The weak-magnetic moment of heavy quarks
نویسندگان
چکیده
منابع مشابه
The Weak-Magnetic Moment of Heavy Quarks
With initial and final particles on-shell, the anomalous weak-magnetic dipole moments of b and c quarks are electroweak gauge invariant quantities of the effective couplings Zbb̄ and Zcc̄, respectively, and good candidates to test the Standard Model and/or new physics. Here we present a complete computation of these quantities within the Standard Model. We show that decoupling properties with res...
متن کاملThe Anomalous Magnetic Moment of Quarks
In the case of massless current quarks we find that the breaking of chiral symmetry usually triggers the generation of an anomalous magnetic moment for the quarks. We show that the kernel of the Ward identity for the vector vertex yields an important contribution. We compute the anomalous magnetic moment in several quark models. The results show that it is hard to escape a measurable anomalous ...
متن کاملWeak Semileptonic Decays of Heavy Baryons Containing Two Heavy Quarks
In the heavy quark limit a heavy baryon which contains two heavy quarks is believed to be composed of a heavy diquark and a light quark. Based on this picture, we evaluate the weak semileptonic decay rates of such baryons. The transition form factors between two heavy baryons are associated with those between two heavy mesons by applying the super avor symmetry. The e ective vertices of the W-b...
متن کاملThe Contribution of Strange Quarks to the Proton Magnetic Moment
We show that from the e.m. magnetic moments of all octet baryons one cannot determine µ s p (the strange proton magnetic moment), contrarily to a result of Jido and Weise. Using the general QCD parametrization (GP) we clarify why one can, instead, obtain µ s p from the Z magnetic moment (or Sachs G Z M (0)) of the proton. This is due to the Trace terms in the GP of the magnetic moments and spec...
متن کاملAnomalous magnetic moment with heavy virtual leptons
We compute the contributions to the electron and muon anomalous magnetic moment induced by heavy leptons up to four-loop order. Asymptotic expansion is applied to obtain three analytic expansion terms which show rapid convergence. PACS numbers: 12.20.-m 14.60.Cd 14.60.Ef
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)00185-8