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1. Metallic reactive materials application in fragmentation warhead

Author

Y. J. Chen, Zh F. Liang, J. Chen, X. Li, T. Zhou, and Ch Xiao

Subjects
Metal, History, Materials science, Warhead, visual_art, visual_art.visual_art_medium, Fragmentation (weaponry), Photochemistry, Computer Science Applications, Education, Reactive material
Abstract

The composition, structure, manufacturing process and properties of Metallic reactive materials are introduced. The typical ternary mixture of Ni-Al-W have high density of 7.37g/cm3 and static tensile strength of 228MPa, which make the reactive fragments gain high penetration capability to perforate the target&s skin and can survive under explosive. The Ni-Al-W fragments undergo intermetallic reaction and oxidation reaction upon impacting. The energy release characteristics of Ni-Al-W reactive material were analysed. The chemical energy and pressure generated by reaction of the reactive material have a linear relationship with the impact velocity. A warhead prototype of Ni-Al-W fragment warhead was designed and the warhead explosion testing was carried out. The results show that the Ni-Al-W fragments are capable of withstanding to explosive loading with acquiring initial velocity of 2256m/s. The Ni-Al-W fragments also have advantage of perforation in area against the bi-layered space plates. The metallic reactive fragment warhead can increase the lethality of fragmentation warheads against aircrafts and phased array antenna, which increasingly get mature and have a wide application prospect.

Published
2020
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2. Prediction of three-dimensional elastic behavior of filament-wound composites based on the bridging model

Author

H. Ch Xiao, D. M. Yin, and B. M. Li

Subjects
Protein filament, History, Materials science, Bridging model, Composite material, Computer Science Applications, Education
Abstract

With the high specific stiffness, specific strength and designable ability, filament-wound composites have been widely applied in many industries, such as aerospace, energy and transportation, and they are also the one of more ideal choices for the lightweight structural design of weapon system. However, their complex structures, which including the cross-overs, undulations, and overlaps between different winding passages of the fiber bundles, make it difficult to obtain their macro mechanical properties. And this work will provide a method to predict the three-dimensional equivalent elastic properties of the filament-wound composites based on the multi-scale homogenization principle. The representative volume element (RVE) in the meso-scale is defined on the basis of the filament winding pattern, which characterizes all the micro-architecture details of the filament wound composites, such as fiber undulation, winding angle and lamination arrangement. Referring to the principle of volume average in the analysis method of braided composites, a theoretical prediction model for the three-dimensional equivalent elastic constants of the filament wound composites is established by adopting the bridging model. Through this method, the results obtained for the previous experimental model are in good agreement with the experimental ones, which verifies the reliability of this model. In addition, the effects of some winding parameters, such as winding angle, on the equivalent elastic behavior of the filament-wound composites are analyzed. And the rules gained can provide a theoretical reference for the optimum design of filament-wound composites. The full version of this extended abstract will appear in Defence Technology in 2020.

Published
2020
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3. AN IMPROVED MEASUREMENT OF ELECTROWEAK COUPLINGS FROM E+E--]E+E- AND E+E--]MU+MU

Author

K. Lübelsmeyer, H. M. Fischer, Gl Salmon, M. Wollstadt, R. J. Cashmore, T. D. Jones, H. U. Martyn, T. Barklow, Walter Dr. Hillen, D. H. Saxon, D. Trines, E.E. Ronat, W. Koch, G. Peise, H. Siebke, B. Foster, D. M. Binnie, U. Kötz, Guenter Wolf, M. Althoff, D. Notz, G. Poelz, J. McCardle, D. A. Garbutt, T. R. Wyatt, Michael Dittmar, G. Yekutieli, R.C.E. Devenish, Georg Zobernig, A. Jocksch, Y. Eisenberg, G. Knop, W. Braunschweig, T. Kracht, D. Strom, W. Wallraff, H. Hartmann, Hermann Kolanoski, J. K. Sedgbeer, M. Rushton, A. Shapira, Norbert Wermes, K. Gather, A. Ladage, G. Rudolph, H. Kück, H. Kowalski, H. Venkataramania, J. Harvey, J. Proudfoot, R. Wedemeyer, H. Burkhardt, J. Pyrlik, C. Youngman, I. C. Brock, G. Mikenberg, D. K. Hasell, E. Hilger, R. Beuselinck, A. Caldwell, Ch. Xiao, C. Jenkins, Ehud Duchovni, D. Pandoulas, Joseph Izen, M. G. Bowler, D. R. Quarrie, F. J. Kirschfink, M. Holder, P. Grossmann, B. Löhr, H. Hultschig, K. W. Bell, P. Mättig, P. Joos, W. G. Jones, P. L. Woodworth, J. Rimkus, B. H. Wiik, W. Schütte, John Hart, E. Wicklund, Sau Lan Wu, W. A. T. Wan Abdullah, Fernando Barreiro, P. E. L. Clarke, P. Rosskamp, M. Mermikides, D. Revel, R. Mir, Hl Krasemann, L. Köpke, M. Cherney, E. Lohrmann, B. Neumann, H. G. Sander, D.W. Schmitz, U. Karshon, P. J. Dornan, A. J. Campbell, R. Fohrmann, Juergen Thomas, D. Lüke, S. L. Llyod, and P. Leu

Subjects
Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Electroweak interaction, Elementary particle, Weinberg angle, Fermion, Nuclear physics, Pair production, High Energy Physics::Experiment, Engineering (miscellaneous), Bhabha scattering, Lepton
Abstract

We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and μ pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry of the μ pairs was measured to be −0.098±0.023±0.005. The data were found to agree well with the standard theory of electroweak interaction giving sin2θW=0.27±0.07. The leptonic weak couplings were determined to begv=0.000±0.170 andgA=−0.481±0.055. The data were also used to investigate a class of composite models for leptons.

Published
2016

4. Measurement of the radiative width of the η′(958) in two-photon interactions

Author

B. Löhr, K. Lübelsmeyer, P. Joos, D.W. Schmitz, E. Wicklund, R.C.E. Devenish, P. J. Dornan, Y. Eisenberg, W. G. Jones, W. Braunschweig, R. Fohrmann, H. U. Martyn, V. Mertens, M. Holder, H. Hultschig, C. M. Hawkes, D. Strom, H. M. Fischer, M. Rushton, B. H. Wiik, John Hart, Ch. Xiao, Guenter Wolf, G. Rudolph, G. Yekutieli, T. Kracht, R. J. Cashmore, G. Baranko, T. Tymieniecka, M. Takashima, Sau Lan Wu, Philip Bull, U. Kötz, R. Mir, H. Kück, D. A. Garbutt, R. J. Nowak, H. Siebke, M. Winik, Georg Zobernig, M. Dittmar, C. Jenkins, H. Kowalski, G. Kreutz, D. Trines, J. Harvey, G. Poelz, E. Lohrmann, P. Grossmann, K. U. Pösnecker, A. Ladage, T. D. Jones, B. Foster, D. M. Binnie, M. Althoff, J. McCardle, D. Notz, W. Wallraff, W. Schütte, K. Gather, A. Shapira, Fernando Barreiro, J. Eisenmann, G. Mikenberg, D. Pandoulas, F. J. Kirschfink, R. Beuselinck, W. A. T. Wan Abdullah, H. Venkataramania, Hermann Kolanoski, E.E. Ronat, D. K. Hasell, J. Pyrlik, P. E. L. Clarke, E. Hilger, R. Wedemeyer, G. Knop, M. Mermikides, D. Revel, Joseph Izen, H. Hartmann, L. Köpke, M. Cherney, J. Thomas, K. W. Bell, P. Mättig, A. Jocksch, S. Brandt, K. J. Sedgbeer, M. G. Bowler, Hl Krasemann, C. Youngman, H. G. Sander, P. Rosskamp, Ehud Duchovni, A. Eskreys, A. Caldwell, Stephen Lloyd, B. Neumann, U. Karshon, D. H. Saxon, G. E. Forden, D. Lüke, S. Ritz, and P. Leu

Subjects
Physics, Nuclear and High Energy Physics, Two-photon excitation microscopy, Product (mathematics), Transverse momentum, Radiative transfer, State (functional analysis), Limit (mathematics), Atomic physics
Abstract

The reaction e + e − →e + e − η ′(958) has been observed by detecting the final state π + π − γ . The two-photon width of the η′ has been measured to be Γ ( η ′→ γγ ) = 5.1±0.4±0.7 keV. A search for the ι (1440) has been made in the ϱ 0 γ final state. An upper limit has been obtained for the product Γ ( ι (1440) → γ ) gg ), B ( ι → ϱ 0 γ )

Published
1984
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5. Observation of hard processes in collisions of two quasi-real photons

Author

Walter Dr. Hillen, G. Peise, A. Shapira, J. McCardle, D. Lüke, H. Kück, K. Gather, D. Trines, W. Schütte, G. Yekutieli, Fernando Barreiro, G. E. Forden, Giora Mikenberg, R. Beuselinck, W. Wallraff, Philip Bull, H. U. Martyn, D.W. Schmitz, Hermann Kolanoski, V. Mertens, Gl Salmon, J. K. Sedgbeer, R.C.E. Devenish, M. Wollstadt, W. G. Jones, P. J. Dornan, J. Harvey, M. Dittmar, D. Strom, D. Pandoulas, M. Rushton, K. Lübelsmeyer, R. Fohrmann, G. Rudolph, M. Mermikides, D. Revel, T. Kracht, P. L. Woodworth, R. Mir, C. Youngman, B. Löhr, Y. Eisenberg, H. Siebke, A. Ladage, P. Grossmann, W. Braunschweig, T. R. Wyatt, P. Joos, J. Rimkus, B. Foster, C. M. Hawkes, Norbert Wermes, P. Leu, E. Wicklund, H. Kowalsi, Jakita O. Thomas, H. Venkataramania, D. H. Saxon, C. Jenkins, Rj Cashmore, W. Koch, W. A. T. Wan Abdullah, M. G. Bowler, J. Pyrlik, M. Althoff, D. Notz, E. Hilger, D. M. Binnie, U. Kötz, L. Köpke, P. E. L. Clarke, M. Cherney, Ehud Duchovni, G. Poelz, A. Jocksch, K. W. Bell, P. Mättig, D. A. Garbutt, H. G. Sander, R. J. Nowak, H. Hartmann, J. Proudfoot, Ch. Xiao, T. Barklow, Alan Campbell, M. Holder, H. Hultschig, B. H. Wiik, John Hart, Sau Lan Wu, E.E. Ronat, G. Knop, P. Rosskamp, R. Wedemeyer, F. J. Kirschfink, H. M. Fischer, A. Caldwell, Stephen Lloyd, Georg Zobernig, D. K. Hasell, Joseph Izen, D. R. Quarrie, Gy. Wolf, B. Neumann, U. Karshon, E. Lohrmann, Tegid Jones, and Hl Krasemann

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Photon, Angular distribution, Yield (chemistry), Hadron, High Energy Physics::Experiment, Electron, Nuclear Experiment, Term (time)
Abstract

Hard processes in photon-photon collisions are studied using high statistics data without requiring an electron tag. A high yield of hadrons with p t in the range 1.5–3.0 GeV/ c is observed. This yield exceeds the expectation of the Born term by a factor of four.

Published
1984
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6. The production and decay of Tau leptons ine + e ? annihilation at PETRA energies

Author

J. McCardle, A. Caldwell, K. Gather, Stephen Lloyd, T. D. Jones, Y. Eisenberg, R. Beuselinck, P. Dauncey, W. Wallraff, Philip Bull, Malte Hildebrandt, D.W. Schmitz, W. Braunschweig, P. Rosskamp, J. Harvey, Ehud Duchovni, M. Holder, C. M. Hawkes, H. Hultschig, P. J. Dornan, A. J. Campbell, H. U. Martyn, R. Wedemeyer, G. Baranko, B. H. Wiik, John Hart, Sau Lan Wu, V. Mertens, C. Youngman, A. Ladage, R. Fohrmann, A. Eskreys, E. Lohrmann, Michael Dittmar, G. Yekutieli, D. Pandoulas, G. Poelz, M. Althoff, J. Eisenmann, P. Grossmann, B. Neumann, T. Tymieniecka, Gy. Wolf, D. Notz, K. U. Pösnecker, H. M. Fischer, U. Kötz, H. Venkataramania, D. A. Garbutt, W. G. Jones, U. Karshon, R. J. Nowak, P. Leu, D. H. Saxon, R.C.E. Devenish, J. Pyrlik, H. Kowalski, C. Jenkins, Rj Cashmore, F. J. Kirschfink, E. Hilger, G. Kreutz, A. Shapira, Hl Krasemann, E.E. Ronat, M. G. Bowler, G. Knop, H. Kück, H. Siebke, D. Lüke, S. Ritz, D. M. Binnie, P. L. Woodworth, K. Lübelsmeyer, H. Hartmann, D. Strom, M. Rushton, G. Rudolph, Ch. Xiao, A. Jocksch, Stephanie Brandt, Georg Zobernig, T. Kracht, M. Takashima, W. A. T. Wan Abdullah, P. E. L. Clarke, D. K. Hasell, Joseph Izen, G. E. Forden, G. Mikenberg, M. Cherney, J. Thomas, W. Schütte, Fernando Barreiro, K. W. Bell, P. Mättig, D. Trines, M. Mermikides, D. Revel, R. Mir, Hermann Kolanoski, J. K. Sedgbeer, B. Löhr, P. Joos, B. Foster, E. Wicklund, and D. J. Mellor

Subjects
Nuclear physics, Physics, Particle decay, Pair production, Pion, Annihilation, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Engineering (miscellaneous), Charged particle, Lepton
Abstract

We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters beingΛ +>161 GeV andΛ −169 GeV (95% CL). The topological branching fraction of the τ to 1 charged particle,B 1, is 0.847±0.011 (stat) −0.013 +0.016 (syst) and no decays to 5 charged particles were observed resulting inB 5

Published
1985
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7. Photon pair production bye + e ? annihilation and search for supersymmetric photinos at energies greater than 40 GeV

Author

J. Harvey, C. Youngman, W. Schütte, Fernando Barreiro, H. U. Martyn, H. Venkataramania, J. Pyrlik, E. Hilger, H. Siebke, W. G. Jones, G. Baranko, M. Mermikides, D. Revel, M. Winik, V. Mertens, Ehud Duchovni, H. Kück, D. M. Binnie, A. Jocksch, F. J. Kirschfink, G. Poelz, A. Eskreys, T. D. Jones, R. Rosskamp, M. Cherney, E.E. Ronat, H. M. Fischer, Stephanie Brandt, A. Ladage, W. A. T. Wan Abdullah, P. D. Dauncey, R.C.E. Devenish, J. Thomas, T. Tymieniecka, Michael Dittmar, G. Yekutieli, G. Knop, P. Grossmann, R. Wedemeyer, B. Neumann, A. Caldwell, D. Pandoulas, Stephen Lloyd, U. Kötz, J. McCardle, H. Kowalski, P. E. L. Clarke, Georg Zobernig, R. Mir, D. A. Garbutt, M. G. Bowler, K. Gather, M. Holder, H. Hultschig, D. H. Saxon, B. H. Wiik, R. Beuselinck, R. J. Nowak, John Hart, Sau Lan Wu, U. Karshon, T. Kracht, Giora Mikenberg, D. K. Hasell, E. Lohrmann, K. U. Pösnecker, C. Jenkins, Rj Cashmore, K. Lübelsmeyer, Gy. Wolf, J. Eisenmann, A. Shapira, Joseph Izen, Y. Eisenberg, Ch. Xiao, W. Braunschweig, G. E. Forden, Hl Krasemann, K. W. Bell, P. Mättig, C. M. Hawkes, D. Strom, D. Trines, M. Rushton, G. Rudolph, Hermann Kolanoski, J. K. Sedgbeer, G. Kreutz, D. Lüke, S. Ritz, H. Hartmann, D.W. Schmitz, M. Althoff, P. J. Dornan, D. Notz, R. Fohrmann, M. Takashima, B. Löhr, P. Joos, B. Foster, E. Wicklund, D. J. Mellor, P. Leu, W. Wallraff, and Philip Bull

Subjects
Physics, Nuclear physics, Cross section (physics), Particle physics, Selectron tube, Photon, Missing energy, Annihilation, Pair production, Physics and Astronomy (miscellaneous), High Energy Physics::Experiment, Engineering (miscellaneous), Photino
Abstract

The cross section for the processe + e −→γγ has been measured for c.m. energies 39.5 61 GeV and Λ+> GeV (95% confidence level) have been determined. A search for two photon final states with missing energy provided lower limits on the masses of the photino and selectron.

Published
1984
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8. Upper limits on the production rate of the decuplet baryons Δ andΣ* ine + e − annihilation at 34.4 GeV

Author

H. Siebke, M. Winik, C. Youngman, H. M. Fischer, W. G. Jones, R. Riethmüller, H. Venkataramania, J. Pyrlik, H. Kowalski, E. Hilger, M. Takashima, Ehud Duchovni, R.C.E. Devenish, R. J. Cashmore, P. L. Woodworth, T. Tymieniecka, D. Trines, J. McCardle, E.E. Ronat, U. Kötz, H. U. Martyn, B. Löhr, M. G. Bowler, Stephanie Brandt, Philip Bull, D. A. Garbutt, A. Eskreys, R. J. Nowak, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, P. Joos, K. Gather, J. Harvey, Georg Zobernig, G. Knop, D. Pandoulas, W. A. T. Wan Abdullah, T. Kracht, G. Mikenberg, H. Hartmann, R. Beuselinck, P. Schmüser, P. E. L. Clarke, C. Jenkins, E. Wicklund, Gy. Wolf, K. W. Bell, P. Mättig, U. Karshon, W. Scütte, A. Caldwell, V. Mertens, Stephen Lloyd, A. Jocksch, K. H. Mess, A. Ladage, G. Baranko, T. D. Jones, G. Poelz, M. Althoff, Ch. Xiao, D. K. Hasell, G. Kreutz, P. Rosskamp, D. Notz, P. J. Dorman, H. Kück, K. U. Pösnecker, B. Foster, D. M. Binnie, P. Grossmann, Joseph Izen, R. Wedemeyer, D. Strom, A. Shapira, K. Lübelsmeyer, M. Rushton, G. Rudolph, B. Neumann, F. J. Kirschfink, M. Holder, H. Hultschig, Michael Dittmar, B. H. Wiik, John Hart, G. Yekutieli, Sau Lan Wu, Y. Eisenberg, W. Braunschweig, C. M. Hawkes, Fernando Barreiro, E. Lohrmann, J. Eisenmann, Hl Krasemann, M. Mermikides, D. Revel, R. Mir, D. H. Saxon, L. Köpke, M. Cherney, P. Leu, J. Thomas, H. G. Sander, G. E. Forden, D. Lüke, S. Ritz, D.W. Schmitz, A. J. Campbell, and R. Fohrmann

Subjects
Physics, Nuclear physics, Baryon, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Octet, Electron–positron annihilation, Invariant mass, Strangeness, Spectral line, Production rate
Abstract

Samples of ∼1,900 identified protons and ∼500 Λ have been used to search for decuplet baryon production ine+e− annihilation at a c.m. energy of 34.4 GeV. Thep π+ and Λ π± invariant mass spectra contain no Δ orΣ* signals. Upper limits, at 95% confidence level, are that less than 12% of allp and less than 26% of all Λ come from the decay of doubly charged Δ and singly chargedΣ* states respectively. These limits correspond to production rates of

Published
1984
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9. Differential cross sections for in the CM energy range from 2.0 to 3.1 GeV

Author

Georg Zobernig, Gy. Wolf, M. Wollstadt, H. Siebke, R. J. Cashmore, Ehud Duchovni, U. Kötz, T. R. Wyatt, D. A. Garbutt, T. Kracht, Ch. Xiao, E. Lohrmann, Joseph Izen, D. R. Quarrie, H. Kück, D. M. Binnie, D. Pandoulas, M. Dittmar, Tegid Jones, D. Heyland, P. Leu, R. Wedemeyer, R.C.E. Devenish, H. Venkataramania, Gl Salmon, L. Köpke, M. Cherney, T. Barklow, Juergen Thomas, J. Pyrlik, U. Karshon, E. Hilger, D.W. Schmitz, A. Shapira, G. Yekutieli, Hl Krasemann, A. Jocksch, D. Strom, H. Kowalski, H. G. Sander, P. J. Dornan, A. J. Campbell, W. Schütte, Fernando Barreiro, W. Koch, Norbert Wermes, G. Poelz, W. G. Jones, A. Ladage, I. Al-Agil, R. Fohrmann, A. Caldwell, Stephen Lloyd, K. H. Mess, M. Rushton, M. Mermikides, D. Revel, H. U. Martyn, R. Mir, G. Rudolph, B. Neumann, P. Rosskamp, P. L. Woodworth, M. G. Bowler, D. Lüke, K. W. Bell, P. Mättig, J. Rimkus, C. Youngman, D. Trines, Walter Dr. Hillen, G. Peise, I. C. Brock, P. E. L. Clarke, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, K. Lübelsmeyer, S. J. Cooper, Y. Eisenberg, W. Braunschweig, H. Hartmann, J. Proudfoot, M. Althoff, D. Notz, D. H. Saxon, J. McCardle, K. Gather, G. Mikenberg, R. Beuselinck, F. J. Kirschfink, E.E. Ronat, P. Grossmann, G. Knop, B. Löhr, P. Joos, M. Holder, B. Foster, H. Hultschig, B. H. Wiik, John Hart, E. Wicklund, Sau Lan Wu, J. Harvey, and H. M. Fischer

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Angular range, Range (particle radiation), Cross section (physics), Angular distribution, Scattering, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Storage ring
Abstract

Exclusive production of proton-antiproton pairs by two photon scattering at CM energies between 2.0 GeV and 3.1 GeV has been measured with the TASSO detector at the e + e − storage ring PETRA. The angular distribution is flat within the accepted CM angular range | cos Θ ∗ |⩽0.7 . The integrated cross section (| cos Θ ∗ |⩽0.6) drops from about 4 nb at 2 GeV to less than 0.5 nb above 3 GeV. For the two-photon production of the η c (2984) and its subsequent decay into proton-antiproton the upper limit Γ(η c →γγ)· B (η c → p p ) keV (95% CL) is found.

Published
1983
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10. Properties of charm jets produced in e+e− annihilation near 34 GeV

Author

Gl Salmon, M. Althoff, D. Notz, U. Karshon, R. J. Nowak, M. Wollstadt, T. D. Jones, D.W. Schmitz, W. Koch, P. Rosskamp, A. Ladage, G. Poelz, R. Wedemeyer, H. Hartmann, T. Kracht, T. Barklow, W. Braunschweig, H. Kück, H. U. Martyn, A. Shapira, P. Grossmann, H. Kowalski, Norbert Wermes, C. M. Hawkes, H. Venkataramania, R.C.E. Devenish, D. R. Quarrie, D. M. Binnie, R. Fohrmann, J. Proudfoot, P. L. Woodworth, U. Kötz, Gy. Wolf, Michael Dittmar, K. Gather, A. L. Campbell, G. Yekutieli, Rj Cashmore, E. Hilger, Giora Mikenberg, B. Neumann, W. G. Jones, W. A. T. Wan Abdullah, D. A. Garbutt, J. Thomas, J. Sedgbeer, F. J. Kirschfink, M. Holder, D. Lüke, P. E. L. Clarke, H. Hultschig, B. H. Wiik, John Hart, Sau Lan Wu, P. J. Dornan, C. Jenkins, D. Pandoulas, J. Rimkus, K. Lübelsmeyer, H. Siebke, E.E. Ronat, T. R. Wyatt, G. Knop, P. Leu, Ch. Xiao, R. Mir, G. E. Forden, W. Schütte, Fernando Barreiro, Y. Eisenberg, M. Mermikides, D. Revel, L. Köpke, M. Cherney, M. G. Bowler, H. G. Sander, A. Jocksch, C. Youngman, J. McCardle, A. Caldwell, Stephen Lloyd, Ehud Duchovni, D. Strom, M. Rushton, G. Rudolph, B. Löhr, Walter Dr. Hillen, G. Peise, H. M. Fischer, Georg Zobernig, D. K. Hasell, P. Mättig, Joseph Izen, P. Joos, B. Foster, E. Wicklund, D. Trines, W. Wallraff, Philip Bull, J. Harvey, R. Beuselinck, K. W. Bell, D. H. Saxon, J. Pyrlik, Hermann Kolanoski, Hl Krasemann, and E. Lohrmann

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Charged particle, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

D ∗± production via e + e − → D ∗± X was studied at CM energies near 34 GeV. The charged particles produced in the hemisphere opposite to that of the D ∗ were used to investigate the fragmentation of charm jets. All spectra studied show a close similarity between the charm jet and the average jet obtained by summing over all quark flavours. The spectra of particles produced in the D ∗ hemisphere were used to study separately first rank and higher rank fragmentation.

Published
1984
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11. Determination of α s in first and second order QCD frome + e − annihilation into hadrons

Author

E.E. Ronat, V. Mertens, G. Knop, D.W. Schmitz, H. Venkataramania, B. Neumann, P. J. Dornan, M. Holder, H. Hultschig, E. Hilger, B. H. Wiik, R. Mir, C. Youngman, R. Fohrmann, John Hart, Sau Lan Wu, W. Wallraff, Philip Bull, E. Lohrmann, C. Jenkins, Rj Cashmore, J. Harvey, R. Wedemeyer, Ehud Duchovni, G. E. Forden, G. Baranko, K. U. Pösnecker, D. Strom, A. Ladage, J. Eisenmann, D. Lüke, P. Rosskamp, W. Schütte, Fernando Barreiro, T. Barklow, T. D. Jones, U. Karshon, M. Takashima, R. J. Nowak, D. H. Saxon, M. Rushton, A. Eskreys, G. Rudolph, D. Pandoulas, H. U. Martyn, B. Löhr, F. J. Kirschfink, A. Shapira, P. Joos, U. Kötz, P. Grossmann, H. Siebke, D. A. Garbutt, E. Wicklund, M. G. Bowler, J. Pyrlik, J. McCardle, M. Winik, H. Kowalski, M. Mermikides, D. Revel, T. Kracht, Giora Mikenberg, P. Leu, D. K. Hasell, K. J. Sedgbeer, Hl Krasemann, P. Mättig, Hermann Kolanoski, R. Beuselinck, M. Althoff, D. Notz, L. Köpke, B. Foster, D. M. Binnie, M. Cherney, Gy. Wolf, Stephanie Brandt, A. Caldwell, J. Thomas, A. Jocksch, G. Yekutieli, K. W. Bell, H. G. Sander, Joseph Izen, Stephen Lloyd, Ch. Xiao, H. M. Fischer, H. Hartmann, G. Kreutz, D. Trines, Michael Dittmar, K. Gather, Georg Zobernig, H. Kück, Y. Eisenberg, W. Braunschweig, C. M. Hawkes, T. Tymieniecka, K. Lübelsmeyer, W. G. Jones, W. A. T. Wan Abdullah, P. E. L. Clarke, R.C.E. Devenish, and G. Poelz

Subjects
Quantum chromodynamics, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, media_common.quotation_subject, Hadron, Asymmetry, Spectral line, Gluon, Nuclear physics, Bibliography, High Energy Physics::Experiment, media_common
Abstract

Multihadron events produced bye+e− annihilation at a c.m. energy of 34.6 GeV have been used to determine αs. The predictions of 1 st and 2nd order QCD models with independent jet and string fragmentation have been compared to a large variety of kinematic variables such as event shapes, transverse momentum spectra, jet masses, 3-cluster thrust and the asymmetry of energy-energy correlations. The value of αs has been found to depend on the variables used, on the fragmentation model and on the treatment of soft gluons in the 2nd order QCD calculation. Within the models considered αs has been found in complete 2nd order QCD to lie between 0.12 and 0.23.

Published
1984
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12. Observation of production in e+e− anihilation

Author

W. G. Jones, Ehud Duchovni, H. Venkataramania, B. Löhr, C. Youngman, D. Trines, P. Joos, F. J. Kirschfink, B. Foster, P. L. Woodworth, J. Harvey, J. Pyrlik, E. Wicklund, Gl Salmon, E. Hilger, W. Schütte, Fernando Barreiro, W. Wallraff, C. Jenkins, I. C. Brock, M. G. Bowler, M. Holder, H. Hultschig, Hermann Kolanoski, J. K. Sedgbeer, D. Strom, Joseph Izen, D. Lüke, A. Jocksch, J. Rimkus, M. Rushton, B. H. Wiik, John Hart, A. Ladage, D. M. Binnie, Y. Eisenberg, D. R. Quarrie, M. Dittmar, W. Braunschweig, M. Althoff, D. Notz, H. M. Fischer, G. Rudolph, Sau Lan Wu, R. Wedemeyer, E. Lohrmann, P. Grossmann, Georg Zobernig, J. McCardle, K. Gather, D. Pandoulas, Ch. Xiao, M. Mermikides, D. Revel, G. Mikenberg, R. Beuselinck, P. Rosskamp, W. Koch, R. Mir, B. Neumann, R. J. Cashmore, Gy. Wolf, T. Barklow, Tegid Jones, G. Poelz, U. Kötz, M. Wollstadt, Norbert Wermes, P. Leu, G. Yekutieli, E.E. Ronat, A. Caldwell, Stephen Lloyd, R.C.E. Devenish, H. Siebke, D. A. Garbutt, K. H. Mess, T. R. Wyatt, G. Knop, H. Hartmann, K. W. Bell, P. Mättig, D.W. Schmitz, A. Shapira, P. J. Dornan, Hl Krasemann, A. J. Campbell, J. Proudfoot, T. Kracht, L. Köpke, R. Fohrmann, M. Cherney, Walter Dr. Hillen, G. Peise, H. G. Sander, U. Karshon, K. Lübelsmeyer, D. H. Saxon, D. Heyland, Juergen Thomas, H. Kowalski, W. A. T. Wan Abdullah, P. E. L. Clarke, H. Kück, and H. U. Martyn

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Electron–positron annihilation, Hadron, Event (particle physics)
Abstract

We present evidence for the production of Ξ· − , Ξ − in e+e− annihilation into hadrons. Our measurements yields: 0.026 ± 0.008 (stat.) ± 0.009 (syst.) Ξ − , Ξ − per hadronic event at W ∼ 34 GeV. Using our previous measurements of Λ, Λ and p, p production we obtain the relative yields (Ξ − , Ξ − /(Λ, Λ = 0.087 ± 0.03 ( stat. ) ± 0.03 ( syst. ) and (Ξ − , Ξ − /( p , p = 0.033 ± 0.011 ( stat. ) ± 0.011 ( syst. ) .

Published
1983
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13. A detailed study of strange particle production ine + e − annihilation at high energy

Author

G. Yekutieli, Ch. Xiao, Michael Dittmar, K. Gather, W. Wallraff, Philip Bull, Giora Mikenberg, W. Schütte, P. Dauncey, Stephanie Brandt, K. Lübelsmeyer, Y. Eisenberg, Ehud Duchovni, Fernando Barreiro, Hermann Kolanoski, J. K. Sedgbeer, J. Harvey, M. Althoff, E. Ronat, D. K. Hasell, W. Braunschweig, P. Mättig, J. McCardle, H. U. Martyn, D. Notz, V. Mertens, A. Eskreys, C. M. Hawkes, R. Wedemeyer, W. G. Jones, U. Kötz, Joseph Izen, H. M. Fischer, D. A. Garbutt, K. U. Pösnecker, D. H. Saxon, R. Beuselinck, P. L. Woodworth, Georg Zobernig, A. Ladage, D. M. Binnie, W. A. T. Wan Abdullah, A. Caldwell, G. Baranko, H. Hartmann, G. Knop, A. Shapira, Stephen Lloyd, G. Poelz, M. Mermikides, D. Revel, D. Strom, P. Grossmann, G. E. Forden, M. Rushton, R.C.E. Devenish, G. Rudolph, B. Löhr, Hl Krasemann, F. J. Kirschfink, K. W. Bell, U. Karshon, R. J. Nowak, M. Holder, M. Takashima, H. Hultschig, H. Venkataramania, B. H. Wiik, John Hart, E. Lohrmann, Sau Lan Wu, P. Leu, M. Cherney, J. Eisenmann, P. Joos, B. Foster, E. Wicklund, D. J. Mellor, J. Thomas, T. D. Jones, E. Hilger, R. Mir, H. Siebke, H. Kowalski, D. Pandoulas, D. Lüke, S. Ritz, C. Jenkins, B. Neumann, Rj Cashmore, J. Pyrlik, M. G. Bowler, D.W. Schmitz, C. Youngman, P. J. Dornan, A. J. Campbell, R. Fohrmann, P. Rosskamp, M. Hildebrandt, Gy. Wolf, A. Joksch, T. Kracht, H. Kück, P. E. L. Clarke, T. Tymieniecka, G. Kreutz, and D. Trines

Subjects
Baryon, Nuclear physics, Physics, Strange quark, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Rapidity, Lambda, Engineering (miscellaneous), Scaling, Charged particle
Abstract

Results onK0 and Λ production ine+e− annihilation at c.m. energies of 14, 22 and 34 GeV are presented. The shape of theK0 and Λ differential cross sections are very similar to each other and to those of π±,K± and\(p(\bar p)\). Scaling violations are observed forK0 production. We obtain a value for the probability to produce strange quark-antiquark pairs relative to that to produce up or down quark-antiquark pairs of 0.35±0.02±0.05. The value ofRh=σ(e+e-→hX)/σµµ is shown to rise steadily with c.m. energy for all particle species. At 34 GeV we find 1.48±0.05K0 and 0.31±0.03 Λ per event. We have searched for possible Λ polarization. The production ofK0's and Λ's in jets is examined as a function ofpT2 and rapidity and compared to that of all charged particles; the yields in two and three jets are also investigated. Results are presented from events with two baryons\((\Lambda ,\bar \Lambda ,por\bar p)\) observed.

Published
1985
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14. Observation of F meson production in high energy e+e− annihilation

Author

W. Schütte, D. K. Hasell, Fernando Barreiro, P. Mättig, Y. Eisenberg, M. Mermikides, D. Revel, Joseph Izen, C. Youngman, J. McCardle, Rj Cashmore, R. Mir, M. Holder, H. Hultschig, T. Barklow, H. M. Fischer, H. Kück, Georg Zobernig, B. H. Wiik, T. D. Jones, John Hart, V. Mertens, L. Köpke, H. Hartmann, M. Cherney, A. Jocksch, D. R. Quarrie, Sau Lan Wu, H. G. Sander, P. J. Dornan, H. Kowalski, G. Baranko, Ch. Xiao, W. Wallraff, Philip Bull, H. U. Martyn, J. Thomas, J. Harvey, J. Proudfoot, W. A. T. Wan Abdullah, D. M. Binnie, M. G. Bowler, R. Wedemeyer, D.W. Schmitz, D. H. Saxon, C. Jenkins, M. Althoff, D. Notz, Giora Mikenberg, E.E. Ronat, R. Beuselinck, M. Wollstadt, G. Knop, Gl Salmon, Walter Dr. Hillen, P. Grossmann, G. E. Forden, P. E. L. Clarke, G. Peise, P. Joos, U. Kötz, B. Foster, Hermann Kolanoski, W. Koch, T. Kracht, A. J. Campbell, D. A. Garbutt, W. G. Jones, E. Wicklund, A. Ladage, F. J. Kirschfink, G. Poelz, R. Fohrmann, D. Trines, K. W. Bell, R.C.E. Devenish, D. Strom, Gy. Wolf, M. Rushton, P. Leu, G. Rudolph, P. L. Woodworth, B. Löhr, Hl Krasemann, J. Rimkus, D. Lüke, H. Venkataramania, E. Hilger, P. Rosskamp, D. Pandoulas, J. Pyrlik, H. Siebke, T. R. Wyatt, J. Sedgbeer, Norbert Wermes, E. Lohrmann, A. Shapira, Michael Dittmar, K. Gather, G. Yekutieli, A. Caldwell, Stephen Lloyd, K. Lübelsmeyer, Ehud Duchovni, W. Braunschweig, C. M. Hawkes, U. Karshon, R. J. Nowak, and B. Neumann

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, High energy, Meson production, Pair production, Annihilation, Meson, Branching fraction, Electron–positron annihilation, Yield (chemistry)
Abstract

Production of the F meson by e + e − annihilation at high energies has been obsrved in the ϕπ final state with a mass of 1.975 ± 0.009 ± 0.010 GeV and a width consistent with the mass resolution. The yield of F production times branching ratio relative to μ pair production is R F ( x ⩾ 0.3) B (F ± → ϕπ ± ) = 0.061 ± 0.012 ± 0.018.

Published
1984
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15. PRODUCTION AND MUONIC DECAY OF HEAVY QUARKS IN E+E- ANNIHILATION AT 34.5 GEV

Author

H. Venkataramania, J. Pyrlik, E. Hilger, D. Trines, W. Koch, H. Kowalski, C. Youngman, G. Poelz, Hermann Kolanoski, J. K. Sedgbeer, W. A. T. Wan Abdullah, G. E. Forden, Walter Dr. Hillen, H. Hartmann, R. Mir, G. Peise, J. Proudfoot, A. L. Campbell, W. Jocksch, Michael Dittmar, G. Yekutieli, P. E. L. Clarke, R. Wedemeyer, T. Barklow, R.C.E. Devenish, K. W. Bell, P. Mättig, M. Althoff, D. Notz, B. Foster, D. M. Binnie, A. Shapira, M. Holder, Norbert Wermes, H. Hultschig, B. H. Wiik, John Hart, Sau Lan Wu, B. Löhr, P. Joos, E. Wicklund, K. Lübelsmeyer, Y. Eisenberg, W. Braunschweig, Hl Krasemann, C. M. Hawkes, Juergen Thomas, P. Leu, E. Lohrmann, D.W. Schmitz, D. Strom, P. J. Dornan, D. Pandoulas, H. Siebke, R. Fohrmann, H. U. Martyn, T. R. Wyatt, M. Rushton, G. Rudolph, W. Wallraff, Philip Bull, D. Lüke, L. Köpke, M. Cherney, U. Kötz, H. G. Sander, D. A. Garbutt, W. Schütte, R. J. Nowak, Fernando Barreiro, J. Harvey, J. Rimkus, M. Mermikides, D. Revel, Gy. Wolf, Ch. Xiao, P. Rosskamp, M. G. Bowler, C. Jenkins, Rj Cashmore, W. G. Jones, Ehud Duchovni, P. L. Woodworth, P. Grossmann, J. McCardle, K. Gather, T. D. Jones, R. Beuselinck, D. K. Hasell, D. Ronat, Gl Salmon, Joseph Izen, D. R. Quarrie, A. Ladage, F. J. Kirschfink, D. H. Saxon, A. Caldwell, U. Karshon, Stephen Lloyd, G. Knop, B. Neumann, H. M. Fischer, Georg Zobernig, Giora Mikenberg, H. Kück, M. Wollstadt, and T. Kracht

Subjects
Nuclear physics, Physics, Particle decay, Particle physics, Muon, Pair production, Annihilation, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Engineering (miscellaneous), Lepton
Abstract

The production of prompt muons in e+e- annihilation has been studied at centre of mass energies near 34.5 GeV. The measured semi-muonic branching ratios of b and c quarks are B(b»Xμv) =0.117±0.028±0.01 and B(c→Xμv)=0.082 ±0.012a-0.01+0.02. The fragmentation functions of heavy quarks are hard, =0.85a-0.12-0.07+0.10+0.02 and =0.77a-0.07-0.11+0.05+0.03. Limits have been set on flavour changing neutral current decays:B(b→Xμ+μ-)

Published
1984

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