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4 results on '"D.M. Websdale"'

1. D correlations in photoproduction

Author

J. P. Engel, D.M. Websdale, Y. Giomataris, M. P. Alvarez, A. Duane, E. C. Katsoufis, G. Tristram, J.M. Brunet, P. Borgeaud, Mark J. Burchell, R. W. Forty, M. David, A. Maltezos, J.M. Crespo, R. Strub, P. Bonamy, Th. D. Papadopoulou, H. Rahmani, P. Roudeau, T. A. Filippas, G. Villet, C. Krafft, J.G. McEwen, D. Treille, E. Fokitis, J. Dixon, B. d'Almagne, A. Ferrer, T. Hofmokl, P. Druet, W. K. Lui, D. Poutot, M. Primout, G. Wormser, A. Volte, P. Foucault, Mitchell Wayne, Y. Zolnierowski, P. Triscos, Michael Koratzinos, A. M. Lopez, B. Lefievre, C. Magneville, C. Seez, L. Di Ciaccio, D. Bloch, F. Calviño, J. Six, J. P. Gerber, R. Barate, Y. Lemoigne, H. Burmeister, B. Pattison, E. N. Gazis, and M. Cattaneo

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Hadron, Parton, Elementary particle, Nuclear physics, Particle decay, Pair production, Pion, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment
Abstract

Kinematic correlations between the charmed D and D mesons produced by a photon beam of mean energy 100 GeVc have been measured by the NA142 experiment at CERN using a sample of almost background-free fully reconstructed DD events. The observed D and DD distributions are compared to the predictions of production models using different parameters for the charm fragmentation function and for the intrinsic transverse momentum of the partons.

Published
1992

2. Photoproduction of the Λc charmed baryon

Author

W. K. Lui, E. C. Katsoufis, D. Poutot, Mark J. Burchell, T. Hofmokl, J. Six, J. P. Engel, G. Wormser, D.M. Websdale, P. Roudeau, A. Maltezos, Y. Lemoigne, R. Barate, Y. Giomataris, A. Ferrer, P. Foucault, Daniel Bloch, M. David, J. P. Gerber, A. Lopez, R. Strub, A. Volte, P. Bonamy, M. Primout, A. Duane, Y. Zolnierowski, C. Magneville, H. Rahmani, M. Wayne, M. Cattaneo, H. Burmeister, E. Fokitis, L. DiCiaccio, P. Borgeaud, C. Seez, M. Koratzinos, Th. D. Papadopoulou, G. Villet, J.G. McEwen, J. Dixon, J.M. Brunet, P. Druet, M. P. Alvarez, B. Pattison, E. N. Gazis, G. Tristram, J. M. Crespo, R. W. Forty, C. Krafft, B. Lefievre, P. Triscos, T. A. Filippas, D. Treille, B. D'Almagne, and F. Calviño

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Photon energy, Lambda baryon, 7. Clean energy, 01 natural sciences, Hadronization, Nuclear physics, Baryon, Charmed baryons, Pion, 0103 physical sciences, 010306 general physics, Nucleon
Abstract

In a photoproduction experiment using a mean photon energy of 100 GeV we have observed 29±8 Λ c ( Λ c ) charmed-baryon and antibaryon decays in the pK − π + ( p K + π − ) final state. Quasi two-body final states do not contribite significantly to this channel. The mass of the Λc was measured to be 2281.7±2.7±2.6 MeV/c2 and its lifetime 0.18±0.03±0.03 ps. The ratio of Λ c D production, measured in this experiment, is significantly greater than that predicted by photon-gluon fusion and using a Lund model to describe the hadronization. This excess cannot be completely accounted for in this model, even using a Λc branching fraction in pKπ as high as 5%.

Published
1990

3. Measurement of Ds± and Cabibbo-suppressed D± decays

Author

B. Dalmagne, Y. Zolnierowski, J. M. Crespo, R. W. Forty, D. Poutot, M. Wayne, R. Barate, C. Krafft, P. Borgeaud, E. C. Katsoufis, R. Strub, P. Roudeau, Mark J. Burchell, W. K. Lui, C. Magneville, M. P. Alvarez, B. Pattison, M. Koratzinos, E. N. Gazis, G. Tristram, A. Volte, J. P. Gerber, A. Lopez, Th. D. Papadopoulou, F. Calviño, B. Lefievre, A. Maltezos, A. Duane, J. Six, E. Fokitis, G. Wormser, P. Foucault, P. Bonamy, C. Seez, G. Villet, T. Hofmokl, M. Primout, Y. Lemoigne, J.G. McEwen, D.M. Websdale, Y. Giomataris, H. Rahmani, L. DiCiaccio, J.M. Brunet, M. David, T. A. Filippas, D. Treille, P. Druet, J. P. Engel, P. Triscos, A. Ferrer, H. Burmeister, Daniel Bloch, M. Cattaneo, and J. Dixon

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Quarkonium, 01 natural sciences, 3. Good health, Nuclear physics, Particle decay, Pion, Pair production, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

The CERN charm photoproduction experiment NA14/2 has studied the K + K − π + , φπ + , φπ + π 0 , and φπ + π + π − decay modes of the D s + and D + charmed mesons, and the corresponding charge conjugate states. We measure branching ratios: Br ( D + →φπ + ) Br ( D + → K − π + π + ) =0.098±0.032±0.014, Br ( D s + → K ∗0 K + ) Br ( D s + →φπ + ) =0.85±0.34±0.20 , and obtain upper for the other channels. Contrary to the prediction of some theoretical models, we do noy observe any decay of D s into φρ. Using the Lund Monte Carlo to hadronize the final-state partons we derive a value for the absolute branching fraction Br(D s + → φπ + ) =4.8±1.9%.

Published
1990

4. HIGH-RESOLUTION TRACKING WITH SCINTILLATING FIBERS

Author

J.B. Kinson, P. Hughes, O. Villalobos-Baillie, Chiara Roda, Jean-Paul Fabre, V. Flaminio, A. Duane, E. Lamanna, M.F. Votruba, G. Martellotti, J.G. McEwen, I. J. Bloodworth, Corrado Angelini, H. Leutz, K. Harrison, C. Fisher, J. N. Carney, D. R. O. Morrison, Gianni Penso, M. De Vincenzi, E. Quercigh, W. Beusch, A. Sciubba, D.M. Websdale, D. Crennell, A. Frenkel, and S. Petrera

Subjects
Physics, Nuclear and High Energy Physics, Optical glass, Large Hadron Collider, Physics::Instrumentation and Detectors, business.industry, Detector, High resolution, Tracking (particle physics), Super Proton Synchrotron, Optics, Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, business, Instrumentation
Abstract

A progress report is presented on the development of a high-resolution tracking detector based on scintillating optical glass fibres. It is planned to use this technique in the WA84 experiment∗ at the CERN Super Proton Synchrotron for the study of heavy-flavour production and decay.

Published
1989

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