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Search for direct CP violation in Λ and Ξ hyperon decays

✍ Scribed by C.G. White; R.A. Burnstein; M. Carmack; A. Chakravorty; A. Chan; Y.C. Chen; W.S. Choong; K. Clark; M. Crisler; J. Drapala; E.C. Dukes; C. Durandet; J. Felix; G. Gidal; H.R. Gustafson; C. Ho; T. Holmstrom; M. Huang; C. James; M. Jenkins; D.M. Kaplan; Z. Kou; L.M. Lederman; N. Leros; M.J. Longo; F. Lopez; G. Lopez; W. Luebke; K.B. Luk; K. Nelson; V. Papavassiliou; J.P. Perroud; D. Rajaram; H.A. Rubin; N. Saleh; J. Sheng; M. Sosa; P.K. Teng; B. Turko; J. Volk; S.L. White; C. Yu; Z. Yu; P. Zyla

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
457 KB
Volume
71
Category
Article
ISSN
0920-5632

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✦ Synopsis

A sensitive search for direct CP violation in E-(E+) and A (3,) decays is underway at FNAL. Experiment E871 (HyperCP) intends to perform a precision measurement of the angular distribution of protons (anti-protons) with respect to the helicity axis in the rest frame of the A (/k). The slopes of these distributions give the decay parameters ~-=~h and c~c~,~. An asymmetry parameter ,4 in terms of these decay parameters has been defined for which a non-zero value would be unambiguous evidence for direct CP violation. Theoretical predictions for ,4 range from no asymmetry up to ,,~ 10 -3. HyperCP expects to measure ,4 with an uncertainty of ,,~ 2 x 10 -4.

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Search for CP violation in Ξ and A hyper
Search for CP violation in Ξ and A hyperon decays: Status of the HyperCP experiment
✍ Craig Dukes 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 504 KB

HyperCP (E871), a Fermilab experiment searching for CP violation in ~. and A hyperon decays, finished its first data taking run at the end of 1997, and accumulated over one billion --and -~+ decays. A sensitivity of approximately 2x10 -4 in A-A = (a=\_aA --a~a-K)/(a=\_aA + a=--aX) is expected. A non