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Five-pion final state in p p annihilations at 0.70 to 1.1 GeV/c

Burns, R.R. ; Condon, P.E. ; Donahue, J. ; et al.

Nucl.Phys.B 85 (1975) 337-353, 1975.

Inspire Record 1392678 DOI 10.17182/hepdata.32116

Results are reported on the reaction p p → π + π + π − π − π 0 at six lab momenta spanning the region from 0.686 to 1.098 GeV/ c . The cross section for this process drops from 20.3 ± 1.2 mb at 0.686 GeV/ c to 13 1.0 mb at 1.098 GeV/ c . Resonance production is determined by means of a model which includes Bose symmetrization, Breit-Wigner amplitudes and Bose-Einstein correlations for the like-charged pion pairs in the nonresonant part of the amplitude. The likelihood fit to the resonance channels yields about 0.8% ηππ , 12% ϱ ± πππ , 2% f πππ , 8% ω ππ , 22% ϱ ± ϱ 0 π , 13% ωϱ 0 and 9% ω f with errors on the order of a few percent. Several percent A 1 ± ππ and X(1440) π were also needed to obtain good fits. The ϱ 0 πππ and ϱ 0 ϱ 0 π channels as well as A 2 ππ and A 1 0 ππ are consistent with zero. Reasonable fits to the mass distributions are obtained. Production angular distributions are found to be essentially uniform. The angular correlations between pion pairs are approximately fit by the simple model of resonance production with Bose symmetrization.

2 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution.

Table 2

Axis error includes +- 0.0/0.0 contribution.

Resonance production by 8 GeV/c positive pions on protons

The Aachen-Berlin-CERN collaboration Deutschmann, M. ; Schulte, R. ; Weber, H. ; et al.

Phys.Lett. 12 (1964) 356-360, 1964.

Inspire Record 1389790 DOI 10.17182/hepdata.30824

None

1 data table

Table 1

Cross sections based on total PI+ P cross section =25.8 mb (Vondardel, PRL 8, 173 (1962)).

Backward π p elastic scattering at 2.85 and 3.30 GeV/c

Baker, W.F. ; Carlson, P.J. ; Chabaud, V. ; et al.

Phys.Lett.B 25 (1967) 361-364, 1967.

Inspire Record 1389663 DOI 10.17182/hepdata.29442

Backward elastic scattering has been measured for π + p at 2.85 and 3.30 GeV/ c and for π − p at 3.30 GeV/ c . The π + p angular distributions show steep backward peaks, whereas the π − p distribution is flatter. At 2.85 GeV/ c the π + p differential cross section close to 180° is more than twice that at 3.30 GeV/ c , supporting the assignment J P = 11 2 + for Δ δ (2420) resonance. The π + p data at 2.85 GeV/ c indicate the onset of a dip at cos θ c.m. ≈ −0.97.

3 data tables

Table 1

The data for cos(theta) = 1 is the extrapolation.

Table 2

The data for cos(theta) = 1 and U = 0 are the extrapolations.

Table 3

The data for cos(theta) = 1 and U = 0 are the extrapolations.

Observation of the heavy nucleon isobar $N^{∗}_\frac1{2}(3690)$

Bartke, J. ; Czyżewski, O. ; Danysz, J.A. ; et al.

Phys.Lett.B 24 (1967) 118-120, 1967.

Inspire Record 1389636 DOI 10.17182/hepdata.29588

The analysis of the eight-prong interactions of 8 GeV/ c π + with protons indicates the existence of the new heavy nucleon isobar with the mass M = 3.69 GeV and the isospin T = 1 2 .

1 data table

Table 1

No description provided.

Backward Kp elastic scattering at 3.55 GeV/c

Banaigs, J. ; Berger, J. ; Bonnel, C. ; et al.

Phys.Lett.B 24 (1967) 90462 317-320, 1967.

Inspire Record 1389626 DOI 10.17182/hepdata.29619

Backward elastic K⁺p and K⁻p scattering has been measured in the angular interval 168^o <θc.m. < 177^o. We find $(d σ/ d Ω) K$ ⁺p → pK⁺ = 17 ± 4 μb/sr and $(d σ/ d Ω) K$ ⁻p → pK⁻ < 0.6 μb/sr. K⁺p elastic scattering exhibits a backward peak.

2 data tables

Table 1

The data for cos(theta) = 1 is the extrapolation.

Table 2

The data for cos(theta) = 1 is the extrapolation.

The angular distribution of backward elastically scattered pions at 3.55 GeV/c

Baker, W.F. ; Carlson, P.J. ; Chabaud, V. ; et al.

Phys.Lett. 23 (1966) 605-609, 1966.

Inspire Record 1389621 DOI 10.17182/hepdata.29776

The elastic scattering of 3.55 GeV/ c π + and π − mesons by protons was measured at centre-of-mass angles between 165° and 177°. The angular distributions for 864 events show a steeply rising backward peak for π + p, while the shape is less clear for π − p.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

Extrapolations.

$K^- + p$ elastic scattering at 3.46 GeV/c

Gordon, J. ;

Phys.Lett. 21 (1966) 117-120, 1966.

Inspire Record 1389617 DOI 10.17182/hepdata.29930

1691 events were fitted to K - p elastic scatters at a K - momentum of 3.46 GeV/ c . The differential cross section as a function of 4 momentum transfer was fitted to exp ( A + Bt + Ct 2 ) with A = 3.7 B = 8.7 ( GeV / c ) −2 and C = 2.0 ( GeV / c ) −4 . The distribution is consistent with zero real part for the forward scattering amplitude.

1 data table

Table 1

D(SIG)/D(T) was fitted to EXP(CONST+SLOPE*T+SLOPE*T**2).

The transverse and longitudinal cross sections for electroproduction of pions near the Δ(1236)-isobar

Bartel, W. ; Dudelzak, B. ; Krehbiel, H. ; et al.

Phys.Lett.B 27 (1968) 660-662, 1968.

Inspire Record 1389642 DOI 10.17182/hepdata.29204

The reaction e + p → e ′+ N ∗ was studied for four momentum transfers up to 2.34 (GeV/ c ) 2 in the region of the 1236 MeV isobar. An analysis of the data in terms of the cross sections σ T and σ L for the absorption of transverse and longitudinal photons is given for invariant masses of the final pion nucleon system W =1.220 GeV and W =1.350 GeV.

3 data tables

Table 1

Total errors are presented.

Table 2

Total errors are presented.

Table 3

Total errors are presented.

Total cross-section for n-p and n-d scattering at 10 GeV/c neutron momentum

Engler, J. ; Horn, K. ; König, J. ; et al.

Phys.Lett.B 27 (1968) 599-601, 1968.

Inspire Record 1389110 DOI 10.17182/hepdata.752

The total neutron cross-sections were measured with high precision for hydrogen and deuterium. At an average neutron momentum of 10 GeV/c we obtained σ T (np)=39.5±0.5 mb and σ T (nd)=73.3±1.1 mb. These values are in excellent agreement with p-p and p-d total cross sections. No energy dependence was found for n-p cross section between 4 and 10 GeV/c.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.