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中性K介子系统中直接CP破坏、CPT对称性和其它参数的精确测量

Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System

KTeV Collaboration, E. Abouzaid, M. Arenton, A. R. Barker, M. Barrio, L. Bellantoni, E. Blucher, G. J. Bock, C. Bown, E. Cheu, R. Coleman, M. D. Corcoran, B. Co… 展开作者

KTeV Collaboration, E. Abouzaid, M. Arenton, A. R. Barker, M. Barrio, L. Bellantoni, E. Blucher, G. J. Bock, C. Bown, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, J. Graham, J. Hamm, Y. B. Hsiung, D. A. Jensen, R. Kessler, K. Kotera, J. LaDue, A. Ledovskoy, P. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, D. G. Phillips, V. Prasad, X. R. Qi, E. J. Ramberg, R. E. Ray, M. Ronquest, A. Roodman, E. Santos, P. Shanahan, P. S. Shawhan, W. Slater, D. Smith, N. Solomey, E. C. Swallow, S. A. Taegar, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

摘要:

我们提出了精确的测试CP和CPT对称性的基础上收集的KTeV实验在费米国家加速器实验室在1996年,1997年和1999年的完整数据集的K pipi衰变。这个数据集包含1600万K到2 pi 0和6900万K到pi+pi-衰变。我们测量直接CP破坏参数Re(ε ′/ε)=(19.2 pm 2.1)x10-4。我们发现KL-KS质量差Δ m =(5270 pm 12)x10^6 hbar/s,KS寿命tauS =(89.62 pm 0.05)x10-12 s。我们还测量了几个测试CPT不变性的参数。我们找到了间接CP破坏参数的相位和超弱相位之间的差异,φ_s-φ_SW =(0.40 pm 0.56)度。我们测量了K到pi+pi-(phi+-)和K到2 pi 0(phi 00)的CP破坏和CP保存衰变振幅之间的相对相位差,Δ phi =(0.30 pm 0.35)度。根据这些相位测量,我们对K 0和K 0巴之间的质量差进行了限制,在95% C. L时,Δ M < 4.8 x 10-19 GeV/c^2。这些结果与其他实验,我们自己的早期测量和CPT对称性是一致的。

英文摘要:

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.

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