Muminov, M.M.
DSIG/DT
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STUDY OF DIFFRACTION DISSOCIATION AND DOUBLE RESONANCE PRODUCTION IN THE FINAL STATE ANTI-P P PI+ PI- AT 7.2-GEV/C

Van Apeldoorn, G.W. ; Harting, D. ; Holthuizen, D.J. ; et al.
Nucl.Phys.B 156 (1979) 111-125, 1979.
Inspire Record 146767 DOI 10.17182/hepdata.34665

On 8 K events of the reaction p p π + π − at 7.23 GeV/ c simple selection on angular parameters is performed yielding a sample of events with the typical features of diffraction dissociation. A cross section of 1.22 ± 0.08 mb (in two vertices) and a slope of the t distribution of 12.6 ± 1.0 GeV −2 for − t < 0.1 GeV 2 are obtained for the diffraction fraction dissociation p → p π + π − + c.c. Using an analogous selection procedure, another sample of events is isolated that is characterized by double resonance production. Cross sections for Δ Δ and Δ Δ ′ + c.c. production amount to 1.27 ± 0.09 mb and 0.23 ± 0.07 mb respectively. Diffraction dissociation and double resonance production together make up for 87% of the total cross section for the reaction p p → p p π + π − , which is 3.11 ± 0.13 mb.

3 data tables
Table 1

No description provided.

Table 2

EXPONENTIAL FIT TO D(SIG)/DT IN THREE REGIONS OF T. FOR EVENTS WITH M(P PI+) AND M(AP PI-) < 1.4 GEV.

Table 3

No description provided.


Photoproduction of rho0 and rho- Mesons at 3-GeV

Bapu, P. ; Endorf, R. ; Meadows, B. ; et al.
Phys.Rev.D 15 (1977) 26, 1977.
Inspire Record 123802 DOI 10.17182/hepdata.24621

The photoproduction of ρ0 and ρ− mesons has been studied at 3 GeV in the reactions γd→dπ±π−, γd→psnπ+π−, and γd→pspπ−π0. For ρ0 and ρ− production in these reactions we present the total and differential cross sections, the decay angular distributions, and the spin density matrix elements. The photoproduction of the ρ0 is found to be consistent with s-channel helicity conservation and is dominated by natural-parity exchange. The ρ− meson production has approximately equal natural- and unnatural-parity-exchange contributions. The unnatural-parity-exchange contribution is consistent with one-pion exchange and is used to estimate the value of Γρπγ.

6 data tables
Table 1

No description provided.

Table 2

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Table 3

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Photoproduction of Single Charged Pions from Deuterium and Hydrogen

Bar-Yam, Z. ; de Pagter, J. ; Hoenig, M.M. ; et al.
Phys.Rev.Lett. 19 (1967) 40-42, 1967.
Inspire Record 52325 DOI 10.17182/hepdata.21751

Differential cross sections for the photoproduction of single charged pions from deuterium and hydrogen have been measured at pion center-of-mass angles between 30° and 90° and at photon energies between 3.0 and 3.7 GeV. The ratio of π− to π+ cross sections from deuterium is found to be appreciably smaller than 1.

4 data tables
Table 1

No description provided.

Table 2

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Table 3

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