Observation of Direct [ital CP] Violation in K[sub S,L] [r arrow] [pi][pi] Decays

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Physical Review Letters

OSTI ID:6271999

Cheu, E; Taegar, S A; Wang, J ^[1]; Arisaka, K; Jennings, J; Slater, W; Tripathi, A ^[2]; Kobrak, H G; Swanson, R A ^[3]; Blucher, E; Bown, C; Bright, S; Glazov, A; Graham, G; Graham, J; Kessler, R; Monnier, E; Prasad, V; Qiao, C; Quinn, B ; Roodman, A; Shawhan, P S; Solomey, N; Swallow, E C; Wah, Y W; Winstein, B; Winston, R; Zimmerman, E D ^[4]; Barker, A R; LaDue, J; Mikelsons, P; Nauenberg, U; Toale, P A; Wu, J ^[5]; Swallow, E C ^[6]; Bellantoni, L; Ben-David, R; Bock, G J; Childress, S; Coleman, R; Crisler, M B

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1. University of Arizona, Tucson, Arizona 85721 (United States)
2. University of California at Los Angeles, Los Angeles, California 90095 (United States)
3. University of California at San Diego, La Jolla, California 92093 (United States)
4. The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
5. University of Colorado, Boulder, Colorado 80309 (United States)
6. Elmhurst College, Elmhurst, Illinois 60126 (United States)

We have compared the decay rates of K[sub L] and K[sub S] to [pi][sup +][pi][sup [minus]] and [pi][sup 0][pi][sup 0] final states using a subset of the data from the KTeV experiment (E832) at Fermilab. We find that the direct-[ital CP]-violation parameter Re([epsilon][sup [prime]]/[epsilon] ) is equal to [28.0[plus minus]3.0(stat)[plus minus]2. 8(syst)][times]10[sup [minus]4] . This result definitively establishes the existence of [ital CP] violation in a decay process. [copyright] [ital 1999] [ital The American Physical Society]

• OSTI ID: 6271999
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 83:1; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CONSERVATION LAWS
CP INVARIANCE
DECAY
ELEMENTARY PARTICLES
HADRONS
INVARIANCE PRINCIPLES
KAONS
MESONS
PARTICLE DECAY
PIONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES