosche, Yuri Gershtein, B. Spaan, Hermann Kolanoski, D. Töpfer, I. Korolko, P. Pakhlov, P. Eckstein, H. Schröder, R. P. Hofmann, P. R.B. Saull, V. Lubimov, T. Siegmund, Werner Hofmann, Sebastian Nowak, D. Wegener, M. Schmidtler, R. G. Van de Water, I. Tichomirov, J. Stiewe, H. Wegener, K. T. Knöpfle, S. Chechelnitsky, R. Mundt, D. Reßing, P. Krieger, K. Ehret, A. Snizhko, C. Hast, H. Thurn, T. Podobnik, J. Spengler, Michael Schneider, E. Križnič, H. Kapitza, A. Hüpper, D. B. MacFarlane, Holger Schulz, K. Reim, J. D. Prentice, R. Waldi, Axel Lindner, T. Živko, A. Droutskoy, G. Kernel, A. Lange, C. Frankl, M. Walter, T. Oest, O. Mai, M. Schieber, R. Eckmann, Thomas Hamacher, Yu. Zaitsev, S. Werner, K. Tzamariudaki, P. Križan, A. Golutvin, W. Schmidt-Parzefall, Vladislav Balagura, H. Kuipers, T. Kirchhoff, H. Albrecht, R. Mankel, and R. Wurth

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Argus, Electron–positron annihilation, Hadron, DESY, Spectral line, Vertex (geometry), Nuclear physics, High Energy Physics::Experiment, computer, Storage ring, computer.programming_language, Lepton
Abstract

Using the ARGUS detector at the e+e - storage ring DORIS II at DESY, we have studied lepton energy spectra in ~- decays. We present a "pseudo-rest-frame" technique in which the second r in the event, decaying into a heavy hadronic system, is used as reference. This method allows for the first measurement of the Michel Parameter 7/in ~- decays. We also determine the Michel Parameter p in 7" --~ e~u decays with a precision comparable to the present world average. The measured values of the parameters p = 0.735 4- 0.036 4- 0.020 and r 1 = 0.03 4- 0.18 4- 0.12 are in good agreement with standard V-A coupling at the ~--~,-W vertex.

Published
1995

19. Evidence for W-exchange in charmed baryon decays

Author

S. Werner, D. O. Litvintsev, H. Schröder, Vladislav Balagura, B. Spaan, M. Walter, H. Wegener, Klaus R. Schubert, P. Krieger, T. Podobnik, I. Tichomirov, V. Lubimov, R. Waldi, M. Schieber, R. Mundt, I. Korolko, G. Kostina, H. Albrecht, R. Mankel, R. Wurth, P. R. B. Saull, Sebastian Nowak, D. Wegener, P. Križan, A. Golutvin, P. Eckstein, H. Thurn, Axel Lindner, Thomas Hamacher, S. Weseler, R. Schwierz, R. Reiner, Sally Seidel, H. Kapitza, A. Hüpper, T. Oest, Ivan Belyaev, Holger Schulz, J. D. Prentice, E. Križnič, A. Nau, Sergey Semenov, J. Stiewe, W. Schmidt-Parzefall, A. Snizhko, C. Frankl, R. P. Hofmann, S. Chechelnitsky, Hermann Kolanoski, K. Ehret, M. Schmidtler, H. Kuipers, C. E. K. Charlesworth, D. Töpfer, K. T. Knöpfle, T. Živko, T. Kirchhoff, D. B. Macfarlane, Mikhail Danilov, U. Becker, A. Droutskoy, D. Reßing, P. Pakhlov, T. Siegmund, J. Spengler, A. Kosche, A. Lange, G. Kernel, P. Eckmanm, K. Reim, O. Mai, Werner Hofmann, C. Hast, Michael Schneider, Yu. Zaitsev, Yu. Gershtein, T. S. Yoon, R. G. Van de Water, and K. Tzamariudaki

Subjects
Nuclear physics, Physics, Baryon, Nuclear and High Energy Physics, Argus, Particle physics, Branching fraction, Electron–positron annihilation, Mass spectrum, DESY, computer, computer.programming_language
Abstract

Using the detector ARGUS at the e+e− storage ring DORIS II at DESY, we have observed the decays Λc+ → Ξ−K+π+ and Λc+ → Ξ∗0K+ and obtained evidence for the decay Ξc0 → ΛKs0. All three of these decays are of interest as they provide information about W-exchange processes. The products of cross sections and branching ratios for Λc+ → Ξ−K+π+ and Λc+ → Ξ∗0K+ are (1.7±0.3±0.3) pb and (0.6±0.2±0.1) pb, respectively, which implies that (35±17) % of the Ξ−K+π+ final state is generated through a two-body decay via intermediate W-exchange. The product of production cross section and branching ratio for Ξc0 → Λ Ks0 is (2.1 ± 1.0 ± 0.6) pb.

Published
1995

20. Measurement of the polarization in the decay

Author

A. Snizhko, Holger Schulz, W. Schmidt-Parzefall, H. Kapitza, T. Živko, Ivan Belyaev, K. Tzamariudaki, H. Kuipers, R. Mundt, D. Töpfer, Yu. Gershtein, S. Weseler, R. G. Van de Water, Mikhail Danilov, L. Gershtein, H. Thurn, J. Stiewe, M. Schieber, Sebastian Nowak, T. Siegmund, R. Waldi, A. Droutskoy, D. Wegener, I. Korolko, E. Križnič, A. Kosche, G. Kostina, P. Pakhlov, M. Schramm, A. Lange, T. Kirchhoff, D. B. Macfarlane, Werner Hofmann, A. Hüpper, K. Reim, H. Wegener, T. Podobnik, R. Reiner, O. Mai, Vladislav Balagura, T. S. Yoon, K. T. Knöpfle, Axel Lindner, S. Barsuk, C. Hast, Michael Schneider, R. Chistov, I. Tichomirov, Klaus R. Schubert, D. Reβing, A. Nau, Sergey Semenov, H. Albrecht, R. Mankel, Hermann Kolanoski, J. Spengler, R. Wurth, T. Oest, P. R. B. Saull, P. Križan, A. Golutvin, M. Schmidtler, G. Kernel, Thomas Hamacher, K. Ehret, R. Schwierz, D. O. Litvintsev, B. Spaan, P. Eckstein, H. Schröder, M. Walter, R. P. Hofmann, P. Krieger, J. D. Prentice, C. Frankl, S. Werner, R. Eckmann, and Yu. Zaitsev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, CP violation, Polarization (waves), computer, Storage ring, computer.programming_language
Abstract

Polarization in the exclusive decay B → J/ψK ∗ was measured using the ARGUS detector at the e+e− storage ring DORIS II. The ratio of the transverse to the total decay width was found to be ΓT/Γ = 0.03±0.16±0.15. This measurement demonstrates that the B 0 → J/ψK ∗0 decay channel can be effectively used for CP violation studies.

Published
1994

21. Measurement of the absolute branching fractions for D0 decays into

Author

Sebastian Nowak, D. Wegener, M. Walter, R. Schwierz, V. Lubimov, E. Gershtein, M. Schieber, M. Schmidtler, T. Oest, W. Schmidt-Parzefall, I. Korolko, G. Kernel, Klaus R. Schubert, R. Eckmann, Yu. Zaitsev, H. Schröder, H. Kuipers, H. Wegener, C. Hast, S. Werner, T. Kirchhoff, R. G. Van de Water, T. Podobnik, A. Lange, S. Barsuk, G. Kostina, A. Lindner, R. Waldi, T. Siegmund, D. O. Litvintsev, O. Mai, Michael Schneider, Vladislav Balagura, Mikhail Danilov, John D. Spengler, T. S. Yoon, B. Spaan, Thomas Hamacher, H. Albrecht, R. Reiner, R. Mankel, R. Wurth, P. Pakhlov, K. T. Knöpfle, P. R. B. Saull, H. Kapitza, P. Eckstein, K. Ehret, R. P. Hofmann, M. Schram, Ivan Belyaev, A. Kosche, D. Töpfer, A. Droutskoy, Werner Hofmann, I. Tichomirov, Holger Schulz, A. Nau, Sergey Semenov, Hermann Kolanoski, A. Hüpper, T. Živko, K. Tzamariudaki, R. Mundt, A. Snizhko, H. Thurn, J. Stiewe, D. Reβing, K. Reim, Yu. Gershtein, S. Weseler, P. Krieger, J. D. Prentice, C. Frankl, E. Križnič, D. B. Macfarlane, P. Križan, and A. Golutvin

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Argus, Crystallography, Angular distribution, Meson, Electron–positron annihilation, Branching (polymer chemistry), computer, computer.programming_language
Abstract

Using the ARGUS detector at the e+ e− storage ring DORIS II we have measured the absolute branching ratios of the D0 meson, Br(D0→K− π+)=(3.41±0.12±0.28)%, Br(D0→K− π+ π+ π−)=(6.80± 0.27±0.57)%, and Br (D 0 → K 0 π + π − )=(5.03±0.39±0.49)% .

Published
1994

22. Determination of the structure of τ decays in the reaction and a precision measurement of the τ-neutrino helicity

Author

I. Tichomirov, A. Lange, Ivan Belyaev, T. Oest, O. Mai, E. Križnič, Vladislav Balagura, S. Weseler, T. Kirchhoff, R. Mundt, Sebastian Nowak, D. Wegener, D. O. Litvintsev, A. Snizhko, H. Thurn, Mikhail Danilov, D. Töpfer, T. S. Yoon, B. Spaan, I. Korolko, J. D. Prentice, Axel Lindner, V. Lubimov, A. Kosche, Yuri Gershtein, J. Stiewe, M. Schramm, S. Werner, P. Pakhlov, H. Wegener, W. Schmidt-Parzefall, M. Schmidtler, D. Reßing, C. Hast, Michael Schneider, D. B. MacFarlane, R. Waldi, T. Podobnik, R. P. Hofmann, P. R.B. Saull, Werner Hofmann, A. Hüpper, Thomas Hamacher, H. Kapitza, M. Walter, P. Krieger, H. Albrecht, R. Mankel, A. Droutskoy, P. Križan, A. Golutvin, R. Wurth, Holger Schulz, C. Frankl, R. Eckmann, Yu. Zaitsev, P. Eckstein, T. Živko, H. Kuipers, R. Schwierz, H. Schröder, T. Siegmund, K. Reim, A. Nau, Sergey Semenov, Hermann Kolanoski, S. Chechelnitsky, K. Ehret, G. Kostina, R. Reiner, M. Schieber, K. Tzamariudaki, R. G. Van de Water, K. R. Schubert, J. Spengler, G. Kernel, and K. T. Knöpfle

Subjects
Physics, Pseudoscalar, Nuclear and High Energy Physics, Particle physics, Absolute value, Neutrino, Helicity, Pseudovector, Standard Model, Spin-½, Lepton
Abstract

Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e + e − → τ + τ − → v τ π + π 0 v τ π − π 0 are exploited for a measurement of the normalized product of the vector ( g V ) and axial vector ( g A ) couplings of the τ lepton, γin AV = 2 Re {g A g V ∗ } (|g V | 2 ) . The correlations are sensitive to the product of the couplings in both τ decays: γ AV 2 = γ AV (τ − → ν τ W − ) AV = −h(v τ )h( v τ ) . The measured value, γ AV 2 = 1.044±0.057±0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value | γ AV | = 1.022±0.028±0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar ( g s ) or pseudoscalar ( g P ) couplings was also investigated. No evidence for a scalar-like coupling was found.

Published
1994

23. Determination of the radiative decay width of the η meson

Author

I. Korolko, Klaus R. Schubert, K. Reim, Sebastian Nowak, Mikhail Danilov, A. Hüpper, D. Wegener, A. Kosche, J. Spengler, Werner Hofmann, G. Kostina, R. Mundt, A. Nau, Sergey Semenov, T. Oest, K. Tzamariudaki, H. Albrecht, Thomas Hamacher, Hermann Kolanoski, R. Mankel, R. Wurth, Yu. Gershtein, M. Schramm, S. Werner, R. Reiner, T. S. Yoon, H. Thurn, P. Kržan, A. Snizhko, P. Eckstein, H. Kapitza, H. Wegener, V. Lubimov, S. Weseler, P. Pakhlov, M. Walter, D. O. Litvintsev, D. Reβing, P. Krieger, Ivan Belyaev, T. Podobnik, G. Kernel, B. Spaan, J. Stiewe, J. D. Prentice, R. G. Van de Water, C. Frankl, D. Töpfer, Axel Lindner, Holger Schulz, R. P. Hofmann, C. Hast, Michael Schneider, T. Kirchhoff, S. Chechelnitsky, R. Schwierz, M. Schmidtler, T. Živko, R. Waldi, M. Schieber, K. Ehret, A. Droutskoy, H. Schröder, R. Eckmann, Yu. Zaitsev, K. T. Knöpfle, A. Golutvin, E. Križnič, D. B. Macfarlane, Vladislav Balagura, A. Lange, O. Mai, W. Schmidt-Parzefall, H. Kuipers, P. R. B. Saull, T. Siegmund, and I. Tichomirov

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Argus, Meson, Branching fraction, Radiative decay, Mass spectrum, Value (computer science), Atomic physics, computer, computer.programming_language
Abstract

An analysis of the reaction yy ~ r/c was l~erformed in five different decay channels of the r/c: /~sK+~r ~, K+K-Tr+~ "- , 27r+21r -, ~b~b and 2K+2K -. A value Fry(r/c) = ( 11.3 + 4.2) keV was obtained for the radiative decay width by combining the results from the first four channels. Using our result on the two-photon width we also determined the branching ratio for the decay r/c --~ 2K+2K -.

Published
1994

24. Study ofD 0 andD + decays into final states with two or three kaons

Author

C. Hast, P. R. B. Saull, S. Weseler, T. Siegmund, I. Korolko, V. Lubimov, P. Križan, A. Golutvin, R. Schwierz, Klaus R. Schubert, R. Waldi, G. Kostina, A. Lange, O. Mai, M. Schmidtler, E. Križnič, Sebastian Nowak, D. B. MacFarlane, R. Mundt, D. Wegener, I. Tichomirov, R. Chistov, D. O. Litvintsev, H. Wegener, A. Droutskoy, R. Reiner, J. D. Prentice, A. Lindner, A. Snizhko, B. Spaan, C. Frankl, T. Podobnik, H. Thurn, M. Schramm, R. Eckmann, Yu. Zaitsev, K. Reim, Vladislav Balagura, A. Hüpper, P. Pakhlov, Ivan Belyaev, R. P. Hofmann, T. S. Yoon, P. Eckstein, T. Oest, S. Chechelnitsky, D. Töpfer, Peter Krieger, K. Tzamariudaki, Mikhail Danilov, K. Ehret, Holger Schulz, A. Kosche, T. Živko, Werner Hofmann, R. G. Van de Water, John D. Spengler, H. Albrecht, R. Mankel, R. Wurth, T. Kirchhoff, H. Kapitza, K. T. Knöpfle, Thomas Hamacher, A. Nau, Sergey Semenov, Hermann Kolanoski, W. Schmidt-Parzefall, M. Walter, G. Kernel, H. Kuipers, M. Schieber, H. Schröder, Yu. Gershtein, S. Barsuk, Michael Schneider, J. Stiewe, D. Reßing, and S. Werner

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Model prediction, Elementary particle, Nuclear physics, Field theory (psychology), Quantum field theory, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract

Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied Cabibbo-suppressedD0 decay modes resulting in theK+K−π+π− final state and two-bodyD0 decay modes with a ϕ meson in the final state. TheBR(D0→KS0KS0π+π− was measured for the first time. We also present a measurement of theD+→KS0KS0K+ branching ratio. The values are compared with other experimental results and model predictions.

Published
1994

25. Reconstruction of the decay B− → D10(2414) π−

Author

M. Walter, Holger Schulz, S. Chechelnitsky, H. Wegener, T. Podobnik, Michael Schneider, J. Stiewe, K. T. Knöpfle, K. Ehret, I. Tichomirov, Klaus R. Schubert, M. Schieber, T. Živko, T. Oest, R. Schwierz, G. Kostina, John D. Spengler, V. Lubimov, A. Lindner, H. Albrecht, R. Mankel, Sebastian Nowak, I. Korolko, Mikhail Danilov, R. Mundt, R. P. Hofmann, R. Wurth, D. Wegener, H. Schröder, G. Kernel, K. Reim, A. Kosche, P. Križan, A. Golutvin, H. Thurn, P. R. B. Saull, T. Kirchhoff, Vladislav Balagura, W. Schmidt-Parzefall, Werner Hofmann, A. Hüpper, P. Pakhlov, C. Hast, A. Droutskoy, Yu. Gershtein, T. Siegmund, T. S. Yoon, S. Weseler, K. Tzamariudaki, H. Kuipers, A. Nau, Sergey Semenov, A. Lange, R. Eckmann, Hermann Kolanoski, Yu. Zaitsev, A. Snizhko, D. Reβing, P. Eckstein, D. O. Litvintsev, R. G. Van de Water, B. Spaan, M. Schmidtler, S. Werner, Ivan Belyaev, E. Križnič, D. B. Macfarlane, D. Töpfer, R. Waldi, O. Mai, H. Kapitza, Thomas Hamacher, J. D. Prentice, C. Frankl, R. Reiner, and P. Krieger

Subjects
Physics, Nuclear and High Energy Physics, Argus, Meson, Excited state, Analytical chemistry, Atomic physics, computer, computer.programming_language
Abstract

We present the results of a partial reconstruction of the decay channel B − → D j (∗) π − performed using the ARGUS detector operating at the e+e− storage-ring DORIS II. In the context of this paper, D j (∗)0 is an L = 1 excited charm meson decaying to D ∗+ π − . The measured product of branching ratios is Br(B − → D 1 0 (2414)π − ) · Br Br(D 1 0 → D ∗+ π − ) = (0.17 ± 0.05 ± 0.04)% where the first error is statistical and statistical and the second systematic. No evidence for the decay B − → D 2 ∗0 (2459) π − ) · Br(D 2 ∗0 → D ∗+ π − ) at the 90% confidence level.

Published
1994

26. Kaons in flavour taggedB decays

Author

K. T. Knöpfle, V. Lubimov, A. Nau, Sergey Semenov, J. Spengler, G. Kernel, Hermann Kolanoski, H. I. Cronström, J. D. Prentice, M. Schieber, M. Walter, Dave Britton, J. Stiewe, P. M. Patel, Ivan Belyaev, A. Hüpper, D. O. Litvintsev, H. Albrecht, E. Križnič, H. Schröder, P. Pakhlov, Manfred Paulini, R. Wurth, B. Spaan, W. Funk, R. Waldi, D. Reßing, Sebastian Nowak, D. Wegener, R. P. Hofmann, T. S. Yoon, Leif J. Jönsson, S. Werner, Fedor Ratnikov, M. Bittner, K. Tzamariudaki, T. Kirchhoff, Michael Schneider, Peter Krieger, T. Oest, D. B. MacFarlane, C. Hast, D. Töpfer, K. Strahl, Vladislav Balagura, P. Eckstein, M. Seeger, A. Droutskoy, W. Schmidt-Parzefall, H. Wegener, A. Lange, P. R. B. Saull, I. Tichomirov, Thomas Hamacher, Yu. Zaitsev, V. Soloshenko, T. Podobnik, Yu. Gershtein, C. E. K. Charlesworth, A. Snizhko, Holger Schulz, A. Lindner, T. Siegmund, E.R.F. Hyatt, R. G. Van de Water, K. W. Edwards, P. Križan, A. Golutvin, S. Khan, T. Živko, Mikhail Danilov, H. Kapitza, A. Kosche, Werner Hofmann, R. Mundt, H. Thurn, S. Weseler, H. Ehrlichmann, M. Schmidtler, K. Reim, Rainer Mankel, K. R. Schubert, S. Chechelnitsky, K. Ehret, G. Kostina, and R. Reiner

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, Nuclear physics, Angular distribution, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, Lepton, computer.programming_language
Abstract

Using the ARGUS detector at thee+e− storage ring DORIS II, flavour-dependent kaon production inB meson decays has been studied. Using the leptons as flavour tags, it has been possible to separately measure the multiplicities ofK+,K− andKs0 in inclusiveB decays and in semileptonicB decays. The kaon production in semileptonicB decays was further used to estimate the ratio of charmed decays over all decays, and thus also the fraction of charmlessB decays.

Published
1994

27. Observation of γγ → φϱ0 and γγ → φω

Author

H. Wegener, T. Podobnik, V. Lubimov, Sebastian Nowak, I. Korolko, D. Wegener, T. Oest, D. O. Litvintsev, T. Siegmund, C. E.K. Charlesworth, M. Schieber, A. Hüpper, M. Walter, John D. Spengler, D. B. MacFarlane, K. Reim, S. Chechelnitsky, K. Tzamariudaki, Michael Schneider, P. Krieger, B. Spaan, P. Pakhlov, K. Ehret, H. Kapitza, E. Križan, H. Albrecht, R. Mankel, A. Droutskoy, R. Wurth, W. Schmidt-Parzefall, G. Kernel, A. Nau, C. Franki, C. Hast, R. Mundt, Sergey Semenov, Vladislav Balagura, M. Seeger, R. Eckmann, K. W. Edwards, R. Schwierz, A. Lange, H. Schröder, Yu. Zaitsev, S. Werner, T. Kirchhoff, Klaus R. Schubert, Hermann Kolanoski, R. P. Hofmann, P. R.B. Saull, G. Kostina, Thomas Hamacher, H. Thurn, Manfred Paulini, Dave Britton, I. Tichomirov, R. Reiner, P.M. Patel, R. Waldi, R. G. Van de Water, Holger Schulz, S. Khan, T. S. Yoon, E. R.F. Hyatt, A. Lindner, T. Živko, P. Eckstein, Ivan Belyaev, Mikhail Danilov, D. Töpfer, A. Kosche, Yuri Gershtein, A. Snizhko, Werner Hofmann, K. T. Knöpfle, J. D. Prentice, M. Schmidtler, J. Stiewe, D. Reßing, S. Weseler, H. Ehrlichmann, P. Križan, and A. Golutvin

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Argus, Hadron, DESY, computer, Storage ring, computer.programming_language
Abstract

Two-photon production of the hadronic final states K + K − π + π − and K + K − π + π 0 π − has been studied using the ARGUS detector at the e + e − storage ring DORIS II at DESY. The cross sections of the reactions γγ → oϱ 0 and γγ → oω have been measured for the first time. In addition, angular distrubutions have been determined for the reaction γγ → oϱ 0 → K + K − π + π − .

Published
1994

28. Observation of polarization effects in Λc+ semileptonic decay

Author

R. Waldi, I. Korolko, C. Hast, S. Weseler, M. Seeger, A. Lange, Mikhail Danilov, Sebastian Nowak, D. Wegener, O. Mai, H. Ehrlichmann, Holger Schulz, A. Kosche, Ivan Belyaev, H. Kapitza, H. Wegener, R. Eckmann, D. Töpfer, Yu. Gershtein, H. Albrecht, Yu. Zaitsev, S. Werner, Klaus R. Schubert, Thomas Hamacher, H. Kuipers, Werner Hofmann, M. Schmidtler, R. Mankel, J. Stiewe, I. Tichomirov, R. Wurth, K. Tzamariudaki, T. Živko, Michael Schneider, T. Podobnik, P. R. B. Saull, P. Krieger, P. Pakhlov, R. P. Hofmann, T. Kirchhoff, V. Lubimov, J. D. Prentice, T. Siegmund, G. Kostina, D. Reβing, K. Reim, C. Frankl, T. Oest, R. Mundt, R. Reiner, A. Hüpper, H. Thurn, A. Snizhko, A. Nau, Sergey Semenov, S. Chechelnitsky, Hermann Kolanoski, K. Ehret, Vladislav Balagura, A. Droutskoy, P. Križan, H. Schröder, A. Golutvin, M. Walter, P. Eckstein, E. Križnič, D. B. Macfarlane, R. Schwierz, D. O. Litvintsev, W. Schnidt-Parzefall, B. Spaan, T. S. Yoon, J. Spengler, G. Kernel, M. Schieber, R. G. Van de Water, A. Lindner, S. Khan, and K. T. Knöpfle

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Argus, media_common.quotation_subject, Electron–positron annihilation, Elementary particle, Polarization (waves), Asymmetry, Baryon, Nuclear physics, Particle decay, computer, media_common, computer.programming_language
Abstract

Polarization of the Λ daughter baryon from Λc+ → Λl+ vl decay has been measured for the first time using the ARGUS detector at the DORIS II ϵ+ϵ− storage ring. Expressed in terms of the Λc+ semileptonic asymmetry parameter the result is αΛc= −0.91±0.49 for events in the mass region 1.85

Published
1994

29. A study of mixing using partial reconstruction

Author

R. Mundt, R. Waldi, H. Thurn, D. B. MacFarlane, C. Hast, M. Seeger, A. Droutskoy, K. Reim, A. Lange, Rainer Mankel, Manfred Paulini, M. Schmidtler, R. P. Hofmann, P. R.B. Saull, S. Werner, K. R. Schubert, S. Chechelnitsky, D. O. Litvintsev, P. Pakhlov, A. Hüpper, B. Spaan, A. Nau, Sergey Semenov, V. Lubimov, T. Siegmund, T. Kirchhoff, Hermann Kolanoski, I. Korolko, Sebastian Nowak, Holger Schulz, S. Weseler, D. Wegener, K. Ehret, T. Živko, T. S. Yoon, K. T. Knöpfle, W. Schmidt-Parzefall, I. Tichomirov, H. Ehrlichmann, A. Snizhko, G. Kostina, J. D. Prentice, Ivan Belyaev, Thomas Hamacher, P. Krieger, Mikhail Danilov, J. Stiewe, R. Reiner, A. Kosche, J. Spengler, D. Töpfer, Yuri Gershtein, D. Reßing, Werner Hofmann, Vladislav Balagura, H. Albrecht, C. E.K. Charlesworth, G. Kernel, R. Wurth, R. Eckmann, Yu. Zaitsev, K. W. Edwards, H. Wegener, M. Schieber, K. Tzamariudaki, P. M. Patel, M. Walter, H. Kapitza, E. Križnič, T. Podobnik, H. Schröder, M. Schnieder, T. Oest, P. Križan, A. Golutvin, R. G. Van de Water, S. Khan, E. R.F. Hyatt, P. Eckstein, Dave Britton, and A. Lindner

Subjects
Physics, Nuclear and High Energy Physics, Meson, Branching fraction, Electron–positron annihilation, Analytical chemistry, B meson, Atomic physics, Lepton
Abstract

Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have studied the decay B 0 → D ∗+ l − v by exploiting a partial D ∗+ reconstruction technique. The branching ratio for this mode was thereby determined to be (4.5 ± 0.3 ± 0.4)%. Using the corresponding sample of tagged B 0 mesons, we measured the B 0 B 0 mixing parameter to be r d = 0.194 ± 0.062 ± 0.054, a result only weakly dependent upon the ratio of semileptonic widths for and production rates of B 0 and B + mesons. We have also determined the branching ratio Br ( B 0 → X l − v to be (9.3 ± 1.1 ± 1.5)%. By comparing the results for full and partial D ∗+ reconstuction we found the absolute branching ratios for D 0 → K − π + and D 0 → K − π + π + π − to be (4.5 ± 0.6 ± 0.4)% and (7.9 ± 1.5 ± 0.9)%, respectively.

Published
1994

30. Inclusive production ofK *(892),ρ 0, andω(783) mesons in theϒ energy region

Author

R. G. Van de Water, T. S. Yoon, S. Khan, A. Snizhko, C. Hast, W. Schmidt-Parzefall, P. Pakhlov, M. Seeger, A. Lange, I. Korolko, C. E. K. Charlesworth, A. Nau, Sergey Semenov, Hermann Kolanoski, E. Križnič, Sebastian Nowak, D. Wegener, K. Strahl, Vladislav Balagura, I. Tichomirov, S. Weseler, V. Lubimov, P. Križan, A. Golutvin, K. W. Edwards, Michael Schneider, H. Ehrlichmann, Holger Schulz, P. Eckstein, A. Hüpper, T. Oest, D. O. Litvintsev, J. Stiewe, D. Reßing, R. Waldi, H. Wegener, T. Živko, M. Walter, Ivan Belyaev, T. Podobnik, Mikhail Danilov, A. Lindner, B. Spaan, J. D. Prentice, H. Schröder, A. Kosche, Yuri Gershtein, K. Tzamariudaki, E. R.F. Hvatt, D. Töpfer, Peter Krieger, Werner Hofmann, K. Reim, Dave Britton, R. Mundt, H. Thurn, Rainer Mankel, T. Siegmund, M. Schmidtler, Manfred Paulini, P. R. B. Saull, S. Werner, M. Bittner, R. Eckmann, Yu. Zaitsev, D. B. MacFarlane, A. Droutskoy, G. Kostina, R. Reiner, T. Kirchhoff, K. R. Schubert, S. Chechelnitsky, K. Ehret, H. Albrecht, R. Wurth, Thomas Hamacher, V. Soloshenko, H. Kapitza, R. P. Hofmann, K. T. Knöpfle, J. Spengler, G. Kernel, M. Schieber, and P. M. Patel

Subjects
Baryon, Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Elementary particle, Vector meson, Engineering (miscellaneous), Pseudoscalar meson, Gluon
Abstract

The production ofK *+(892),K *0(892),ρ 0(770) andω(783) vector mesons inρ 0(770) events as well as in the gluonic Υ(1S) decays andρ 0(770) decays has been studied using the ARGUS detector. Combining these results with data on pseudoscalar meson, ϕ meson and baryon production collected with the same detector allow comprehensive studies of quark and gluon fragmentation. Model independent information ons quark and vector meson suppression (s/u=0.37±0.04,V/(V+P) π=0.21±0.04 andV/(V+P) K =0.34±0.03)) are derived. The data are compared with predictions from the models Jetset 7.3 and UCLA 7.31.

Published
1994

31. Tracking defect type and strain relaxation in patterned Ge/Si(001) islands by x-ray forbidden reflection analysis

Author

Gilles Renaud, Angelo Malachias, Eero Holmström, Y.-H. Xie, T. H. Metzger, T.-S. Yoon, Vincent Favre-Nicolin, Marie-Ingrid Richard, Kai Nordlund, Jean-Luc Rouvière, Václav Holý, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), European Synchrotron Radiation Facility (ESRF), Laboratoire d'Etude des Matériaux par Microscopie Avancée (LEMMA ), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Myongji University, Helsinki Institute of Physics (HIP), University of Helsinki, University of California [Los Angeles] (UCLA), University of California, Nanostructures et Rayonnement Synchrotron (NRS ), Charles University [Prague] (CU), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, University of California (UC), Institut des Matériaux, de Microélectronique et des Nanosciences de Provence ( IM2NP ), Aix Marseille Université ( AMU ) -Université de Toulon ( UTLN ) -Centre National de la Recherche Scientifique ( CNRS ), European Synchrotron Radiation Facility ( ESRF ), Laboratoire d'Etude des Matériaux par Microscopie Avancée ( LEMMA ), Modélisation et Exploration des Matériaux ( MEM ), Institut Nanosciences et Cryogénie ( INAC ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Grenoble Alpes ( UGA ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Grenoble Alpes ( UGA ) -Institut Nanosciences et Cryogénie ( INAC ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Grenoble Alpes ( UGA ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Grenoble Alpes ( UGA ), Helsinki Institute of Physics ( HIP ), University of Helsinki [Helsinki], University of California at Los Angeles [Los Angeles] ( UCLA ), Nanostructures et Rayonnement Synchrotron ( NRS ), and Charles University [Prague]

Subjects
Materials science, Condensed matter physics, Scattering, Relaxation (NMR), 02 engineering and technology, Type (model theory), 021001 nanoscience & nanotechnology, Condensed Matter Physics, Epitaxy, 01 natural sciences, Crystallographic defect, Electronic, Optical and Magnetic Materials, Quantum dot, 0103 physical sciences, Thin film, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, Crystal twinning, [ PHYS.COND ] Physics [physics]/Condensed Matter [cond-mat]
Abstract

Plastic relaxation and formation of defects are crucial issues in the epitaxial growth of nanoparticles and thin films. Indeed, defects generate local stress in the crystalline lattice, which affects their surroundings and may lead to undesired effects such as reduced charge-carrier lifetime or nonradiative recombinations. Here, we use a nondestructive method based on x-ray diffuse scattering close to forbidden reflections to identify the defect types with a high sensitivity and quantify their average size and strain field. Combined with transmission electron microscopy, it offers opportunities to track both ensemble average and single defects inside three-dimensional structures. These techniques have been applied to partially embedded and high-Ge-content (x{sub Ge}=0.87{+-}0.06) dots selectively grown in 20-nm-sized pits on Si(001) surfaces through openings in a SiO{sub 2} template. The stress in the 20-nm-wide Ge islands is relaxed not only by interfacial dislocations but also by microtwins and/or stacking faults located at the interface, proving the importance of {l_brace}111{r_brace} planes and twinning in the relaxation process of nanometer-size Ge dots.

Published
2011

32. Investigation of the decays $$\bar B^0 \to D^{* + } \ell ^ - \bar v$$ and $$\bar B \to D^{**} \ell ^ - \bar v$$

Author

T. Siegmund, K. Strahl, Vladislav Balagura, A. Nau, Sergey Semenov, Hermann Kolanoski, P. Pakhlov, P. Križan, S. Werner, C. E. K. Charlesworth, V. Lubimov, A. Golutvin, W. Schmidt-Parzefall, M. Bittner, D. B. MacFarlane, G. Kostina, Mikhail Danilov, C. Hast, J. D. Prentice, A. Lange, P. R. B. Saull, A. Droutskoy, H. Schröder, Manfred Paulini, E.R.F. Hyatt, K. W. Edwards, Yuri Gershtein, R. P. Hofmann, Ivan Belyaev, T. S. Yoon, R. Reiner, Holger Schulz, Peter Krieger, E. Križnič, T. Oest, Werner Hofmann, I. Tichomirov, Michael Schneider, M. Schieber, R. G. Van de Water, R. Waldi, Thomas Hamacher, V. Soloshenko, T. Živko, D. Töpfer, M. Schmidtler, A. Walther, H. Wegener, S. Khan, H. Albrecht, B. Spaan, R. Mundt, W. Funk, T. Podobnik, K. R. Schubert, S. Chechelnitsky, R. Wurth, Yu. Zaitsev, H. Thurn, T. Kirchhoff, K. Tzamariudaki, A. Hüpper, K. Ehret, H. Kapitza, Fedor Ratnikov, R. D. Appuhn, P. Eckstein, S. Weseler, Dave Britton, P. M. Patel, H. Ehrlichmann, J. Spengler, M. Walter, K. Reim, G. Kernel, Rainer Mankel, Sebastian Nowak, D. Wegener, K. T. Knöpfle, J. Stiewe, A. Lindner, D. Reßing, V. Shibaev, and I. V. Gorelov

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, High Energy Physics::Phenomenology, Elementary particle, High Energy Physics::Experiment, Engineering (miscellaneous), computer, Astrophysics::Galaxy Astrophysics, computer.programming_language, Bar (unit)
Abstract

Exclusive semileptonicB decays with aD *+ meson in the final state have been studied using the ARGUS detector at the DORIS II storage ring. The branching ratio for the decay $$\bar B^0 \to D^{* + } \ell ^ - \bar v$$ , where l- is eithere − or μ-, has been measured to be (5.2±0.5±0.6)%. A significant rate for the decay $$\bar B \to D^{**} \ell ^ - \bar v$$ has been observed. From an angular analysis of the cascade $$\bar B^0 \to D^{* + } ( \to D^0 \pi ^ + )\ell ^ - \bar v$$ the forward-backward asymmetryA FB and theD *+ polarization parameter α have been determined to beA FB=0.20±0.08±0.06 and α=1.1±0.4±0.2.

Published
1993

33. Observation of a new charmed baryon

Author

P. Krieger, J. D. Prentice, R. Waldi, K. W. Edwards, K. T. Knöpfle, Ivan Belyaev, A. Hüpper, I. Korolko, E. Križnič, P. R. B. Saull, K. Tzamariudaki, K. Strahl, R. Mundt, Vladislav Balagura, V. Lubimov, B. Spaan, J. Stiewe, H. Thurn, K. R. Schubert, A. Snizhko, T. Siegmund, S. Chechelnitsky, Sebastian Nowak, H. Schröder, S. Werner, D. Wegener, D. Töpfer, D. B. Macfarlane, Dmitry Litvintsev, M. Bittner, K. Reim, Thomas Hamacher, H. Wegener, G. Kernel, Dave Britton, K. Ehret, T. Podobnik, H. Kapitza, Holger Schulz, E.R.F. Hyatt, I. Tichomirov, M. Schieber, W. Schmidt-Parzefall, M. Walter, A. Nau, Rainer Mankel, Sergey Semenov, Manfred Paulini, P. M. Patel, Hermann Kolanoski, S. Weseler, C. Hast, C. E. K. Charlesworth, T. Živko, P. Križan, A. Golutvin, R. Eckmann, Yu. Zaitsev, M. Seeger, R. P. Hofmann, H. Ehrlichmann, A. Lange, G. Kostina, T. Kirchhoff, P. Pakhlov, John D. Spengler, M. Schmidtler, R. Reiner, Yu. Gershtein, A. Lindner, Mikhail Danilov, Michael Schneider, H. Albrecht, R. Wurth, A. Droutskoy, A. Kosche, D. Reβing, Werner Hofmann, T. Oest, P. Eckstein, T. S. Yoon, R. G. Van de Water, and S. Khan

Subjects
Nuclear physics, Physics, Baryon, Nuclear and High Energy Physics, Argus, Branching fraction, Electron–positron annihilation, Elementary particle, Charge (physics), DESY, computer, Storage ring, computer.programming_language
Abstract

Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have observed a new charmed baryon state in the channel Λc+π+π−. (All references to a specific charged state also imply the charge conjugate state.) The mass of this state was measured to be (2626.6 ± 0.5 ± 1.5) MeV/c2. The product of the production cross section and branching ratio for this channel was determined to be (11.5 ± 2.5 ± 3.0) pb, and the natural width estimated to be smaller than 3.2 MeV/c2 at 90% CL.

Published
1993

34. A determination of two Michel parameters in purely leptonic tau decays

Author

D. Reβing, Yu. Gershtein, V. Lubimov, A. Nau, Sergey Semenov, Hermann Kolanoski, K. Reim, Rainer Mankel, K. T. Knöpfle, H. Schröder, S. Weseler, Dave Britton, T. S. Yoon, J. D. Prentice, K. Strahl, Vladislav Balagura, H. Ehrlichmann, C. Hast, H. Kapitza, M. Seeger, A. Lange, M. Schmidtler, A. Lindner, Michael Schneider, M. Schieber, P. Krieger, E.R.F. Hyatt, M. Walter, Andreas Kirchhoff, Ivan Belyaev, R. Waldi, A. Droutskoy, R. Mundt, P. Eckstein, D. O. Litvintsev, D. Töpfer, B. Spaan, W. Funk, H. Thurn, R. G. Van de Water, Holger Schulz, S. Khan, G. Kernel, P. R. B. Saull, T. Živko, Thomas Hamacher, V. Soloshenko, T. Siegmund, P. Pakhlov, R. P. Hofmann, K. R. Schubert, Manfred Paulini, S. Chechelnitsky, K. Tzamariudaki, K. Ehret, W. Schmidt-Parzefall, G. Kostina, C. E. K. Charlesworth, R. Reiner, H. Wegener, P. M. Patel, I. Tichomirov, R. Eckmann, Yu. Zaitsev, T. Podobnik, S. Werner, M. Bittner, A. Hüpper, Fedor Ratnikov, T. Oest, Mikhail Danilov, A. Kosche, Werner Hofmann, A. Snizhko, John D. Spengler, H. Albrecht, R. Wurth, Sebastian Nowak, D. Wegener, E. Križnič, D. B. Macfarlane, P. Križan, A. Golutvin, K. W. Edwards, and J. Stiewe

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Argus, Muon, Electron–positron annihilation, Elementary particle, Electron, Spectral line, Nuclear physics, Momentum, Michel parameters, computer, computer.programming_language
Abstract

Using the ARGUS detector at the e+e− storage ring DORIS II, we have determined the Michel parameters ϱ and ξ of τ → μν ν and τ → eν ν decays. From a data sample with 333 events/pb around s = 10 GeV , we select 3230 events e + e − → τ + τ − → (μ ± μ μ )( e ǂv v ) and determine ϱ from the e and μ momentum spectra and ξ from the correlations between e and μ momenta. For ϱ we obtain ϱτ→e = 0.79 ± 0.08 ± 0.06 and ϱτ→μ = 0.76 ± 0.08 in accordance with the V - A structure of the decays. The momentum correlations are only sensitive to the product ξτ→eξτ→μ. Setting ξτ→e = ξτ→μ, we obtain |ξτ| = 0.90 ± 0.15 ± 0.10 also in accordance with V - A. The updated decay fractions are B(τ → e v v ) = (17.5 ± 0.3 ± 0.5)% and B(τ → μv v ) = (17.4 ± 0.3 ± 0.5)% .

Published
1993

35. A partial wave analysis of the decay D0 → KS0π+π−

Author

R. Mundt, J. Stiewe, D. Reßing, H. Thurn, G. Kostina, K. Reim, V. Shibaev, A. Hüpper, V. Lubimov, Rainer Mankel, R. Reiner, A. Nau, Sergey Semenov, Hermann Kolanoski, Holger Schulz, M. Schmidtler, J. Tamminga, A. Walther, D. B. MacFarlane, Fedor Ratnikov, C. Hast, T. Kirchhoff, W. Schmidt-Parzefall, K. R. Schubert, A. Lange, T. Živko, K. T. Knöpfle, A. Droutskoy, R. G. Van de Water, S. Weseler, I. V. Gorelov, I. Tichomirov, S. Khan, K. Ehret, H. Ehrlichmann, P. Pakhlov, Sebastian Nowak, R. P. Hofmann, D. Wegener, T. S. Yoon, E.R.F. Hyatt, Peter Krieger, Mikhail Danilov, K. W. Edwards, John D. Spengler, Ivan Belyaev, H. Albrecht, Werner Hofmann, R. Wurth, K. Strahl, P. R. B. Saull, Vladislav Balagura, C. E. K. Charlesworth, D. Töpfer, Michael Schneider, T. Siegmund, M. Schieber, Manfred Paulini, H. Kapitza, P. M. Patel, A. Lindner, G. Kernel, H. Wegener, Thomas Hamacher, V. Soloshenko, T. Podobnik, M. Walter, T. Oest, H. Schröder, B. Spaan, W. Funk, R. D. Appuhn, K. Tzamariudaki, P. Križan, A. Golutvin, Dave Britton, E. Križnič, P. Murat, R. Waldi, J. D. Prentice, S. Werner, and Yu. Zaitsev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Pion, Pair production, Meson, Branching fraction, Partial wave analysis, Excited state, Analytical chemistry, Dalitz plot
Abstract

Using the ARGUS detector at the DORIS-II electron-positron storage ring at DESY, we have investigated the exclusive decay D ∗+ → D 0 π + , D 0 → K S 0 π + π − . From a partial wave analysis of the KS0π+π− system we find that (71.8± 4.2 ± 3.0)% are D 0 → K ∗− π + and (22.7 ± 3.2 ± 0.9)% are D 0 → K 0 ϱ 0 with a relative phase of (−137 ± 7 ± 3)° between the channels. The remaining fraction can be described by several channels involving excited resonances, but not by a three-body phase space decay, thus giving first evidence for D0 decays into K 0 ∗ (1430) − π + , K 0 f 0 (1975), K 0 f 2 (1270) , and K 0 f 0 (1400) .

Published
1993

36. Inclusive production of η′ (958) andf o (975) mesons in the υ energy region

Author

V. Lubimov, Mikhail Danilov, W. Schmidt-Parzefall, Ivan Belyaev, H. Wegener, T. Podobnik, H. Albrecht, A. Kosche, J. Stiewe, R. P. Hofmann, R. Wurth, T. Oest, D. Reßing, J. Spengler, J. D. Prentice, D. Töpfer, C. Hast, C. E. K. Charlesworth, M. Seeger, T. S. Yoon, A. Lange, Werner Hofmann, D. B. MacFarlane, A. Lindner, I. Tichomirov, G. Kernel, A. Droutskoy, K. Strahl, Vladislav Balagura, T. Siegmund, H. Kapitza, R. D. Appuhn, M. Walter, G. Kostina, R. Waldi, M. Schieber, Michael Schneider, P. Eckstein, R. G. Van de Water, A. Zimmermann, Yu. Zaitsev, S. Werner, M. Bittner, S. Khan, A. Hüpper, R. Reiner, Yu. Gershtein, Manfred Paulini, P. M. Patel, I. V. Gorelov, P. Pakhlov, A. Walther, T. Kirchhoff, Fedor Ratnikov, E.R.F. Hyatt, Dave Britton, H. Schröder, K. W. Edwards, E. Križnič, Thomas Hamacher, V. Soloshenko, V. Shibaev, B. Spaan, W. Funk, A. Nau, K. T. Knöpfle, Sergey Semenov, Peter Krieger, P. R. B. Saull, K. R. Schubert, S. Chechelnitsky, Hermann Kolanoski, K. Ehret, S. Nowack, P. Križan, A. Golutvin, Holger Schulz, D. Wegener, T. Živko, R. Mundt, M. Schmidtler, H. Thurn, K. Reim, Rainer Mankel, S. Weseler, H. Ehrlichmann, and K. Tzamariudaki

Subjects
Physics, Particle physics, Argus, Annihilation, Physics and Astronomy (miscellaneous), Meson, Octet, Electron–positron annihilation, Nuclear physics, Pseudoscalar, Vector meson, Singlet state, Engineering (miscellaneous), computer, computer.programming_language
Abstract

The inclusive production cross sections of η′ (958) andf o (975) mesons are measured ine + e − annihilation in the nonresonant continuum around $$\sqrt s = 10$$ GeV and in decays of the υ resonances using the ARGUS detector. For η′ (958) mesons, a production ratio of η′ (958)/ηdir=0.35±0.24, with ηdir=η−BR(η′→ηX)·η′, is determined in direct υ(1S) decays, which can be partially explained by the pseudoscalar singlet/octet mixing. Forf o (975) production, we obtain a production ratio off o (975)/p(770)°=0.17±0.030 in direct υ(1S) decays. In its production features, thef o (975) behaves like an ordinary meson, though aK $$\bar K$$ molecule nature cannot be excluded. The substantial production yield of thef o (975) meson demonstrates the important effect of feeddown from mesons beyond the basic multiples on pseudoscalar and vector meson production.

Published
1993

37. Inclusive production of charged pions, kaons and protons in υ(4S) decays

Author

P. Pakhlov, Leif J. Jönsson, T. Oest, I. V. Gorelov, Holger Schulz, Sebastian Nowak, P. R. B. Saull, E. Križnič, E.R.F. Hyatt, D. Wegener, M. Schmidtler, Mikhail Danilov, K. W. Edwards, H. Schröder, H. Wegener, T. Živko, Werner Hofmann, A. Hüpper, T. Podobnik, V. Shibaev, Manfred Paulini, H. Kapitza, R. G. Van de Water, C. Hast, R. Mundt, Fedor Ratnikov, K. Strahl, Vladislav Balagura, K. T. Knöpfle, Ivan Belyaev, A. Lindner, M. Reidenbach, J. Stiewe, A. Lange, D. Reßing, V. Lubimov, S. Khan, D. Töpfer, K. Tzamariudaki, H. Thurn, Michael Schneider, P. Murat, S. Weseler, M. Walter, H. Ehrlichmann, P. Križan, A. Golutvin, W. Schmidt-Parzefall, H. I. Cronström, D. B. MacFarlane, R. P. Hofmann, A. Hölscher, R. Waldi, T. Siegmund, T. S. Yoon, A. Droutskoy, A. Nau, Sergey Semenov, K. Reim, Peter Krieger, C. E. K. Charlesworth, Hermann Kolanoski, Sally Seidel, S. Werner, Rainer Mankel, J. D. Prentice, Dave Britton, Yu. Zaitsev, B. Spaan, W. Funk, I. Tichomirov, R. D. Appuhn, Thomas Hamacher, V. Soloshenko, A. Walther, John D. Spengler, H. Albrecht, R. Wurth, T. Kirchhoff, K. R. Schubert, K. Ehret, G. Kostina, R. Reiner, M. Schieber, P. M. Patel, and G. Kernel

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Nuclear Theory, Hadron, Particle identification, Momentum, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract

Using the detector ARGUS at thee + e − storage ring DORIS II, we have investigated inclusive momentum spectra of charged pions, kaons, and protons from decays of the υ(4S) meson. The kaon spectra have been measured in two independent ways, by coherently exploiting the detector's particle identification capabilities, and by detecting decays in-flight. The extracted mean multiplicities for charged hadrons are 7.17±0.05±0.14 pions, 1.56±0.03±0.05 kaons and 0.110±0.010±0.007 protons per υ(4S) decay, where pions and protons fromK and Δ decays have been subtracted.

Published
1993

38. Observation of semileptonic decay

Author

P. Murat, Sally Seidel, R. Waldi, S. Weseler, John D. Spengler, A. Lindner, M. Walter, Holger Schulz, H. Albrecht, J. Stiewe, R. Wurth, H. Ehrlichmann, H. I. Cronström, T. Živko, M. Schieber, B. Spaan, W. Funk, A. Nau, Sergey Semenov, T. Kirchhoff, Hermann Kolanoski, R. Mundt, K. T. Knöpfle, Thomas Hamacher, V. Soloshenko, S. Werner, K. Reim, Mikhail Danilov, P. Krieger, H. Thurn, P. Križan, A. Golutvin, P. R. B. Saull, J. D. Prentice, V. Shibaev, A. Hölscher, R. D. Appuhn, Rainer Mankel, R. P. Hofmann, W. Schmidt-Parzefall, M. Schmidtler, C. Hast, E. Križnič, Manfred Paulini, C. E. K. Charlesworth, H. Schröder, D. Reβing, P. Pakhlov, K. W. Edwards, A. Lange, K. R. Schubert, Werner Hofmann, A. Hüpper, D. B. Macfarlane, Dave Britton, T. Siegmund, I. V. Gorelov, Fedor Ratnikov, M. Reidenbach, A. Walther, K. Ehret, P. M. Patel, G. Kernel, I. Tichomirov, G. Kostina, Yu. Zaitsev, R. Reiner, Michael Schneider, K. Strahl, Vladislav Balagura, V. Lubimov, Ivan Belyaev, D. Töpfer, H. Kapitza, Leif J. Jönsson, A. Droutskoy, T. Oest, E.R.F. Hyatt, H. Wegener, T. Podobnik, Sebastian Nowak, D. Wegener, R. G. Van de Water, S. Khan, K. Tzamariudaki, and T. S. Yoon

Subjects
Semileptonic decay, Physics, Nuclear and High Energy Physics, Argus, Physics::Instrumentation and Detectors, Branching fraction, High Energy Physics::Phenomenology, DESY, Nuclear physics, Baryon, High Energy Physics::Experiment, computer, Storage ring, computer.programming_language
Abstract

Observation of the semileptonic decay of the charmed baryon in the decay channel has been made using the ARGUS detector at the e + e − storage ring DORIS II at DESY. The cross section times branching ratio was found to be .

Published
1993

39. Search for rareB meson decays intoD s + mesons

Author

Manfred Paulini, Dave Britton, S. Weseler, B. Spaan, W. Funk, R. D. Appuhn, P. Eckstein, H. Ehrlichmann, M. Walter, K. T. Knöpfle, T. S. Yoon, Holger Schulz, A. Walther, G. Kernel, Peter Krieger, G. Kostina, T. Živko, Sebastian Nowak, K. Reim, D. Wegener, R. Waldi, R. G. Van de Water, Yu. Gershtein, Yu. Zaitsev, I. V. Gorelov, T. Siegmund, S. Werner, Rainer Mankel, R. Mundt, H. Schröder, M. Schmidtler, J. D. Prentice, S. Khan, H. Thurn, Mikhail Danilov, K. Strahl, R. Reiner, Vladislav Balagura, I. Tichomirov, T. Oest, M. Bittner, R. P. Hofmann, P. Pakhlov, K. Tzamariudaki, E. Križnič, H. Wegener, M. Schieber, T. Podobnik, D. B. MacFarlane, P. R. B. Saull, Werner Hofmann, K. R. Schubert, A. Droutskoy, S. Chechelnitsky, J. Stiewe, A. Hüpper, V. Shibaev, P. M. Patel, D. Reßing, Fedor Ratnikov, A. Nau, Sergey Semenov, Hermann Kolanoski, K. Ehret, T. Kirchhoff, P. Križan, A. Golutvin, A. Lindner, John D. Spengler, H. Albrecht, R. Wurth, Thomas Hamacher, V. Soloshenko, E.R.F. Hyatt, K. W. Edwards, C. Hast, A. Lange, Ivan Belyaev, Michael Schneider, D. Töpfer, H. Kapitza, W. Schmidt-Parzefall, C. E. K. Charlesworth, and V. Lubimov

Subjects
Quark, Physics, Argus, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Resonance, Coupling (probability), Nuclear physics, High Energy Physics::Experiment, B meson, Engineering (miscellaneous), computer, computer.programming_language
Abstract

A search has been performed for rareB meson decays intoD − mesons arising fromb→u transitions,W exchange modes,B + annihilation processes, and decays where theD + is not produced via aW→c $$\bar s$$ quark pair coupling, using the ARGUS detector operating on the Ψ(4S) resonance at thee + e − storage ring DORIS II. Upper limits for individual decay modes are obtained. In addition, from a study ofD + l- correlations an upper limit of BR (B→D + l- X) (90% CL) is determined.

Published
1993

40. Analysis of the decayτ - →π - π - π + v τ and determination of thea 1(1260) resonance parameters

Author

S. Werner, K. T. Knöpfle, D. B. MacFarlane, A. Droutskoy, M. Bittner, R. Mundt, A. Walther, Sebastian Nowak, Ivan Belyaev, T. S. Yoon, D. Wegener, J. Stiewe, H. Thurn, John D. Spengler, C. Hast, A. Lindner, A. Lange, D. Reßing, T. Siegmund, Yu. Zaitsev, K. R. Schubert, H. Schröder, S. Chechelnitsky, H. Albrecht, D. Töpfer, Holger Schulz, J. D. Prentice, G. Kernel, B. Spaan, W. Funk, R. Wurth, K. Ehret, H. Wegener, A. Nau, V. Shibaev, T. Živko, R. G. Van de Water, Sergey Semenov, Hermann Kolanoski, S. Khan, G. Kostina, T. Podobnik, W. Schmidt-Parzefall, R. P. Hofmann, K. Strahl, Vladislav Balagura, P. Pakhlov, Peter Krieger, K. Reim, H. Kapitza, C. E. K. Charlesworth, Manfred Paulini, E. Križnič, R. Waldi, Michael Schneider, V. Lubimov, T. Kirchhoff, Dave Britton, I. V. Gorelov, Rainer Mankel, E.R.F. Hyatt, M. Schmidtler, K. W. Edwards, R. D. Appuhn, P. R. B. Saull, P. Eckstein, M. Walter, T. Oest, Thomas Hamacher, V. Soloshenko, S. Weseler, H. Ehrlichmann, R. Reimer, K. Tzamariudaki, P. Križan, A. Golutvin, M. Schieber, P. M. Patel, Mikhail Danilov, Yuri Gershtein, Werner Hofmann, A. Hüpper, Fedor Ratnikov, and I. Tichomirov

Subjects
Physics, Argus, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Dalitz plot, Resonance, Elementary particle, Intermediate state, Atomic physics, Engineering (miscellaneous), computer, computer.programming_language
Abstract

Using the ARGUS detector at the DORIS IIe +e− storage ring we have studied the three-pion hadronic final state in the decay τ- → π-π-π+ v τ. From about 7500 events we conclude that the three-pion system is dominated by theJ P=1+ resonancea 1 (1260) decaying preferentially via ρ0π-. Our data restrict a possible ρπ contribution of three-pion states without intermediate resonances to less than 6% at 95% CL. Fitting a model by Isgur et al. to the data yields $$m_{a_1 } = (1.211 \pm 0.007 \pm _{0.0}^{0.050} ) GeV/c^2 $$ and $$\Gamma _{a_1 } = (0.446 \pm 0.0021 \pm _{0.0}^{0.140} ) GeV/c^2 $$ . The second errors reflect the model dependence of the result. This is the currently most significant determination of thea 1 resonance parameters. The ratio ofS- andD-wave amplitudes for the ρ0π- intermediate state of thea 1 − decay at the nominala 1 − mass was found to beD/S=−0.11±0.02. Using thisD/S ratio we update our former measurement of the parity violating asymmetry parameter $$\gamma _{AV} = 2g_A g_V /(g_A^2 + g_V^2 )$$ to 1.25±0.23± 0.08 0.15 . The branching ratio of the decay τ- → π-π-π+ v τ is determined to be Br(τ- → π-π-π+ v τ)=(6.8±0.1±0.5)%.

Published
1993

41. ChemInform Abstract: (1R,2R)-(-)-N,N′-Bis (3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamine: A Salen Ligand of Jacobsen′s Catalyst

Author

Jae Woong Yoon, T.-S. Yoon, and Whanchul Shin

Subjects
chemistry.chemical_compound, Jacobsen's catalyst, chemistry, Hydrogen bond, Salen ligand, Intramolecular force, General Medicine, Medicinal chemistry
Abstract

In the title compound, C 36 H 54 N 2 O 2 , two salicylideneimine moieties are situated nearly perpendicular to each other so that one of them has to be rotated for complexation. There are O-H...N intramolecular hydrogen bonds in both salicylideneimine moieties.

Published
2010

42. Observation of the decay

Author

H. Schröder, P. R. B. Saull, M. Schieber, J. D. Prentice, K. Strahl, Vladislav Balagura, S. Werner, A. Droutskoy, Ivan Belyaev, P. Pakhlov, Mikhail Danilov, T. S. Yoon, G. Kostina, Manfred Paulini, R. P. Hofmann, I. Tichomirov, A. Walther, A. Linder, R. Reiner, V. Shibaev, K. R. Schubert, C. Hast, M. Walter, R. G. Van de Water, K. Reim, Werner Hofmann, K. W. Edwards, T. Siegmund, Dave Britton, H. Wegener, H. I. Cronström, A. Hüpper, A. Lange, D. Töpfer, P. Krieger, S. Khan, Michael Schneider, K. Ehret, Fedor Ratnikov, T. Podobnik, Holger Schulz, P. Murat, E. Križnič, Rainer Mankel, B. Spaan, W. Funk, T. Kirchhoff, M. Schmidtler, Sebastian Nowak, K. Tzamariudaki, W. Schmidt-Parzefall, R. Waldi, D. Wegener, K. T. Knöpfle, T. Živko, H. Kapitza, C. E. K. Charlesworth, I. V. Gorelov, D. B. Macfarlane, R. D. Appuhn, V. Lubinov, R. Mundt, John D. Spengler, G. Kernel, Leif J. Jönsson, P. Križan, A. Golutvin, H. Albrecht, D. Reβing, H. Thurn, P. M. Patel, J. Stiewe, T. Oest, S. Weseler, R. Wurth, E.R.F. Hyatt, Yu. Zaitsev, H. Ehrlichmann, A. Nau, Sergey Semenov, Hermann Kolanoski, Thomas Hamacher, and V. Soloshenko

Subjects
Physics, Nuclear and High Energy Physics, Argus, Meson, Electron–positron annihilation, Analytical chemistry, Value (computer science), DESY, Excited state, Mass spectrum, Atomic physics, computer, Storage ring, computer.programming_language
Abstract

Using the ARGUS detector at the e + e - storage ring using DORIS II at DESY, we have observed a new decay channel for the excited charm-strange meson D s1 (2536) + →D∗ O K + . The production cross section for the D s 1 (2536) + decaying via this channel is measured to be σ ( D s1 (2536) + )· BR (D sl (2536) + →D∗ 0 K + )= 18±4±3 pb at E CM = 10.4 GeV. The mass of the D s 1 (2536) + is found to be 2535.2 ± 0.5±1.5 MeV/ c 2 in agreement with the value obtained from an analysis of the D s1 (2536) + →D∗ + K 0 s decay channel. The natural width is determined to be less than 3.9 MeV/ c 2 at 90%CL.

Published
1992

43. A measurement of the tau mass

Author

G. Kernel, M. Schieber, V. Shibaev, S. Semenov, Leif J. Jönsson, V. Lubimov, H. Schröder, D. Wegener, D. Reβing, R. Wurth, C. Hast, J. Stiewe, T. Oest, P. Križan, G. Kostina, K. Reim, A. Lange, T. Kirchhoff, S. Werner, Michael Schneider, A. Droutskoy, H. Albrecht, H. Wegener, E. Križnič, W. Funk, R. P. Hofmann, M. Schmidtler, T. Podobnik, H.D. Schulz, R. Reiner, J. D. Prentice, Sebastian Nowak, A. Walther, M. Danilov, K. Strahl, Vladislav Balagura, Ivan Belyaev, W. Schmidt-Parzefall, R. Mankel, K. T. Knöpfle, K. R. Schubert, C. E. K. Charlesworth, S. Weseler, I. Tichomirov, P. Murat, D. Töpfer, R. Mundt, R. Waldi, K. W. Edwards, R. D. Appuhn, H. Ehrlichmann, H. Thurn, K. Ehret, P. Krieger, R. G. Van de Water, E.R.F. Hyatt, A. Nau, P. M. Patel, A. Golutvin, H. Kapitza, Hermann Kolanoski, S. Khan, Dave Britton, P. Pakhlov, Yu. Zaitsev, J. Spengler, T. S. Yoon, M. Walter, H. I. Cronström, I. Gorelov, T. Živko, Werner Hofmann, A. Hüpper, K. Tzamariudaki, P. R. B. Saull, F. Ratnikov, A. Lindner, T. Siegmund, Manfred Paulini, B. Spaan, Thomas Hamacher, and V. Soloshenko

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, Mass spectrum, computer, Storage ring, Lepton, computer.programming_language
Abstract

Using the ARGUS detector at the DORIS II storage ring, a new measurement of the mass of the τ lepton has been obtained. An analysis of the tau pseudomass spectrum for decays of the type τ− → π−π−π+ντ finds mτ = 1776.3±2.4±1.4 MeV/c2. This result also leads to an improvement of the upper limit on the ντ mass to mντ < 31 MeV/c2 at the 95% confidence level.

Published
1992

44. A measurement of σtot(γp) at

Author

Ada Solano, S. Limentani, M. Z. Wang, G.A. Blair, A. Seidman, Stan Bentvelsen, D. Haun, Giuseppe Iacobucci, S. Kartik, Francois Corriveau, A. Kotański, P. Morawitz, S. Kasai, A. Cassidy, M. Nakahata, Marco Schioppa, P. G. Pelfer, S.J.P. Smith, K. U. Pösnecker, J. Nash, U. Schneekloth, T. Neumann, T. Barillari, Y. Eisenberg, M. M. Mobayyen, R. Seidlein, A. Mass, Roberto Casalbuoni, S. Kitamura, P.F. Ermolov, H. F.W. Sadrozinski, A. Shapira, Fernando Barreiro, D. Monaldi, K. Heinloth, R. Casaccia, H. Müsch, P. Cloth, J. Kochocki, Mauro Morandin, Z. Jakubowski, Giuseppe Levi, I. Gialas, R. Imlay, Rosario Nania, S. De Jong, S. Magill, A. Prinias, K. Jelen, Ulf Behrens, Federico Cindolo, H. Kowalski, F. Ciralli, W. Koch, F. J. Sciulli, A. Hofmann, Tadeusz Kowalski, C.J.S. Morgado, A. Freidhof, Michele Arneodo, N.C. Roocroft, S. Kramarczyk, L. W. Hung, J. Engelen, G. Poelz, James Crittenden, A. Dannemann, G. Sartorelli, A Furtjes, F. Gasparini, A. A. Savin, J. F. Labs, L. Suszycki, A. Bargende, W. Dorth, F. Dal Corso, J. Straver, L. Hagge, N. Dyce, Tobias M. Haas, T. Hasegawa, A. Leich, A. Margotti, Roberto Carlin, Shoichi Yamada, R.C.E. Devenish, Debades Bandyopadhyay, D. Revel, A. A. Voronin, T. Ishii, B. Lisowski, T. J. Llewellyn, A. Stopczyński, C. Voci, Silvia Maselli, M. Momayezi, G. Laurenti, G. Barbagli, G. Cara Romeo, E. Tscheslog, S. Nagayama, R. Ayed, R. L. Talaga, S. Bhadra, F. Ikraiam, G. Cases, R. Yoshida, B.D. Burow, I. Butterworth, T. Kȩdzierski, Y. Iga, J. M. Pawlak, A. Vorvolakos, D. McQuillan, A. Zichichi, Matthias Kasemann, R. Timellini, A. Dake, D. Notz, C. Nemoz, K. Muchorowski, N. H. Brook, T.L. Short, R. R. McNeil, Ta Romanowski, Daniele Dominici, R. Wedemeyer, J.D. Prentice, E. Barberis, Samuel Silverstein, K. Charchuła, P. Erhard, Jens Hartmann, T. W. Jones, Anna Goussiou, M. Löwe, R. Loveless, U. Mallik, T. Khatri, J.W. Mitchell, Greg P Heath, L. Chen, Eduardo Ros, R. J. Cashmore, G. L. Bashindzhagyan, R. J. Teuscher, M. Geerts, K. Blankenship, Luis Labarga, J. J. Whitmore, M. Derrick, T. Tymieniecka, Danuta Kisielewska, C.R. Sampson, R. J. Seifert, P.M. Hallam-Baker, H. Dabbous, M. de Kamps, N. Pavel, G. Grzelak, J. F. Martin, P. Kooijman, F. F. Wilson, M. Chiarini, U. Kötz, Vivian O'Dell, H. J. Kim, T. C. Bacon, M. Lomperski, Stefano Maria Mari, R. Gläser, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, A. Francescato, C. Youngman, Hideki Okuno, W. Burkot, R. J. Nowak, S. De Pasquale, J.K. Mayer, S. Schlenstedt, I. Laakso, M. Brkic, J. K. Bienlein, R. Szwed, D. Shaw, P. J. Bussey, S. Qian, G. D'Agostini, Ben Bylsma, B. Lu, J. Milewski, J. Krüger, J. F. de Trocóniz, M. Nuti, J. Schroeder, H. Chaves, Masashi Hazumi, L. Zawiejski, T. Y. Ling, P. de Jong, Q. Lin, Inkyu Park, F. Benard, G. Zech, S. De Curtis, H. Hartmann, Y. Nakamitsu, Katsuo Tokushuku, Giovanni Abbiendi, M.I. Ferrero, R. J. Tapper, Robert Klanner, M. Rohde, N. A. McCubbin, T. S. Yoon, K. Wick, B. Musgrave, I. Fleck, Thomas Trefzger, A.G. Tenner, H.-P. Jakob, H. van der Lugt, Umberto Dosselli, J.B. Lane, E. Paul, David Cussans, Janusz Chwastowski, K. Sugano, Rr Rau, R. Brugnera, L. S. Durkin, J. N. Lim, A. Contin, W. Weihs, D. J. Gilkinson, V. A. Kuzmin, D. C. Bailey, E. A. De Wolf, G. Jahnen, Claudia Glasman, Sridhara Dasu, M. De Giorgi, Halina Abramowicz, K. Stojda, W. Metcalf, F. Turkot, R. Stanek, U. Holm, S. Mengel, J. Mainusch, Gm Levman, B. Gutjahr, Luca Stanco, C. Markou, M. Adamus, G. Marini, B. Löhr, E. Badura, M. Kückes, Np Zotov, A.K. Wróblewski, A. Bamberger, C. Rethfeldt, W. Schott, F. Selonke, E. Hilger, T. Bienz, G. Bruni, S. D'Auria, P. Joos, Cd Catterall, R. Heifetz, F. Arzarello, M. Rost, A. Meyer, B. Foster, F. W. Bullock, Mariusz Flasiński, Luisa Cifarelli, M. Krzyżanowski, A. Byrne, Neville Harnew, J. Roldán, B. Schneider, M. Lancaster, D.D. Reeder, A. Montag, B. Diekmann, B.Y. Oh, E. Rulikowska-Zarȩbska, Krzysztof Piotrzkowski, J.A. Zakrzewski, C. A. Heusch, C. Raine, P. Nylander, J. Leslie, J. Del Peso, T. Watanabe, C. Li, Lucia Votano, E. Lohrmann, Kr Long, C. Fordham, G. Castellini, M. Zachara, H. Kreutzmann, L.E. Sinclair, J. C. Vermeulen, M. Mattioli, R. van Woudenberg, G. Theisen, U. Karshon, Lothar At Bauerdick, T. Woeniger, L. Lamberti, F.S. Chlebana, K.M. Furutani, M.B. Crombie, H. Uijterwaal, P.M. Patel, A.F. Żarnecki, W. Schulz, Luis Hervas, D. Boscherini, W.N. Murray, G. Anzivino, G. Susinno, M. Nakao, P. Borzemski, R. S. Orr, P. B. Straub, E.E. Ronat, B. Behrens, Nicolo Cartiglia, J. Ciborowski, R. Ullmann, S. Yang, V.A. Jamieson, M. Dardo, C. Coldewey, R.S. Gilmore, H.J. Grabosch, B. Krebs, F. Zetsche, J. L. Thron, D. Lüke, T. Poser, M. Bonori, Maurizio Basile, S. Nickel, L. Bellagamba, D. B. Miller, J. Gajewski, T. Massam, J. Biltzinger, A.H. Walenta, H. Hultschig, H. Kammerlocher, B. H. Wiik, John Hart, I. Ali, Wr Frisken, S. Ritz, D. S. Hanna, L.W. Wiggers, Masami Chiba, G. Maccarrone, Klaus Kurt Desch, C. Del Papa, I. McArthur, P. Bruni, Costas Foudas, L.W. Mo, Michele Guida, Jose Repond, W. H. Smith, A. Caldwell, G.G. Stairs, G. Gloth, Mário Costa, U. Contino, T. Tsurugai, E. McCliment, J.C. Giddings, D.M. Gingrich, A. Seiden, F. Frasconi, M. Przybycień, F. Palmonari, S.S. Wilson, D. Zer-Zion, A. T. Doyle, A.M. Khan, R. Schattevoy, G. Bari, J.-L. Schneider, W. Vogel, P. Luffman, K. Eskreys, T.P. Shah, D. H. Saxon, J.S.T. Ng, P. Göttlicher, B. Hubbard, M. Ptacek, Aharon Levy, J.R. Forbes, K.W. McLean, D. Krakauer, A. Ladage, S. Söldner-Rembold, M. Iori, A. Nigro, Y. Nagasawa, A. Dwuraźny, J. Mollen, H.F. Fawcett, E.N. Kuznetsov, O. Mańczak, G. F. Hartner, U. Camerini, A. M. Cooper-Sarkar, S. Dagan, R. Walczak, Yu. A. Golubkov, H. Tiecke, M. Posocco, Geoffrey Smith, Detlef Filges, D. K. Hasell, K. O'Shaughnessy, A. Kruse, J. Shulman, R. Salomon, Juan Terron, M. Kasprzak, P. Giusti, G. Drews, J. A. Parsons, W. Hain, K. Dierks, J. M. Butterworth, J. Zaja̧c, B. Nizioł, A. Eskreys, S. K. Park, Amedeo Staiano, Tachishige Hirose, M. Kuze, R. Hamatsu, J. Kulka, L. Wai, P.L. Makkar, R. Stroili, C. Peroni, M. Roco, G. Geitz, W. Kröger, Dg Stairs, J. Malos, and C. Fanin

Subjects
Physics, Nuclear and High Energy Physics, ZEUS (particle detector), Photon, High Energy Physics::Phenomenology, Nuclear Theory, Detector, Virtual particle, HERA, Particle detector, Particle scattering, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Nuclear Experiment
Abstract

The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q2 values of the virtual photons are in the range 10−7

Published
1992

45. A new determination of theB 0 $$\bar B^0 $$ oscillation strength

Author

Manfred Paulini, Holger Schulz, C. Geyer, C. Hast, Mikhail Danilov, T. Živko, R. Waldi, A. Lange, A. Krüger, R. G. Van de Water, B. Fominykh, John D. Spengler, A. Walther, R. Mundt, D. Wegener, H. Albrecht, T. Siegmund, A. Semenov, S. Khan, S. Ball, J. C. Gabriel, Werner Hofmann, H. Thurn, R. Wurth, Sally Seidel, J. Stiewe, D. Reßing, Leif J. Jönsson, Thomas Hamacher, V. Soloshenko, P. Pakhlov, T. Oest, V. Shevchenko, I. Tichomirov, S. Weseler, Peter Krieger, H. Schröder, W. Schmidt-Parzefall, Robert K. Kutschke, G. Herrera, K. Strahl, Vladislav Balagura, C. E. K. Charlesworth, B. Holzer, P. Križan, V. Lubimov, H. Ehrlichmann, E. Križniĉ, A. Golutvin, Fedor Ratnikov, A. Nau, Sergey Semenov, A. Hölscher, M. Reidenbach, C. W. Darden, Hermann Kolanoski, D. B. MacFarlane, Yu. Zaitsev, R. Childers, A. Droutskoy, H. Wegener, K. T. Knöpfle, K. Tzamariudaki, H. I. Cronström, T. Podobnik, J. D. Prentice, A. Nippe, T. S. Yoon, K. Reim, S. Werner, B. Boŝtjanĉiĉ, Rainer Mankel, A. Rostovtsev, I. V. Gorelov, B. Spaan, W. Funk, R. D. Appuhn, M. Schäfer, Georgios Tsipolitis, Dave Britton, F. Sefkow, R. S. Orr, U. Volland, G. Kernel, K. R. Schubert, M. Schieber, A. Lindner, P. M. Patel, D. Töpfer, Stefan Schael, H. Kapitza, and K. W. Edwards

Subjects
Physics, Argus, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Elementary particle, DESY, Nuclear physics, Engineering (miscellaneous), computer, Storage ring, Lepton, Bar (unit), computer.programming_language
Abstract

Using the ARGUS detector at thee+e− storage ring DORIS II at DESY, a study ofB0\(\bar B^0 \) oscillations has been performed using three different techniques. Besides the standard dilepton method, charge correlations betweenD* mesons and one or two leptons have also been investigated. The mixing parameterr is determined to be (20.6±7.0)%.

Published
1992

46. Measurement of exclusive one-prong and inclusive three-prong branching ratios of the τ lepton

Author

B. Holzer, K. T. Knöpfle, P. Pakhlov, H. Schröder, K. Reim, Mikhail Danilov, Stefan Schael, Leif J. Jönsson, A. Semenov, H. Kapitza, Peter Krieger, Rainer Mankel, J. C. Gabriel, B. Fominykh, D. Wegener, K. Strahl, Vladislav Balagura, S. Weseler, Robert K. Kutschke, R. S. Orr, T. Oest, P. Križan, R. Mundt, H. Ehrlichmann, G. Herrera, V. Lubimov, U. Volland, Werner Hofmann, A. Golutvin, D. Töpfer, A. Hölscher, H. Thurn, K. Tzamariudaki, H. I. Cronström, C. W. Darden, A. Nau, Sergey Semenov, A. Lindner, E. Križnič, Georgios Tsipolitis, C. Geyer, C. Hast, Hermann Kolanoski, R. Waldi, Dave Britton, Holger Schulz, A. Nippe, H. Wegener, A. Lange, Manfred Paulini, I. V. Gorelov, K. W. Edwards, F. Sefkow, T. Podobnik, J. Stiewe, J. D. Prentice, Fedor Ratnikov, D. Reßing, T. Živko, W. Schmidt-Parzefall, M. Reidenbach, S. C. Seider, R. D. Appuhn, T. S. Yoon, M. Schäfer, K. B. Schubert, T. Siegmund, S. Ball, B. Spaan, W. Funk, A. Krüger, R. G. Van de Water, C. E. K. Charlesworth, S. Khan, M. Schieber, S. Werner, P. M. Patel, A. Rostovtsev, G. Kernel, Yu. Zaitsev, B. Boštjančič, Thomas Hamacher, V. Soloshenko, A. Walther, John D. Spengler, H. Albrecht, R. Wurth, V. Shevchenko, I. Tichomirov, D. B. MacFarlane, R. Childers, and A. Droutskoy

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Branching (polymer chemistry), Engineering (miscellaneous), computer, Charged particle, computer.programming_language, Lepton
Abstract

Using the ARGUS detector at the DORIS II storage ring, we have studied τ decays with one or three charged particles in the final state, obtaining the following values for the branching ratios: BR(τ−→e − $$\bar v_e v_\tau $$ )=(17.3±0.4±0.5)% BR(τ−→μ− $$\bar v_\mu v_\tau $$ )=(17.2±0.4±0.5)%,BR(τ−→π− v π)+BR(τ−→K − v π)=(11.7±0.6±0.8)% and BR(π−→3-prong)=(13.3±0.3±0.8)%. These measurements confirm the present world averages with a precision, in each case, comparable to the error on the combination of all previous results.

Published
1992

47. Measurement of the decayτ − →ρ − ν τ

Author

G. Kernel, J. D. Prentice, J. Stiewe, W. Schmidt-Parzefall, M. Schieber, K. T. Knöpfle, P. M. Patel, S. Werner, Mikhail Danilov, K. Ehret, C. Hast, Michael Schneider, Thomas Hamacher, V. Soloshenko, T. Zivko, H. Schröder, K. Strahl, Vladislav Balagura, H. Wegener, P. Murat, Manfred Paulini, R. D. Appuhn, T. Podobnik, Peter Krieger, C. E. K. Charlesworth, Werner Hofmann, D. Ressing, A. Hüpper, T. Kirchhoff, A. Lange, T. S. Yoon, G. Kostina, I. V. Gorelov, Leif J. Jönsson, H. Kapitza, Fedor Ratnikov, Holger Schulz, T. Oest, T. Siegmund, Dave Britton, Richard George van de Water, R. Reiner, P. Krizan, V. Shibaev, Yu. Zaitsev, D. B. MacFarlane, Ivan Belyaev, Sameen Ahmed Khan, A. Droutskoy, H. Albrecht, I. Tikhomirov, R. Mankel, R. Wurth, V. Lyubimov, P. R. B. Saull, B. Spaan, W. Funk, M. Walter, A. Walther, D. Töpfer, H. I. Cronström, A. Golutvin, A. Lindner, E. Kriznic, R. Waldi, R. P. Hofmann, Klaus R. Schubert, E.R.F. Hyatt, K. W. Edwards, Sebastian Nowak, D. Wegener, A. Nau, Sergey Semenov, Hermann Kolanoski, P. Pakhlov, S. Weseler, H. Ehrlichmann, M. Schmidtler, R. Mundt, H. Thurn, K. Reim, K. Tzamariudaki, and J. Spengler

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Coupling (probability), Pion, Tau neutrino, Invariant mass, Engineering (miscellaneous), computer, computer.programming_language, Spin-½
Abstract

An analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring. The branching ratio has been determined to be Br(τ-→π-π0vτ=(22.6±0.4±0.9)%. The shape of the π-π0 invariant mass spectrum is found to be in good agreement with the predictions obtained using the conserved vector current (CVC) hypothesis, suggesting that the π-π0 system is produced in aJP=1− state. An analysis of the measured decay angular distribution of the pions with respect to the flight direction of the π-π0 system demonstrates the vector nature of the coupling at the τvτ vertex. With the assumption of zerovτ mass thevτ spin has been shown to be\(J_{v_\tau}= \tfrac{1}{2} \).

Published
1992

48. The measurement ofD s + andD + meson decays into $$K*^ + \bar K*^0 $$

Author

J. Stiewe, D. Reßing, V. Lubimov, K. Reim, R. S. Orr, W. Schmidt-Parzefall, C. W. Darden, K. Strahl, Vladislav Balagura, U. Volland, B. Holzer, Holger Schulz, Rainer Mankel, Sally Seidel, G. Herrera, K. R. Schubert, A. Rostovtsev, Fedor Ratnikov, K. Tzamariudaki, T. Živko, S. Weseler, M. Reidenbach, A. Walther, Yu. Zaitsev, S. Werner, H. Albrecht, E. Križnič, R. Wurth, R. Mundt, H. Ehrlichmann, M. Schieber, Mikhail Danilov, D. Wegener, A. Krüger, R. G. Van de Water, C. E. K. Charlesworth, B. Fominykh, A. Nau, Sergey Semenov, A. Nippe, Thomas Hamacher, P. M. Patel, Hermann Kolanoski, V. Soloshenko, S. Khan, Leif J. Jönsson, K. T. Knöpffe, H. Thurn, Werner Hofmann, Robert K. Kutschke, T. Oest, T. S. Yoon, I. Tichomirov, P. Pakhlov, P. Križan, A. Golutvin, B. Boštjančič, V. Shevchenko, J. Spengler, H. Wegener, A. Hölscher, T. Podobnik, Stefan Schael, H. Kapitza, Peter Krieger, G. Kernel, I. Goreloy, K. W. Edwards, T. Siegmund, S. Ball, Manfred Paulini, D. Töpfer, A. Lindner, H. Schröder, H. I. Cronström, J. D. Prentice, R. Waldi, D. B. MacFarlane, R. Childers, A. Droutskoy, A. Semenov, J. C. Gabriel, C. Geyer, C. Hast, A. Lange, B. Spaan, W. Funk, Georgios Tsipolitis, Dave Britton, F. Sefkow, R. D. Appuhn, and M. Schäfer

Subjects
Nuclear physics, Physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, D meson, Analytical chemistry, Mass spectrum, Engineering (miscellaneous)
Abstract

Using the ARGUS detector at thee + e − storage ring DORIS II at DESY, we have observed the decaysD +→K − K 0π+π+ andD + →K − K 0π+π+. The branching ratios were determined to be BR(D +→K − K 0π+π+)=(1.0±0.5±0.3)% and BR(D + →K − K 0π+π+)/BR(D + →φπ+)=1.2±0.2±0.2. These decays are found to proceed mostly via the $$\bar K*^0 K*^ + $$ decay channel, with BR(D +→ $$\bar K*^0 K*^ + $$ )=2.6±0.8±0.7)% and BR(D + → $$\bar K*^0 K*^ + $$ )/BR(D + →φπ+)=1.5±0.4±0.4.

Published
1992

49. Evidence for the production of the charmed, doubly strange baryon Ωc in e+e− annihilation

Author

Sebastian Nowak, T. Kirchhoff, C. Hast, S. Kahn, D. Wegener, R. P. Hofmann, A. Lange, M. Walter, R. G. Van de Water, T. Siegmund, V. Lubimov, H. I. Cronström, T. S. Yoon, I. Tichomirov, H. Schröder, I. V. Gorelov, V. Shibaev, W. Schmidt-Parzefall, E. Križnič, J. Stiewe, S. Weseler, John D. Spengler, P. M. Patel, D. Reßing, P. R. B. Saull, H. Wegener, C. E. K. Charlesworth, H. Albrecht, K. W. Edwards, D. B. Macfarlane, K. Strahl, Vladislav Balagura, Manfred Paulini, T. Podobnik, R. Wurth, K. Tzamariudaki, H. Ehrlichmann, Thomas Hamacher, K. T. Knöpfle, V. Soloshenko, A. Lindner, J. D. Prentice, Yu. Zaitsev, P. Križan, A. Golutvin, U. Becker, G. Kernel, A. Hölscher, Leif J. Jönsson, A. Droutskoy, A. Walther, M. Schmidtler, M. Schieber, T. Oest, S. Werner, E.R.F. Hyatt, K. Reim, Ivan Belyaev, Rainer Mankel, Mikhail Danilov, D. Töpfer, P. Murat, A. Nau, R. Waldi, H. Kapitza, Sergey Semenov, Hermann Kolanoski, P. Krieger, Werner Hofmann, A. Hüpper, Fedor Ratnikov, M. Reidenbach, Michael Schneider, P. Pakhlov, Sally Seidel, Holger Schulz, T. Živko, R. Mundt, H. Thurn, R. D. Appuhn, G. Kostina, B. Spaan, W. Funk, Dave Britton, R. Reiner, K. R. Schubert, and K. Ehret

Subjects
Physics, Nuclear and High Energy Physics, Argus, Particle physics, Annihilation, Branching fraction, Electron–positron annihilation, DESY, lcsh:QC1-999, Baryon, Nuclear physics, Production (computer science), computer, lcsh:Physics, Storage ring, computer.programming_language
Abstract

Using the detector ARGUS at the storage ring DORIS II of DESY, we have found evidence for the production of the charmed and doubly strange baryon Ω c through its decay channel Ξ − K − π + π + . Its mass has been determined to be ((2719.0±7.0±2.5)MeV/ c 2 , and the product of production cross section and branching ratio the above channel to be (2.41±0.90±0.30) pb.

Published
1992

50. Search for neutrinoless τ decays

Author

Mikhail Danilov, Michael Schneider, Sebastian Nowak, J. Stiewe, V. Lubimov, K. T. Knöpfle, K. Reim, Peter Krieger, M. Walter, D. B. MacFarlane, D. Reßing, W. Schmidt-Parzefall, Holger Schulz, B. Spaan, W. Funk, D. Wegener, K. R. Schubert, Sally Seidel, Werner Hofmann, Rainer Mankel, G. Kernel, V. Shibaev, G. Herrera, H. Schröder, C. E. K. Charlesworth, Ivan Belyaev, Križnič, A. Droutskoy, M. Schieber, R. D. Appuhn, S. Weseler, T. Živko, P. Murat, K. Tzamariudaki, M. Schäfer, A. Hüpper, P. M. Patel, P. Pakhlov, K. Ehret, H. Ehrlichmann, A. Nippe, R. Waldi, C. Hast, Leif J. Jönsson, T. S. Yoon, A. Lange, Fedor Ratnikov, Manfred Paulini, M. Reidenbach, A. Nau, M. Schmidtler, Sergey Semenov, I. V. Gorelov, P. Križan, A. Golutvin, H. I. Cronström, Hermann Kolanoski, T. Oest, D. Töpfer, J. D. Prentice, A. Hölscher, R. Mundt, K. Strahl, Vladislav Balagura, H. Wegener, A. Krüger, D. L. Britton, R. G. Van de Water, Thomas Hamacher, V. Soloshenko, H. Thurn, T. Podobnik, S. Khan, P. R. B. Saull, T. Siegmund, G. Kostina, H. Kapitza, E.R.F. Hyatt, K. W. Edwards, A. Lindner, Yu. Zaitsev, S. Werner, I. Tichomirov, John D. Spengler, H. Albrecht, R. Wurth, and A. Walther

Subjects
Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Elementary particle, Baryon number, Quantum field theory, Engineering (miscellaneous), Lepton
Abstract

Upper limits on branching ratios for six neutrinoless leptonic, 16 semileptonic, two radiative-leptonic, two radiative-hadronic and three purely hadronic τ decays have been determined. The results improve over previously published ones by about a factor of two. For the first time the lepton and baryon number violating decays\(\tau ^ - \to \bar p\gamma ,\tau ^ - \to \bar p\pi ^0 \) and\(\tau ^ - \to \bar p\eta \) have been investigated. The 90% confidence level (CL) limits for the corresponding branching ratios amount to 2.9×10−4, 6.6×10−4 and 1.3×10−3 respectively.

Published
1992

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