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Measurement of Proton Proton Elastic Scattering in Pure Initial Spin States at 11.75-GeV/c

Abe, K. ; Fernow, Richard C. ; Mulera, T.A. ; et al.
Phys.Lett.B 63 (1976) 239-244, 1976.
Inspire Record 114488 DOI 10.17182/hepdata.27638

The elastic cross section for proton proton scattering at 11.75 GeV/ c was measured at the Argonne ZGS using a 50% polarized target. In the range p ⊥ 2 =0.6 → 2.2 (GeV/ c ) 2 we obtained precise measurements of d σ d t(ij) for the ⇈ ⇊, and ⇅ initial spin states perpendicular to the scattering plane. We confirmed that the asymmetry parameter, A , decreases with energy in the diffraction peak, but is approximately energy-independent at large p ⊥ 2 . We found that the spin correlation parameter c nn acquires rather dramatic structure, and at large p ⊥ 2 seems to grow with energy.

1 data table
Table 1

No description provided.


Production and Decay Properties of f-prime (1514) in K- p Interactions at 4.2-GeV/c

The Amsterdam-CERN-Nijmegen-Oxford collaboration Barreiro, F. ; Diaz, J. ; Gay, J.B. ; et al.
Nucl.Phys.B 121 (1977) 237-250, 1977.
Inspire Record 111490 DOI 10.17182/hepdata.35514

Results are presented for the hypercharge exchange reaction K − p→ f ′(1514) Λ at a beam momentum of 4.15 GeV/ c . Total and differential cross sections have been determined. The Λ polarization and the tensor meson density matrix elements are given as a function of t ′.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

ALL EVENTS WITH 1.46<M(KS KS)<1.60GEV.


Polarization structure in p-p elastic scattering,

Abshire, G.W. ; Ankenbrandt, C.M. ; Crittenden, R.R. ; et al.
Phys.Rev.Lett. 32 (1974) 1261-1264, 1974.
Inspire Record 94365 DOI 10.17182/hepdata.21335

We present here the results of an experiment to study the polarization in p−p elastic scattering at the incident momenta 5.15, 7.00, and 12.33 Ge V/c, at t values ranging between - 0.5 and - 6.5 (GeV/c)2. At each momentum we observe a relative maximum in the polarization around t=−1.8 (GeV/c)2. At 12.33 GeV/c the data exhibit a double zero near t=−2.4 (GeV/c)2 and another relative maximum near t=−2.9 (GeV/c)2. The results are discussed in terms of the Chu-Hendry optical model.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Some Features of the Reaction p p --> Delta++ (1236) n at 6-GeV/c

Mountz, J.D. ; Smith, Gerald A. ; Lennox, Arlene J. ; et al.
Phys.Rev.D 12 (1975) 1211, 1975.
Inspire Record 99855 DOI 10.17182/hepdata.24861

Approximately 12 000 examples of the reaction pp→Δ++(1236)n have been identified at 6 GeV / c in a spark-chamber experiment performed at the Argonne National Laboratory Zero Gradient Synchrotron. The experimental invariant-mass and momentum-transfer-squared distributions are in agreement with predictions of the Chew-Low one-pion-exchange model, suitably modified to account for form factors or absorption. The data have been extrapolated from the physical region to the pion pole. It is found that the Dürr-Pilkuhn and Benecke-Dürr models, in conjunction with quadratic extrapolations in t, reproduce the known on-mass-shell dependence of the cross section for the elastic π+p scattering.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


The Reaction K- p --> K- pi+ n at 3.6-GeV/c

McCubbin, N.A. ; Lyons, L. ;
Nucl.Phys.B 86 (1975) 13-62, 1975.
Inspire Record 90205 DOI 10.17182/hepdata.32089

By measuring 121 000 2-prong interactions on the Oxford PEPR, we obtained 9 543 events of the type K − p → K − π + n. The cuts to improve the quality of the data and to reduce ambiguities with other final states are described in detail. Strong signals corresponding to the final states K ∗o (890)n and K ∗o (1420)n are observed. The masses and widths of these resonances are determined.

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Analysis of Two Prong Events in anti-Proton-Proton Interactions at 5.7-GeV/c

Braun, Henri ; Gerber, J.-P. ; Maurer, G. ; et al.
Nucl.Phys.B 95 (1975) 481-502, 1975.
Inspire Record 2106 DOI 10.17182/hepdata.31929

A study of elastic scattering, one-pion production and annihilation reactions in p p interactions at 5.7 GeV/ c was carried out, from the two-prong events, obtained in the hydrogen bubble chamber exposed at CERN.

2 data tables
Table 1

NUMBER OF EVENTS FOR -T<0.03 GEV**2 CALCULATED BY EXTRAPOLATION.

Table 2

No description provided.


Observation of a High-Mass Delta++ Produced in Association with K*, rho and omega

Chung, S.U. ; Protopopescu, S.D. ; Eisner, R.L. ; et al.
Phys.Lett.B 57 (1975) 384-388, 1975.
Inspire Record 98501 DOI 10.17182/hepdata.27841

Strong evidence is presented for quasi-two-body production of a π + p enhancement with mass 1881±6MeV and width 219±23MeV, recoiling off vector mesons ϱ O and ω from π + p interactions at 7.1 GeV/ c and K * o (890) from K + p interactions at 12 GeV/ c . The most probable J P assignment for this object is 7/2 + , making it a likely candidate for the Regge recurrence of Δ(1236).

2 data tables
Table 1

JACKSON FRAME.

Table 2

JACKSON FRAME.


K0(L) p --> K0(s) p Scattering in the 1.5-GeV-2.3-GeV Energy Region

Alexander, G. ; Bar-Nir, I. ; Benary, O. ; et al.
Phys.Lett.B 58 (1975) 484-488, 1975.
Inspire Record 2246 DOI 10.17182/hepdata.27761

The K L o p → K S o p differential and total cross-section and the forward scattering amplitude phase φ have been measured in the 1.5 to 2.3 GeV centre of mass energy range. The data is compared with predictions based on recent K ± N phase shift solutions. Best agreement is found for K + N solutions which do not warrant an I=0 P 1 2 exotic Z ∗ o (1800) baryon.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Small-Angle pi- p Elastic Scattering Measurements

Apokin, V.D. ; Derevshchikov, A.A. ; Matulenko, Yu.A. ; et al.
Phys.Lett.B 56 (1975) 391-394, 1975.
Inspire Record 90800 DOI 10.17182/hepdata.27866

We have measured small angle elastic pion-proton scattering in 40 and 50 GeV c π − beams at Serpukhov. Analysis of the data in the Coulomb interference region yields a value for the ratio of the real to the imaginary part of the strong amplitude, ϱ (0)=−0.074 ± 0.033 at 40 GeV/ c and ϱ (0)=−0.006 ±0.026 at 50 GeV/ c

2 data tables
Table 1

STATISTICAL ERRORS ONLY.

Table 2

STATISTICAL ERRORS ONLY.


New Evidence for K* (1780) Production

Spiro, M. ; Barloutaud, R. ; Borg, A. ; et al.
Phys.Lett.B 60 (1976) 389-392, 1976.
Inspire Record 100448 DOI 10.17182/hepdata.27754

We present the first evidence for K ∗ (1780) production in a non-exchange channel. This comes from a study of the reaction K − p → K° π − p at 14.3 GeV/ c . We also present evidence for K ∗ ° (1780) production in the charge exchange channel K − p → K − π + n. No significant K ππ , K ω and K η decay modes are found. The decay angular distribution, the spin-parity assignments and the production mechanism are discussed. With plausible assumptions on the production mechanism, the J P = 3 − spin-parity is favoured.

1 data table
Table 1

No description provided.