The Production of Charged Photomesons from Deuterium and Hydrogen. I

White, R.S. ; Jacobson, M.J. ; Schulz, A.G. ;
Phys.Rev. 88 (1952) 836-850, 1952.
Inspire Record 944937 DOI 10.17182/hepdata.26456

Hydrogen and deuterium gases have been bombarded in a gas target at a temperature of 77°K and at a pressure of about 140 atmospheres by the 318±10 Mev "spread-out" bremsstrahlung photon beam of the Berkeley electron synchrotron. The charged π-mesons which were produced were collimated at angles of 45°, 90°, and 135° to the beam direction. The π+ mesons were detected with trans-stilbene scintillation crystals using πμ, πβ, and πμβ delayed coincidences and π+ and π− mesons were detected with Ilford C-2 200-micron nuclear emulsions. The ratios of the numbers of π− to π+ mesons produced in deuterium were 0.96±0.10, 1.09±0.12, and 1.21±0.17 for the angles of 45°, 90°, and 135°, respectively. No variation of the ratio with meson energy, outside statistics, was observed. Absolute values for the π+ meson energy distribution functions from hydrogen and deuterium per "equivalent quantum" have been measured at each of the above production angles. The differential and total cross sections have been obtained by integrating over energy and angle, respectively. The experimental ratios of the deuterium to hydrogen cross sections are in good agreement with the phenomenological theory of Chew and Lewis when the Hulthén deuteron function with β=6α is used in the initial state, plane waves are used for the nucleons in the final state, and the bremsstrahlung cutoff is taken into account. The statistics of the data are, however, not sufficient to determine the amount of spin interaction. The excitation functions for hydrogen and deuterium and points on the angular distribution curves in the center-of-mass system have been obtained. An upper limit of 0.08 of the charged π-meson cross section was obtained for μ-meson production from deuterium.

1 data table

No description provided.


Version 2
Investigation of the rho-meson resonance with electron-positron colliding beams

Auslander, V.L. ; Budker, G.I. ; Pakhtusova, E.V. ; et al.
Yad.Fiz. 9 (1969) 114-119, 1969.
Inspire Record 57008 DOI 10.17182/hepdata.18687

None

2 data tables

Measured value of the pion form factor

Fitted peak cross section.


Further search for quarks at the 70 gev ihep accelerator

Antipov, Yu.M. ; Bolotov, V.N. ; Devishev, M.I. ; et al.
Phys.Lett.B 30 (1969) 576-580, 1969.
Inspire Record 63242 DOI 10.17182/hepdata.28870

The results of the experiment searching for quarks with charge − 1 3 and 2 3 produced by 70 GeV protons on an aluminium target at zero angle are reported. For the selection of quarks the system of spectrometric scintillation counters, time-of-flight spectrometer, gas Cerenkov threshold counter and magnetic spectrometer with spark chambers were used. In the range of masses available at the IHEP accelerator, quarks were not found. The upper limit estimation of the differential cross-section for quark production with mass ⩽ 5 GeV /c 2− and charge −1 3 is 7×10 −38 cm 2 / ster GeV /c (with 90% confidence level). The total cross-section for quark production with charge −1 3 and mass 4.5–5 GeV /c 2 does not exceed 3×10 −39 cm 2 .

2 data tables

No description provided.

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Investigation of the phi-meson resonance by electron-positron colliding beams

Balakin, V.E. ; Budker, G.I. ; Pakhtusova, E.V. ; et al.
Phys.Lett.B 34 (1971) 328-332, 1971.
Inspire Record 69313 DOI 10.17182/hepdata.28704

Using the colliding beam machine, VEPP-2, the excitation curve of the ø-meson resonance was investigated in the three main decay modes. The resonance parameters obtained are the width, the total cross-section and the branching ratios. Namely: Γ = (4.67 ± 0.42) Mev B ( K + K − ) = (54.0 ± 3,4) % σ o = (3.96 ± 0.35) μB B ( K o s K O L ) = (25.7 ±3,0) % B ( e + e − = (2,81 ± 0.25) × 10 −4 B ( π + π − π o ) = (20.3 ± 4,2) %

2 data tables

BREIT-WIGNER FITS TO DATA POINTS AT 9 ENERGIES AROUND PHI FOR EACH CHANNEL. PEAK CROSS SECTIONS QUOTED.

PION FORM FACTOR AT PHI MASS, ALLOWING FOR POSSIBLE INTERFERENCE.


Observation of antihelium-3

Antipov, Yu.M. ; Denisov, S.P. ; Donskov, S.V. ; et al.
Nucl.Phys.B 31 (1971) 235-252, 1971.
Inspire Record 68563 DOI 10.17182/hepdata.41500

3 H̃e nuclei were observed in the negative beam, produced by 70 GeV protons on an Al target. Five 3 H̃e have been identified among 2.4 · 10 11 particles that passed through the apparatus. Scintillation and Čerenkov counters were used to measure the electrical charge and velocity of particles. The mass of 3 H̃e is found to be M 3 H ̃ e = (1.00 ± 0.03)3m p , the charge is z = (0.99 ± 0.03)2 e . The ratio of differential production cross sections of 3 H ̃ e (P = 20 GeV /c) and π − (P = 10 GeV/c ) equals 2 · 10 −11 . This corresponds to antihelium −3 production cross section d 2 σ 3 H ̃ e / d Ω d P = 2.0 · 10 −35 cm 2 / sr · GeV /c per Al nuclei and 2.2 · 10 −36 cm 2 sr · GeV/ c per nucleon.

2 data tables

No description provided.

No description provided.


Study of the reaction k- p ---> anti-k n pi at 4.2 gev/c

Tiecke, H.G.J M. ; Crijns, F.J.G H. ; Heinen, P.M. ; et al.
Nucl.Phys.B 39 (1972) 596-615, 1972.
Inspire Record 75240 DOI 10.17182/hepdata.32931

Results are presented on effective-mass distributions, differentisl cross sections and longitudinal c.m. momentum distributions for the channels K − p → K − p π o , K o p π − and K − π + n , obtained from a sample of approximately 28 000 inelastic two-pronged interactions at 4.2 GeV/ c incident momentum. The results are in satisfactory agreement with the prediction of a generalized Veneziano-model corrected for (non-dual) π -and pomeron exchange. For the channel K − pπ o pomeron exchange contributes about 20% of the cross section. In the channel K − π + n the dual, pion and pomeron contributions are responsible for resp. 15%, 65% and 20% of the total cross section.

5 data tables

BREIT-WIGNER FITS.

MEASURED OFF GRAPH.

MEASURED OFF GRAPH.

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Photoproduction of single eta-mesons on nuclei at e(gamma)=2 gev

Abramyan, L.O. ; Aganyants, Aleksandr O. ; Adamyan, F.V. ; et al.
Yad.Fiz. 18 (1973) 817-824, 1973.
Inspire Record 84598 DOI 10.17182/hepdata.18382

None

1 data table

No description provided.


Photoproduction of single pi+- mesons on nuclei at e(gamma)=2 and 3 gev. parameters of proton-neutron distribution in nuclei

Abramyan, S.R. ; Aganyants, Aleksandr O. ; Adamyan, F.V. ; et al.
Yad.Fiz. 16 (1972) 739-747, 1972.
Inspire Record 85228 DOI 10.17182/hepdata.18402

None

2 data tables

No description provided.

No description provided.


Anti-proton-nucleon scattering in deuterium below 1.0 gev/c

Caro, D.E. ; Gold, E. ; Klein, A.G. ; et al.
Nucl.Phys.B 52 (1973) 301-315, 1973.
Inspire Record 84262 DOI 10.17182/hepdata.32647

The p p and p n elastic differential cross sections have been extracted from the reaction p d→ p pn in which the deuteron breaks up. The incident antiproton momenta were 0.480, 0.735 and 0.940 GeV/ c , and the range of the momentum transfers was 0.04 < ∣ t ∣ < 0.7 (GeV/ c ) 2 . Both p p and p n differential cross sections are diffraction-like, with structure similar to the higher-momentum data.

4 data tables

No description provided.

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The inclusive single-particle spectra of pi-, K0(s) and Lambda in proton proton collisions at 19-GeV/c

The Scandinavian Bubble Chamber collaboration Boeggild, H. ; Dahl-Jensen, E. ; Hansen, K.H. ; et al.
Nucl.Phys.B 57 (1973) 77-99, 1973.
Inspire Record 84068 DOI 10.17182/hepdata.32535

Data on the inclusive production spectra of K S 0 and Λ from proton-proton collisions at 19 GeV are presented and discussed in connection with the earlier studied inclusive π − production spectrum. The three single-particle spectra are compared with a crude two-center thermal model for the average radiation from the pp collisions.

1 data table

No description provided.