HEIDI and the unparticle

Bij, J.J. van der; Dilcher, S.

doi:10.1016/j.physletb.2007.09.004

Cited by 35 publications

(23 citation statements)

References 7 publications

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“…The situation is somewhat similar to the ideas in [11], where the singlet fields are to be conformal invariant, however the conformal invariance is here broken by the µ, ν and M terms. This is necessary in order to get a satisfactory spectrum [12].…”

Section: Introductionmentioning

confidence: 99%

New spectra in the HEIDI Higgs models

Bij

Puliçe

2011

Nuclear Physics B

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We study the so-called HEIDI models, which are renormalizable extensions of the standard model with a higher dimensional scalar singlet field. As an additional parameter we consider a higher-dimensional mixing mass parameter. This leads to enriched possibilities compared to a previous study. We find effective spectral densities of the Higgs propagator, consisting of one, two or no particle peaks, together with a continuum. We compare with the LEP-2 data and determine for which range of the model parameters the data can be described. Assuming two peaks to be present we find for the new mass scale ν ≈ 56 ± 12 GeV, largely independent of the dimension. In the limiting case of d → 6 and two peaks we find a higher dimensional coupling constant α 6 = 0.70 ± 0.18, indicative of strong interactions among the higher dimensional fields. The LHC will not be able to study this Higgs field.

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Section: Introductionmentioning

confidence: 99%

New spectra in the HEIDI Higgs models

Bij

Puliçe

2011

Nuclear Physics B

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“…Because of scale invariance, the phase space for O U resembles that of d massless particles; the salient feature of the unparticle sector is that d may take on non-integer values. Unparticle phenomenology has been investigated in a large number of recent papers [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45]. If the unparticle sector indeed appears at low energies in the form of new massless fields coupled very weakly to standard model particles, one expects that the usual stellar energy-loss limits [46,47], notably from the neutrino burst duration of SN 1987A, will provide much more restrictive limits than any laboratory experiment could achieve.…”

Section: Introductionmentioning

confidence: 99%

Unparticle constraints from supernova 1987A

2007

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The existence of an unparticle sector, weakly coupled to the standard model, would have a profound impact on supernova (SN) physics. Emission of energy into the unparticle sector from the core of SN 1987A would have significantly shortened the observed neutrino burst. The unparticle interaction with nucleons, neutrinos, electrons and muons is constrained to be so weak that it is unlikely to provide any missing-energy signature at colliders. One important exception are models where scale invariance in the hidden sector is broken by the Higgs vacuum expectation value. In this case the SN emission is suppressed by threshold effects.

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“…Triggered by this intriguing suggestion, a lot of phenomenological analysis have been done for both low and high energy processes involving unparticle operators [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,…”

Section: Introductionmentioning

confidence: 99%

Antisymmetric rank-2 tensor unparticle physics

Hur

2007

Phys. Rev. D

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We present the phenomenology of antisymmetric rank-2 tensor unparticle operator O µν U ,A with scaling dimension d U . We consider the physical effects of operator O µν U ,A in Z 0 boson invisible decays Z 0 → U , Z 0 → bb channel, the electroweak precision observable S parameter, and the muon anomalous magnetic dipole moment. The Z 0 boson invisible decay gives a very stringent constraint in the (Λ U , M U ) plane, and only small r ≡ Λ U /M U < ∼ 0.1 is favored, when Λ U is order of several 100 GeV. When the phenomenological parameter µ, which parameterizes the scale invariance breaking, goes to 0, the S parameter and the muon (g − 2) diverge for 1 < d U < 2, while for non-zero µ, there will be constraints on (Λ U , M U ) which are more stringent than those obtained from collider experiments.

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HEIDI and the unparticle

Cited by 35 publications

References 7 publications

New spectra in the HEIDI Higgs models

New spectra in the HEIDI Higgs models

Unparticle constraints from supernova 1987A

Antisymmetric rank-2 tensor unparticle physics

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