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Further evidence for the decay mode x(0) ---> gamma gamma and determination of the branching ratio x(0) ---> gamma gamma/ x(0) ---> total

Basile, M. ; Bollini, D. ; Dalpiaz, P. ; et al.

Nucl.Phys.B 33 (1971) 29-41, 1971.

Inspire Record 68511 DOI 10.17182/hepdata.33085

41 ± 8 events of the type X 0 → γγ have been observed in a study of the reaction π − p → n(X 0 → γγ ) at 1.6 GeV/ c incident π -momentum. This provides further evidence to our previous observation of this new X 0 decay mode and allows the determination of the branching ratio Γ(X 0 →γγ) Γ(X 0 → total =(1.7 ± 0.4)%. The theoretical implications of this result are discussed.

1 data table

Table 1

THIS MEASUREMENT WHEN COMBINED WITH THE ETAPRIME PRODUCTION CROSS SECTION OF M. BASILE ET AL., NC 3A, 371 (1971) YIELDS A BR(ETAPRIME --> 2GAMMA) OF 1.7 +- 0.4 PCT.

Backward rho+ production in pi+ p reactions at 5.2 gev/c

Carlson, P.J. ; Fleury, P. ; Lundby, A. ; et al.

Phys.Lett.B 33 (1970) 502-504, 1970.

Inspire Record 69380 DOI 10.17182/hepdata.28538

Using wire spark chambers we have observed the backward production of ϱ + mesons in the reaction π + p → p (missing mass) at 5.2 GeV/ c . In the four-momentum interval −0.80 < u < −0.006 (GeV/ c ) 2 the angular distribution shows a backward peak. In contrast to backward π + p elastic scattering, there is no dip in the angular distribution at u ≈ −0.15 (GeV/ c ) 2 . The ϱ + decay is found to be compatible with isotropy.

1 data table

Table 1

No description provided.

Evidence for b(1220) production in an analysis of the reaction k- d ---> p(s) lambda pi+ pi- pi- pi0 at 3 gev/c

The SABRE collaboration Hoogland, W. ; Kluyver, J.C. ; De Vries, T. ; et al.

Phys.Lett.B 33 (1970) 631-634, 1970.

Inspire Record 69351 DOI 10.17182/hepdata.28535

In an analysis of the reaction K − n →Λ4π at 3 GeV c we find evidence for the production of the B(1220) resonance, mainly decaying in ωπ. For the mass and width we find (1236 ± 15) MeV c 2 and (132±20) MeV c 2 respectively. The cross section for the reaction K − n→ Λ +B(1220) is found to be (102±26) μ b.

1 data table

Table 1

No description provided.

Small momentum transfer pi+ production with linearly polarized photons

Burfeindt, H. ; Buschhorn, G. ; Geweniger, C. ; et al.

Phys.Lett.B 33 (1970) 509-510, 1970.

Inspire Record 69381 DOI 10.17182/hepdata.28537

Previous measurements of the cross section asymmetry for single π + production on protons with linearly polarized photons of 3.4 GeV have been extended to momentum transfers within the forward peak, i.e. − = 0.0026, 0.006 and 0.01 (GeV/ c ) 2 . The results are in good agreement with pion exchange models.

1 data table

Table 1

Axis error includes +- 6/6 contribution.

Measurement of neutron-proton charge exchange scattering at 8, 19 and 24 gev/c

Engler, J. ; Horn, K. ; Moennig, F. ; et al.

Phys.Lett.B 34 (1971) 528-532, 1971.

Inspire Record 69285 DOI 10.17182/hepdata.28571

The t -dependence of the differential cross-section for elastic neutron-proton charge exchange scattering has been measured at 8, 19.2 and 24 GeV/ c . The extremely narrow peak in the forward direction, previously observed for momenta up to 8 GeV/ c , presists at the higher momenta, and the t -dependence shows practically no change with energy. Approximate values of the absolute cross-section were also determined for these momenta.

4 data tables

Table 1

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Observation of k(l) - k(s) regeneration from liquid hydrogen. aachen-cern-turin collaboration,

Darriulat, P. ; Grosso, C. ; Holder, M. ; et al.

Phys.Lett.B 33 (1970) 433-437, 1970.

Inspire Record 69387 DOI 10.17182/hepdata.28718

The K L K S transmission regeneration of a K L beam traversing a liquid hydrogen target has been observed over the momentum interval 3.0–6.0 GeV/ c . Results are in good agreement with predictions based on dispersion relations.

2 data tables

Table 1

Regeneration amplitude.

Table 2

No description provided.

Compton scattering of 3.5 gev polarized photons on protons

Buschhorn, G. ; Criegee, L. ; Franke, G. ; et al.

Phys.Lett.B 37 (1971) 211-212, 1971.

Inspire Record 69081 DOI 10.17182/hepdata.28375

Elastic scattering of linearly polarized photons on protons has been measured between 3.2 and 3.7 GeV for four-momentum transfers ranging from −0.1 to −0.7 (GeV/ c ) 2 . The observed cross section asymmetry in this range is consistent with zero within ±0.05.

1 data table

Table 1

No description provided.

Polarization in proton proton elastic scattering at 10, 14 and 17.5 gev/c

Borghini, M. ; Dick, L. ; Olivier, J.C. ; et al.

Phys.Lett.B 36 (1971) 501-503, 1971.

Inspire Record 69146 DOI 10.17182/hepdata.37233

Data on the polarization parameter in pp elastic scattering in the | t |-range from ∼0.1 to ∼ 2.9 (GeV/ c ) 2 and at 10, 14 and 17.5 GeV/ c are presented.

3 data tables

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