GUT breaking on the brane?

Journal Article · Wed Apr 04 04:00:00 EDT 2001 · Nuclear Physics B

OSTI ID:860772

Smith, David; Nomura, Yasunori; Weiner, Neal

We present a five-dimensional supersymmetric SU(5) theory in which the gauge symmetry is broken maximally (i.e. at the 5D Planck scale M{sub *}) on the same 4D brane where chiral matter is localized. Masses of the lightest Kaluza-Klein modes for the colored Higgs and X and Y gauge fields are determined by the compactification scale of the fifth dimension, M{sub C} {approx} 10{sup 15} GeV, rather than by M{sub *}. These fields' wave functions are repelled from the GUT-breaking brane, so that proton decay rates are suppressed below experimental limits. Above the compactification scale, the differences between the standard model gauge couplings evolve logarithmically, so that ordinary logarithmic gauge coupling unification is preserved. The maximal breaking of the grand unified group can also lead to other effects, such as O(1) deviations from SU(5) predictions of Yukawa couplings, even in models utilizing the Froggatt-Nielsen mechanism.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of High EnergyPhysics; National Science Foundation Grant PHY-95-14797
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 860772
• Report Number(s): LBNL--47677; BnR: KA1401020
• Journal Information: Nuclear Physics B, Journal Name: Nuclear Physics B Vol. 613
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPACTIFICATION
DECAY
PROTONS
STANDARD MODEL
SYMMETRY
WAVE FUNCTIONS