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16 results on '"R. P. Haddock"'

1. Study of antiproton annihilation on neutrons into ωπ−π0

Author

M. Suffert, T. Case, H. Kalinowsky, V. Crede, K.M. Crowe, F. Meyer-Wildhagen, R. Landua, C. Regenfus, D. Jamnik, D. Engelhardt, R. Ouared, U. Kurilla, S. Wallis-Plachner, R. P. Haddock, N.P. Hessey, C.A. Baker, C.J. Batty, P. Blüm, K. Peters, Eberhard Klempt, M. A. Faessler, C. A. Meyer, A. V. Sarantsev, M. Benayoun, J. Kisiel, U. Wiedner, Bruce Barnett, D. Walther, U. Thoma, I. Uman, U. Strohbusch, A. V. Anisovich, H. Matthäy, Herbert Koch, Michael Doser, K. Wittmack, J. Reinnarth, K. Braune, P. Kammel, B. Pick, W. Dünnweber, Claude Amsler, F. H. Heinsius, J.S. Suh, Marcel Kunze, Pàl Hidas, and M. Ratajczak

Subjects
Physics, Nuclear physics, Crystal, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, Deuterium, Antiproton, Partial wave analysis, Neutron, Nuclear Experiment, Spectroscopy
Abstract

Data are presented on antiproton neutron annihilation at rest into ωπ − π 0 taken with the Crystal Barrel detector at LEAR (CERN) using a liquid deuterium target. The partial wave analysis shows evidence for at least two ωπ vector resonances above the ρ (770) ground-state. Possible evidence for a third ρ ′ state with a mass around 1180 MeV is discussed. The results are compared to model dependent predictions concerning the nature of the ρ ′ states.

Published
2004
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2. Annihilation at rest of antiprotons and protons into neutral particles

Author

M. Suffert, C.J. Batty, A. V. Anisovich, V. Crede, U. Thoma, H. Kalinowsky, N.P. Hessey, J.S. Suh, C.A. Baker, C. A. Meyer, M. Heinzelmann, W. Dünnweber, Michael Doser, F. H. Heinsius, D. Jamnik, R. Landua, S. Wallis-Plachner, D. Engelhardt, M. Benayoun, M. A. Faessler, Marcel Kunze, Herbert Koch, Kenneth M. Crowe, K. Wittmack, B. Pick, S. Spanier, K. Peters, D. Walther, B. S. Zou, Claude Amsler, J. Kisiel, U. Strohbusch, U. Wiedner, U. Kurilla, K. Braune, Pàl Hidas, I. Uman, A. V. Sarantsev, P. Kammel, B.M. Barnett, W. Popkov, L. Montanet, R. P. Haddock, P. Blüm, D.V. Bugg, J. Reinnarth, T. Case, H. Matthäy, M. Ratajczak, W. Roethel, Eberhard Klempt, R. Ouared, F. Meyer-Wildhagen, and C. Regenfus

Subjects
Rest (physics), Physics, Nuclear and High Energy Physics, Annihilation, Meson, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, 7. Clean energy, Nuclear physics, Crystal, Antiproton, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Liquid hydrogen, Bar (unit)
Abstract

Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing π 0 , η , η ′ and ω mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. Including annihilation frequencies for production of neutral kaons from other experiments, the identified reactions for annihilation in liquid hydrogen add up to a branching fraction of (3.56±0.28)% per annihilation compared to the frequency of (3.50±0.30)% with which we observe the all-neutral decay modes inclusively. Since the exclusive final states are normalized to the Crystal Barrel measurement of the π 0 π 0 branching ratio, the latter result is strongly supported by this present study.

Published
2003
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3. Study of at rest

Author

T. Case, H. Matthäy, A. Berdoz, S. Wallis, B. S. Zou, M. Suffert, R. Seibert, P. Kammel, M. Ratajczak, I. Scott, B.M. Barnett, A. Ehmanns, R. Ouared, C. Holtzhaußen, Nigel Hessey, C. Kolo, F. H. Heinsius, R. Landua, B. Pick, Pàl Hidas, H. Stöck, J. Kisiel, C. Völcker, P. Blüm, N. Djaoshvili, Eberhard Klempt, Marcel Kunze, D.V. Bugg, S. Bischoff, K. Wittmack, V. Crede, T. Degener, S. Resag, A. Herbstrith, O. Cramer, M. A. Faessler, M. Herz, U. Kurilla, C.A. Baker, U. Thoma, C. Hodd, J. Adomeit, P. Schmidt, Herbert Koch, C. Regenfus, M. Lakata, W. Dünnweber, A.N. Sarantsev, R. McCrady, M. Benayoun, K. Braune, C. A. Meyer, Kenneth M. Crowe, C. N. Pinder, W. Röthel, H. Kalinowsky, J. Meier, U. Wiedner, M. Tischhäuser, K. Beuchert, D. Jamnik, D. Engelhardt, A. Abele, R. P. Haddock, D. Walther, U. Strohbusch, C. Straßburger, Michael Doser, D. Ryabchikov, L. Montanet, B. Kämmle, C.J. Batty, and K. Peters

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Amplitude, Meson, Hydrogen, chemistry, Branching fraction, Mass spectrum, Resonance, chemistry.chemical_element, Atomic physics, Bar (unit)
Abstract

Crystal Barrel data are presented on p−p → ηπ0π0π0 at rest in liquid hydrogen and also in gaseous hydrogen at 12 bar. Annihilation from the initial 3P0 state relative to 3P2 is stronger in liquid than in gas by a factor 2.46 ± 0.15, in fair agreement with a prediction by Batty. There is a definite peak due to η(1440). Liquid data determine its mass as M = 1413 MeV, Γ = 49 ± 8 MeV. The mass is, however, lower in gas than in liquid by 12 ± 3 MeV; we attribute this mass shift to interference with broad background amplitudes. The η (1440) decays dominantly to ησ: BR [a0(980)π,a0 → ηπ]/BR[ησ] = 0.4 ± 0.2. However, there is strong destructive interference between these two decay modes. There is also a strong, broad ηππ component with JPC = 0−+, consistent with an earlier analysis proposing a very wide η(1800) resonance; it contributes 31% of the ηπ0π0π0 branching ratio in liquid. At the highest ηππ masses, there are definite 2−+ and l++ signals, but we cannot establish precise resonance masses or widths. There is also evidence for the production of f2 (1565), decaying to a2 (1320)π.

Published
1998
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4. Momentum dependence of the decay η→π+π−π0

Author

C. Völcker, K. Beuchert, H. Stöck, A. Ehmanns, M. Heinzelmann, C. Pietra, H. Matthäy, N. Djaoshvili, U. Wiedner, R. Ouared, I. Scott, P. Giarritta, S. Spanier, C. Kolo, U. Kurilla, B. Pick, O. Cramer, F.H. Heinsius, L. Montanet, B. Kämmle, M. Ratajczak, Michael Doser, M. Suffert, A. Herbstrith, D. Walther, S. Wallis, R. Seibert, V. Crede, U. Strohbusch, C. Straßburger, S. Resag, K. Braune, P. Kammel, T. Case, P. Blüm, K.M. Crowe, C. A. Meyer, B.M. Barnett, M. Tischhäuser, M. Herz, K. Peters, R. P. Haddock, K. Wittmack, C. N. Pinder, D.V. Bugg, J. Kisiel, H. Koch, P. Hidas, Claude Amsler, C. J. Batty, N.P. Hessey, C. A. Baker, U. Thoma, C. Hodd, B. S. Zou, M. A. Faessler, T. Degener, P. Schmidt, M. Lakata, W. Dünnweber, H. Kalinowsky, J. Meier, M. Benayoun, R. McCrady, C. Holtzhaußen, C. Regenfus, A. Berdoz, R. Landua, S. Bischoff, J. Adomeit, D. Jamnik, D. Engelhardt, A. Abele, M. Kunze, W. Roethel, F. Ould-Saada, S. v. Dombrowski, and Eberhard Klempt

Subjects
Crystal, Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Chiral perturbation theory, Physics::Instrumentation and Detectors, Detector, Barrel (horology), Dalitz plot
Abstract

The π 0 momentum dependence of the decay η → π + π − π 0 has been measured with the Crystal Barrel detector. The analysis is based on 3230 events. The results of this independent measurement are compared to new chiral perturbation theory calculations and previous measurements.

Published
1998
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5. Measurement of the ω → ηγ decay branching ratio

Author

C.A. Baker, A. Ehmanns, J. Kisiel, U. Wiedner, R. P. Haddock, C. Völcker, C. Pietra, Eberhard Klempt, C. N. Pinder, M. Benayoun, S. v. Dombrowski, L. Montanet, F.H. Heinsius, B. Kämmle, K. Beuchert, Marcel Kunze, M. Heinzelmann, Herbert Koch, P. Giarritta, D. Jamnik, P. Blüm, R. Ouared, D. Engelhardt, A. Abele, O. Cramer, I. Scott, V. Crede, U. Strohbusch, C. Straßburger, C. Holtzhaußen, D. Walther, Pàl Hidas, B. Pick, M. Tischhäuser, S. Bischoff, D.V. Bugg, H. Kalinowsky, H. Stöck, R. Landua, Michael Doser, A. Cooper, J. Lüdemann, B. Kalteyer, N.P. Hessey, J. Meier, U. Kurilla, K.M. Crowe, S. Wallis, C.J. Batty, M. A. Faessler, S. Spanier, C. Kolo, R. Hackmann, T. Case, N. Djaoshvili, M. Suffert, R. Seibert, P. Kammel, Claude Amsler, S. Resag, B.M. Barnett, B. S. Zou, K. Peters, M. Lakata, C. Regenfus, C. A. Meyer, K. Braune, U. Thoma, C. Hodd, P. Schmidt, W. Dünnweber, R. McCrady, J. Adomeit, H. Matthäy, A. Berdoz, F. Ould-Saada, T. Degener, M. Ratajczak, W. Roethel, and M. Herz

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Branching fraction, Radiative decay, Mixing (physics)
Abstract

We have measured the branching ratio for the radiative decay ω → ηγ with ω mesons produced in antiproton-proton annihilation at rest into π0ω and ηω. Taking into account ϱ - ω mixing we find a branching ratio B(ω → ηγ) = (6.6 ± 1.7) × 10−4, in accord with the constructive interference solution in other experiments. The upper-limit for the direct radiative decay ω → 3γ is 1.9 × 10−4 at 95% confidence level.

Published
1997
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6. Study of the ππη′ final state in p̄p annihilation at rest

Author

U. Wiedner, V. Crede, M. Suffert, R. Seibert, K.M. Crowe, M. Heinzelmann, I. Scott, M. Herz, J. Kisiel, C. Holtzhauβen, A. Cooper, A. Ehmanns, U. Kurilla, M. Tischhäuser, H. Matthäy, P. Giarritta, L. Montanet, S. Spanier, B. Kämmle, C. Kolo, N.P. Hessey, J. Adomeit, R. Hackmann, W. Roethel, M. A. Faessler, A. Berdoz, S. Resag, C.A. Baker, P. Kammel, N. Djaoshvili, F. Ould-Saada, B.M. Barnett, U. Thoma, C. Hodd, M. Benayoun, F.H. Heinsius, T. Degener, P. Blüm, R. Ouared, B. Pick, K. Beuchert, M. Ratajczak, C. Regenfus, D.V. Bugg, D. Jamnik, H. Kalinowsky, D. Engelhardt, A. Abele, B. Kalteyer, J. Meier, S. Bischoff, K. Braune, C. Straβburger, Pàl Hidas, Claude Amsler, C. Völcker, R. P. Haddock, Marcel Kunze, B. S. Zou, C. Pietra, C. N. Pinder, S. v. Dombrowski, Eberhard Klempt, T. Kiel, H. Stöck, C.J. Batty, O. Cramer, D. Walther, U. Strohbusch, J. Lüdemann, R. Landua, P. Schmidt, W. Dünnweber, R. McCrady, C. A. Meyer, K. Peters, M. Lakata, Herbert Koch, T. Case, and Michael Doser

Subjects
Nuclear physics, Physics, Rest (physics), Nuclear and High Energy Physics, Particle physics, Annihilation, Branching fraction, Partial wave analysis, State (functional analysis)
Abstract

A partial wave analysis of pp → π0π0η′ has been performed using the η′ → π0π0η and η′ → γγ decay modes. The data are dominated by an η′ recoiling against the (ππ) S-wave. In addition, α2 (1320) → η′π0 is needed. There is evidence for contributions from α0(1450) → η′π0. The branching ratio of α0(1450) → η′π0 with respect to ηπ0 is consistent with the prediction of SU(3).

Published
1997
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7. Coupled channel analysis of p annihilation into π0π0π0, π0ηη and π0π0η

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Dalitz plot, Channel analysis
Abstract

We confirm the existence of the two IG(JPC) = 0+(0++) resonances f0(1370) and f0(1500) reported by us in earlier analyses. The analysis presented here couples the final states π0π0π0, π0π0η and π0ηη of pp annihilation at rest. It is based on a 3 × 3 K-matrix. We find masses and widths of M = (1390±30) MeV, Γ = (380±80) MeV; and M = (1500±10) MeV, Γ = (154 ± 30) MeV, respectively. The product branching ratios for the production and decay into π0π0 and ηη of the f0(1500) are (1.27 ± 0.33) · 10−3 and (0.60 ± 0.17) · 10−3, respectively.

Published
1995
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8. First observation of the production of nucleon resonances in antiproton annihilation in liquid deuterium

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Deuterium, Antiproton, Nucleon, Particle Physics - Experiment
Published
1995
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9. High-statistics study of f0(1500) decay into π0π0

Author

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

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

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

Published
1995
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10. ηη′ threshold enhancement in p̄p annihilations into π0ηη′ at rest

Author

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

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

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

Published
1994
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11. Observation of a new IG(JPC)=1−(0++) resonance at 1450 MeV

Author

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

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

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

Published
1994
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12. 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
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13. Antiproton-proton annihilation at rest into two mesons

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Antiproton, Radiative transfer, High Energy Physics::Experiment, Nuclear Experiment, Liquid hydrogen
Abstract

Branching ratios for antiproton-proton annihilations at rest into two mesons are given. The data were obtained at LEAR by stopping antiprotons in a liquid hydrogen target. Both charged and neutral annihilation products were detected in the Crystal Barrel detector. Representative data are presented, and their bearing on the general picture of annihilation dynamics is discussed. In addition, preliminary branching ratios for two-body radiative annihilations are given.

Published
1993
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14. P- versus S-wave at rest in LH2

Author

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

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

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

Published
1992
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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
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16. Isospin invariance in the reaction n + p → π° + d

Author

B.L. Schrock, J. A. Helland, R. P. Haddock, K.K. Young, D. Cheng, Victor Perez-Mendez, M. J. Longo, and S. S. Wilson

Subjects
Physics, Nuclear and High Energy Physics, Cross section (physics), Deuterium, Invariance principle, Isospin, Nuclear Theory, Neutron, Atomic physics, Inelastic scattering, Nuclear Experiment, Kinetic energy, Neutron temperature
Abstract

A measurement of the differential cross section for the reaction n+p --*d+ 7r ° has been made using a neutron beam with kinetic energies up to 720 MeV. The angle and momentum of the deuterons were measured using an analyzing magnet and wire spark chambers with a magnetostrietive readout. The photons from the decaying ~o were not detected. The neutron energy was calculated from the measured deuteron angle and momentum. The cross sections are compared to those for the reaction n++d ~ p+p as a test of isotopic spin invariance in strong interactions. The symmetry of the cross sections about 90 ° is also investigated, and an upper limit of about 1% is placed on the real part of the ratio of isospin-violatin g to isospin-conservi ng amplitudes. A measurement of the differential cross sections for the reaction n+p-* d+~ ° has been made at the L. R. L. 184-inch cyclotron with incident neutron energies from threshold to 720 MeV. The results serve as a test of isotopic spin invariance of strong interactions. The experiment was set up primarily to test time reversal invariance in the photodisintegrat ion of the deuteron by measuring the cross section for the reaction n+p~d+v [1], but, with very little extra effort, about 4.5 × 105 events were taken to obtain the n+p~d+~ o cross section. After accidentals were eliminated and fiducial cuts applied, about 2.5× 105 events remained. Half of these events were the desired d+~ ° production with ~1% contamination from the d+7 reaction. The remaining events were from neutron elastic and inelastic scattering.

Published
1971
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