Introduction to E787

E787 was approved in 198x, the first engineering run was in 1988, with long data taking runs in 1989-91. The detector and beam line were upgraded from 1992-94. The upgraded detector had a short engineering run in 1994, with long data taking runs in 1995-98.

The decay K+ -> pi nu nu is very interesting because it is possible to calculate the branching ratio from fundamental Standard Model (or more) parameters (|Vtd|) very precisely. Therefore a measurement of the branching ratio gives a very clean measurement of the important and elusive |Vtd|.

The first event of this elusive decay (BR ~ 10^-10) was observed during the 1995 run of E787. E787 has continued to take data through 1998.

• E787 at Spires
• E787 Home Page
• Detector Reference: NIM A321, 129 (1992).
  • Detector Upgrade 1992-94:
    • Endcap:
      • General : IEEE NS-42, 394 (1995); Calorimetry in High Energy Physics, 103, (World Scientific, 1994)
      • PMT NIM A404, 315 (1998)
      • YAlO Light Pulsers NIM A337, 355 (1994) .
    • Drift Chamber: NIM A404, 295 (1998)
    • CCD: NIM A396, 394 (1998)