منابع مشابه
Light Hadron Weak Matrix Elements
Weak processes involving light hadrons in general, and kaons in particular, have contributed significantly to our understanding of fundamental interactions over the years. Most recently, the measurement of a non-vanishing Re ǫ/ǫ in K → ππ decays by KTeV [1] and NA48 [2] has provided unambiguous evidence for direct CP violation. In constraining the Standard Model (SM), the physics of kaons is co...
متن کاملLight Hadron Weak Matrix Elements
The kaon bag parameter BK , which is required for constraining the CP violation parameter in the Cabibbo-Kobayashi-Maskawa matrix from experiment, has been successfully calculated with the Kogut-Susskind(KS) quark action, taking advantage of its UA(1) chiral symmetry[1]. A recent systematic calculation of BK with high statistics[2], however, reveals that the systematic uncertainties in the pert...
متن کاملChiral Perturbation Theory and Weak Matrix Elements
I describe recent developments in quenched chiral perturbation theory (QChPT) and the status of weak matrix elements involving light quarks. I illustrate how, with improved statistical errors, and with calculations of the masses of baryons containing non-degenerate quarks, there is now a clear need for extrapolations of higher order than linear in the quark mass. I describe how QChPT makes pred...
متن کاملWeak Matrix Elements and K-meson Physics
Kaon Physics is a very complicated blend of Ultraviolet and Infrared effects which still defies complete physical understanding. The problem consists in the large enhancement (≈ 20) of the ∆I = 12 amplitude with respect to the ∆I = 32 one. Being a process involving hadrons, Kdecay must be treated non-perturbatively, so that lattice discretization is the ideal tool to deal with this problem. In ...
متن کاملWeak Matrix Elements for Cp Violation *
We present preliminary results of matrix elements of four fermion operators relevant to the determination of ǫ and ǫ ′ /ǫ using staggered fermions.
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ژورنال
عنوان ژورنال: International Journal of Modern Physics A
سال: 2000
ISSN: 0217-751X,1793-656X
DOI: 10.1142/s0217751x00000793