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Title: Bounds on Unparticles from the Higgs Sector

Abstract

We study supersymmetric QCD in the conformal window as a laboratory for unparticle physics, and analyze couplings between the unparticle sector and the Higgs sector. These couplings can lead to the unparticle sector being pushed away from its scale invariant fixed point. We show that this implies that low energy experiments will not be able to see unparticle physics, and the best hope of seeing unparticles is in high energy collider experiments such as the Tevatron and the LHC. We also demonstrate how the breaking of scale invariance could be observed at these experiments.

Authors:
; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. High EnergyPhysics
OSTI Identifier:
928584
Report Number(s):
LBNL-62680
R&D Project: PTHOPS; BnR: KA1401020; TRN: US0803290
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 76; Related Information: Journal Publication Date: 2007
Country of Publication:
United States
Language:
English
Subject:
72; FERMILAB TEVATRON; PHYSICS; QUANTUM CHROMODYNAMICS; SCALE INVARIANCE; SUPERSYMMETRY

Citation Formats

Fox, Patrick J., Rajaraman, Arvind, and Shirman, Yuri. Bounds on Unparticles from the Higgs Sector. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.075004.
Fox, Patrick J., Rajaraman, Arvind, & Shirman, Yuri. Bounds on Unparticles from the Higgs Sector. United States. doi:10.1103/PhysRevD.76.075004.
Fox, Patrick J., Rajaraman, Arvind, and Shirman, Yuri. Sun . "Bounds on Unparticles from the Higgs Sector". United States. doi:10.1103/PhysRevD.76.075004. https://www.osti.gov/servlets/purl/928584.
@article{osti_928584,
title = {Bounds on Unparticles from the Higgs Sector},
author = {Fox, Patrick J. and Rajaraman, Arvind and Shirman, Yuri},
abstractNote = {We study supersymmetric QCD in the conformal window as a laboratory for unparticle physics, and analyze couplings between the unparticle sector and the Higgs sector. These couplings can lead to the unparticle sector being pushed away from its scale invariant fixed point. We show that this implies that low energy experiments will not be able to see unparticle physics, and the best hope of seeing unparticles is in high energy collider experiments such as the Tevatron and the LHC. We also demonstrate how the breaking of scale invariance could be observed at these experiments.},
doi = {10.1103/PhysRevD.76.075004},
journal = {Physical Review D},
number = ,
volume = 76,
place = {United States},
year = {Sun May 20 00:00:00 EDT 2007},
month = {Sun May 20 00:00:00 EDT 2007}
}
  • We construct a model of an unparticle sector consisting of a supersymmetric SU(N) gauge theory with the number of flavors in the Seiberg conformal window. We couple this sector to the minimal supersymmetric standard model via heavy messengers. The resulting low energy theory has a Higgs coupling to unparticles. The Higgs vev drives the hidden Seiberg sector to a new conformal fixed point. The coupling to the Higgs mediates supersymmetry breaking to the Seiberg sector, and breaks conformal invariance at a lower scale. The low energy theory contains light stable and metastable mesons. Higgs decay into this sector gives signaturesmore » which are similar to those of 'hidden valley' models. Decays of the lightest superpartner of standard model particles into the hidden sector reveal potentially observable unparticle kinematics.« less
  • The authors examine the Higgs sector of the minimal supersymmetric extension of the standard model. The requirement of perturbative unification combined with the recent LEP data on Higgs boson searches, excludes substantial regions of parameter space. They find that only 0.42 {le} tan {beta} {approx lt} 0.76 and tan {beta}{approx gt} 1.30 are the allowed values for tan {beta} = {upsilon}{sub 2}/{upsilon}{sub 1}. They also determine the absolute lower bound on the lightest Higgs mass to be {approx}8 GeV. They conclude that improved lower bounds on the top quark mass and/or the standard model Higgs boson mass will impose yetmore » more stringent constraints on the model. These results clearly favor tan {beta} {gt} 1, in agreement with N = 1 supergravity or superstring-inspired models.« less
  • The implications of the LEP Higgs bounds on the MSSM stop masses and mixing are compared in two different regions of the Higgs parameter space. The first region is the Higgs decoupling limit, in which the bound on the mass of the lighter Higgs is m{sub h}{>=}114.4 GeV, and the second region is near a nondecoupling limit with m{sub h}{approx_equal}93 GeV, in which the masses of all the physical Higgs bosons are required to be light. Additional constraints from the electroweak S- and T-parameter and the decays B{yields}X{sub s}{gamma} and B{sub s}{yields}{mu}{sup +}{mu}{sup -}, which also constrain the Higgs and/ormore » stop sector, are considered. In some regions of the MSSM parameter space these additional constraints are stronger than the LEP Higgs bounds. Implications for the tuning of electroweak symmetry breaking are also discussed.« less
  • We study the effects of the one-loop matching conditions on Higgs boson and top quark masses on the triviality bounds on the Higgs boson mass using {beta}{sub {lambda}} with corrected two-loop coefficients. We obtain quite higher results than previous ones and observe that the triviality bounds are not nearly influenced by varying the top quark mass over the range measured at CDF and D0. The effects of typographical errors in {beta}{sub {lambda}}{sup (2)} and the one-loop matching condition on the top quark mass are negligible. We estimate the size of the effects on the triviality bounds from the one-loop matchingmore » condition on the Higgs boson mass. {copyright} {ital 1996 The American Physical Society.}« less
  • We examine the gauge dependence of lower bounds on the Higgs boson mass obtained from the requirement that the electroweak vacuum be the global minimum of the effective potential. We study a simple model, the spontaneously broken Abelian Higgs model coupled to a chiral quark doublet in a two-parameter R{sub {xi},u} gauge, and demonstrate that the lower bounds on the Higgs boson mass obtained in this model are dependent on the choice of gauge parameters. We discuss the significance of this result for calculations in the standard model. {copyright} {ital 1997} {ital The American Physical Society}