Phenomenology of epsilon_K in the top era
| dc.creator | Nierste, Ulrich | |
| dc.date | 1996-09-10 | |
| dc.date | 1996-09-16 | |
| dc.date.accessioned | 2026-07-07T09:03:20Z | |
| dc.date.available | 2026-07-07T09:03:20Z | |
| dc.description | Todays key information on the shape of the unitarity triangle is obtained from the well-measured quantity epsilon_K characterizing the CP-violation in |Delta S|=2 transitions. The phenomenological analysis requires the input of four key quantities: The magnitudes of the CKM elements V_cb and V_ub, the top quark mass and the non-perturbative parameter B_K. In the recent years all of them have been determined with increasing precision. In order to keep up with this progress the |Delta S|=2-hamiltonian had to be obtained in the next-to-leading order (NLO) of renormalization group improved perturbation theory. I present the NLO results for the QCD coefficients eta_1 and eta_3, which have been calculated by Stefan Herrlich and myself, and briefly sketch some aspects of the calculation. Then I give an update of the Unitarity Triangle using the summer 1996 data for the input parameters. The results for the improved Wolfenstein parameters rho-bar and eta-bar and the CKM phase delta are -0.21 < rho-bar < 0.22, 0.27 < eta-bar < 0.43 and 57 degrees < delta < 122 degrees. The range for the quantity sin(2 beta) entering CP asymmetries in B-decays is found as 0.46 < sin(2 beta) < 0.79. The given ranges correspond to one standard deviation in the input parameters. Finally I briefly discuss the K_L-K_S mass difference. | |
| dc.description | Talk given at the wokshop on K physics, Orsay, France, 30 May - 4 June 1996, 10 pages, LATEX2e, uses cite,subeqn,epsf,rotate,times. Two typos corrected. PostScript file now also available via anonymous ftp at ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-254-96.ps.gz | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9609310 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9609310 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/148971 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Phenomenology of epsilon_K in the top era | |
| dc.type | text |