학술논문
Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System
Document Type
Working Paper
Author
KTeV Collaboration; Abouzaid, E.; Arenton, M.; Barker, A. R.; Barrio, M.; Bellantoni, L.; Blucher, E.; Bock, G. J.; Bown, C.; Cheu, E.; Coleman, R.; Corcoran, M. D.; Cox, B.; Erwin, A. R.; Escobar, C. O.; Glazov, A.; Golossanov, A.; Gomes, R. A.; Gouffon, P.; Graham, J.; Hamm, J.; Hsiung, Y. B.; Jensen, D. A.; Kessler, R.; Kotera, K.; LaDue, J.; Ledovskoy, A.; McBride, P. L.; Monnier, E.; Nguyen, H.; Niclasen, R.; Phillips II, D. G.; Prasad, V.; Qi, X. R.; Ramberg, E. J.; Ray, R. E.; Ronquest, M.; Roodman, A.; Santos, E.; Shanahan, P.; Shawhan, P. S.; Slater, W.; Smith, D.; Solomey, N.; Swallow, E. C.; Taegar, S. A.; Toale, P. A.; Tschirhart, R.; Wah, Y. W.; Wang, J.; White, H. B.; Whitmore, J.; Wilking, M. J.; Winstein, B.; Winston, R.; Worcester, E. T.; Yamanaka, T.; Zimmerman, E. D.; Zukanovich, R. F.
Source
Phys.Rev.D83:092001,2011
Subject
Language
Abstract
We present precise tests of CP and CPT symmetry based on the full dataset of K to pipi decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This dataset contains 16 million K to 2pi0 and 69 million K to pi+pi- decays. We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. We find the KL-KS mass difference Deltam = (5270 pm 12)x10^6 hbar/s and the KS lifetime tauS = (89.62 pm 0.05)x10-12 s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter, epsilon, and the superweak phase, phi_epsilon - phi_SW = (0.40 pm 0.56) degrees. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K to pi+pi- (phi+-) and for K to 2pi0 (phi00), Delta phi = (0.30 pm 0.35) degrees. From these phase measurements, we place a limit on the mass difference between K0 and K0bar, DeltaM < 4.8 x 10-19 GeV/c^2 at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.
Comment: 28 pages, 30 figures; removed extra figure
Comment: 28 pages, 30 figures; removed extra figure