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New data on the π+ π- angular distribution in the mass range 0.8 - 2.2 GeV/c2

Nuclear Physics, Section B 137:3 (1978) 221-252

Authors:

MJ Corden, JD Dowell, J Garvey, M Jobes, IR Kenyon, J Mawson, T McMahon, IF Corbett, RJ Esterling, NH Lipman, PJ Litchfield, KCTO Sumorok, G Alexander, S Dagan, Y Gnat, J Grunhaus, EH Bellamy, MG Green, N Harnew, JB Lister, JR Lister, PV March, AW Robertson, BJ Stacey, JA Strong, DH Thomas

Abstract:

An experiment has been performed on the Omega spectrometer to study the channel π-p → π+π-n at 12 and 15 GeV/. The π+π- angular distribution has been studied in the π+π- invariant-mass region 0.8-2.2 GeV/c2, for events with four-momentum transfer squared from proton to neutron in the range -0.02 to -0.15 (GeV/c)2. The spherical harmonic moments of the angular distribution are presented. Up to a mass of 1.7 GeV/c2 the moments agree with previous experiments. At higher masses Y70, Y80 and Y90 are non-zero and indicate the presence of ππ amplitudes with spin greater than 3. © 1978.
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A partial-wave analysis of the neutral 3π system produced in the reaction π-p → (π+π-π0) n at 12 and 15 GeV/c

Nuclear Physics, Section B 136:1 (1978) 77-94

Authors:

MJ Corden, JD Dowell, J Garvey, M Jobes, IR Kenyon, J Mawson, T McMahon, IF Corbett, RJ Esterling, NH Lipman, PJ Litchfield, KCTO Sumorok, G Alexander, S Dagan, Y Gnat, EH Bellamy, MG Green, N Harnew, JB Lister, JR Lister, AW Robertson, BJ Stacey, JA Strong, DH Thomas

Abstract:

Data on the charge-exchange reaction π-p → (π+π-π0)n have been taken at beam momenta of 12 and 15 GeV/c, using the CERN Omega Multiparticle Spectrometer. A partial-wave analysis has been made of the (3π)0 system. We observe both natural and unnatural spin-parity production. The natural parity states can be identified with established resonances. In addition a natural spin-parity enhancement is observed at a mass of about 2 GeV/c2 with JP = 4+ preferred. We have called this effect the A2* (2030). The unnatural spin-parity production found is consistent with reggeized Deck model predictions. No unambiguous A1 or A3 production is observed. © 1978.
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Observation of the D, E and δ mesons in π-p interactions at 12 and 15 GeV/c

Nuclear Physics, Section B 144:2-3 (1978) 253-268

Authors:

MJ Corden, JD Dowell, J Garvey, M Jobes, IR Kenyon, J Mawson, TJ McMahon, IF Corbett, RJ Esterling, NH Lipman, PJ Litchfield, KCTO Sumorok, G Alexander, S Dagan, Y Gnat, EH Bellamy, MG Green, N Harnew, JB Lister, JR Lister, AW Robertson, BJ Stacey, JA Strong, DH Thomas

Abstract:

We have observed the D(1285), E(1420) and δ(975) mesons produced in 12 and 15 GeV/c π-p interactions at the CERN Omega Spectrometer. Production cross sections and decay branching ratios are presented. Analysis of the decay D(1285) → δ(975) π favours a spin-parity assignment of 1+. © 1978.
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PRODUCTION OF A-2(O) AND OMEGA-STAR (1675) IN REACTION PI-P-]PI+PI-PION AT 12-GEV-C AND 15-GEV-C

NUCLEAR PHYSICS B 138:2 (1978) 235-252

Authors:

MJ CORDEN, JD DOWELL, J GARVEY, M JOBES, IR KENYON, J MAWSON, T MCMAHON, IF CORBETT, RJ ESTERLING, NH LIPMAN, PJ LITCHFIELD, KCTO SUMOROK, G ALEXANDER, S DAGAN, Y GNAT, EH BELLAMY, MG GREEN, N HARNEW, JB LISTER, JR LISTER, PV MARCH, AW ROBERTSON, BJ STACEY, JA STRONG, DH THOMAS
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f0 (1270) production in the reaction π-p → π+π-n at 12 and 15 GeV/c

Nuclear Physics, Section B 131:4-5 (1977) 365-385

Authors:

G Alexander, S Dagan, Y Gnat, J Grunhaus, MJ Corden, JD Dowell, J Garvey, M Jobes, IR Kenyon, J Mawson, T McMahon, IF Corbett, RJ Esterling, NH Lipman, PJ Litchfield, KCTO Sumorok, EH Bellamy, MG Green, N Harnew, JB Lister, JR Lister, PV March, AW Robertson, BJ Stacey, JA Strong, DH Thomas

Abstract:

The production of the f0 (1270) has been studied in the reaction π-p → π+π-n at 12 and 15 GeV/c in the momentum transfer range 0.02 to 0.80 GeV2. Differential and total cross sections for the reaction π-p → f0n have been determined. The f0 decay density matrix elements have been evaluated requiring all the matrix eigenvalues to be non-negative. The relative unnatural and natural parity exchange contributions to the f0 production have been studied. The results are compared with a Regge exchange model formulated in terms of the pion and A2 exchanges including cut contributions. © 1977.
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