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Proton lifetime bounds from chirally symmetric lattice QCD

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Original languageEnglish
Article number054505
Number of pages14
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number5
DOIs
StatePublished - 15 Sep 2008

Abstract

We present results for the matrix elements relevant for proton decay in grand unified theories (GUTs). The calculation is performed at a fixed lattice spacing a(-1) = 1.73(3) GeV using 2 + 1 flavors of domain-wall fermions on lattices of size 16(3) x 32 and 24(3) x 64 with a fifth dimension of length 16. We use the indirect method which relies on an effective field theory description of proton decay, where we need to estimate the low-energy constants, alpha = -0.0112(25) GeV3 and beta = 0.0120(26) GeV3. We relate these low-energy constants to the proton decay matrix elements using leading order chiral perturbation theory. These can then be combined with experimental bounds on the proton lifetime to bound parameters of individual GUTs.

    Research areas

  • NUCLEON DECAY, QUANTUM CHROMODYNAMICS, WAVE-FUNCTIONS, AMPLITUDES, OPERATORS, PHYSICS

ID: 1323749