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Observation of direct CP violation in ks, l→ΠΠ decays

  • Author(s): Alavi-Harati, A
  • Albuquerque, IF
  • Alexopoulos, T
  • Arenton, M
  • Arisaka, K
  • Averitte, S
  • Barker, AR
  • Bellantoni, L
  • Bellavance, A
  • Belz, J
  • Ben David, R
  • Bergman, DR
  • Blucher, E
  • Bock, GJ
  • Bown, C
  • Bright, S
  • Cheu, E
  • Childress, S
  • Coleman, R
  • Corcoran, MD
  • Corti, G
  • Cox, B
  • Crisler, MB
  • Erwin, AR
  • Ford, R
  • Glazov, A
  • Golossanov, A
  • Graham, G
  • Graham, J
  • Hagan, K
  • Halkiadakis, E
  • Hanagaki, K
  • Hidaka, S
  • Hsiung, YB
  • Jejer, V
  • Jennings, J
  • Jensen, DA
  • Kessler, R
  • Kobrak, HGE
  • La Due, J
  • Lath, A
  • Ledovskoy, A
  • Mc Bride, PL
  • Mc Manus, AP
  • Mikelsons, P
  • Monnier, E
  • Nakaya, T
  • Nauenberg, U
  • Nelson, KS
  • Nguyen, H
  • O’dell, V
  • Pang, M
  • Pordes, R
  • Prasad, V
  • Qiao, C
  • Quinn, B
  • Ramberg, EJ
  • Ray, RE
  • Roodman, A
  • Sadamoto, M
  • Schnetzer, S
  • Senyo, K
  • Shanahan, P
  • Shawhan, PS
  • Slater, W
  • Solomey, N
  • Somalwar, SV
  • Stone, RL
  • Suzuki, I
  • Swallow, EC
  • Swanson, RA
  • Taegar, SA
  • Tesarek, RJ
  • Thomson, GB
  • Toale, PA
  • Tripathi, A
  • Tschirhart, R
  • Wah, YW
  • Wang, J
  • White, HB
  • Whitmore, J
  • Winstein, B
  • Winston, R
  • Wu, JY
  • Yamanaka, T
  • Zimmerman, ED
  • et al.
Abstract

We have compared the decay rates of KL and KS toΠ+ Π- Π0Π0 final states using a subset of the data from the KTeV experiment (E832) at Fermilab. We find that the direct-CP-violation parameter Re (μ’/μ) is equal to [28.0±3.0(stat)±2.8(syst)]×10-4. This result definitively establishes the existence of CP violation in a decay process. © 1999 The American Physical Society.

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