Observation ofe+e−→ρ+ρ−nears=10.58 GeV

OBSERVATION OF A SIDEREAL ANISOTROPY NEAR 1500 GeV

The underground muon flux produced by primary cosmic rays with a median rigidity of 1.5 x 10 V has been monitored to search for periodic and transient rate variations. The detector has operated at an average rate of 4.47 Hz for most of the 1.2 yr interval starting 1978 Jan 1. A peak with relative amplitude (3.8 ± 0.9) x10 -4 is observed in the Fourier transform of data at the sidereal 0.9 frequ...

Observation of plasma focusing of a 28.5 GeV positron beam.

The observation of plasma focusing of a 28.5 GeV positron beam is reported. The plasma was formed by ionizing a nitrogen jet only 3 mm thick. Simultaneous focusing in both transverse dimensions was observed with effective focusing strengths of order tesla per micron. The minimum area of the beam spot was reduced by a factor of 2.0+/-0.3 by the plasma. The longitudinal beam envelope was measured...

OBSERVATION OF RADIATIVE SPIN-POLARIZATION AT 60.6 GeV

Radiative spin-polarization has been used extensively at LEP to accurately measure the beam energy around the Z resonance. As the LEP physics has moved on to the W boson the calibration based on polarization must be extended towards higher beam energies. This is difficult as the depolarizing effects of spin resonances grow rapidly with beam energy. At LEP it has been possible for the first time...

First Observation of Coherent π 0 Production in Neutrino Nucleus Interactions with E ν < 2 GeV

The MiniBooNE experiment at Fermilab has amassed the largest sample to date of πs produced in neutral current (NC) neutrino-nucleus interactions at low energy. This paper reports a measurement of the momentum distribution of πs produced in mineral oil (CH2) and the first observation of coherent π 0 production below 2 GeV. In the forward direction, the yield of events observed above the expectat...

Observation of Xi - production in e+e- annihilation at 29 GeV.