Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Ametller, Ll."'
We re-examine lepton flavor violation (LFV) in the Littlest Higgs model with T--parity (LHT) including the full T--odd (non-singlet) lepton and Goldstone sectors. The heavy leptons induce two independent sources of LFV associated with the couplings n
Externí odkaz:
http://arxiv.org/abs/1901.07058
We calculate loop induced lepton flavor violating Higgs decays in the Littlest Higgs model with T-parity. We find that a finite amplitude is obtained only when all contributions from the T-odd lepton sector are included. This is in contrast to lepton
Externí odkaz:
http://arxiv.org/abs/1705.08827
Autor:
Ametller, Ll., Talavera, P.
We discuss the two photon coupling of the lightest scalar meson on the basis of an extension of $\chi$PT. Using low energy data on the pion form-factor and the $\gamma\gamma\to \pi^+\pi^-(\pi^0\pi^0)$ cross-sections as inputs, we find $\Gamma(\sigma\
Externí odkaz:
http://arxiv.org/abs/1504.06505
The large cross sections for gauge boson production at the Fermilab Tevatron and the CERN Large Hadron Collider (LHC) might give a chance to determine the electroweak parameters with high precision. We calculated two different forward-backward charge
Externí odkaz:
http://arxiv.org/abs/hep-ph/0511243
Publikováno v:
Phys.Lett. B628 (2005) 40-48
We consider the next-to-leading order corrections, O(alpha_s), to forward-backward charge asymmetries for lepton-pair production in association with a large transverse momentum jet at large hadron colliders. We find that the leading order results are
Externí odkaz:
http://arxiv.org/abs/hep-ph/0507262
Publikováno v:
Phys.Rev.Lett. 89 (2002) 161802
We discuss forward-backward charge asymmetries for lepton pair production in association with a large transverse momentum jet at hadron colliders. The measurement of the lepton charge asymmetry relative to the jet direction A_{FB}^j gives a new deter
Externí odkaz:
http://arxiv.org/abs/hep-ph/0206160
Publikováno v:
Phys.Rev. D64 (2001) 094009
The amplitude for the anomalous transitions gamma pi(+) -> pi(0) pi(+) is analyzed within Chiral Perturbation Theory including electromagnetic interactions. The presence of a t-channel one-photon exchange contribution induces sizeable e^2 corrections
Externí odkaz:
http://arxiv.org/abs/hep-ph/0107127
Publikováno v:
Phys.Lett. B462 (1999) 310-318
Associated single top production with a Z boson or a photon at large hadron colliders provides a precise determination of top flavour-changing neutral couplings. The best way to measure these couplings with the up quark at Tevatron is to search for e
Externí odkaz:
http://arxiv.org/abs/hep-ph/9906462
Publikováno v:
Phys. Rev. D 60, 094003 (1999)
The processes $\gamma\gamma\to\pi^0\pi^0\pi^0$ and $\gamma\gamma\to \pi^+ \pi^- \pi^0$ are considered in Generalized Chiral Perturbation theory, in view of their potential sensitivity to the mechanism of spontaneous breaking of chiral symmetry and to
Externí odkaz:
http://arxiv.org/abs/hep-ph/9904452
Publikováno v:
Phys.Lett. B400 (1997) 370-378
The process eta -> pi0 pi0 gamma gamma is discussed in Chiral Perturbation Theory (ChPT) extending two recent analyses. Special attention is devoted to one-loop corrections, eta-eta' mixing effects and vector-meson dominance of ChPT counter-terms. Th
Externí odkaz:
http://arxiv.org/abs/hep-ph/9702302