HEPData Search

Showing 10 of 498 results

Production of $\rho^0$ and $F^0$ in 4 GeV $\pi+D$ interactions

Charlesworth, J.A. ; Sekulin, R.L. ; Emms, M.J. ; et al.

AIP Conf.Proc. 13 (1973) 317-321, 1973.

Inspire Record 83445 DOI 10.17182/hepdata.32392

We have applied the Estabrooks and Martin analysis to a sample of 5279 events produced in the reactionπ+n ⇒ pρ0, and have made a density matrix study, including a positivity analysis, of theJ = 0, 1, 2density matrix in the f0 region, using a sample of 2385 events.

4 data tables

Table 1

S-CHANNEL MOMENTS.

Table 2

T-CHANNEL MOMENTS.

Table 3

S-CHANNEL FRAME.

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A20 Production by Charge Exchange in pi+ n Interactions at 4-GeV/c

Emms, M.J. ; Jones, G.T. ; Kinson, J.B. ; et al.

Phys.Lett.B 58 (1975) 117-120, 1975.

Inspire Record 98783 DOI 10.17182/hepdata.27809

A partial wave analysis of the reaction π + n → π + π − π 0 p yields an A 0 2 production cross section of 225 ± 30μb for momentum transfer squared < 1 (GeV/ c ) 2 ; the differential cross-section and density matrix are presented and compared with ω 0 production in the light of theoretical models.

2 data tables

Table 1

Axis error includes +- 10/10 contribution.

Table 2

ASSUMING NO POPULATION OF HELICITY 2 DENSITY MATRIX ELEMENTS IN T-CHANNEL FRAME. THIS MM = 1+, 1-, 2+, 2- NOTATION REFERS TO THAT SUM OR DIFFERENCE OF HELICITY M DENSITY MATRIX ELEMENTS CORRESPONDING ASYMPTOTICALLY TO NATURAL (+) OR UNNATURAL (-) PARITY EXCHANGE.

The Production of the Omega0 Meson in the Reaction pi+ d --> p (Spectator) p Omega0 at 4-GeV/c

Emms, M.J. ; Kinson, J.B. ; Stacey, B.J. ; et al.

Nucl.Phys.B 98 (1975) 1-28, 1975.

Inspire Record 100077 DOI 10.17182/hepdata.31856

The reaction π + n → ω 0 p has been studied at 4 GeV/ c giving a total cross section of 313 ± 26 μ b. The sample of about 3500 ω 0 events produced in the forward direction has been used to determine the differential cross section and the spin density matrix elements. The effective trajectory for unnatural parity exchange has been determined by a comparison of ϱ 00 d σ /d t at different energies. A comparison of ϱ 00 d σ /d t has been made with the similar data for ϱ 0 production in this experiment allowing π-B exchange degeneracy and ϱ-ω interference to be investigated. These methods result in an unnatural trajectory consistent with that expected for the B-meson. A further study of ϱ-ω interference has been made by comparing the reactions π + n → ω 0 p and π − p → ω 0 n at similar energies. Our results on ω and ϱ production are combined with data on K ∗0 and K ∗0 production at 4 GeV/ c and an SU(3) sum rule relating the production of these four mesons is shown to be satisfied.

13 data tables

Table 1

ASSUMING PREDOMINANTLY NUCLEON SPIN FLIP.

Table 2

No description provided.

Table 3

No description provided.

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CROSS-SECTIONS FOR STRANGE PARTICLE PRODUCTION IN pi+ d INTERACTIONS AT 4-GeV/c

Emms, M.J. ; Kinson, J.B. ; Stacey, B.J. ; et al.

Nucl.Phys.B 145 (1978) 285-304, 1978.

Inspire Record 131111 DOI 10.17182/hepdata.34882

The production of strange particles in π + d interactions has been examined at 4 GeV/ c where no previous data exist. Careful attention has been given to the resolution of ambiguities and to corrections for losses in a total sample of about 22 000 events which have been used to determine channel cross sections. Where they can be checked, the cross sections fit well into the observed variation of existing cross sections at higher and at lower energies.

1 data table

Table 1

No description provided.

Hadron Production at Transverse Momenta From 0.5-{GeV} Up to 2.2-{GeV}/c in Proton Proton Collisions at 70-{GeV}

Abramov, V.V. ; Alekseev, A.V. ; Baldin, B.Yu. ; et al.

Sov.J.Nucl.Phys. 31 (1980) 484, 1980.

Inspire Record 143797 DOI 10.17182/hepdata.34474

The cross sections for π ± , K ± , p, and p production in pp collisions have been measured at transverse momenta from 0.48 up to 2.21 GeV/ c at 70 GeV. The data are compared with results obtained at lower and higher proton energies and also with the quantum chromodynamics parton model (QPM) calculations. Common behaviour of the cross sections of the form g(p ⊥ )⨍(x ⊥ ) in the energy range above 200 GeV does not take place at lower energies. Qualitatively QPM fits the data and the best agreement is for π + / π − and K + / π + ratios.

7 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.