Fermilab Proposal P996 October 14, 2009 Measurement of the K + → π + ν ¯ ν Decay at Fermilab Joseph Comfort Arizona State University, Tempe, AZ Douglas Bryman, ∗ Luca Doria, Jaap Doornbos, Toshio Numao, Aleksey Sher, Dimitry Vavilov TRIUMF and University of British Columbia, Vancouver, Canada David Jaffe, Steve Kettell, Laurie Littenberg, Zhe Wang Brookhaven National Laboratory, Upton, NY Leo Bellantoni, David Christian, D. A. Jensen, Andreas Kronfeld, John Peoples Mike Syphers, Sergei Striganov, Robert Tschirhart, ∗ Herman White Fermi National Accelerator Laboratory, Batavia, IL Yuri Kudenko, Oleg Mineev, Artur Shaykhiev Institute for Nuclear Research, Moscow, Russia Roberto Carosi Istituto Nazionale di Fisica Nucleare, Pisa, Italy Ahmed Hussein University of Northern British Columbia, Prince George, Canada Jurgen Engelfried Universidad Aut´onoma de San Luis Potos´ ı, Mexico Jack Ritchie University of Texas, Austin, TX Shaomin Chen, Mingming Ding Tsinghua University, Beijing, China ∗ Contact Persons