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Full-Text Articles in Physical Sciences and Mathematics
Yukawa Couplings And Quark And Lepton Masses In An So(10) Model With A Unified Higgs Sector, Pran Nath, Raza M. Syed
Yukawa Couplings And Quark And Lepton Masses In An So(10) Model With A Unified Higgs Sector, Pran Nath, Raza M. Syed
Pran Nath
Fermion mass generation for the third generation is considered within a unified Higgs model with a single pair of vector-spinor 144+144̅ of Higgs multiplets. Extending a previous work it is shown that much larger masses can arise for all the third generation fermions from mixing with 45 and 120 matter multiplets via the cubic couplings 16·45·144̅ and 16·120·144 in addition to the quartic couplings. Further, it is found that values of tanβ as low as 10 can allow for a b-τ-t unification consistent with the current data. The quartic and cubic couplings naturally lead to Dirac as well as Majorana …
Intermediate Mass Scale In Rank-Six Superstring Models, R. Arnowitt, Pran Nath
Intermediate Mass Scale In Rank-Six Superstring Models, R. Arnowitt, Pran Nath
Pran Nath
The current experimental lower limit on proton lifetime from the decay mode p→ν¯+K⁺ is used to obtain a limit on the intermediate mass scale in superstring-inspired models with rank-six groups. It is shown that the intermediate mass scale breaking in these models can be as low as 1×101⁴ GeV without violating current proton-decay data, provided the Yukawa couplings of superstring models are no larger than the corresponding couplings in SU(5) supergravity models. Scalar-quark masses are then larger than 1 TeV and the photino mass is no more than a few gigaelectronvolts.
Fermion Mass Generation In So(10) With A Unified Higgs Sector, K. S. Babu, Ilia Gogoladze, Pran Nath, Raza M. Syed
Fermion Mass Generation In So(10) With A Unified Higgs Sector, K. S. Babu, Ilia Gogoladze, Pran Nath, Raza M. Syed
Pran Nath
An analysis of generating fermion masses via cubic couplings in SO(10) grand unification with a unified Higgs sector is given. The new framework utilizes a single pair of vector-spinor representation 144+144̅ to break the gauge symmetry all the way to SU(3)C×U(1)em. Typically the matter-Higgs couplings in this framework are quartic and lead to naturally suppressed Yukawa couplings for the first two generations. Here we show that much larger third generation couplings naturally arise at the cubic level with additional matter in 10-plet and 45-plet representations of SO(10). Thus the physical third generation is a mixture of 16, 10, and 45-plet …