Zobrazeno 1 - 10
of 142
pro vyhledávání: '"Gerard, Jean-Marc"'
Autor:
Buras, Andrzej J., Gerard, Jean-Marc
For direct CP-violation in $K\to\pi\pi$ decays, the usual isospin-breaking effects at the percent level are amplified by the dynamics behind the $\Delta I=1/2$ rule and conventionally encoded in $\Omega_{\rm IB}$ parameters. The updated prediction $\
Externí odkaz:
http://arxiv.org/abs/2005.08976
We present for the first time a master formula for $\varepsilon'/\varepsilon$, the ratio probing direct CP violation in $K \to \pi\pi$ decays, valid in any theory beyond the Standard Model (BSM). The formula makes use of hadronic matrix elements of B
Externí odkaz:
http://arxiv.org/abs/1807.02520
We calculate for the first time all four-quark hadronic matrix elements of local operators possibly contributing to $K\to\pi\pi$ decays and in particular to the ratio $\epsilon'/\epsilon$ beyond the Standard Model (BSM). To this end we use the Dual Q
Externí odkaz:
http://arxiv.org/abs/1807.01709
Autor:
Buras, Andrzej J., Gerard, Jean-Marc
We calculate BSM hadronic matrix elements for $K^0-\bar K^0$ mixing in the Dual QCD approach (DQCD). The ETM, SWME and RBC-UKQCD lattice collaborations find the matrix elements of the BSM density-density operators $\mathcal{O}_i$ with $i=2-5$ to be r
Externí odkaz:
http://arxiv.org/abs/1804.02401
Autor:
Buras, Andrzej, Gerard, Jean-Marc
We perform for the first time a direct calculation of on-shell $K\to\pi\pi$ hadronic matrix elements of chromomagnetic operators (CMO) in the Standard Model and beyond. To his end, we use the successful Dual QCD (DQCD) approach in which we also consi
Externí odkaz:
http://arxiv.org/abs/1803.08052
Autor:
Buras, Andrzej J., Gerard, Jean-Marc
Dispersive effects from strong $\pi\pi$ rescattering in the final state (FSI) of weak $K\to\pi\pi$ decays are revisited with the goal to have a global view on their {\it relative} importance for the $\Delta I=1/2$ rule and the ratio $\varepsilon^\pri
Externí odkaz:
http://arxiv.org/abs/1603.05686
Autor:
Buras, Andrzej J., Gerard, Jean-Marc
We demonstrate that in the large N approach developed by the authors in collaboration with Bardeen, the parameters B_6^{(1/2)} and B_8^{(3/2)} parametrizing the K\to\pi\pi matrix elements _0 and _2 of the dominant QCD and electroweak operat
Externí odkaz:
http://arxiv.org/abs/1507.06326
We review and update our results for K-> pipi decays and K^0-\bar K^0 mixing obtained by us in the 1980s within an approach based on the dual representation of QCD as a theory of weakly interacting mesons for large N colours. In our analytic approach
Externí odkaz:
http://arxiv.org/abs/1401.1385
One of the most puzzling questions in particle physics concerns the status of the baryon (B) and lepton (L) quantum numbers. On the theoretical side, most new physics scenarios naturally lead to their non-conservation and some amount of violation is
Externí odkaz:
http://arxiv.org/abs/1210.6598
A perturbative new family of fermions is now severely constrained, though not excluded yet. We reconsider the current bounds (i.e., direct and from Higgs searches, R_b, oblique parameters) on the fourth generation parameter space assuming the case of
Externí odkaz:
http://arxiv.org/abs/1204.5403