Experimental Investigations in Particle Physics at Intermediate Energies Preformance Report: December 1990-November 1991 (open access)

Experimental Investigations in Particle Physics at Intermediate Energies Preformance Report: December 1990-November 1991

The major elements of this project continues to be on fundamental symmetries and parameters of the Standard Model. The projects in the current period have been BNL E791 (a search for the decay K{sub L}{sup 0} {yields} {mu}e, which would violate the rule of separate lepton number conservation), test of an upgrade proposal (E871), and LSND, a neutrino experiment at LAMPF. For E791, data taking was completed in June 1990, and preliminary results are now available for the decays K{sub L}{sup 0} {yields} {mu}e and K{sub L}{sup 0} {yields} {mu}{mu}from the entire data set. The data for decay K{sub L}{sup 0} {yields} ee are still being analysed. These are an upper limit for the branching fraction for K{sub L}{sup 0} {yields} {mu}e of 3.5 {times} 10{sup {minus}11} (90% C.L.). From the 1990 data alone, we have a new (preliminary) value of the branching fraction for K{sub L}{sup 0} {yields} {mu}{mu} of (6.96{plus minus}0. 4{plus minus}0.22) {times} 10{sup {minus}9}, with a sample of 349 events. Combining this with earlier data gives (6.96{plus minus}0.34) {times} 10{sup 9}, by far the most precise value. The limit on the decay K{sub L}{sup 0} {yields} {mu}e places a lower limit on the mass of a …
Date: September 30, 1991
Creator: Auerbach, L. B.; Highland, V. L.; Martoff, C. J.; McFarlane, K. W.; Guss, C. & Kettell, S.
System: The UNT Digital Library
Experimental Investigations in Particle Physics at Intermediate Energies Preformance Report: December 1991-November 1992 (open access)

Experimental Investigations in Particle Physics at Intermediate Energies Preformance Report: December 1991-November 1992

The major emphasis of this project continues to be on fundamental symmetries and parameters of the Standard Model. A test of a quark model prediction was also done. The projects in the current period have been the following: LSND, a neutrino oscillation experiment at LAMPF; E791, a search for the decays K{sub L}{sup 0} {yields} {mu}e and K{sub L}{sup 0} {yields} ee; E871, tests and preparations for an upgrade proposal; and E888, a search for the H dibaryon. The LSND (Large Scintillator Neutrino Detector) is under construction at this time. Progress in the construction schedule has been accelerated with the expectation of being ready to accept beam in March 1993. The automated system for testing photomultiplier tubes is in full production, and should be able to certify a fun complement of tubes for installation by October 1992. Results of an earlier LAMPF experiment, E764, on the interaction of muon neutrinos with carbon nuclei have been submitted for publication. A thorough 'blind' analysis of the E791 data set has just been brought to completion. Final results for the upper limits (90% C.L.) on the branching ratios for the decays K{sub L}{sup 0} {yields} {mu}e and K{sub L}{sup 0} {yields} ee are …
Date: July 12, 1992
Creator: Auerbach, L. B.; Highland, V. L.; McFarlane, K. W. & Kettell, S. H.
System: The UNT Digital Library
Experimental Investigations in Particle Physics at Intermediate Energies Preformance Report: January-Novermber 1990 (open access)

Experimental Investigations in Particle Physics at Intermediate Energies Preformance Report: January-Novermber 1990

This paper discusses: neutrino interactions at LAMPF; parity violation in polarized ep scattering; and superconducting detector development.
Date: July 24, 1990
Creator: Auerbach, L. B.; Highland, V. L.; Martoff, C. J.; McFarlane, K. W.; Guss, C. & Kettell, S.
System: The UNT Digital Library