Low Intermediate Scales for Leptogenesis in SUSY SO(10) GUTs TeX Export

@misc{citeulike:1044447, abstract = {A low intermediate scale within minimal supersymmetric SO(10) GUTs is a desirable feature to accommodate leptogenesis. We explore this possibility in models where the intermediate gauge symmetry breaks spontaneously by (a) doublet Higgs scalars and also (b) by triplets. In both scenarios gauge coupling unification requires the scale of left-right symmetry breaking (\$M\_R\$) to be close to the unification scale. This will entail unnaturally small neutrino Yukawa couplings to avoid the gravitino problem and allow successful leptogenesis. We point out that any one of three options -- threshold corrections due to the mass spectrum near the unification scale, gravity induced non-renormalizable terms near the Planck scale, or presence of additional light Higgs multiplets -- can permit unification along with much lower values of \$M\_R\$ as required for leptogenesis. In the triplet model, independent of these corrections, we find a lower bound on the intermediate scale, \$M\_R \> 10^9\$ GeV, arising from the requirement that the theory remains perturbative at least upto the GUT scale. We show that in the doublet model \$M\_R\$ can even be in the TeV region which, apart from resonant leptogenesis can be tested at LHC and ILC.}, archivePrefix = {arXiv}, author = {Majee, Swarup K. and Parida, Mina K. and Raychaudhuri, Amitava and Sarkar, Utpal}, citeulike-article-id = {1044447}, citeulike-linkout-0 = {http://arxiv.org/abs/hep-ph/0701109}, citeulike-linkout-1 = {http://arxiv.org/pdf/hep-ph/0701109}, day = {15}, eprint = {hep-ph/0701109}, keywords = {gut, leptogenesis, so10, susy}, month = {Jan}, posted-at = {2007-01-16 11:43:20}, priority = {2}, title = {Low Intermediate Scales for Leptogenesis in SUSY SO(10) GUTs}, url = {http://arxiv.org/abs/hep-ph/0701109}, year = {2007} }

TY - ELEC ID - citeulike:1044447 L3 - citeulike-article-id:1044447 N2 - A low intermediate scale within minimal supersymmetric SO(10) GUTs is a desirable feature to accommodate leptogenesis. We explore this possibility in models where the intermediate gauge symmetry breaks spontaneously by (a) doublet Higgs scalars and also (b) by triplets. In both scenarios gauge coupling unification requires the scale of left-right symmetry breaking ($M_R$) to be close to the unification scale. This will entail unnaturally small neutrino Yukawa couplings to avoid the gravitino problem and allow successful leptogenesis. We point out that any one of three options -- threshold corrections due to the mass spectrum near the unification scale, gravity induced non-renormalizable terms near the Planck scale, or presence of additional light Higgs multiplets -- can permit unification along with much lower values of $M_R$ as required for leptogenesis. In the triplet model, independent of these corrections, we find a lower bound on the intermediate scale, $M_R > 10^9$ GeV, arising from the requirement that the theory remains perturbative at least upto the GUT scale. We show that in the doublet model $M_R$ can even be in the TeV region which, apart from resonant leptogenesis can be tested at LHC and ILC. TI - Low Intermediate Scales for Leptogenesis in SUSY SO(10) GUTs KW - gut KW - leptogenesis KW - so10 KW - susy AU - Majee, Swarup AU - Parida, Mina AU - Raychaudhuri, Amitava AU - Sarkar, Utpal PY - 2007/Jan/15/ UR - http://arxiv.org/abs/hep-ph/0701109 ER -