HEPData Search

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

Table 1

No description provided.

Table 2

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Observables

CM Energies (GeV)

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Measurement of asymmetry of pi+ meson photoproduction unter large angles in the region of the first resonance

Study of a2 and a3 meson production in pi p collisions at 4.45 gev/c

Production of tritium in al, sn, pb, and bi by high energy protons

Further search for quarks at the 70 gev ihep accelerator