K+ -> pi+ mu+ mu- in E865 at BNL
| dc.creator | Thompson, Julia A. | |
| dc.date | 1999-04-25 | |
| dc.date.accessioned | 2026-07-07T06:28:23Z | |
| dc.date.available | 2026-07-07T06:28:23Z | |
| dc.description | Preliminary values for the K+ -> pi+ mu+ mu- branching ratio and form factor are reported, based on 400 events, a factor of 2 more in total events and 100 times the present world sample of fully reconstructed events. The results are consistent with previous results on the pi+ e+ e- mode. However, the relatively large slope of the form factor in q^2, lambda = 0.182+/-0.01+/-0.007, required to fit the pi+ e+ e- data and to give consistency between the pi+ e+ e- and pi+ mu+ mu- branching ratios, is larger than expected in simple models of the decays. The K+ -> pi+ mu+ mu- branching ratio we find, (9.23 +/- 0.6 stat +/- 0.58 syst)x10^-8, is the most precise measurement of this mode and is approximately 3.2 sigma larger than the previous measurement. These pi+ l+ l- results are inconsistent with O(p^4) Chiral Perturbation Theory but compatible with O(p^6). Systematic studies for both modes are still in progress. | |
| dc.description | 5 pages, sprocl.sty, psfig.tex, 4 embedded figures. Presented at WIN '99 in Capetown, South Africa, January 1999 | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9904026 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9904026 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/97682 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | K+ -> pi+ mu+ mu- in E865 at BNL | |
| dc.type | text |