Suppressing Proton Decay By Separating Quarks And Leptons

Details Suppressing Proton Decay By Separating Quarks And Leptons Suppressing Proton Decay By Separating Quarks And Leptons

2006-10-26

arxiv.org/abs/hep-ph/0610345v2

Phys.Rev.D74:127701,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, references added to match published version

Scientific paper

10.1103/PhysRevD.74.127701

Arkani-Hamed and Schmaltz (AS) have shown that proton stability need not originate from symmetries in a high energy theory. Instead the proton decay rate is suppressed if quarks and leptons are spatially separated in a compact extra dimension. This separation may be achieved by coupling five dimensional fermions to a bulk scalar field with a non-trivial vacuum profile and requires relationships between the associated quark and lepton Yukawa couplings. We hypothesise that these relationships are the manifestation of an underlying symmetry. We further show that the AS proposal may suggest that proton stability \emph{is} the result of an underlying symmetry, though not necessarily the traditional baryon number symmetry.

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