Predictions of m(b)/m(tau) and m(t) in an asymptotically nonfree theory

dc.contributor.authorBando, M.en
dc.contributor.authorOnogi, T.en
dc.contributor.authorSato, J.en
dc.contributor.authorTakeuchi, Tatsuen
dc.contributor.departmentPhysicsen
dc.date.accessioned2016-10-18T23:49:28Zen
dc.date.available2016-10-18T23:49:28Zen
dc.date.issued1997-08-01en
dc.description.abstractWe discuss an extension of the Minimal Supersymmetric Standard Model (MSSM) with 5 generations of matter superfields. The extra generations are assumed to form a generation–mirror generation pair (the 4th and anti-4th generations) enabling the extra fermions to have SU(2)<sub>L</sub> × U(1)<sub>Y</sub> invariant masses. Due to the contribution of the extra generations, all three running gauge couplings of SU(3)<sub>C</sub> × SU(2)<sub>L</sub> × U(1)<sub>Y</sub> become asymptotically non– free while preserving gauge coupling unification at the GUT scale. We show that due to the asymptotically non–free character of the gauge couplings: (1) the top and bottom Yukawa couplings are strongly focused onto infrared fixed points as they are evolved down in scale making their values at µ = M<sub>Z</sub> insensitive to their initial values at µ = M<sub>GUT</sub>; (2) the model predicts R<sub>bτ</sub> ( MZ ) ≡ Y<sub>b</sub>/Y<sub>τ</sub> |<sub>µ=M<sub>Z</sub></sub> ≈ 1 .8, which is consistent with the experimental value provided we take the ratio of Yukawa couplings at the GUT scale to be R<sub>bτ</sub>(M<sub>GUT</sub>) = Y<sub>b</sub>/Y<sub>τ</sub> |<sub>µ=M<sub>GUT</sub></sub> = 1/3; (3) the t mass prediction comes out to be m<sub>t</sub> ≈ 180 GeV which is also consistent with experiment.en
dc.description.versionPublished versionen
dc.format.extent1589 - 1597 (9) page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1103/PhysRevD.56.1589en
dc.identifier.issn1550-7998en
dc.identifier.issue3en
dc.identifier.urihttp://hdl.handle.net/10919/73266en
dc.identifier.volume56en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1997XM77500027&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAstronomy & Astrophysicsen
dc.subjectPhysics, Particles & Fieldsen
dc.subjectPhysicsen
dc.subjectELECTROWEAK SYMMETRY-BREAKINGen
dc.subjectGRAND UNIFIED THEORIESen
dc.subjectTOP-QUARK MASSen
dc.subjectINFRARED FIXED-POINTen
dc.subjectYUKAWA UNIFICATIONen
dc.subjectSTANDARD MODELen
dc.subjectSUSY MODELen
dc.subjectCOUPLING UNIFICATIONen
dc.subjectB->S-GAMMA DECAYen
dc.subjectHEAVY FAMILIESen
dc.titlePredictions of m(b)/m(tau) and m(t) in an asymptotically nonfree theoryen
dc.title.serialPhysical Review Den
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/Physicsen

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