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22 results on '"Mark J. Burchell"'

1. High statistics study of ƒ0(1500)s decay into ηη

Author

J. Kisiel, H. Stöck, C. A. Meyer, P. Schmidt, D. Walther, A. Noble, D. Urner, P. Illinger, K.M. Crowe, G. Pinter, C.A. Baker, W. Dünnweber, R. McCrady, H. Kalinowsky, Eberhard Klempt, T. Kiel, H. P. Dietz, O. Cramer, M. Herz, C. N. Pinder, F. Walter, S. v. Dombrowski, D. S. Armstrong, E. Schäfer, C.J. Batty, N. Djaoshvili, U. Strohbusch, J. Lüdemann, C. Straßburger, L. Montanet, M. Merkel, Mark J. Burchell, M. Suffert, R. Seibert, R. Bossingham, C. Felix, Michael Kobel, R. Landua, F. Ould-Saada, M. A. Faessler, R.P. Haddock, B.M. Barnett, K. Peters, P. Giarritta, H. Matthaey, C. Regenfus, M. Lakata, Herbert Koch, Pàl Hidas, B. Kämmle, J. Brose, P. Birien, A. Cooper, T. Degener, Č. Zuppančič, M. Tischäuser, U. Wiedner, Michael Doser, J. Zoll, S. Ravndal, B. S. Zou, T. Case, Nigel Hessey, U. Thoma, C. Holzhaussen, C. Völcker, Marcel Kunze, K. Beuchert, D. Jamnik, D. Engelhardt, M. Englert, F.H. Heinsius, B. Kalteyer, S. Spanier, C. Kolo, R. Hackmann, K. Braune, S. U. Chung, S. Resag, J. P. Merlo, R. Ouared, K. Königsmann, Claude Amsler, P. Blüm, and D.V. Bugg

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Quality (physics), Partial wave analysis, Scalar (mathematics), Statistics, Dalitz plot, Resonance
Abstract

A partial wave analysis of the reaction p p →π o ηη has been performed, using a high quality, high statistics data set of 198,000 events. In addition to the ƒ 0 (1370), a second scalar resonance decaying into ηη, the ƒ 0 (1500), with mass m = (1505 ± 15) MeV and width Γ = (120 ± 30) MeV has to be introduced to describe the data.

Published
1995

2. First observation of the production of nucleon resonances in antiproton annihilation in liquid deuterium

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Deuterium, Antiproton, Nucleon, Particle Physics - Experiment
Published
1995

3. η-decays into three pions

Author

J. Kisiel, W. Dünnweber, R. McCrady, C. Felix, Pàl Hidas, J. P. Merlo, P. Birien, K. Königsmann, K. Braune, Bernhard Schmid, K. Beuchert, N. Winter, D. Jamnik, D. Engelhardt, M. Suffert, R. Seibert, D. Urner, A. Cooper, J. Salk, H. Stöck, C.J. Batty, B. Kämmle, U. Thoma, Mark J. Burchell, F. H. Heinsius, C. Völcker, U. Wiedner, F. Ould-Saada, Claude Amsler, Michael Doser, P. Blüm, Herbert Koch, I. Augustin, M. A. Faessler, S. Ravndal, D.V. Bugg, R.P. Haddock, K. Peters, Marcel Kunze, D. Walther, C. Regenfus, R. Hackmann, T. Degener, M. Herz, G. Folger, Michael Kobel, U. Strohbusch, C. Straßburger, M. Lakata, C. A. Meyer, M. Englert, Č. Zupančič, J. Zoll, B. M. Barnett, J. Lüdemann, H. Kalinowsky, A. Noble, P. Illinger, O. Cramer, R. Landua, S. Spanier, E. Schäfer, T. Case, H. Matthäy, B.S. Zou, M. Tischhäuser, R. Bossingham, C.A. Baker, F. Walter, G. Pinter, Kenneth M. Crowe, J. Brose, L. Montanet, C. N. Pinder, S. v. Dombrowski, C. Kolo, D. S. Armstrong, M. Merkel, Eberhard Klempt, T. Kiel, H. P. Dietz, R. Glantz, Nigel Hessey, and P. Schmidt

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Crystallography, Chiral perturbation theory, Pion, Partial width, Mass spectrum, Dalitz plot
Abstract

The branching ratios Γ(η → 3π 0 ) Γ(η → π + π − π 0 ) = 1.44 ± 0.09 ± 0.10 and Γ(η → γγ) Γ(η → π + π − π 0 ) = 1.78 ± 0.10 ± 0.13 have been determined using the Crystal Barrel detector at LEAR. The latter ratio yields a partial width of Γ ( η → π + π − π 0 ) = 0.26 ± 0.03 keV using the known value for Γ ( η → γγ ). The η → π + π − π 0 ) Dalitz plot is compared to the predictions of chiral perturbation theory.

Published
1995

4. Observation of radiative annihilation into a Φ meson

Author

C.A. Baker, C. Felix, F. Walter, C. A. Meyer, U. Thoma, A. Cooper, H. Stöck, F. H. Heinsius, Kenneth M. Crowe, M. Englert, A. Noble, J. Brose, M. A. Faessler, K. Beuchert, R.P. Haddock, B. Kämmle, K. Braune, C. Kolo, T. Case, H. Matthäy, N. Winter, D. Jamnik, D. Engelhardt, G. Pinter, R. Landua, B. M. Barnett, P. Schmidt, H. Kalinowsky, Mark J. Burchell, S. Spanier, L. Montanet, M. Suffert, R. Seibert, W. Dünnweber, O. Cramer, Claude Amsler, R. McCrady, R. Bossingham, F. Ould-Saada, Herbert Koch, E. Schäfer, C. Regenfus, Č. Zupančič, P. Birien, C. Völcker, Pàl Hidas, Marcel Kunze, M. Tischhäuser, T. Degener, M. Herz, J. P. Merlo, B. S. Zou, P. Illinger, J. Kisiel, K. Königsmann, P. Blüm, D. Urner, D.V. Bugg, R. Hackmann, M. Lakata, J. Zoll, Michael Kobel, Eberhard Klempt, T. Kiel, H. P. Dietz, I. Augustin, C. N. Pinder, K. Peters, S. v. Dombrowski, D. S. Armstrong, M. Merkel, U. Wiedner, Michael Doser, C.J. Batty, S. Ravndal, D. Walther, U. Strohbusch, C. Straßburger, J. Lüdemann, and Nigel Hessey

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Meson, Antiproton, Branching fraction, Radiative transfer, Analytical chemistry
Abstract

The annihilation p p → Φγ has been investigated with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The observed branching ratio BR ( p p → Φγ = (1.7 ± 0.4) · 10 −5 is almost two orders of magnitude higher than expected from the OZI-rule. As a by-product, the branching ratios BR ( p p → K L K S ) = (9.0 ± 0.6) · 10 −4 and BR ( p p → Φπ 0 ) = (5.5 ± 0.7) · 10 −4 have been measured.

Published
1995

5. High-statistics study of f0(1500) decay into π0π0

Author

C. Völcker, H. Kalinowsky, L. Montanet, B. Kämmle, Marcel Kunze, C. Kolo, Nigel Hessey, J. Kisiel, O. Cramer, C.A. Baker, R. Hackmann, C. A. Meyer, P. Blüm, Claude Amsler, M. Lakata, F. Walter, E. Schäfer, M. Suffert, R. Seibert, U. Wiedner, F. H. Heinsius, T. Case, H. Matthäy, Kenneth M. Crowe, R. Landua, Michael Doser, K. Beuchert, F. Ould-Saada, J. P. Merlo, P. Schmidt, J. Zoll, S. Spanier, K. Königsmann, A. Noble, H. Stöck, M. A. Faessler, W. Dünnweber, Herbert Koch, N. Winter, G. Pinter, T. Degener, M. Herz, B.M. Barnett, U. Thoma, K. Braune, S. U. Chung, D. Jamnik, R. Bossingham, Č. Zupančič, F. Loser, Mark J. Burchell, D. Engelhardt, D. Urner, C. Regenfus, C. Felix, K. Peters, Michael Kobel, P. Birien, Pàl Hidas, R. P. Haddock, M. Englert, C. N. Pinder, S. v. Dombrowski, D. S. Armstrong, M. Merkel, D. Walther, U. Strohbusch, C. Straßburger, J. Lüdemann, J. Brose, C.J. Batty, I. Augustin, S. Ravndal, Eberhard Klempt, T. Kiel, H. P. Dietz, J. Salk, and P. Illinger

Subjects
Data set, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Partial wave analysis, Scalar (mathematics), Dalitz plot, Resonance (particle physics)
Abstract

A partial-wave analysis of the reaction p p →π 0 π 0 π 0 has been performed using a high-quality high-statistics data set of 712 000 events. In addition to the f0(975) and f0(1300), the scalar resonance with mass m = (1500 ± 15) MeV and width Γ = (120 ± 25) MeV is necessary to describe the data.

Published
1995

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

Author

R. Bossingham, M. Suffert, R. Seibert, C. N. Pinder, S. v. Dombrowski, D. S. Armstrong, F. Loser, Claude Amsler, U. Wiedner, M. Merkel, C.A. Baker, Michael Doser, F. H. Heinsius, I. Augustin, P. Schmidt, W. Dünnweber, J. P. Merlo, K. Peters, K. Königsmann, R. Hackmann, A. Cooper, C.J. Batty, F. Walter, Herbert Koch, Michael Kobel, P. Blüm, D.V. Bugg, M. Lakata, H. Kalinowsky, R. P. Haddock, Kenneth M. Crowe, B. M. Barnett, B. S. Zou, O. Cramer, M. A. Faessler, E. Schäfer, Eberhard Klempt, S. Ravndal, Mark J. Burchell, M. Englert, T. Kiel, H. P. Dietz, D. Walther, R. Landua, C. A. Meyer, C. Kolo, U. Strohbusch, Pàl Hidas, L. Montanet, B. Kämmle, Nigel Hessey, K. Beuchert, A. Noble, J. Lüdemann, N. Winter, P. Illinger, D. Jamnik, D. Engelhardt, J. Salk, J. Brose, K. Braune, S. U. Chung, T. Case, H. Matthäy, P. Birien, S. Spanier, C. Straβburger, G. Pinter, C. Völcker, Marcel Kunze, Č. Zupančič, D. Urner, C. Felix, J. Kisiel, F. Ould-Saada, T. Degener, M. Herz, and J. Zoll

Subjects
Physics, Rest (physics), Nuclear and High Energy Physics, Particle physics, Dalitz plot
Abstract

We report on the observation of an ηη′ threshold enhancement produced in pp annihilations at rest into π0ηη′, which we identify with the recently discovered ƒ 0 (1500) .

Published
1994

7. Observation of a new IG(JPC)=1−(0++) resonance at 1450 MeV

Author

P. Schmidt, W. Dünnweber, C. Felix, U. Wiedner, Michael Doser, B. S. Zou, Eberhard Klempt, D. Urner, C. Kolo, L. Montanet, B. Kämmle, F. Loser, I. Augustin, T. Kiel, H. P. Dietz, C.J. Batty, Pàl Hidas, K. Peters, J. P. Merlo, R. Hackmann, J. Kisiel, C.A. Baker, A. V. Sarantsev, F. H. Heinsius, S. Ravndal, Herbert Koch, V. V. Anisovich, M. Suffert, D. Walther, J. Zoll, F. Walter, U. Strohbusch, G. Pinter, K. Königsman, Mark J. Burchell, Kenneth M. Crowe, Michael Kobel, J. Lüdemann, A. Cooper, J. Brose, S. von Dombrowski, B. M. Barnett, F. Ould-Saada, C. A. Meyer, Č. Zupančič, S. Spanier, P. Blüm, H. Kalinowsky, C. N. Pinder, A. Noble, R. Landua, D. S. Armstrong, T. Degener, M. Herz, D.V. Bugg, M. Merkel, P. Illinger, E. Schäfer, J. Salk, Nigel Hessey, C. Völcker, Marcel Kunze, C. Straβburger, R. Bossingham, Claude Amsler, K. Braune, S. U. Chung, M. A. Faessler, T. Case, H. Matthäy, M. Englert, P. Birien, R. P. Haddock, K. Beuchert, N. Winter, D. Jamnik, and D. Engelhardt

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Partial wave analysis, Resonance, Dalitz plot, Elementary particle, Quantum number
Abstract

A new IG=1− JPC=0++πη resonance is observed in pp annihilation at rest into π0π0η. It has a mass M=(1450±40)MeV and a width Γ=(270±40)MeV.

Published
1994

8. Search for a new light gauge boson in decays of π0 and η

Author

F. H. Heinsius, A. Cooper, G. Pinter, Č. Zupančič, B. S. Zou, L. Montanet, S. von Dombrowski, D. Urner, C. Felix, M. Suffert, Pàl Hidas, T. Case, B. Kämmle, H. Matthäy, Z. Jávorfi, P. Blüm, F. Ould-Saada, Claude Amsler, D.V. Bugg, J. Salk, R. Hackmann, T. Degener, C. A. Mever, D. Walther, R. Bossingham, J. Kisiel, Mark J. Burchell, N. Winter, U. Strohbusch, P. Birien, C. Kolo, J. Lüdemann, Michael Kobel, K. Beuchert, C.J. Batty, D. Jamnik, D. Engelhardt, B. M. Barnett, S. Ravndal, C.A. Baker, K. Braune, H. Kalinowsky, F. Walter, J. P. Merlo, M. Englert, K. Königsmann, R. Landua, Kenneth M. Crowe, E. Schäfer, J. Brose, Eberhard Klempt, T. Kiel, H. P. Dietz, C. N. Pinder, D. S. Armstrong, A. Noble, M. Merkel, J. Zoll, Herbert Koch, P. Illinger, I. Augustin, P. Schmidt, K. Peters, W. Dünnweber, A. H. Sanjari, M. A. Faessler, R.P. Haddock, Bernhard Schmid, F. Loser, U. Wiedner, Michael Doser, C. Völcker, Marcel Kunze, C. Straβburger, S. Spanier, N. P. Hessey, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and CRYSTAL BARREL

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Gauge boson, Particle physics, Photon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Branching fraction, Elementary particle, 01 natural sciences, Upper and lower bounds, Nuclear physics, Particle decay, Photon emission, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Particle Physics - Experiment
Abstract

We have searched for new light gauge bosons produced in π 0 and η decays by studying the kinematically well-constrained reactions p p→π 0 π 0 π 0 and p p→π 0 π 0 η , where one π 0 or the η decays through the emission of a single photon recoiling against a missing state X (where X is a long-lived weakly interacting particle or X →ν ν ). No signal has been observed and branching ratio upper limits of 6 × 10 −5 at 90% C.L. have been obtained for masses of the gauge boson lying between ∼65 MeV and 125 MeV ( π 0 decay), and 6 × 10 −5 at 90% C.L. for X masses between ∼200 MeV and 525 MeV (η decay). The π 0 -decay limit represents a factor of 4 to 8 improvement when compared to the existing limit, whereas the η decay limit has been measured for the first time, thereby extending the m x range from 130 MeV up to 525 MeV.

Published
1994

9. Observation of two JPC=0++ isoscalar resonances at 1365 and 1520 MeV

Author

Nigel Hessey, P. Blüm, C.A. Baker, A. V. Sarantsev, G. Folger, D.V. Bugg, R. Landua, K.M. Crowe, Michael Kobel, B. S. Zou, Eberhard Klempt, H. P. Dietz, G. Pinter, Pàl Hidas, P. Schmidt, F. Walter, J. Lüdemann, H. Koch, W. Dünnweber, J. P. Merlo, K. Königsmann, Krisztian Peters, B. M. Barnett, P. Illinger, M. Suffert, H. Kalinowsky, H. Matthäy, R. Bossingham, U. Wiedner, S. Spanier, U. Strohbusch, A. Noble, A. Cooper, J. Brose, J. Kisiel, Mark J. Burchell, E. Schäfer, Michael Doser, V. V. Anisovich, C. Kolo, L. Montanet, B. Kämmle, C. N. Pinder, T. Kiel, I. Augustin, K. Braune, D. Walther, D. S. Armstrong, Z. Jávorfi, C.J. Batty, C. Felix, C. Straßburger, M. Merkel, B. Schmid, M. A. Faessler, S. Ravndal, T. Degener, J. Salk, F. H. Heinsius, C. Völcker, A. H. Sanjari, J. Zoll, Marcel Kunze, T. Case, R. Hackmann, P. Birien, K. Beuchert, C. A. Meyer, N. Winter, D. Jamnik, D. Engelhardt, M. Englert, and R. P. Haddock

Subjects
Nuclear physics, Elastic scattering, Physics, Nuclear and High Energy Physics, Amplitude, Isoscalar, Resonance, Dalitz plot, Particle Data Group
Abstract

From a simultaneous analysis of data on pp → π0π0π0 and pp → ηηπ0 at rest, two I = 0, JPC = 0++ resonances are identified above 1 GeV. The first has mass M = 1365−55+20 MeV and width г = 268 ± 70 MeV, close to the ƒ0(1400) of the Particle Data Group. The second has M = 1520 ± 25 MeV, г = 148−25+20 MeV.

Published
1994

10. Protonium annihilation into KL0KL0π0 and KL0KS0η

Author

F. H. Heinsius, C. Völcker, Nigel Hessey, J. P. Merlo, R. Bossingham, C. N. Pinder, K. Königsmann, Pàl Hidas, Marcel Kunze, M. Suffert, P. Illinger, K. Braune, R. Hackmann, K. Beuchert, D. S. Armstrong, L. Montanet, N. Winter, T. Kiel, B. Kämmle, D. Jamnik, D. Engelhardt, C. Felix, D. Urner, H. Kalinowsky, M. Merkel, D. Walther, A. Cooper, S. von Dombrowski, P. Birien, C.A. Baker, M. Englert, E. Schäfer, S. Spanier, Eberhard Klempt, H. P. Dietz, F. Walter, P. Blüm, R. Glantz, Kenneth M. Crowe, Č. Zupančič, D.V. Bugg, Claude Amsler, J. Kisiel, U. Strohbusch, T. Case, H. Matthäy, G. Folger, Herbert Koch, Michael Kobel, C. Kolo, J. Brose, Z. Jávorfi, J. Lüdemann, F. Ould-Saada, C. Straßburger, A. H. Sanjari, J. Zoll, B. M. Barnett, T. Degener, G. Pinter, R. Landua, I. Augustin, K. Peters, C.J. Batty, C. A. Meyer, S. Ravndal, A. Noble, U. Wiedner, J. Salk, Michael Doser, Mark J. Burchell, B. S. Zou, M. A. Faessler, R.P. Haddock, P. Schmidt, W. Dünnweber, and Bernhard Schmid

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Amplitude, 010308 nuclear & particles physics, Protonium, 0103 physical sciences, Resonance, Elementary particle, 010306 general physics, 01 natural sciences
Abstract

The annihilation of pp at rest into KL0KS0π0 and KL0KS0η was investigated with the Crystal Barrel detector at LEAR. These final states with negative C-parity are dominated by φ and K0∗ resonances. The ratios of the branching ratios are B(pp→φπ0)B(pp→φη)=8.3±2.1 and B(pp→K0K0∗+K0K0∗→KL0KS0π0)B(pp→φπ0→KL0KS0π0)= 2.04±0.21.

Published
1993

11. Antiproton-proton annihilation at rest into ωπ0π0

Author

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

Subjects
Rest (physics), Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Proton, Antiproton
Published
1993

12. Radiative protonium annihilation into γγ, γπ0, γη, γω and γη′

Author

B. M. Barnett, R. Landua, L. Montanet, A. Cooper, M. Suffert, H. Kalinowsky, T. Case, J. Kisiel, J. Brose, H. Bossy, E. Schäfer, P. Blüm, Nigel Hessey, B. Kämmle, C. Kolo, S. v. Dombrowski, D. S. Armstrong, Z. Jávorfi, G. Pinter, M. Merkel, D.V. Bugg, F. Ould-Saada, C. Straßburger, P. Birien, C.A. Baker, Eberhard Klempt, H. P. Dietz, Claude Amsler, J. P. Merlo, S. Spanier, K. Königsmann, F. Walter, D. Urner, T. Kiel, P. Illinger, D. Walther, Kenneth M. Crowe, R. Bossingham, F. H. Heinsius, U. Strohbusch, C. Völcker, Herbert Koch, G. Folger, Marcel Kunze, Michael Kobel, Č. Zupančič, C. Felix, J. Lüdemann, K. Braune, S. U. Chung, C. A. Meyer, S. Waßmer, A. Noble, U. Wiedner, Michael Doser, I. Augustin, K. Peters, C.J. Batty, S. Ravndal, A. H. Sanjari, J. Zoll, James A. Bistirlich, P. Schmidt, W. Dünnweber, M. A. Faessler, R.P. Haddock, H. Matthaey, Bernhard Schmid, M. Englert, J. Salk, K. Beuchert, R. Hackmann, N. Winter, D. Jamnik, D. Engelhardt, Pàl Hidas, and Mark J. Burchell

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, Antiproton, Branching fraction, 0103 physical sciences, Radiative transfer, 010306 general physics, 01 natural sciences
Abstract

Radiative p p annihilation at rest into γγ , γπ 0 , γη , γω and γη′ has been measured with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The branching ratios are B γπ 0 =(44±4)×10 −6 , B γη =(9.3±1.4)×10 −6 and B γω =(68±18)×10 −6 , respectively. For B γγ and B γη ′ we find new upper limits of 0.63×10 −6 and 12×10 −6 (95% CL), respectively.

Published
1993

13. P- versus S-wave at rest in LH2

Author

C. Felix, A. Cooper, F. H. Heinsius, Herbert Koch, M. Suffert, C. Völcker, A. H. Sanjari, Marcel Kunze, D. Urner, Pàl Hidas, Č. Zupančič, G. Folger, Michael Kobel, H. Kalinowsky, C. A. Meyer, Bernhard Schmid, D. Walther, J. Zoll, Eberhard Klempt, Nigel Hessey, James A. Bistirlich, J. Brose, H. P. Dietz, J. Kisiel, S. Spanier, A. Noble, R. Landua, T. Kiel, U. Meyer-Berkhout, E. Schäfer, H. Bossy, G. Pinter, M. Englert, C. Straβburger, L. Montanet, B. Kämmle, U. Strohbusch, H. Matthaey, S. von Dombrowski, P. Schmidt, W. Dünnweber, M. Merkel, P. Illinger, K. Braune, J. Lüdemann, C.J. Batty, Mark J. Burchell, S. Ravndal, Claude Amsler, J. P. Merlo, K. Königsmann, K. Beuchert, N. Winter, R. Hackmann, D. Jamnik, P. Blüm, D. Engelhardt, D.V. Bugg, I. Augustin, K. Peters, R. P. Haddock, U. Wiedner, Michael Doser, C.A. Baker, M. A. Faessler, F. Walter, R. Bossingham, Kenneth M. Crowe, P. Birien, T. Case, B. M. Barnett, and C. Kolo

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Annihilation, Antiproton, Branching fraction, S-wave, Atom, Atomic physics
Abstract

The annihilation p p →π 0 π 0 was measured for antiprotons stopped in liquid hydrogen (LH2). This reaction is only allowed from odd angular momentum states of the p p - atom . The resulting branching ratio BR ( p p →π 0 π 0 ) LH 2 =(6.93±0.22 stat ±0.37 syst )×10 −4 , combined with a previous measurement of the branching ratio BR ( p p →π + π − ) 2 P in gas from the 2P-state of p p suggests a fraction of P-wave annihilation in LH2 of (28.8±3.5)%, much larger than the values obtained from other annihilation channels. A method of reconciling the contradictory results is discussed.

Published
1992

14. The pseudoscalar mixing angle ΘPS from ν and ν′ production in annihiltion at rest

Author

B. Kämmle, Č. Zupančič, M. Englert, S. v. Dombrowski, Bernhard Schmid, P. Blüm, G. Pinter, M. Suffert, U. Meyer-Berkhout, M. Merkel, D.V. Bugg, R. Landau, B. M. Barnett, C. Felix, P. Hidas, C. Kolo, C.J. Batty, L. Montanet, R. Hackmann, Nigel Hessey, J. Kisiel, Eberhard Klempt, T. Kiel, C. A. Meyer, H. P. Dietz, K. Beuchert, R. Bossingham, C.A. Baker, N. Winter, H. Bossy, U. Wiedner, D. Jamnik, D. Engelhardt, F. H. Heinsius, P. Illinger, J. P. Merlo, A. Noble, Michael Doser, A. H. Sanjari, A. Cooper, C. Völcker, C. Straβburger, K. Königsmann, J. Zoll, Herbert Koch, James A. Bistirlich, Kenneth M. Crowe, S. Ravndal, Marcel Kunze, D. Walther, M. A. Faessler, S. Spanier, R.P. Haddock, I. Augustin, H. Matthaey, P. Schmidt, K. Peters, U. Strohbusch, W. Dünnweber, J. Lüdemann, P. Birien, D. Urner, T. Case, Claude Amsler, K. Braune, S. U. Chung, H. Kalinowsky, E. Schäfer, G. Folger, Michael Kobel, and Mark J. Burchell

Subjects
Physics, Pseudoscalar, Rest (physics), Nuclear and High Energy Physics, Particle physics, Branching fraction, Mixing (physics)
Abstract

We have determined ratios of branching ratios for p p annihilations at rest into π0η and π0η′, into ηη and ηη′, and into ωη and ωη′. All reactins are observed in two different all-neutral final states. The ratios permit a determination of the pseudoscalar mixing angle. We find ΘPS = −(17.3±1.8)°.

Published
1992

15. Proton-antiproton annihilation into ηηπ-observation of a scalar resonance decaying into ηη

Author

Herbert Koch, C. Felix, U. Meyer-Berkhout, Z. Jávorfi, G. Pinter, C. A. Meyer, A. Noble, R. Hackmann, T. Kiel, S. Spanier, L. Montanet, B. Kämmle, C.A. Baker, S. von Dombrowski, B. M. Barnett, R. P. Haddock, Č. Zupančič, U. Wiedner, Kenneth M. Crowe, K. Beuchert, R. Landua, Michael Doser, H. Matthaey, N. Winter, F. H. Heinsius, P. Schmidt, C. Völcker, C. Kolo, D. Jamnik, D. Engelhardt, H. Bossy, C. J. Batty, Marcel Kunze, W. Dünnweber, A. H. Sanjari, S. Ravndal, M. Englert, Eberhard Klempt, H. P. Dietz, J. P. Merlo, I. Augustin, K. Königsmann, R. Bossingham, P. Blüm, D. Walther, B. Schmid, U. Strohbusch, D.V. Bugg, A. Cooper, P. Illinger, J. Lüdemann, D. Urner, T. Case, C. Straβburger, James A. Bistirlich, K. Braune, J. Zoll, M. Merkel, Nigel Hessey, Mark J. Burchell, Pàl Hidas, C. Amsler, P. Birien, M. A. Faessler, M. Suffert, K. Peters, G. Folger, H. Kalinowsky, R. Beckmann, and E. Schäfer

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Proton, 010308 nuclear & particles physics, Isoscalar, Nuclear Theory, Scalar (mathematics), Dalitz plot, 01 natural sciences, Resonance (particle physics), Nuclear physics, Antiproton, 0103 physical sciences, Mass spectrum, 010306 general physics
Abstract

The results of a measurement of pp annihilation at rest into ηηπ 0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar J PC =0 ++ resonance decaying into ηη is observed with a mass of 1560±25 MeV/ c 2 and a width of 245±50 MeV/ c 2 .

Published
1992

16. 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

17. Measurement of the inclusive decay properties of charmed mesons

Author

C. Grab, D. G. Hitlin, W. J. Wisniewski, Mark J. Burchell, T. H. Burnett, Jeffrey Richman, A. Seiden, P. M. Mockett, S. Weseler, Rafe Schindler, J. S. Brown, U. Mallik, Hartmut Sadrozinski, R. E. Cassell, L. Parrish, A. J. Weinstein, R. Mir, William S. Lockman, C. Simopoulos, Meng Wang, D. Coffman, F. DeJongh, V. Cook, D. E. Dorfan, T. Freese, P. C. Kim, Joseph Izen, R. Partridge, T. Schalk, I. E. Stockdale, G. Eigen, C. A. Heusch, C. G. Matthews, H. J. Willutzki, J. Drinkard, B. Tripsas, S. Dado, K. O. Bunnell, Y. Zhu, D. Wisinski, R. Xu, A. Mincer, W. Toki, Z. Bai, B. I. Eisenstein, J. F. Labs, D. Pitman, M. Scarlatella, B. Nemati, G. P. Dubois, D. H. Coward, T. Bolton, A. Li, T. E. Browder, A.C. Odian, C. Gatto, G. E. Gladding, S. Wasserbaech, and F. Villa

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Multiplicity (chemistry), Strangeness, Nuclear Experiment, Storage ring
Abstract

We report a high statistics study of the inclusive decay properties of the charmed D0 and D+ mesons, and the first inclusive study of the charmed Ds+. The data are collected at s =3.77 GeV and s =4.14 GeV with the Mark III detector at the e+e− storage ring SPEAR. For each charmed meson species, the charged-particle multiplicity, the strangeness content of the final state, and the average π0 multiplicity are determined.

Published
1991

18. Results concerning the decay Ds±→η′π±

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Elementary particle, 01 natural sciences, Particle decay, Crystallography, Pair production, Nuclear magnetic resonance, Pion, 0103 physical sciences, Mass spectrum, 010306 general physics
Abstract

A search for the decay D s + →η′π + ;η′→ϱγ has been performed by the NA14/2 photoproduction experiment at CERN. A signal compatible with the D s + has been observed, leading to a ratio of branching fractions of Br ( D s + →η′π + ) Br ( D s + →φπ + )=2.5±1.0 -0.4 +1.5 . A value of Br ( D + →η′π + ) Br ( D + → K − π + π + ) is set at 90% CL.

Published
1991

19. 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

20. 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

21. Measurement of the D∗ branching ratios

Author

W. Stockhausen, I. E. Stockdale, D.H. Coward, A. L. Duncan, Cg Matthews, K. O. Bunnell, Y. Zhu, D. Wisinski, A. Li, J. C. Brient, C. A. Heusch, L. Parrish, D. G. Hitlin, M. Scarlatella, G. E. Gladding, Mark J. Burchell, J. J. Thaler, Jay Hauser, Hartmut Sadrozinski, R. Mir, Christoph Grab, V. Cook, Norbert Wermes, A. L. Spadafora, U. Mallik, T. Schalk, A. J.R. Weinstein, W. H. Toki, W. J. Wisniewski, F. Villa, R. Xu, C. Gatto, S. A. Plaetzer, J. Adler, D.E. Dorfan, Kevin Einsweiler, A. Seiden, T. Bolton, J. Perrier, T. Freese, W. S. Lockman, A.C. Odian, C. Simopoulos, G. Blaylock, D. Coffman, J. S. Brown, R. Partridge, Steven Wasserbaech, B. Nemati, G. P. Dubois, G. Eigen, H. J. Willutzki, J. Drinkard, D. Pitman, J. D. Richman, T. H. Burnett, L. Köpke, A. Wattenberg, P. C. Kim, P. M. Mockett, R. E. Cassell, B. Tripsas, B. I. Eisenstein, Joseph Izen, J. J. Becker, R. P. Hamilton, R. H. Schindler, and R. F. Mozley

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Particle physics, Pion, Pair production, Meson, Branching fraction, Electron–positron annihilation, Hadron, Mass spectrum
Abstract

We report a new measurement of the D∗ branching ratios, using data obtained with the Mark III detector at the e^+e^− storage ring SPEAR at s=4.14GeV. A fit to the recoil mass squared spectrum of D mesons reconstructed through the decay modes K^−π^+π^+ and K^−π^+ is used to extract the D^(∗+) → γD^+, π^0D^+, π^+D^0 and D^(∗0) → γD^0, π^0D^0 branching ratios.

Published
1988

22. High energy photoproduction of large transverse-momentum π0 mesons: A quantitative test of QCD

Author

B. Dalmagne, J. Six, A. Duane, Daniel Treille, Tejinder Virdee, J. M. Brunet, P. Borgeaud, G. Tristram, P. Dello Russo, J.G. McEwen, B. Lefievre, Kaori Maeshima, Y. Zolnierowski, A. Ferrer, S. Costa Ramos, M. Schaeffer, Daniel Bloch, F. Richard, A. Volte, H. Burmeister, M. David, P. Roudeau, Mark J. Burchell, E. Augé, E. C. Katsoufis, J. L. Guyonnet, P. Noon, J.B.M. Pattison, Christopher Seez, G. Wormser, S. Orenstein, J.-P. Wuthrick, D. Websdale, A. Rougé, B. Bouquet, P. Petroff, A. de Bellefon, R. Legendre, J. P. Engel, A. de Lesquen, G. Villet, Y. Lemoigne, T. A. Filippas, E. Fokitis, R. Barate, P. Bonamy, P. Gregory, J. Kent, Th D. Papadopoulou, J. Engelen, T. Hofmokl, H. Shoostari, G. de Bouard, and I. Siotis

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Hadron, Compton scattering, Elementary particle, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Boson
Abstract

The first results on inclusive photoproduction of π 0 at transverse momenta up to 4 GeV/ c , using incident γ energies between 50 and 150 GeV are presented. A comparison is made with inclusive π 0 production obtained, in the same experiment, with incident π − . Using the π − data to parametrize the hadronic behaviour of the photon, significant differences are observed in quantitative agreement with QCD Compton scattering and corrections thereof.

Published
1986

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