Experimental investigations in particle physics at intermediate energies. [Annual] performance report, December 1, 1991--November 30, 1992

Technical Report · Sun Jul 12 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/10180493· OSTI ID:10180493

Auerbach, L B; Highland, V L; McFarlane, K W; Kettell, S H

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 3.3 {times} 10{sup {minus}11} and 4.1 {times} 10{sup {minus}11}, respectively. The final result for the branching ratio for K{sub L}{sup 0} {yields} {mu}{mu} from all the data (720 events) is (7.0 {plus_minus} 0.4 {plus_minus} 0.2) {times} 10{sup {minus}9}. The potential of the E791 detector for rare K decays has reached its limit. Before disassembly it was used to mount a search (E888) for a possible long-lived six-quark state, the H. At the same time studies have been made of an upgraded version of the experiment (E871) that will make use of a portion of the existing apparatus.

• Research Organization: Temple Univ., Philadelphia, PA (United States). Dept. of Physics
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER40389
• OSTI ID: 10180493
• Report Number(s): DOE/ER/40389--75; ON: DE93000406
• Country of Publication: United States
• Language: English

Related Subjects

662210
662350
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAYS OF MESONS
ELECTRONS
EXPERIMENTAL DATA
KAONS NEUTRAL LONG-LIVED
LIQUID SCINTILLATION DETECTORS
MUONS
PERFORMANCE TESTING
PHOTOMULTIPLIERS
PROGRESS REPORT
RESEARCH PROGRAMS
UNIFIED THEORIES AND MODELS
WEAK HADRONIC DECAY