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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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