K → ππ, KL-KS mass difference and the Dalitz decays of KL ∗
نویسنده
چکیده
K → ππ, KL-KS mass difference, KL → γγ and the Dalitz decays of KL are studied systematically by assuming that their amplitude can be described in terms of a sum of short distance and long distance contributions. Dominance of the short distance effect on the KL-KS mass difference will be checked by the Dalitz decays of KL in a way consistent with the K → ππ and KL → γγ decays.
منابع مشابه
Non-factorizable contributions in nonleptonic weak interactions of K mesons
K → ππ, KL-KS mass difference and KL → γγ(∗) are studied systematically by decomposing their amplitude into a sum of factorizable and nonfactorizable ones. The former is calculated by using the naive factorization while the latter is assumed to be dominated by dynamical contributions of various hadron states. Non-factorizable amplitudes for the K → ππ decays are estimated by using a hard pion a...
متن کاملContribution of sigma meson pole to K L - K S mass difference ∗
The hypothesis of σ meson pole dominance in the |∆I| = 1 2 K → ππ amplitudes is tested qualitatively by using the KL-KS mass difference. Dominance of σ-meson pole contribution in the amplitudes for the KS → ππ decays was first proposed as the origin of the well-known |∆I| = 1 2 rule in these decays [1], and recently revived in connection with the direct CP violation in the K → ππ decays [2]. If...
متن کاملThe Final Measurement of ǫ′/ǫ from KTeV
We present precise measurements of CP and CPT symmetry based on the full dataset of K → ππ decays collected by the KTeV experiment at FNAL. We measure the direct CP violation parameterRe(ǫ/ǫ) = (19.2 ±2.1) × 10. We find the KL-KS mass difference ∆m = (5265 ± 10)×10 6 h̄s and the KS lifetime τS = (89.62 ± 0.05)×10 s. We test CPT symmetry by finding the phase of the indirect CP violation parameter...
متن کاملDirect CP Violation in KL → π + π − γ
CP violation due to interference between KL and KS decays into π +π−γ is analyzed in the Standard Model. The CP-violating parameter ǫ+−γ , which is the difference between η+−γ and η+−, receives dominant contributions from K 0− K̄ mixing and the gluon penguin diagram; its magnitude is calculated to be 10−2ǫ at a typical region of the Dalitz plot. Genuine direct CP violation in KL → π+π−γ decay or...
متن کاملReview of the NA48 CP violation measurements with neutral and charged kaons
The main results on the CP violation measurements with neutral and charged kaons from the NA48 experiment at the CERN SPS are reviewed in this paper. The direct CP violating parameter Re(ε′/ε) has been measured by NA48 from the decay rates of neutral kaons into pion pairs. The final result, based on the data collected in 1997, 1998, 1999 and 2001, clearly established the existence of direct CP ...
متن کامل