Search for CP violation in charged-Xi and Lambda hyperon decays

T Holmstrom; N Leros; R A Burnstein; A Chakravorty; A Chan; Y C Chen; W S Choong; K Clark; E C Dukes; C Durandet; J Felix; Y Fu; G Gidal; P Gu; H R Gustafson; C Ho; M Huang; C James; C M Jenkins; T Jones; D M Kaplan; L M Lederman; M J Longo; F Lopez; L C Lu; W Luebke; K B Luk; K S Nelson; H K Park; J-P Perroud; D Rajaram; H A Rubin; P K Teng; J Volk; C G White; S L White; P Zyla; HyperCP Collaboration

doi:10.1103/PhysRevLett.93.262001

Search for CP violation in charged-Xi and Lambda hyperon decays

Phys Rev Lett. 2004 Dec 31;93(26 Pt 1):262001. doi: 10.1103/PhysRevLett.93.262001. Epub 2004 Dec 21.

Authors

Affiliation

¹ University of Virginia, Charlottesville, Virginia 22904, USA.

PMID: 15697968
DOI: 10.1103/PhysRevLett.93.262001

Abstract

We have compared the p and p angular distributions in 117 x 10(6) Xi- -->Lambdapi- -->ppi-pi- and 41 x 10(6) Xi+ -->Lambda pi+ -->p pi+pi+ decays using a subset of the data from the HyperCP experiment (E871) at Fermilab. We find no evidence of CP violation, with the direct-CP-violating parameter AXiLambda identical with (alphaXialphaLambda-alpha Xialpha Lambda)/(alphaXialphaLambda+alphaXialphaLambda)=[0.0+/-5.1(stat)+/-4.4(syst)] x 10(-4).