TY - JOUR
T1 - Proton lifetime bounds from chirally symmetric lattice QCD
AU - Aoki,Y.
AU - Boyle,P.
AU - Cooney,P.
AU - Del Debbio,L.
AU - Kenway,R.
AU - Maynard,C. M.
AU - Soni,A.
AU - Tweedie,R.
PY - 2008/9/15
Y1 - 2008/9/15
N2 - 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.
AB - 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.
KW - NUCLEON DECAY
KW - QUANTUM CHROMODYNAMICS
KW - WAVE-FUNCTIONS
KW - AMPLITUDES
KW - OPERATORS
KW - PHYSICS
UR - http://www.scopus.com/inward/record.url?scp=52649085430&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.78.054505
DO - 10.1103/PhysRevD.78.054505
M3 - Article
VL - 78
JO - Physical Review D, Particles and fields
T2 - Physical Review D, Particles and fields
JF - Physical Review D, Particles and fields
SN - 0556-2821
IS - 5
M1 - 054505
ER -