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1. Further analysis of , ηηπ0 and ηπ0π0 at rest

Author

M. Suffert, R. Seibert, C.A. Baker, T. Kiel, C. Strassburger, O. Cramer, M. Benayoun, G. Pinter, Kenneth M. Crowe, C. N. Pinder, D. S. Armstrong, Herbert Koch, P. Schmidt, J. Adomeit, L. Montanet, W. Dünnweber, C.J. Batty, C. Kolo, R. McCrady, Nigel Hessey, A. Berdoz, Ingrid U. Scott, N. Djaoshvili, B. Kaemmle, T. Case, D. Walther, B.S. Zou, C. Holtzhaussen, P. Blüm, Pàl Hidas, U. Strohbusch, M. A. Faessler, R.P. Haddock, A. V. Sarantsev, H. Matthaey, D.V. Bugg, J. Meier, C. Voelcker, J. Reissmann, H. P. Dietz, A. Cooper, K. Braune, M. Tischhaeuser, M. Lakata, P. Kammel, C. A. Meyer, F. H. Heinsius, P. Illinger, C. Regenfus, U. Thoma, S. Bischoff, M. Herz, M. Englert, W. Roethel, K. Beuchert, D. Jamnik, D. Engelhardt, and A. Abele

Subjects
Rest (physics), Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Dalitz plot
Published
1996
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2. Evidence for two isospin zeroJ PC=2−+ mesons at 1645 and 1875 MeV

Author

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

Subjects
Nuclear physics, Physics, Physics and Astronomy (miscellaneous), Meson, Isospin, Zero (complex analysis), High mass, Dalitz plot, Resonance, Atomic physics, Rest frame, Bar (unit)
Abstract

Data on\(\bar pp \to \eta \pi ^0 \pi ^0 \pi ^0 \) taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for twoI=0JPC=2−+ resonances inηππ. The first, at 1645±14(stat.)±15(syst.) MeV with width 180−21+40±25 MeV, decays toα2(1320)π withL=0. It may be interpreted as the\(q\bar q^1 \)D2 partner ofπ2(1670). A strong signal is also observed just above threshold inf2(1270)η withL=0. It is 11–22 times stronger than is expected for the high mass tail of the 1645 MeV resonance. It can be fitted as a second 2−+ resonance at 1875±20±35 MeV with width 200±25±45 MeV. A third resonance havingJPC=2++ is observed at 2135±20±45 MeV withΛ=250±25±45 MeV, decaying to botha2(1320)π andf2(1270)η withL=1. There is no evidence for resonances with decays toa0(980)π, ση orf0(980)η.

Published
1996
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3. E decays to ηππ in annihilation at rest

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Angular distribution, Annihilation, Meson, Branching fraction, Isoscalar, Mass spectrum
Abstract

We have observed the ηπ + π − and ηπ 0 π 0 decay modes of the E meson in p p annihilation at rest into π + π − π 0 π 0 η . The mass and width of the E meson are 1409 ± 3 and 86 ± 10 MeV. The production and decay branching ratio is B( p p → Eππ)B(E → ηππ) = (3.3 ± 1.0) × 10 −3 . With a spin-parity analysis we determine that J P = 0 − . The observation of the ηπ 0 π 0 decay mode establishes that E is isoscalar ( C = +1). We find that E decays to η ( ππ ) s (where ( ππ ) s is an S-wave dipion) and πa 0 (980)(→ πη ) with a relative branching ratio of (78 ± 16) %. Using the K K π production and decay branching ratio measured earlier we determine that B[E → K K π] B[E → ηππ] = 0.61 ± 0.19 . A comparison with observations in radiative J Ψ decays suggests that E and ι η (1416) are identical.

Published
1995
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4. 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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5. 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
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6. 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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7. 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
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8. 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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9. Hidden and open $$\bar ss$$ production in $$\bar pp$$ annihilation at restannihilation at rest

Author

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

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, OZI rule, High Energy Physics::Phenomenology, Dalitz plot, High Energy Physics::Experiment
Abstract

New branching ratios for\(\bar pp\) annihilation at rest into final states with a\(K\bar K\) pair or φ-meson are being measured with the Crystal Barrel detector at LEAR. The yield of φγ, relative to ωγ, appears to violate the OZI rule as strongly as φπ relative to ωπ.

Published
1994
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10. High-statistics analysis of $$\bar pp \to \pi ^0 \pi ^0 \pi ^0 $$ at restat rest

Author

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

Subjects
Nuclear physics, Rest (physics), Physics, Particle physics, Annihilation, Amplitude, Pi, Dalitz plot, Invariant (mathematics), Nuclear Experiment, Resonance (particle physics), Bar (unit)
Abstract

Antiproton-proton annihilation at rest into 3π0 is analysed based on a data sample of about 500 000 high-quality 3π0 events. In this high-statistics Dalitz plot two structures in the region of π0π0 invariant masses of about 1500 MeV show up, a small band and a blob at higher masses. In a first attempt to describe the data two different models are used to parametrize the dynamical amplitudes leading to the same conclusion: the data require a 0+ + and also a 2+ + resonance in the 1500 MeV region.

Published
1994
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11. Test of chiral perturbation theory in η decays

Author

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

Subjects
Quantum chromodynamics, Crystal, Nuclear physics, Physics, Particle physics, Chiral perturbation theory, Pion, Partial width, Order (group theory), Charged particle
Abstract

The decay of the η-meson into three pions plays an important role as a test of low-energy QCD calculations in the framework of chiral perturbation theory. Previous experiments show results that are inconclusive or even contradictory. The Crystal Barrel experiment at LEAR has determined the braching ratiosΓ(η→3π0)/Γ(η→π+π−π0)=1.47±0.09±0.15 andΓ(η→γγ)/Γ(η→π+π−π0)=1.88±0.10±0.17 using its unique features to detect charged particles as well as neutral particles. The value for the first ratio agrees nicely with the theoretical predictions and solves previous experimental uncertainties. The second value, which yields a partial width ofΓ(η→π+π−π0)=(0.24±0.03) keV, shows that the same next-to-leading order chiral perturbation theory calculations still have some problems.

Published
1994
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12. $$\bar pp$$ Annihilation at rest into K L 0 K S 0 π0π0Annihilation at rest into K L 0 K S 0 π0π0

Author

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

Subjects
Physics, Rest (physics), Nuclear physics, Particle physics, Annihilation, Hadron spectroscopy, Partial wave analysis
Published
1994
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13. Antiproton annihilation at rest in liquid deuterium into π−π0π0pS

Author

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

Subjects
Nuclear physics, Physics, Crystal, Annihilation, Deuterium, Antiproton, Partial wave analysis, Resonance, Dalitz plot, Atomic physics, Parametrization
Abstract

With the Crystal Barrel detector, the final state π−π0π0pS at rest in liquid deuterium was measured for the first time. A preliminary partial-wave analysis was performed, which required two interesting features: besides the ρ(770), a second pole was needed in the ππP-wave and a narrow resonance in the ππS-wave, slightly above 1500 MeV/c2. With the same parametrization a high-statistics π+π−π0 data set could also be well described.

Published
1994
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14. 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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15. 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
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16. 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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17. 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
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18. 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
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19. 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
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20. New states as observed by the Crystal Barrel experiment

Author

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

Subjects
Nuclear physics, Crystal, Physics, Nuclear and High Energy Physics, Barrel, Annihilation, Protonium, Branching fraction, Isoscalar, Resonance, State (functional analysis), Atomic physics
Abstract

The Crystal Barrel Detector has been in operation since October 1989. Results on the analysis of the annihilation of protonium at rest into three pseudoscalars is presented. The π 0 π 0 π 0 final state confirms the existence of ƒ 2 (1520)→π 0 π 0 . In the ηη system of the π 0 ηη final state an isoscalar J PC = 0 ++ resonance with a mass of 1560 MeV/c 2 and a width of 245 MeV/c 2 is observed. The identification with ƒ 0 (1590) is doubtful since the ηη' decay is not observed with the corresponding strength. Our analysis yields an upper limit for the relative branching ratio BR(ƒ 0 (1560)→ηη') BR(ƒ 0 (1560)→ηη) .

Published
1993
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21. Final states with strangeness from Crystal Barrel and Asterix

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Mass spectrum, Dalitz plot, ASTERIX, Strangeness
Abstract

We discuss φ production in p p annihilation at rest from the Asterix and Crystal Barrel experiments and compare the branching ratios to similar final states without strangeness. The ωπ 0 φπ 0 production ratio is unexpectedly low. In the search for new states, the φπ0 mass spectrum shows no evidence for a resonance in the 1450 MeV/c2 mass range but the K☆K0π0 Dalitz plot shows interesting structure.

Published
1993
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22. Antiproton-proton annihilation in-flight

Author

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

Subjects
Physics, Particle physics, Annihilation, Proton, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Dalitz plot, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Pseudoscalar, Nuclear physics, Antiproton, 0103 physical sciences, Invariant mass, Nuclear Experiment, 010306 general physics, Bar (unit)
Abstract

This is an overview of the preliminary results of\(\bar pp\) annihilation at incident\(\bar p\) momenta of 600, 1200 and 1940 MeV/c(*). The data was taken at LEAR with the Crystal Barrel Detector (E. Akeret al.:Nucl. Instrum. Methods A,321, 108 (1992)). In the two pseudoscalar final states seven different channels are observable and their angular distributions are measured. They are compared to older data, if existent, and are found to be equal within the experimental errors. In the three-meson final states, an overview of the already examined final states is given. Striking signals in the Dalitz plots and invariant-mass projections for a set of final states are observed. In the final states ηηπ0 and ηηη a signal ηη with the invariant mass of 1480 MeV/c2 and a width of aboutΓ≈≈70 MeV/c2 is visible. In the final-state ωηπ0 a signal in the ωη invariant-mass spectrum at 1680 MeV/c2 with a widthΓ≈150 MeV/c2 is observed. Finally, in the final-state ωωπ0 two visible structures in the Dalitz plot are detected at 1600 MeV/c2 (Γ≈90 MeV/c2) and 1900 MeV/c2 (Γ≈150 MeV/c2).

Published
1994

23. New results from crystal barrel

Author

Herbert Koch, L. Montanet, A. H. Sanjari, B. Kämmle, T. Case, J. Zoll, A. Cooper, P. Blüm, M. Suffert, C.A. Baker, D.V. Bugg, F. Walter, S. Spanier, J. P. Merlo, K. Königsmann, Pàl Hidas, C. A. Meyer, K. Beuchert, R. P. Haddock, C.J. Batty, A. Noble, N. Winter, D. Jamnik, D. Urner, D. Engelhardt, C. Kolo, D. S. Armstrong, Nigel Hessey, S. Ravndal, B. Schmid, G. Pinter, R. Hackmann, D. Walther, U. Wiedner, Claude Amsler, Michael Doser, H. Bossy, Mark J. Burchell, U. Strohbusch, J. Kisiel, J. Lüdemann, S. Waßmer, Č. Zupančič, T. Kiel, K. Braune, J. Salk, M. Englert, I. Augustin, F. H. Heinsius, C. Völcker, J. Bistirlich, K. Peters, C. Felix, S. v. Dombrowski, Marcel Kunze, Z. Jávorfi, F. Ould-Saada, C. Straßburger, P. Schmidt, W. Dünnweber, B. M. Barnett, P. Birien, R. Landua, R. Bossingham, H. Matthaey, S. U. Chung, K. M. Crowe, P. Illinger, M. Merkel, H. Kalinowsky, E. Schäfer, J. Brose, M. A. Faessler, Eberhard Klempt, H. P. Dietz, G. Folger, Michael Kobel, 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, Particle physics, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Barrel (horology), Dalitz plot, 01 natural sciences, 3. Good health, Crystal, Nuclear physics, Hadron spectroscopy, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Spectroscopy, Bar (unit)
Abstract

Results are presented on meson spectroscopy, two-body final states and meson decay modes observed in\(\bar pp\) annhilation at rest by the Crystal Barrel experiment at LEAR.

Published
1994

24. Observation of a 2$^{++}$ resonance at 1515 MeV in proton antiproton annihilations into 3$\pi^{0}$

Author

P. Blüm, U. Meyer-Berkhout, P. Birien, K. Königsmann, R. Beckmann, D. Urner, T. Case, R. P. Haddock, I. Augustin, Pàl Hidas, U. Strohbusch, Claude Amsler, P. Illinger, H. Koch, S. Cierjacks, James A. Bistirlich, B. M. Barnett, C. Pegel, C. A. Meyer, Eberhard Klempt, M. Suffert, C. Zupancic, W. Schott, B. Lewendel, M. A. Faessler, K. Peters, H. Bossy, D. Jamnik, L. Montanet, E. Aker, B. Kämmle, C.J. Batty, R. Bossingham, M. Merkel, K. Dederichs, K. Braune, N. Winter, Mark J. Burchell, D. Walther, D. Engelhardt, C.A. Baker, U. Wiedner, S. Ravndal, A. H. Sanjari, R. Landua, C. Felix, Kenneth M. Crowe, G. Folger, N. P. Hessey, H. Matthaey, H. Kalinowsky, W. Dünnweber, E. Schäfer, Bernhard Schmid, T. Kiel, C. Sutton, J. Zoll, S. M. Walther, F. H. Heinsius, and Marcel Kunze

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Proton, Antiproton, Degenerate energy levels, Resonance, Atomic physics, Particle Physics - Experiment
Abstract

Antiproton-proton annihilations at rest into 3 π 0 are analyzed in terms of π 0 π 0 final state interactions. A J PC = 2 + + resonance at a mass of 1515 ± 10 MeV with a width of 120 ± 10 MeV is required to explain the data. This result is supported by previous observations made on the ππ system in p p and p n annihilations which show that the resonance has I = 0. This resonance is practically degenerate in mass with the f′ 2 (1525) but the two resonances have very different production and decay characteristics.

Published
1991

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