Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1997-01-09
Physics
High Energy Physics
High Energy Physics - Experiment
12 pages with 5 figures. To appear in the proceedings of HQ96
Scientific paper
Recent results from the first phase of the E787 experiment and an update on the current status are presented. From the first phase the limit on the K+ -> pi+ nu nu (pnn) branching ratio is BR(pnn) < 2.4e-9 (90%CL). An observation of the decay K+ -> pi+ mu mu has been made using two separate techniques. An observation of the decay K+ -> pi+ gamma gamma has been made and the distribution of two photon invariant mass is inconsistent with phase space but consistent with chiral perturbation theory. A description of recent upgrades to the detector follows. With the upgraded detector the pnn decay should soon be observable. A discussion of the expected sensitivity for pnn during the current running period is presented. Possible improvements, in order to make a significant measurement of |Vtd|, are discussed. One result from the upgraded detector is a measurement of the structure dependent part (SD+) of the decay K+ -> mu+ nu gamma with a branching ratio of BR(SD+) = (1.33 +/- 0.12 +/- 0.18)e-5.
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