Buchanan, J.A.
Pion-Proton Scattering
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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.


PARTIAL WAVE ANALYSIS OF THE K+ PI+ K- SYSTEM SEEN IN THE REACTION PI+ P ---> K+ PI+ K- P AT 11.46-GeV/c

Leedom, I.D. ; DeBonte, R.J. ; Gaidos, J.A. ; et al.
Phys.Rev.D 27 (1983) 1426, 1983.
Inspire Record 194990 DOI 10.17182/hepdata.23837

We present results of a hybrid-bubble-chamber experiment examining the reaction π+p→π+pK+K− at an incident momentum of 11.46 GeV/c. The total cross section for this channel is determined to be 87.2±6.4 μb. A partial-wave analysis of the K+π+K− system reveals no unambiguous evidence of resonant activity, although mass enhancements are noted in the JP=0− κ¯K+ (S wave), JP=2− fπ (S wave), and JP=2−, K¯*0(892)K+ (P wave). This is the first published report of the relative phases of the waves seen in this reaction. We comment on the influence this channel may have on A1 and A3 production.

4 data tables
Table 1

NOTE ERROR IN ABSTRACT IS +- 6.4 BUT TEXT QUOTES +- 9.3. FIGURE LOOKS CLOSER TO +- 6.4.

Table 2

No description provided.

Table 3

No description provided.

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BACKWARD PRODUCTION OF THE B (1235) MESON IN 11.46-GEV/C PI+ P INTERACTIONS

Wong, M.K. ; Key, A.W. ; Schwarzschild, B.M. ; et al.
Phys.Rev.Lett. 46 (1981) 974, 1981.
Inspire Record 169864 DOI 10.17182/hepdata.20643

Evidence for the backward production of the B(1235) meson in the final state π+p→pfπ+ω at 11.46 GeV/c with σ(|u′|<1.5 GeV2)=1.28±0.26 μb is presented. When nucleon exchange is assumed to dominate, estimates for the SU(3) mixing parameter FD as well as the B coupling to the nucleon-antinucleon are given. Some indication of a narrow enhancement at M(π+ω)≃1.03 GeV/c2 is seen, but confirmation of this as a resonant state is not yet possible.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Q1 Production by Hypercharge Exchange in $\pi^- p$ Interactions at 3.95-{GeV}/$c$

The CERN-College de France-Madrid-Stockholm collaboration Rodeback, S. ; Sjogren, I. ; Holmgren, S.O. ; et al.
Z.Phys.C 9 (1981) 9, 1981.
Inspire Record 156683 DOI 10.17182/hepdata.13426

Q-meson production is studied in the hypercharge exchange reaction π-p → (Kππ)Λ at 3.95 GeV/c by selecting events witht(π- →Kππ)>1.2GeV2. An enhancement with a mass of 1294±10 MeV and a width of 66±15 MeV is observed in the (Kππ) mass distribution. A spin-parity analysis of the (Kππ) decay Dalitz plot shows the enhancement to be in theJP=1+S(Kϱ) wave and is therefore attributed toQ1-meson production. No evidence is found for the decayQ1→K0ω but limited statistics allow only placing an upper limit of 30% for the decay ratioKω/Kϱ0. TheQ1 production cross section fort(π- →Kππ)>1.2GeV2 is 8±1.3 μb. No evidence is found for the process π-p→Q2Λ withQ2→K*π for which the partial wave analysis gives an upper cross section limit of 2.5 μb at the 95% confidence level.

2 data tables
Table 1

PRODUCTION OF Q1 OF MASS 1294 +- 10 MEV, WIDTH 66 +- 15 MEV. IN BACKWARD HEMISPHERE, CROSS SECTION IS <0.5 MUB (CL = 95 PCT).

Table 2

UPPER LIMIT FOR PRODUCTION OF Q2 OF MASS AROUND 1400 MEV.


Study of Hypercharge Exchange Reactions of the Type 0- 1/2+ $\to$ 2+ 1/2+ at 4-{GeV}/$c$

The CERN-College de France-Madrid-Stockholm collaboration Aguilar-Benitez, M. ; Albajar, M.C. ; Ferrando, A. ; et al.
Z.Phys.C 8 (1981) 313, 1981.
Inspire Record 156685 DOI 10.17182/hepdata.13530

Results are presented for the quasi two-body hypercharge exchange reactions of the type 0−1/2+→2+1/2+:$$\begin{gathered}

12 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Exotic Exchange Processes in $K^- p$ and $\pi^- p$ Interactions at 4-{GeV}/$c$

The CERN-College de France-Madrid-Stockholm collaboration Irving, A.C. ; Loverre, P.F. ; Armenteros, R. ; et al.
Nucl.Phys.B 193 (1981) 1-20, 1981.
Inspire Record 156213 DOI 10.17182/hepdata.34203

Exotic exchange processes observed in K − p and π − p scattering in the neighbourhoood of 4 GeV/ c are analysed in terms of standard models. Some new data on π − p induced processes are presented and used in the analysis. Regge-Regge cut predictions are found to be smaller than the data up to these energies. Baryonium exchange models are shown to be indistindistinguishable from Regge cut models as regards their phenomenological predictions. The double scattering quark model of Białas and Zalewski is compatible with data on the exotic exchange production of Σ and Y ∗ (1385), but fails for Ξ and Ξ ∗ (1530) production. Modifications of this model are discussed.

6 data tables
Table 1

No description provided.

Table 2

FORWARD (SMALL -T) CROSS SECTIONS. THE K- P CROSS SECTIONS ARE COMPUTED FROM THE ACNO DATA AT 4.2 GEV/C, M. MAZZUCATO ET AL., NP B178, 1 (1981).

Table 3

BACKWARD (SMALL -U) CROSS SECTIONS.

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Study of the Reactions $\pi^- p \to K^0(890)\Lambda$, $K^0(890) \Sigma^0$ and $K^0(890) \Sigma^0(1385)$ at 3.95-{GeV}/$c$

The CERN-College de France-Madrid-Stockholm collaboration Aguilar-Benitez, M. ; Albajar, M.C. ; Ferrando, A. ; et al.
Z.Phys.C 6 (1980) 195-215, 1980.
Inspire Record 153917 DOI 10.17182/hepdata.1428

The reactionsπ−p→K0(890) Λ,K0(890)Σ0 andK0(890)Σ0 are studied at an incident momentum of 3.95 GeV/c using data from a high statistics bubble chamber experiment corresponding to ∼90 events/μb. The differential cross sections, density matrix elements of the vector meson and hyperon polarizations are presented. A transversity amplitude analysis is performed for each of the reactions. The results are compared with those obtained for the SU(3) related processesK−p→ϕΔ, ϕΣ0, ϕΣ0(1385) andϱ−Σ+(1385) and with predictions of the additive quark model and SU(6) sum rules.

39 data tables
Table 1

BREIT-WIGNER FIT WITH BACKGROUND POLYNOMIAL.

Table 2

BACKWARD CROSS SECTION.

Table 3

TOTAL CROSS SECTION USING SLICING TECHNIQUE. FORWARD (-TP < 1.2 GEV**2) CROSS SECTION IS 25 +- 2 MUB: DOUBLE MASS CUT GIVES 20 +- 7 PCT BACKGROUND CONTAMINATION.

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Study of the Reactions $\pi^- p \to K^0 \Sigma^0(1385)$ and $\pi^- p \to K^+ \Sigma^-(1385)$ at 3.95-{GeV}/$c$

The CERN-College de France-Madrid-Stockholm collaboration Aguilar-Benitez, M. ; Albajar, M.C. ; Ferrando, A. ; et al.
Z.Phys.C 6 (1980) 109-123, 1980.
Inspire Record 153921 DOI 10.17182/hepdata.14369

The reactionsπ−p→K0∑0(1385) andπ−p→K+∑−(1385) are studied at an incident momentum of 3.95 GeV/c using data from a high statistics bubble chamber experiment corresponding to approximately 90 events/μb. The total and differential cross sections and the density matrix elements of the Σ(1385) are presented. The results are compared with those obtained for the related processesπpp→K+∑+(1385) and\(K^ -p \to \pi ^ \mp\sum ^ \pm(1385)\) in this energy range. Evidence is presented for the existence of production mechanisms with exotic exchanges in thet channel.

16 data tables
Table 1

FROM THE CHANNEL PI- P --> LAMBDA K0 PI0 WHICH HAS A CROSS SECTION OF 72 +- 4 MUB.

Table 2

FROM THE CHANNEL PI- P --> LAMBDA K+ PI- WHICH HAS A CROSS SECTION OF 79 +- 3 MUB.

Table 3

FORWARD CROSS SECTION.

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Study of the Reactions $\pi^- p \to K^0 \Lambda$ and $\pi^- p \to K^0 \Sigma^0$ at 3.95-{GeV}/$c$

The CERN-College de France-Madrid-Stockholm collaboration Loverre, P.F. ; Armenteros, R. ; Dionisi, C. ; et al.
Z.Phys.C 6 (1980) 283, 1980.
Inspire Record 153918 DOI 10.17182/hepdata.14374

The reactions π−p→K0Λ,K0Σ0 are studied at an incident momentum of 3.95 GeV/c using data from a high statistics bubble chamber experiment corresponding to ∼90 events/μb. The differential cross sections and hyperon polarizations are presented and compared with existing data from earlier electronic experiments. The data in the forward hemisphere are used to perform an amplitude analysis of the 0−1/2+→0−1/2+ hypercharge exchange processes.

9 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Observation and Quantum Numbers Determination of the E(1420) Meson in pi- p Interactions at 3.95-GeV/c

The CERN-College de France-Madrid-Stockholm collaboration Dionisi, C. ; Gavillet, P. ; Armenteros, R. ; et al.
Nucl.Phys.B 169 (1980) 1-19, 1980.
Inspire Record 152746 DOI 10.17182/hepdata.34515

In a high statistics (90 events/μb) bubble chamber experiment, the reactions π − p→K s 0 K ± π ∓ n have been studied at 3.95 GeV/ c . A significant enhancement is observed in the ( K K π) system which we attribute to the production of the E(1420) meson. For its mass, M , and width, Λ, we find M =1426±6 MeV and Γ =40±15 MeV. The E(1420) quantum numbers are determined to be I G J P =0 + 1 + with a branching ratio E → K ∗ K + c.c E →[δπ+( K ∗ K + c.c. )]=0.86±0.12 , where δ→ K K . The cross section for the reaction π − p→En, with E→K 0 K ± π ± , is 8.2±1.0 μ b. Forward and backward productions are observed in the approximate ratio 2:1. The SU(3) assignment of the E(1420) meson is discussed.

3 data tables
Table 1

BACKGROUND SUBTRACTED.

Table 2

No description provided.

Table 3

No description provided.