Antisymmetric rank-2 tensor unparticle physics
- Department of Physics, KAIST, Daejeon 305-701 (Korea, Republic of)
- School of Physics, Korea Institute for Advanced Study, 207-43, Cheongryangri 2-dong, Dongdaemun-gu, Seoul 130-722 (Korea, Republic of)
We present the phenomenology of antisymmetric rank-2 tensor unparticle operator O{sub U,A}{sup {mu}}{sup {nu}} with scaling dimension d{sub U}. We consider the physical effects of operator O{sub U,A}{sup {mu}}{sup {nu}} in Z{sup 0} boson invisible decays Z{sup 0}{yields}U, Z{sup 0}{yields}bb channel, the electroweak precision observable S parameter, and the muon anomalous magnetic dipole moment. The Z{sup 0} boson invisible decay gives a very stringent constraint in the ({lambda}{sub U},M{sub U}) plane, and only small r{identical_to}{lambda}{sub U}/M{sub U} < or approx. 0.1 is favored, when {lambda}{sub U} is order of several 100 GeV. When the phenomenological parameter {mu}, which parameterizes the scale invariance breaking, goes to 0, the S parameter and the muon (g-2) diverge for 1<d{sub U}<2, while for nonzero {mu}, there will be constraints on ({lambda}{sub U},M{sub U}) which are more stringent than those obtained from collider experiments.
- OSTI ID:
- 21032623
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 9; Other Information: DOI: 10.1103/PhysRevD.76.096008; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Constraints on astro-unparticle physics from SN 1987A
U-boson production in e{sup +}e{sup -} annihilations, {psi} and {upsilon} decays, and light dark matter