TY - JOUR
T1 - Early SU(4)PS ⊗ SU(2)L ⊗ SU(2)R ⊗ SU(2)H unification of quarks and leptons
AU - Buras, Andrzej J.
AU - Hung, P. Q.
AU - Tran, Ngoc Khanh
AU - Poschenrieder, Anton
AU - Wyszomirski, Elmar
N1 - Funding Information:
The work presented here was supported in part by DFG Project Bu. 706/1-2. P.Q.H. and N.K.T. are supported by the US Department of Energy under Grant No. DE-A505-89ER40518.
PY - 2004/11/1
Y1 - 2004/11/1
N2 - We discuss various aspects of the early petite unification (PUT) of quarks and leptons based on the gauge group GPUT = SU(4)PS ⊗ SU(2)L ⊗ SU(2)R ⊗ SU(2)H. This unification takes place at the scale M = O (1 - 2 TeV) and gives the correct value of sin2 θW(MZ2) without the violation of the upper bound on the KL → μe rate and the limits on FCNC processes. These properties require the existence of three new generations of unconventional quarks and leptons with charges up to 4/3 (for quarks) and 2 (for leptons) and masses O(250 GeV) in addition to the standard three generations of quarks and leptons. The horizontal group SU(2)H connects the standard fermions with the unconventional ones. We work out the spontaneous symmetry breaking (SSB) of the gauge group GPUT down to the SM gauge group, generalize the existing one-loop renormalization group (RG) analysis to the two-loop level including the contributions of Higgs scalars and Yukawa couplings, and demonstrate that the presence of three new generations of heavy unconventional quarks and leptons with masses O(250 GeV) is consistent with astrophysical constraints. The NLO and Higgs contributions to the RG analysis are significant while the Yukawa contributions can be neglected.
AB - We discuss various aspects of the early petite unification (PUT) of quarks and leptons based on the gauge group GPUT = SU(4)PS ⊗ SU(2)L ⊗ SU(2)R ⊗ SU(2)H. This unification takes place at the scale M = O (1 - 2 TeV) and gives the correct value of sin2 θW(MZ2) without the violation of the upper bound on the KL → μe rate and the limits on FCNC processes. These properties require the existence of three new generations of unconventional quarks and leptons with charges up to 4/3 (for quarks) and 2 (for leptons) and masses O(250 GeV) in addition to the standard three generations of quarks and leptons. The horizontal group SU(2)H connects the standard fermions with the unconventional ones. We work out the spontaneous symmetry breaking (SSB) of the gauge group GPUT down to the SM gauge group, generalize the existing one-loop renormalization group (RG) analysis to the two-loop level including the contributions of Higgs scalars and Yukawa couplings, and demonstrate that the presence of three new generations of heavy unconventional quarks and leptons with masses O(250 GeV) is consistent with astrophysical constraints. The NLO and Higgs contributions to the RG analysis are significant while the Yukawa contributions can be neglected.
UR - http://www.scopus.com/inward/record.url?scp=15344347466&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysb.2004.08.024
DO - 10.1016/j.nuclphysb.2004.08.024
M3 - Article
AN - SCOPUS:15344347466
SN - 0550-3213
VL - 699
SP - 253
EP - 291
JO - Nuclear Physics, Section B
JF - Nuclear Physics, Section B
IS - 1-2
ER -