Zobrazeno 1 - 10
of 137
pro vyhledávání: '"Gavela, M. B."'
We derive the one-loop contributions to ALP-SM effective couplings, including all finite corrections. The complete leading-order -- dimension five -- effective linear Lagrangian is considered. The ALP is left off-shell, which is of particular impact
Externí odkaz:
http://arxiv.org/abs/2111.14750
Publikováno v:
Phys. Rev. Lett. 124, 051802 (2020)
We propose a new collider probe for axion-like particles (ALPs), and more generally for pseudo-Goldstone bosons: non-resonant searches which take advantage of the derivative nature of their interactions with Standard Model particles. ALPs can partici
Externí odkaz:
http://arxiv.org/abs/1905.12953
Publikováno v:
Eur.Phys.J. C79 (2019) no.5, 369
We explore the signals of axion-like particles (ALPs) in flavor-changing neutral current (FCNC) processes. The most general effective linear Lagrangian for ALP couplings to the electroweak bosonic sector is considered, and its contribution to FCNC de
Externí odkaz:
http://arxiv.org/abs/1901.02031
We present a dynamical (composite) axion model where the Peccei-Quinn (PQ) symmetry arises automatically as a consequence of chirality and gauge symmetry. The Standard Model is simply extended by a confining and chiral $SU(5)$ gauge symmetry. The PQ
Externí odkaz:
http://arxiv.org/abs/1812.08174
We determine the model-independent component of the couplings of axions to electroweak gauge bosons, induced by the minimal coupling to QCD inherent to solving the strong CP problem. The case of the invisible QCD axion is developed first, and the imp
Externí odkaz:
http://arxiv.org/abs/1811.05466
We consider an enlarged color sector which solves the strong CP problem via new massless fermions. The spontaneous breaking of a unified color group into QCD and another confining group provides a source of naturally large axion mass $m_a$ due to sma
Externí odkaz:
http://arxiv.org/abs/1805.06465
Publikováno v:
Chin. J. Phys 61 (2019) 55-71
We consider the renormalizable $SO(5)/SO(4)$ $\sigma$-model, in which the Higgs particle has a pseudo-Nambu-Goldstone boson character, and explore what the minimal field extension required to implement the Peccei-Quinn symmetry (PQ) is, within the pa
Externí odkaz:
http://arxiv.org/abs/1710.07715
We study the leading effective interactions between the Standard Model fields and a generic singlet CP-odd (pseudo)Goldstone boson. Two possible frameworks for electroweak symmetry breaking are considered: linear and non-linear. For the latter case,
Externí odkaz:
http://arxiv.org/abs/1701.05379
The minimal $SO(5)/SO(4)$ sigma model is used as a template for the ultraviolet completion of scenarios in which the Higgs particle is a low-energy remnant of some high-energy dynamics, enjoying a (pseudo) Nambu-Goldstone boson ancestry. Varying the
Externí odkaz:
http://arxiv.org/abs/1610.08083
The gauging of the lepton flavour group is considered in the Standard Model context and in its extension with three right-handed neutrinos. The anomaly cancellation conditions lead to a Seesaw mechanism as underlying dynamics for all leptons; requiri
Externí odkaz:
http://arxiv.org/abs/1609.05902