Actividades desarrolladas actualmente por Suzuki Motor de Colombia S.A en el tema de servicio al cliente – Línea 018000 y respaldo virtual.

We have discussed the production of a neutral -wave

\

š

at the LHC or at a linear collider. If the mass of this particle is of the order of the scale of the theory, i.e. 300 GeV, it can be produced at these colliders. We have also shown that this particle as well as radial excitations of the Higgs boson and

´

boson would spoil the cancellation of the leading powers in

of in the reaction * * * È *

, thus any new particle contributing to that reaction will have a large impact already at energies well below the mass of this new particle. This reaction is thus not only of prime interest if the Higgs boson is heavy but should also be studied if the Higgs boson was light.

5.6. CONCLUSIONS 65 6.19Î 36.19 66.19 96.19 126.19Ï s2/mÐ 2 W 0 0.05 0.1 0.15 0.2 0.25 d σ / d Ω [ dimension less]

Figure 5.13: Dimensionless cross section of the reaction ъÒ

Ó ÑdÔ Ó¢Õ ÑŠÒ Ó×Ö ÑØÔ Ó including

theъÙUÚ boson. The solid line is the standard model cross section, the dotted line corresponds

to a Ñ-ÙUÚ boson of mass 350 GeV, with Û-ÜÞÝOÝ7ßà GeV and á âFãåä¬æ

Üèç#ß!éëêHìNí#îðï ã â

, the long dashed line to aÑ ÙUÚ boson of mass 500 GeV, withÛÁ܊àÝOÝ#ߓé GeV and á

â ã)ä¬æ

܊ç#ß!ñ‰ê=ìòí#îðï ã â

and the dot-dashed line to a Ñ-ÙUÚ boson of mass 800 GeV, withÛóÜdôKñFõ^ö7ß!ö GeV and á âFãåä¬æ Ü ç#ß!ÝëêHìNí#îðï ã â . 6.19÷ 46.19 86.19 126.19ø s2 /mù 2 W 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 d σ / d Ω [ dimension less]

Figure 5.14: Dimensionless cross section of the reactionÑúÒ

Ó ÑØÔ ÓûÕ ÑŠÒ ÓüÖ ÑØÔ Ó including the ý

Ú boson. The solid line is the standard model cross section, the dotted line corresponds to a

ý

Ú boson of mass 350 GeV, with ÛþÜÝ#ß!ñOà GeV and á âFÿ æ

Ü ç#ß!é

â

, the long dashed line to a

ý

Ú boson of mass 500 GeV, withÛÜ ô`ñ7ß“Ý GeV and á âFÿ

æ

Ü ç#ß!ñ

â

and the dot-dashed line to a

ъÙUÚ boson of mass 800 GeV, withÛ Ü-öFé#ß!àOö GeV and á âFÿ

æ

Ü ç#ߓÝ

â

6.19÷ 7.19÷ 8.19÷ 9.19÷ s2/mù 2 W 0.9 1 1.1 1.2 1.3 1.4 1.5 (d σ / d Ω[ d−wave])/(d σ / d Ω[ SM])

Figure 5.15: Ratio of the cross-section for the of the reaction involving the

-wave to the standard model cross-section for different values of the

-wave mass and different coupling constants. The dotted line corresponds to a

-wave of mass 350 GeV, withÛÜ#ßOé GeV and

á

â ã)ä¬æ Üç#ߓé

â

, the long dashed line to a

-wave of mass 500 GeV, with ÛWÜàOñ7ß^õ GeV and

á

â ã)ä¬æ Üûç#ß!ñ

â

and the dot-dashed line to a

-wave of mass 800 GeV, withÛÜûàOö7ôOߓç GeV and

á â ã)ä¬æ Üûç#ß“Ý â .

Chapter 6

The substructure of fermions

If the duality breaks down entirely at a certain energy scale, it is conceivable that effects from the substructure of the fermions will become manifest. We shall discuss a quite generic parametrization of the contribution of the substructure of a lepton to its anomalous magnetic moment. Assuming a mixing matrix, we can then consider radiative lepton decays that are conceivable if leptons have a substructure. The results presented in this chapter were published in [70, 71].

6.1

Anomalous magnetic moment

A new contribution to the magnetic moment of the muon can be described by adding an effective term to the Lagrangian of the standard model as follows:

Ü à á Ö! #" %$ &"(' ô*) ,+ -/. í 0 2143 (6.1) where

is the muon field,$ #"

the electromagnetic field strength, the compositeness scale

and

is a constant of order one and is probably much smaller since it parametrizes 56 -

violation. We have taken the QED one loop correction into account [72]. The leading order contribution has been considered in [70]. We have included a -term in view of a possible 56 violation of the confining interaction.

The constants in 7 depend on dynamical details of the underlying composite structure.

If the latter is analogous to QCD, where such a term is induced by the hadronic dynamics, the constant

is of the order one. One obtains the following contribution to the anomalous magnetic moment of the muon:8:9

Ü<; 0 >= ' ô?) + -@. í 0 1 ß (6.2) 67

The -term does not contribute to the anomalous magnetic moment.

The magnetic moment term (6.1) has the same chiral structure as the lepton mass term. Thus one expects that the same mechanism which leads to the small lepton masses (0

A ),

e.g. a chiral symmetry, leads to a corresponding suppression of the magnetic moment [73]. In this case the effective Lagrangian should be written as follows:

7B Ü àC 0 á ÖDE! #" %$ &"(' ô*) ,+ -@. í 0 1 ß (6.3)

The contribution of the compositeness to the magnetic moment is in this case given by8:9

Ü ; 0 = î ' ô*) ,+ -F. í 0 1 ß (6.4)