E787: a search for the rare decay K{sup +} Page: 1 of 11
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BNL-63761
Frascati Physics Series Vol. XXX (1997), pp. 000-000
HEAVY QUARKS AT FIXED TARGET - St. Goar, Oct 3rd, 1996 G E E V E D
FEB 0 6 1997
E787: A Search for the Rare Decay K+-+ 7r+yv
Steve Kettell
Brookhaven National Laboratory, Upton, NY 11786, USA
for the E787 collaboration *
ABSTRACT
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+ -+ 7r+vv
branching ratio is BR( K+ -7r+vv ) < 2.4 x 10-9. An observation of the decay
K+ -+ 7r+l+- has been made using two separate techniques. An observation of the
decay K+ -+ i+7y 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 K+-+,7r+vv decay should soon be observable. A discussion of the
expected sensitivity for K+-+,7r+v during the current running period is presented.
Possible improvements, in order to make a significant measurement of IVtdI, are
discussed. One result from the upgraded detector is a measurement of the structure
dependent part (SD+) of the decay K+-+ +vJry with a branching ratio of BR(SD+)
= (1.33 0.12 f 0.18) x 10-5.
1 Introduction T ER
The rare decay K+ -7r+vv is a flavor changing neutral current, mediated in the
standard model by heavy quark loop diagrams, and in particular, is sensitive to the
CKM matrix element jVId. The theoretical prediction for this branching ratio is
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Kettell, S. E787: a search for the rare decay K{sup +}, article, December 31, 1996; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc677568/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.