Strong CP, Up-Quark Mass, and the Randall-Sundrum Microscope

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dc.creatorDavoudiasl, Hooman
dc.creatorSoni, Amarjit
dc.date2007-05-01
dc.date2007-08-27
dc.date.accessioned2026-07-07T10:59:52Z
dc.date.available2026-07-07T10:59:52Z
dc.descriptionIn the Randall-Sundrum model, setting the ratio of up and down quark masses $m_u/m_d << 1$, relevant to the strong CP problem, does not require chiral symmetry or fine-tuning, due to exponential bulk fermion profiles. We point out that such geometric suppression of the mass of a fermion magnifies the masses of its corresponding Kaluza-Klein (KK) states. In this sense, these KK states act as "microscopes" for probing light quark and lepton masses. In simple realizations, this hypothesis can be testable at future colliders, like the LHC, by measuring the spectrum of level-1 KK fermions. The microscope can then provide an experimental test for the vanishing of $m_u$ in the ultraviolet, independently of non-perturbative determinations, by lattice simulations or other means, at hadronic scales. We also briefly comment on application of our microscope idea to other fermions, such as the electron and neutrinos.
dc.description7 pages. New discussions and references added. Main previous conclusions unchanged
dc.identifierhttps://arxiv.org/abs/0705.0151
dc.identifierhttp://arxiv.org/abs/0705.0151
dc.identifierPhys.Rev.D76:095015,2007
dc.identifierdoi:10.1103/PhysRevD.76.095015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187555
dc.subjectHigh Energy Physics - Phenomenology
dc.titleStrong CP, Up-Quark Mass, and the Randall-Sundrum Microscope
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